1473 lines
40 KiB
C
1473 lines
40 KiB
C
#include "curve-editor.h"
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#include <gtk/gtk.h>
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/* Set q to the projection of p onto the line through a and b */
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static void
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closest_point (const graphene_point_t *p,
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const graphene_point_t *a,
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const graphene_point_t *b,
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graphene_point_t *q)
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{
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graphene_vec2_t n;
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graphene_vec2_t ap;
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float t;
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graphene_vec2_init (&n, b->x - a->x, b->y - a->y);
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graphene_vec2_init (&ap, p->x - a->x, p->y - a->y);
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t = graphene_vec2_dot (&ap, &n) / graphene_vec2_dot (&n, &n);
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q->x = a->x + t * (b->x - a->x);
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q->y = a->y + t * (b->y - a->y);
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}
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/* Determine if p is on the line through a and b */
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static gboolean
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collinear (const graphene_point_t *p,
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const graphene_point_t *a,
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const graphene_point_t *b)
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{
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graphene_point_t q;
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closest_point (p, a, b, &q);
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return graphene_point_near (p, &q, 0.0001);
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}
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/* Set q to the point on the line through p and a that is
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* at a distance of d from p, on the opposite side
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*/
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static void
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opposite_point (const graphene_point_t *p,
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const graphene_point_t *a,
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float d,
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graphene_point_t *q)
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{
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graphene_vec2_t ap;
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float t;
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graphene_vec2_init (&ap, p->x - a->x, p->y - a->y);
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t = - sqrt (d * d / graphene_vec2_dot (&ap, &ap));
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q->x = p->x + t * (a->x - p->x);
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q->y = p->y + t * (a->y - p->y);
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}
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#define DRAW_RADIUS 5
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#define CLICK_RADIUS 8
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typedef enum
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{
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MOVE,
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LINE,
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CURVE
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} Operation;
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static const char *
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op_to_string (Operation op)
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{
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switch (op)
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{
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case MOVE:
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return "move";
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case LINE:
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return "line";
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case CURVE:
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return "curve";
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default:
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g_assert_not_reached ();
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}
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}
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static Operation
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op_from_string (const char *s)
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{
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if (strcmp (s, "move") == 0)
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return MOVE;
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else if (strcmp (s, "line") == 0)
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return LINE;
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else if (strcmp (s, "curve") == 0)
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return CURVE;
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else
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g_assert_not_reached ();
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}
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typedef struct
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{
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Operation op;
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gboolean edit;
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gboolean smooth;
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gboolean symmetric;
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} PointData;
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struct _CurveEditor
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{
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GtkWidget parent_instance;
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graphene_point_t *points;
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int n_points;
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PointData *point_data; /* length is n_points / 3 */
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int dragged;
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int hovered;
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int context;
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gboolean edit;
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GtkWidget *menu;
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GActionMap *actions;
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};
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struct _CurveEditorClass
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{
