401 lines
11 KiB
C
401 lines
11 KiB
C
#include <gtk/gtk.h>
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#define DEMO_TYPE_WIDGET (demo_widget_get_type ())
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G_DECLARE_FINAL_TYPE (DemoWidget, demo_widget, DEMO, WIDGET, GtkWidget)
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struct _DemoWidget
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{
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GtkWidget parent_instance;
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GskPath *orig_path;
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GskPath *path;
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GskPathMeasure *measure;
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double x, y;
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graphene_point_t point;
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graphene_point_t point2;
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graphene_vec2_t tangent;
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double start, end;
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gboolean track;
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gboolean show_bounding_box;
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GtkWidget *label;
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};
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struct _DemoWidgetClass
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{
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GtkWidgetClass parent_class;
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};
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G_DEFINE_TYPE (DemoWidget, demo_widget, GTK_TYPE_WIDGET)
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static void
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motion (GtkEventControllerMotion *controller,
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double x,
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double y,
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DemoWidget *self)
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{
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float distance;
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char *text;
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float t;
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if (!self->track)
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return;
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self->x = x;
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self->y = y;
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gsk_path_measure_get_closest_point_full (self->measure,
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&GRAPHENE_POINT_INIT (x, y),
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FLT_MAX,
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&distance,
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&self->point,
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&t,
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&self->tangent);
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gsk_path_measure_get_point (self->measure, t, &self->point2, NULL);
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text = g_strdup_printf ("%.1f", distance);
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gtk_label_set_label (GTK_LABEL (self->label), text);
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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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demo_widget_init (DemoWidget *self)
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{
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GtkEventController *controller;
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self->start = 0;
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self->end = 1;
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self->label = gtk_label_new ("");
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gtk_widget_set_parent (self->label, GTK_WIDGET (self));
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gtk_widget_set_halign (self->label, GTK_ALIGN_END);
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gtk_widget_set_valign (self->label, GTK_ALIGN_START);
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controller = gtk_event_controller_motion_new ();
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g_signal_connect (controller, "motion", G_CALLBACK (motion), self);
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gtk_widget_add_controller (GTK_WIDGET (self), controller);
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}
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static void
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demo_widget_snapshot (GtkWidget *widget,
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GtkSnapshot *snapshot)
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{
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DemoWidget *self = DEMO_WIDGET (widget);
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int width, height;
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GskStroke *stroke;
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GskPathBuilder *builder;
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GskPath *path;
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graphene_point_t p;
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if (!self->path)
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return;
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width = gtk_widget_get_width (widget);
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height = gtk_widget_get_width (widget);
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stroke = gsk_stroke_new (1.0);
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gtk_snapshot_push_stroke (snapshot, self->path, stroke);
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gsk_stroke_free (stroke);
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gtk_snapshot_append_color (snapshot,
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&(GdkRGBA){ 0, 0, 0, 1},
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&GRAPHENE_RECT_INIT (0, 0, width, height ));
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gtk_snapshot_pop (snapshot);
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if (self->show_bounding_box)
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{
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graphene_rect_t bounds;
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if (gsk_path_get_bounds (self->path, &bounds))
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{
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_rect (builder,
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bounds.origin.x, bounds.origin.y,
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bounds.size.width, bounds.size.height);
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path = gsk_path_builder_free_to_path (builder);
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stroke = gsk_stroke_new (1.0);
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gtk_snapshot_push_stroke (snapshot, path, stroke);
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gsk_stroke_free (stroke);
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gtk_snapshot_append_color (snapshot,
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&(GdkRGBA){ 0, 0, 0, 0.5},
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&GRAPHENE_RECT_INIT (0, 0, width, height ));
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gtk_snapshot_pop (snapshot);
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gsk_path_unref (path);
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}
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}
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if (self->track)
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{
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p.x = self->point.x + graphene_vec2_get_x (&self->tangent) * 40;
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p.y = self->point.y + graphene_vec2_get_y (&self->tangent) * 40;
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builder = gsk_path_builder_new ();
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gsk_path_builder_move_to (builder, self->point.x, self->point.y);
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gsk_path_builder