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GtkWidgetClass parent_class;
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};
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G_DEFINE_TYPE (CurveEditor, curve_editor, GTK_TYPE_WIDGET)
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static gboolean
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point_is_visible (CurveEditor *self,
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int point)
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{
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g_assert (0 <= point && point < self->n_points);
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if (!self->edit)
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return FALSE;
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switch (point % 3)
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{
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case 0: /* point on curve */
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return TRUE;
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case 1:
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if (!self->point_data[point / 3].edit)
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return FALSE;
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else
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return self->point_data[point / 3].op == CURVE;
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case 2:
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if (!self->point_data[((point + 1) % self->n_points) / 3].edit)
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return FALSE;
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else
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return self->point_data[point / 3].op == CURVE;
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default:
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g_assert_not_reached ();
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}
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}
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static void
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drag_begin (GtkGestureDrag *gesture,
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double start_x,
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double start_y,
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CurveEditor *self)
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{
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int i;
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graphene_point_t p = GRAPHENE_POINT_INIT (start_x, start_y);
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if (self->edit)
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for (i = 0; i < self->n_points; i++)
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{
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if (graphene_point_distance (&self->points[i], &p, NULL, NULL) < CLICK_RADIUS)
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{
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if (point_is_visible (self, i))
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{
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self->dragged = i;
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gtk_widget_queue_draw (GTK_WIDGET (self));
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}
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return;
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}
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}
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gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_DENIED);
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}
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static void
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drag_update (GtkGestureDrag *gesture,
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double offset_x,
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double offset_y,
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CurveEditor *self)
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{
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double x, y;
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double dx, dy;
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graphene_point_t *c, *p, *d;
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double l1, l2;
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if (self->dragged == -1)
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return;
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gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
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gtk_gesture_drag_get_start_point (gesture, &x, &y);
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x += offset_x;
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y += offset_y;
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d = &self->points[self->dragged];
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/* before moving the point, record the distances to its neighbors, since
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* we may want to preserve those
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*/
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c = &self->points[(self->dragged - 1 + self->n_points) % self->n_points];
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l1 = graphene_point_distance (d, c, NULL, NULL);
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c = &self->points[(self->dragged + 1) % self->n_points];
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l2 = graphene_point_distance (d, c, NULL, NULL);
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dx = x - d->x;
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dy = y - d->y;
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if (self->dragged % 3 == 0)
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{
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/* dragged point is on curve */
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Operation op, op1, op2;
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/* first move the point itself */
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d->x = x;
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d->y = y;
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/* adjust control points as needed */
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op = self->point_data[self->dragged / 3].op;
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op1 = self->point_data[((self->dragged - 1 + self->n_points) % self->n_points) / 3].op;
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if (op1 == LINE)
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{
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/* the other endpoint of the line */
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p = &self->points[(self->dragged - 3 + self->n_points) % self->n_points];
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if (op == CURVE && self->point_data[self->dragged / 3].smooth)
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{
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/* adjust the control point after the line segment */
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c = &self->points[(self->dragged + 1) % self->n_points];
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opposite_point (d, p, l2, c);
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}
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else
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{
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c = &self->points[(self->dragged + 1) % self->n_points];
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c->x += dx;
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c->y += dy;
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}
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c = &self->points[(self->dragged - 1 + self->n_points) % self->n_points];
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c->x += dx;
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c->y += dy;
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op2 = self->point_data[((self->dragged - 4 + self->n_points) % self->n_points) / 3].op;
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if (op2 == CURVE && self->point_data[((self->dragged - 3 + self->n_points) % self->n_points) / 3].smooth)
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{
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double l;
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/* adjust the control point before the line segment */
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c = &self->points[((self->dragged - 4 + self->n_points) % self->n_points)];
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l = graphene_point_distance (c, p, NULL, NULL);
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opposite_point (p, d, l, c);
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}
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}
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if (op == LINE)
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{
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/* the other endpoint of the line */
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p = &self->points[(self->dragged + 3) % self->n_points];
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if (op1 == CURVE && self->point_data[self->dragged / 3].smooth)
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{
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/* adjust the control point before the line segment */
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c = &self->points[(self->dragged - 1 + self->n_points) % self->n_points];
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opposite_point (d, p, l1, c);
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}
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else
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{
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c = &self->points[(self->dragged -1 + self->n_points) % self->n_points];
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c->x += dx;
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c->y += dy;
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}
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c = &self->points[(self->dragged + 1) % self->n_points];
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c->x += dx;
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c->y += dy;
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op2 = self->point_data[((self->dragged + 3) % self->n_points) / 3].op;
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if (op2 == CURVE && self->point_data[((self->dragged + 3) % self->n_points) / 3].smooth)
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{
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double l;
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/* adjust the control point after the line segment */
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c = &self->points[((self->dragged + 4) % self->n_points)];
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l = graphene_point_distance (c, p, NULL, NULL);
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opposite_point (p, d, l, c);
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}
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}
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if (op1 != LINE && op != LINE)
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{
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self->points[(self->dragged - 1 + self->n_points) % self->n_points].x += dx;
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self->points[(self->dragged - 1 + self->n_points) % self->n_points].y += dy;
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self->points[(self->dragged + 1) % self->n_points].x += dx;
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self->points[(self->dragged + 1) % self->n_points].y += dy;
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}
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}
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else
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{
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/* dragged point is a control point */
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int point;
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graphene_point_t *p1;
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Operation op, op1;
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if (self->dragged % 3 == 1)
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{
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point = (self->dragged - 1 + self->n_points) % self->n_points;
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c = &self->points[(self->dragged - 2 + self->n_points) % self->n_points];
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p = &self->points[point];
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op = self->point_data[point / 3].op;
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op1 = self->point_data[((self->dragged - 4 + self->n_points) % self->n_points) / 3].op;
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p1 = &self->points[(self->dragged - 4 + self->n_points) % self->n_points];
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}
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else if (self->dragged % 3 == 2)
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{
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point = (self->dragged + 1) % self->n_points;
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c = &self->points[(self->dragged + 2) % self->n_points];
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p = &self->points[point];
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op = self->point_data[self->dragged / 3].op;
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op1 = self->point_data[point / 3].op;
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p1 = &self->points[(self->dragged + 4) % self->n_points];
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}
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else
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g_assert_not_reached ();
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if (op == CURVE && self->point_data[point / 3].smooth)
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{
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if (op1 == CURVE)
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{
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double l;
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/* first move the point itself */
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d->x = x;
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d->y = y;
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/* then adjust the other control point */
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if (self->point_data[point / 3].symmetric)
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l = graphene_point_distance (d, p, NULL, NULL);
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else
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l = graphene_point_distance (c, p, NULL, NULL);
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opposite_point (p, d, l, c);
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}
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else if (op1 == LINE)
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{
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graphene_point_t m = GRAPHENE_POINT_INIT (x, y);
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closest_point (&m, p, p1, d);
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}
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else
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{
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d->x = x;
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d->y = y;
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}
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}
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else
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{
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d->x = x;
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d->y = y;
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}
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}
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gtk_widget_queue_draw (GTK_WIDGET (self));
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}
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static void
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drag_end (GtkGestureDrag *gesture,
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double offset_x,
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double offset_y,
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CurveEditor *self)
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{
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drag_update (gesture, offset_x, offset_y, self);
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self->dragged = -1;
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}
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static void
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maintain_smoothness (CurveEditor *self,
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int point)
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{
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gboolean smooth;
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Operation op, op1;
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smooth = self->point_data[point / 3].smooth;
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op = self->point_data[point / 3].op;
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op1 = self->point_data[((point - 1 + self->n_points) % self->n_points) / 3].op;
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if (smooth)
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{
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graphene_point_t *p;
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p = &self->points[point];
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if (op == CURVE && op1 == CURVE)
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{
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graphene_point_t *c, *c2;
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float d;
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c = &self->points[(point - 1 + self->n_points) % self->n_points];
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c2 = &self->points[(point + 1) % self->n_points];
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d = graphene_point_distance (c, p, NULL, NULL);
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opposite_point (p, c2, d, c);
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}
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else if (op == CURVE && op1 == LINE)
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{
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graphene_point_t *c, *p2;
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float d;
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c = &self->points[(point + 1) % self->n_points];
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p2 = &self->points[(point - 3 + self->n_points) % self->n_points];
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d = graphene_point_distance (c, p, NULL, NULL);
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opposite_point (p, p2, d, c);
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}
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else if (op == LINE && op1 == CURVE)
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{
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graphene_point_t *c, *p2;
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float d;
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c = &self->points[(point - 1 + self->n_points) % self->n_points];
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p2 = &self->points[(point + 3) % self->n_points];
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d = graphene_point_distance (c, p, NULL, NULL);
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opposite_point (p, p2, d, c);
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}
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}
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}
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static void
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set_smooth (GSimpleAction *action,
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GVariant *value,
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gpointer data)
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{
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CurveEditor *self = CURVE_EDITOR (data);
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self->point_data[self->context / 3].smooth = g_variant_get_boolean (value);
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maintain_smoothness (self, self->context);
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gtk_widget_queue_draw (GTK_WIDGET (self));
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}
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static void
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set_symmetric (GSimpleAction *action,
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GVariant *value,
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gpointer data)
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{
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CurveEditor *self = CURVE_EDITOR (data);
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self->point_data[self->context / 3].symmetric = g_variant_get_boolean (value);
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maintain_smoothness (self, self->context);
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gtk_widget_queue_draw (GTK_WIDGET (self));
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}
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static void
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set_operation (GSimpleAction *action,
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GVariant *value,
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gpointer data)
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{
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CurveEditor *self = CURVE_EDITOR (data);
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self->point_data[self->context / 3].op = op_from_string (g_variant_get_string (value, NULL));
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maintain_smoothness (self, self->context);
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maintain_smoothness (self, (self->context + 3) % self->n_points);
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gtk_widget_queue_draw (GTK_WIDGET (self));
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}
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static void
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remove_point (GSimpleAction *action,
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GVariant *value,
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gpointer data)
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{
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CurveEditor *self = CURVE_EDITOR (data);
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int i;
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for (i = self->context / 3; i + 1 < self->n_points / 3; i++)
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self->point_data[i] = self->point_data[i + 1];
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self->point_data = g_realloc (self->point_data, sizeof (PointData) * (self->n_points / 3 - 1));
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self->points[(self->context - 1 + self->n_points) % self->n_points] = self->points[self->context + 2];
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for (i = self->context; i + 3 < self->n_points; i++)
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self->points[i] = self->points[i + 3];
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self->points = g_realloc (self->points, sizeof (graphene_point_t) * (self->n_points - 3));
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self->n_points -= 3;
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}
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static void
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find_line_point (graphene_point_t *a,
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graphene_point_t *b,
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graphene_point_t *p,
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double *t,
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graphene_point_t *pp,
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double *d)
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{
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graphene_vec2_t n;
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graphene_vec2_t ap;
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float tt;
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graphene_vec2_init (&n, b->x - a->x, b->y - a->y);
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graphene_vec2_init (&ap, p->x - a->x, p->y - a->y);
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tt = graphene_vec2_dot (&ap, &n) / graphene_vec2_dot (&n, &n);
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if (tt < 0)
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{
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*pp = *a;
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*t = 0;
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*d = graphene_point_distance (a, p, NULL, NULL);
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}
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else if (tt > 1)
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{
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*pp = *b;
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*t = 1;
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*d = graphene_point_distance (b, p, NULL, NULL);
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}
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else
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{
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pp->x = a->x + tt * (b->x - a->x);
|
|
pp->y = a->y + tt * (b->y - a->y);
|
|
*t = tt;
|
|
*d = graphene_point_distance (pp, p, NULL, NULL);
|
|
}
|
|
}
|
|
|
|
static void
|
|
gsk_split_get_coefficients (graphene_point_t coeffs[4],
|
|
const graphene_point_t pts[4])
|
|
{
|
|
coeffs[0] = GRAPHENE_POINT_INIT (pts[3].x - 3.0f * pts[2].x + 3.0f * pts[1].x - pts[0].x,
|
|
pts[3].y - 3.0f * pts[2].y + 3.0f * pts[1].y - pts[0].y);
|
|
coeffs[1] = GRAPHENE_POINT_INIT (3.0f * pts[2].x - 6.0f * pts[1].x + 3.0f * pts[0].x,
|
|
3.0f * pts[2].y - 6.0f * pts[1].y + 3.0f * pts[0].y);
|
|
coeffs[2] = GRAPHENE_POINT_INIT (3.0f * pts[1].x - 3.0f * pts[0].x,
|
|
3.0f * pts[1].y - 3.0f * pts[0].y);
|
|
coeffs[3] = pts[0];
|
|
}
|
|
|
|
static void
|
|
gsk_spline_get_point_cubic (const graphene_point_t pts[4],
|
|
float progress,
|
|
graphene_point_t *pos,
|
|
graphene_vec2_t *tangent)
|
|
{
|
|
graphene_point_t c[4];
|
|
|
|
gsk_split_get_coefficients (c, pts);
|
|
if (pos)
|
|
*pos = GRAPHENE_POINT_INIT (((c[0].x * progress + c[1].x) * progress +c[2].x) * progress + c[3].x,
|
|
((c[0].y * progress + c[1].y) * progress +c[2].y) * progress + c[3].y);
|
|
if (tangent)
|
|
{
|
|
graphene_vec2_init (tangent,
|
|
(3.0f * c[0].x * progress + 2.0f * c[1].x) * progress + c[2].x,
|
|
(3.0f * c[0].y * progress + 2.0f * c[1].y) * progress + c[2].y);
|
|
graphene_vec2_normalize (tangent, tangent);
|
|
}
|
|
}
|
|
|
|
static void
|
|
find_curve_point (graphene_point_t *points,
|
|
graphene_point_t *p,
|
|
double *t,
|
|
graphene_point_t *pp,
|
|
double *d)
|
|
{
|
|
graphene_point_t q;
|
|
graphene_point_t best_p;
|
|
double best_d;
|
|
double best_t;
|
|
double dd;
|
|
double tt;
|
|
int i;
|
|
|
|
best_d = G_MAXDOUBLE;
|
|
best_t = 0;
|
|
|
|
for (i = 0; i < 20; i++)
|
|
{
|
|
tt = i / 20.0;
|
|
gsk_spline_get_point_cubic (points, tt, &q, NULL);
|
|
dd = graphene_point_distance (&q, p, NULL, NULL);
|
|
if (dd < best_d)
|
|
{
|
|
best_d = dd;
|
|
best_t = tt;
|
|
best_p = q;
|
|
}
|
|
}
|
|
|
|
/* TODO: bisect from here */
|
|
|
|
*t = best_t;
|
|
*pp = best_p;
|
|
*d = best_d;
|
|
}
|
|
|
|
static void
|
|
find_closest_point (CurveEditor *self,
|
|
graphene_point_t *p,
|
|
int *point,
|
|
double *t,
|
|
double *d)
|
|
{
|
|
int i;
|
|
int best_i;
|
|
double best_d;
|
|
double best_t;
|
|
double tt;
|
|
double dd;
|
|
graphene_point_t pp;
|
|
|
|
best_i = -1;
|
|
best_d = G_MAXDOUBLE;
|
|
best_t = 0;
|
|
|
|
for (i = 0; i < self->n_points; i++)
|
|
{
|
|
if (i % 3 != 0)
|
|
continue;
|
|
|
|
switch (self->point_data[i / 3].op)
|
|
{
|
|
case MOVE:
|
|
continue;
|
|
case LINE:
|
|
find_line_point (&self->points[i], &self->points[(i + 3) % self->n_points], p, &tt, &pp, &dd);
|
|
if (dd < best_d)
|
|
{
|
|
best_i = i;
|
|
best_d = dd;
|
|
best_t = tt;
|
|
}
|
|
break;
|
|
case CURVE:
|
|
{
|
|
graphene_point_t points[4];
|
|
int k;
|
|
|
|
for (k = 0; k < 4; k++)
|
|
points[k] = self->points[(i + k) % self->n_points];
|
|
|
|
find_curve_point (points, p, &tt, &pp, &dd);
|
|
if (dd < best_d)
|
|
{
|
|
best_i = i;
|
|
best_d = dd;
|
|
best_t = tt;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
g_assert_not_reached ();
|
|
}
|
|
}
|
|
|
|
*point = best_i;
|
|
*t = best_t;
|
|
*d = best_d;
|
|
}
|
|
|
|
static void
|
|
split_bezier (graphene_point_t *points,
|
|
int length,
|
|
float t,
|
|
graphene_point_t *left,
|
|
int *left_pos,
|
|
graphene_point_t *right,
|
|
int *right_pos)
|
|
{
|
|
if (length == 1)
|
|
{
|
|
left[*left_pos] = points[0];
|
|
(*left_pos)++;
|
|
right[*right_pos] = points[0];
|
|
(*right_pos)++;
|
|
}
|
|
else
|
|
{
|
|
graphene_point_t *newpoints;
|
|
int i;
|
|
|
|
newpoints = g_alloca (sizeof (graphene_point_t) * (length - 1));
|
|
for (i = 0; i < length - 1; i++)
|
|
{
|
|
if (i == 0)
|
|
{
|
|
left[*left_pos] = points[i];
|
|
(*left_pos)++;
|
|
}
|
|
if (i == length - 2)
|
|
{
|
|
right[*right_pos] = points[i + 1];
|
|
(*right_pos)++;
|
|
}
|
|
graphene_point_interpolate (&points[i], &points[i+1], t, &newpoints[i]);
|
|
}
|
|
split_bezier (newpoints, length - 1, t, left, left_pos, right, right_pos);
|
|
}
|
|
}
|
|
|
|
static void
|
|
insert_point (CurveEditor *self,
|
|
int point,
|
|
double pos)
|
|
{
|
|
Operation op = self->point_data[point / 3].op;
|
|
int i;
|
|
graphene_point_t points[4];
|
|
int k;
|
|
|
|
if (op == MOVE)
|
|
return;
|
|
|
|
for (k = 0; k < 4; k++)
|
|
points[k] = self->points[(point + k) % self->n_points];
|
|
|
|
self->point_data = g_realloc (self->point_data, sizeof (PointData) * (self->n_points / 3 + 1));
|
|
for (i = self->n_points / 3; i > point / 3; i--)
|
|
self->point_data[i] = self->point_data[i - 1];
|
|
|
|
self->points = g_realloc (self->points, sizeof (graphene_point_t) * (self->n_points + 3));
|
|
for (i = self->n_points + 2; i > point + 4; i--)
|
|
self->points[i] = self->points[i - 3];
|
|
|
|
self->n_points += 3;
|
|
|
|
if (op == LINE)
|
|
{
|
|
graphene_point_t p;
|
|
graphene_point_t q;
|
|
|
|
graphene_point_interpolate (&self->points[point], &self->points[(point + 6) % self->n_points], pos, &p);
|
|
self->points[point + 3] = p;
|
|
|
|
graphene_point_interpolate (&p, &self->points[(point + 6) % self->n_points], 0.33, &q);
|
|
|
|
self->points[point + 4] = q;
|
|
|
|
graphene_point_interpolate (&p, &self->points[(point + 6) % self->n_points], 0.66, &q);
|
|
|
|
self->points[point + 5] = q;
|
|
self->point_data[point / 3 + 1].smooth = TRUE;
|
|
self->point_data[point / 3 + 1].op = LINE;
|
|
}
|
|
else if (op == CURVE)
|
|
{
|
|
graphene_point_t left[4];
|
|
graphene_point_t right[4];
|
|
int left_pos = 0;
|
|
int right_pos = 0;
|
|
|
|
split_bezier (points, 4, pos, left, &left_pos, right, &right_pos);
|
|
|
|
for (k = 0; k < 4; k++)
|
|
{
|
|
self->points[(point + k) % self->n_points] = left[k];
|
|
self->points[(point + 3 + k) % self->n_points] = right[3 - k];
|
|
}
|
|
|
|
self->point_data[point / 3 + 1].smooth = TRUE;
|
|
self->point_data[point / 3 + 1].op = CURVE;
|
|
}
|
|
|
|
gtk_widget_queue_draw (GTK_WIDGET (self));
|
|
}
|
|
|
|
static void
|
|
maybe_insert_point (CurveEditor *self,
|
|
double x,
|
|
double y)
|
|
{
|
|
graphene_point_t m = GRAPHENE_POINT_INIT (x, y);
|
|
int point;
|
|
double t;
|
|
double d;
|
|
|
|
find_closest_point (self, &m, &point, &t, &d);
|
|
|
|
if (d > CLICK_RADIUS)
|
|
return;
|
|
|
|
insert_point (self, point, t);
|
|
}
|
|
|
|
static void
|
|
pressed (GtkGestureClick *gesture,
|
|
int n_press,
|
|
double x,
|
|
double y,
|
|
CurveEditor *self)
|
|
{
|
|
graphene_point_t m = GRAPHENE_POINT_INIT (x, y);
|
|
int i;
|
|
int button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
|
|
|
|
if (!self->edit)
|
|
return;
|
|
|
|
if (button == GDK_BUTTON_SECONDARY)
|
|
for (i = 0; i < self->n_points; i++)
|
|
{
|
|
if (i % 3 != 0 || !point_is_visible (self, i))
|
|
continue;
|
|
|
|
if (graphene_point_distance (&self->points[i], &m, NULL, NULL) < CLICK_RADIUS)
|
|
{
|
|
GAction *action;
|
|
|
|
self->context = i;
|
|
|
|
action = g_action_map_lookup_action (self->actions, "smooth");
|
|
g_simple_action_set_state (G_SIMPLE_ACTION (action), g_variant_new_boolean (self->point_data[i / 3].smooth));
|
|
|
|
action = g_action_map_lookup_action (self->actions, "symmetric");
|
|
if (self->point_data[i / 3].smooth)
|
|
{
|
|
g_simple_action_set_enabled (G_SIMPLE_ACTION (action), TRUE);
|
|
g_simple_action_set_state (G_SIMPLE_ACTION (action), g_variant_new_boolean (self->point_data[i / 3].symmetric));
|
|
}
|
|
else
|
|
{
|
|
g_simple_action_set_enabled (G_SIMPLE_ACTION (action), FALSE);
|
|
g_simple_action_set_state (G_SIMPLE_ACTION (action), FALSE);
|
|
}
|
|
|
|
action = g_action_map_lookup_action (self->actions, "operation");
|
|
|
|
g_simple_action_set_state (G_SIMPLE_ACTION (action), g_variant_new_string (op_to_string (self->point_data[i / 3].op)));
|
|
|
|
gtk_popover_set_pointing_to (GTK_POPOVER (self->menu),
|
|
&(const GdkRectangle){ x, y, 1, 1 });
|
|
gtk_popover_popup (GTK_POPOVER (self->menu));
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
released (GtkGestureClick *gesture,
|
|
int n_press,
|
|
double x,
|
|
double y,
|
|
CurveEditor *self)
|
|
{
|
|
graphene_point_t m = GRAPHENE_POINT_INIT (x, y);
|
|
int button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
|
|
int i;
|
|
|
|
if (!self->edit)
|
|
return;
|
|
|
|
for (i = 0; i < self->n_points; i++)
|
|
{
|
|
if (!point_is_visible (self, i))
|
|
continue;
|
|
|
|
if (graphene_point_distance (&self->points[i], &m, NULL, NULL) < CLICK_RADIUS)
|
|
{
|
|
if (i % 3 == 0)
|
|
{
|
|
if (button == GDK_BUTTON_PRIMARY)
|
|
{
|
|
self->point_data[i / 3].edit = !self->point_data[i / 3].edit;
|
|
return;
|
|
}
|
|
else if (button == GDK_BUTTON_SECONDARY)
|
|
{
|
|
self->context = i;
|
|
self->point_data[i / 3].smooth = !self->point_data[i / 3].smooth;
|
|
if (self->point_data[i / 3].smooth)
|
|
{
|
|
graphene_point_t *p, *c, *c2;
|
|
float d;
|
|
|
|
p = &self->points[i];
|
|
c = &self->points[(i - 1 + self->n_points) % self->n_points];
|
|
c2 = &self->points[(i + 1 + self->n_points) % self->n_points];
|
|
|
|
d = graphene_point_distance (c, p, NULL, NULL);
|
|
opposite_point (p, c2, d, c);
|
|
}
|
|
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (button == GDK_BUTTON_PRIMARY)
|
|
maybe_insert_point (self, x, y);
|
|
}
|
|
|
|
static void
|
|
motion (GtkEventControllerMotion *controller,
|
|
double x,
|
|
double y,
|
|
CurveEditor *self)
|
|
{
|
|
graphene_point_t m = GRAPHENE_POINT_INIT (x, y);
|
|
int i;
|
|
int was_hovered = self->hovered;
|
|
|
|
self->hovered = -1;
|
|
|
|
if (self->edit)
|
|
for (i = 0; i < self->n_points; i++)
|
|
{
|
|
if (!point_is_visible (self, i))
|
|
continue;
|
|
|
|
if (graphene_point_distance (&self->points[i], &m, NULL, NULL) < CLICK_RADIUS)
|
|
{
|
|
if (self->hovered != i)
|
|
self->hovered = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (self->hovered != was_hovered)
|
|
gtk_widget_queue_draw (GTK_WIDGET (self));
|
|
}
|
|
|
|
static void
|
|
leave (GtkEventController *controller,
|
|
CurveEditor *self)
|
|
{
|
|
if (self->hovered != -1)
|
|
{
|
|
self->hovered = -1;
|
|
gtk_widget_queue_draw (GTK_WIDGET (self));
|
|
}
|
|
}
|
|
|
|
static void
|
|
curve_editor_init (CurveEditor *self)
|
|
{
|
|
GtkEventController *controller;
|
|
GMenu *menu;
|
|
GMenu *section;
|
|
GMenuItem *item;
|
|
GSimpleAction *action;
|
|
|
|
self->dragged = -1;
|
|
self->edit = FALSE;
|
|
|
|
controller = GTK_EVENT_CONTROLLER (gtk_gesture_drag_new ());
|
|
gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (controller), GDK_BUTTON_PRIMARY);
|
|
g_signal_connect (controller, "drag-begin", G_CALLBACK (drag_begin), self);
|
|
g_signal_connect (controller, "drag-update", G_CALLBACK (drag_update), self);
|
|
g_signal_connect (controller, "drag-end", G_CALLBACK (drag_end), self);
|
|
gtk_widget_add_controller (GTK_WIDGET (self), controller);
|
|
|
|
controller = GTK_EVENT_CONTROLLER (gtk_gesture_click_new ());
|
|
gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (controller), 0);
|
|
g_signal_connect (controller, "pressed", G_CALLBACK (pressed), self);
|
|
g_signal_connect (controller, "released", G_CALLBACK (released), self);
|
|
gtk_widget_add_controller (GTK_WIDGET (self), controller);
|
|
|
|
controller = gtk_event_controller_motion_new ();
|
|
g_signal_connect (controller, "motion", G_CALLBACK (motion), self);
|
|
g_signal_connect (controller, "leave", G_CALLBACK (leave), self);
|
|
gtk_widget_add_controller (GTK_WIDGET (self), controller);
|
|
|
|
self->points = NULL;
|
|
self->point_data = NULL;
|
|
self->n_points = 0;
|
|
|
|
self->actions = G_ACTION_MAP (g_simple_action_group_new ());
|
|
|
|
action = g_simple_action_new_stateful ("smooth", NULL, g_variant_new_boolean (FALSE));
|
|
g_signal_connect (action, "change-state", G_CALLBACK (set_smooth), self);
|
|
g_action_map_add_action (G_ACTION_MAP (self->actions), G_ACTION (action));
|
|
gtk_widget_insert_action_group (GTK_WIDGET (self), "point", G_ACTION_GROUP (self->actions));
|
|
|
|
action = g_simple_action_new_stateful ("symmetric", NULL, g_variant_new_boolean (FALSE));
|
|
g_signal_connect (action, "change-state", G_CALLBACK (set_symmetric), self);
|
|
g_action_map_add_action (G_ACTION_MAP (self->actions), G_ACTION (action));
|
|
gtk_widget_insert_action_group (GTK_WIDGET (self), "point", G_ACTION_GROUP (self->actions));
|
|
|
|
action = g_simple_action_new_stateful ("operation", G_VARIANT_TYPE_STRING, g_variant_new_string ("curve"));
|
|
g_signal_connect (action, "change-state", G_CALLBACK (set_operation), self);
|
|
g_action_map_add_action (G_ACTION_MAP (self->actions), G_ACTION (action));
|
|
|
|
action = g_simple_action_new ("remove", NULL);
|
|
g_signal_connect (action, "activate", G_CALLBACK (remove_point), self);
|
|
g_action_map_add_action (G_ACTION_MAP (self->actions), G_ACTION (action));
|
|
|
|
gtk_widget_insert_action_group (GTK_WIDGET (self), "point", G_ACTION_GROUP (self->actions));
|
|
|
|
menu = g_menu_new ();
|
|
|
|
item = g_menu_item_new ("Smooth", "point.smooth");
|
|
g_menu_append_item (menu, item);
|
|
g_object_unref (item);
|
|
|
|
item = g_menu_item_new ("Symmetric", "point.symmetric");
|
|
g_menu_append_item (menu, item);
|
|
g_object_unref (item);
|
|
|
|
section = g_menu_new ();
|
|
|
|
item = g_menu_item_new ("Move", "point.operation::move");
|
|
g_menu_append_item (section, item);
|
|
g_object_unref (item);
|
|
|
|
item = g_menu_item_new ("Line", "point.operation::line");
|
|
g_menu_append_item (section, item);
|
|
g_object_unref (item);
|
|
|
|
item = g_menu_item_new ("Curve", "point.operation::curve");
|
|
g_menu_append_item (section, item);
|
|
g_object_unref (item);
|
|
|
|
g_menu_append_section (menu, NULL, G_MENU_MODEL (section));
|
|
g_object_unref (section);
|
|
|
|
item = g_menu_item_new ("Remove", "point.remove");
|
|
g_menu_append_item (section, item);
|
|
g_object_unref (item);
|
|
|
|
self->menu = gtk_popover_menu_new_from_model (G_MENU_MODEL (menu));
|
|
g_object_unref (menu);
|
|
|
|
gtk_widget_set_parent (self->menu, GTK_WIDGET (self));
|
|
}
|
|
|
|
static void
|
|
curve_editor_add_path (CurveEditor *self,
|
|
GskPathBuilder *builder)
|
|
{
|
|
int i;
|
|
|
|
gsk_path_builder_move_to (builder, self->points[0].x, self->points[0].y);
|
|
for (i = 1; i < self->n_points; i += 3)
|
|
{
|
|
switch (self->point_data[i / 3].op)
|
|
{
|
|
case MOVE:
|
|
gsk_path_builder_move_to (builder,
|
|
self->points[(i + 2) % self->n_points].x, self->points[(i + 2) % self->n_points].y);
|
|
break;
|
|
|
|
case LINE:
|
|
gsk_path_builder_line_to (builder,
|
|
self->points[(i + 2) % self->n_points].x, self->points[(i + 2) % self->n_points].y);
|
|
break;
|
|
|
|
case CURVE:
|
|
gsk_path_builder_curve_to (builder,
|
|
self->points[i].x, self->points[i].y,
|
|
self->points[(i + 1) % self->n_points].x, self->points[(i + 1) % self->n_points].y,
|
|
self->points[(i + 2) % self->n_points].x, self->points[(i + 2) % self->n_points].y);
|
|
break;
|
|
default:
|
|
g_assert_not_reached ();
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
curve_editor_snapshot (GtkWidget *widget,
|
|
GtkSnapshot *snapshot)
|
|
{
|
|
CurveEditor *self = (CurveEditor *)widget;
|
|
GskPathBuilder *builder;
|
|
GskPath *path;
|
|
GskStroke *stroke;
|
|
int i, j;
|
|
float width;
|
|
float height;
|
|
|
|
if (self->n_points == 0)
|
|
return;
|
|
|
|
width = gtk_widget_get_width (widget);
|
|
height = gtk_widget_get_width (widget);
|
|
|
|
builder = gsk_path_builder_new ();
|
|
|
|
if (self->edit)
|
|
{
|
|
/* Add the skeleton */
|
|
gsk_path_builder_move_to (builder, self->points[0].x, self->points[0].y);
|
|
for (i = 1; i < self->n_points; i++)
|
|
{
|
|
if (i % 3 != 2 &&
|
|
point_is_visible (self, i) &&
|
|
point_is_visible (self, (i - 1 + self->n_points) % self->n_points))
|
|
gsk_path_builder_line_to (builder, self->points[i].x, self->points[i].y);
|
|
else
|
|
gsk_path_builder_move_to (builder, self->points[i].x, self->points[i].y);
|
|
}
|
|
if (point_is_visible (self, 0) &&
|
|
point_is_visible (self, self->n_points - 1))
|
|
gsk_path_builder_line_to (builder, self->points[0].x, self->points[0].y);
|
|
}
|
|
|
|
/* Add the curve itself */
|
|
|
|
curve_editor_add_path (self, builder);
|
|
|
|
/* Stroke everything we have so far */
|
|
|
|
path = gsk_path_builder_free_to_path (builder);
|
|
stroke = gsk_stroke_new (1);
|
|
gtk_snapshot_push_stroke (snapshot, path, stroke);
|
|
gsk_stroke_free (stroke);
|
|
gsk_path_unref (path);
|
|
|
|
gtk_snapshot_append_color (snapshot,
|
|
&(GdkRGBA){ 0, 0, 0, 1 },
|
|
&GRAPHENE_RECT_INIT (0, 0, width, height ));
|
|
|
|
gtk_snapshot_pop (snapshot);
|
|
|
|
if (self->edit)
|
|
{
|
|
/* Draw the circles, in several passes, one for each color */
|
|
|
|
const char *colors[] = {
|
|
"white", /* hovered */
|
|
"red", /* smooth curve points */
|
|
"green", /* sharp curve points */
|
|
"blue" /* control points */
|
|
};
|
|
GdkRGBA color;
|
|
|
|
for (j = 0; j < 4; j++)
|
|
{
|
|
builder = gsk_path_builder_new ();
|
|
|
|
for (i = 0; i < self->n_points; i++)
|
|
{
|
|
switch (j)
|
|
{
|
|
case 0:
|
|
if (i != self->hovered)
|
|
continue;
|
|
break;
|
|
|
|
case 1:
|
|
if (i == self->hovered)
|
|
continue;
|
|
|
|
if (!(i % 3 == 0 &&
|
|
self->point_data[i / 3].smooth))
|
|
continue;
|
|
break;
|
|
|
|
case 2:
|
|
if (i == self->hovered)
|
|
continue;
|
|
|
|
if (!(i % 3 == 0 &&
|
|
!self->point_data[i / 3].smooth))
|
|
continue;
|
|
break;
|
|
|
|
case 3:
|
|
if (i == self->hovered)
|
|
continue;
|
|
|
|
if (i % 3 == 1)
|
|
{
|
|
if (!(self->point_data[i / 3].edit &&
|
|
self->point_data[i / 3].op == CURVE))
|
|
continue;
|
|
}
|
|
else if (i % 3 == 2)
|
|
{
|
|
if (!(self->point_data[((i + 3) % self->n_points) / 3].edit &&
|
|
self->point_data[i / 3].op == CURVE))
|
|
continue;
|
|
}
|
|
else
|
|
continue;
|
|
break;
|
|
|
|
default:
|
|
g_assert_not_reached ();
|
|
}
|
|
|
|
gsk_path_builder_add_circle (builder, &self->points[i], DRAW_RADIUS);
|
|
}
|
|
|
|
path = gsk_path_builder_free_to_path (builder);
|
|
|
|
gtk_snapshot_push_fill (snapshot, path, GSK_FILL_RULE_WINDING);
|
|
gdk_rgba_parse (&color, colors[j]);
|
|
gtk_snapshot_append_color (snapshot, &color, &GRAPHENE_RECT_INIT (0, 0, width, height));
|
|
gtk_snapshot_pop (snapshot);
|
|
|
|
stroke = gsk_stroke_new (1.0);
|
|
gtk_snapshot_push_stroke (snapshot, path, stroke);
|
|
gsk_stroke_free (stroke);
|
|
|
|
gdk_rgba_parse (&color, "black");
|
|
gtk_snapshot_append_color (snapshot, &color, &GRAPHENE_RECT_INIT (0, 0, width, height));
|
|
gtk_snapshot_pop (snapshot);
|
|
|
|
gsk_path_unref (path);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
curve_editor_measure (GtkWidget *widget,
|
|
GtkOrientation orientation,
|
|
int for_size,
|
|
int *minimum_size,
|
|
int *natural_size,
|
|
int *minimum_baseline,
|
|
int *natural_baseline)
|
|
{
|
|
*minimum_size = 100;
|
|
*natural_size = 200;
|
|
}
|
|
|
|
static void
|
|
curve_editor_size_allocate (GtkWidget *widget,
|
|
int width,
|
|
int height,
|
|
int baseline)
|
|
{
|
|
CurveEditor *self = CURVE_EDITOR (widget);
|
|
|
|
gtk_native_check_resize (GTK_NATIVE (self->menu));
|
|
}
|
|
|
|
static void
|
|
curve_editor_dispose (GObject *object)
|
|
{
|
|
CurveEditor *self = CURVE_EDITOR (object);
|
|
|
|
g_clear_pointer (&self->points, g_free);
|
|
g_clear_pointer (&self->point_data, g_free);
|
|
g_clear_pointer (&self->menu, gtk_widget_unparent);
|
|
|
|
G_OBJECT_CLASS (curve_editor_parent_class)->dispose (object);
|
|
}
|
|
|
|
static void
|
|
curve_editor_class_init (CurveEditorClass *class)
|
|
{
|
|
GObjectClass *object_class = G_OBJECT_CLASS (class);
|
|
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
|
|
|
|
object_class->dispose = curve_editor_dispose;
|
|
|
|
widget_class->snapshot = curve_editor_snapshot;
|
|
widget_class->measure = curve_editor_measure;
|
|
widget_class->size_allocate = curve_editor_size_allocate;
|
|
}
|
|
|
|
GtkWidget *
|
|
curve_editor_new (void)
|
|
{
|
|
return g_object_new (curve_editor_get_type (), NULL);
|
|
}
|
|
|
|
void
|
|
curve_editor_set_edit (CurveEditor *self,
|
|
gboolean edit)
|
|
{
|
|
int i;
|
|
|
|
self->edit = edit;
|
|
if (!self->edit)
|
|
{
|
|
self->hovered = -1;
|
|
for (i = 0; i < self->n_points / 3; i++)
|
|
self->point_data[i].edit = FALSE;
|
|
}
|
|
|
|
gtk_widget_queue_draw (GTK_WIDGET (self));
|
|
}
|
|
|
|
typedef struct
|
|
{
|
|
int count;
|
|
graphene_point_t first;
|
|
graphene_point_t last;
|
|
gboolean has_close;
|
|
gboolean has_initial_move;
|
|
} CountSegmentData;
|
|
|
|
static gboolean
|
|
count_segments (GskPathOperation op,
|
|
const graphene_point_t *pts,
|
|
gsize n_pts,
|
|
gpointer data)
|
|
{
|
|
CountSegmentData *d = data;
|
|
|
|
if (d->count == 0)
|
|
{
|
|
d->first = pts[0];
|
|
if (op == GSK_PATH_MOVE)
|
|
d->has_initial_move = TRUE;
|
|
}
|
|
|
|
d->last = pts[n_pts - 1];
|
|
d->count++;
|
|
|
|
if (op == GSK_PATH_CLOSE)
|
|
d->has_close = TRUE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
typedef struct
|
|
{
|
|
CurveEditor *editor;
|
|
int pos;
|
|
} CopySegmentData;
|
|
|
|
static gboolean
|
|
copy_segments (GskPathOperation op,
|
|
const graphene_point_t *pts,
|
|
gsize n_pts,
|
|
gpointer data)
|
|
{
|
|
CopySegmentData *d = data;
|
|
|
|
switch (op)
|
|
{
|
|
case GSK_PATH_MOVE:
|
|
if (d->pos != 0)
|
|
{
|
|
d->editor->point_data[d->pos / 3].op = MOVE;
|
|
d->editor->point_data[d->pos / 3].smooth = FALSE;
|
|
|
|
d->editor->points[d->pos++] = pts[0];
|
|
d->editor->points[d->pos++] = pts[0];
|
|
if (d->pos < d->editor->n_points)
|
|
d->editor->points[d->pos++] = pts[0];
|
|
}
|
|
break;
|
|
case GSK_PATH_CLOSE:
|
|
break;
|
|
case GSK_PATH_LINE:
|
|
d->editor->point_data[d->pos / 3].op = LINE;
|
|
d->editor->point_data[d->pos / 3].smooth = FALSE;
|
|
|
|
if (d->pos == 0)
|
|
d->editor->points[d->pos++] = pts[0];
|
|
|
|
d->editor->points[d->pos++] = pts[1];
|
|
d->editor->points[d->pos++] = pts[1];
|
|
if (d->pos < d->editor->n_points)
|
|
d->editor->points[d->pos++] = pts[1];
|
|
break;
|
|
case GSK_PATH_CURVE:
|
|
d->editor->point_data[d->pos / 3].op = CURVE;
|
|
d->editor->point_data[d->pos / 3].smooth = FALSE;
|
|
|
|
if (d->pos == 0)
|
|
d->editor->points[d->pos++] = pts[0];
|
|
|
|
d->editor->points[d->pos++] = pts[1];
|
|
d->editor->points[d->pos++] = pts[2];
|
|
|
|
if (d->pos < d->editor->n_points)
|
|
d->editor->points[d->pos++] = pts[3];
|
|
break;
|
|
default:
|
|
g_assert_not_reached ();
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Check if the points arount point currently satisy
|
|
* smoothness conditions. Set PointData.smooth accordingly.
|
|
*/
|
|
static void
|
|
update_smoothness (CurveEditor *self,
|
|
int point)
|
|
{
|
|
Operation op, op1;
|
|
graphene_point_t *p, *p2, *p1;
|
|
|
|
p = &self->points[point];
|
|
op = self->point_data[point / 3].op;
|
|
op1 = self->point_data[((point - 1 + self->n_points) % self->n_points) / 3].op;
|
|
|
|
if (op == CURVE)
|
|
p2 = &self->points[(point + 1) % self->n_points];
|
|
else if (op == LINE)
|
|
p2 = &self->points[(point + 3) % self->n_points];
|
|
else
|
|
p2 = NULL;
|
|
|
|
if (op1 == CURVE)
|
|
p1 = &self->points[(point - 1 + self->n_points) % self->n_points];
|
|
else if (op1 == LINE)
|
|
p1 = &self->points[(point - 3 + self->n_points) % self->n_points];
|
|
else
|
|
p1 = NULL;
|
|
|
|
if (p1 && p2)
|
|
self->point_data[point / 3].smooth = collinear (p, p1, p2);
|
|
else
|
|
self->point_data[point / 3].smooth = TRUE;
|
|
}
|
|
|
|
void
|
|
curve_editor_set_path (CurveEditor *self,
|
|
GskPath *path)
|
|
{
|
|
CountSegmentData data;
|
|
CopySegmentData data2;
|
|
int i;
|
|
|
|
g_clear_pointer (&self->points, g_free);
|
|
g_clear_pointer (&self->point_data, g_free);
|
|
self->n_points = 0;
|
|
|
|
data.count = 0;
|
|
data.has_close = FALSE;
|
|
gsk_path_foreach (path, count_segments, &data);
|
|
|
|
if (data.has_initial_move)
|
|
data.count--;
|
|
|
|
if (!graphene_point_near (&data.first, &data.last, 0.0001) && !data.has_close)
|
|
data.count++;
|
|
|
|
self->n_points = data.count * 3;
|
|
self->points = g_new0 (graphene_point_t, self->n_points);
|
|
self->point_data = g_new0 (PointData, data.count);
|
|
|
|
data2.editor = self;
|
|
data2.pos = 0;
|
|
gsk_path_foreach (path, copy_segments, &data2);
|
|
|
|
for (i = 0; i < self->n_points; i += 3)
|
|
update_smoothness (self, i);
|
|
|
|
gtk_widget_queue_draw (GTK_WIDGET (self));
|
|
}
|
|
|
|
GskPath *
|
|
curve_editor_get_path (CurveEditor *self)
|
|
{
|
|
GskPathBuilder *builder;
|
|
|
|
builder = gsk_path_builder_new ();
|
|
|
|
curve_editor_add_path (self, builder);
|
|
|
|
return gsk_path_builder_free_to_path (builder);
|
|
}
|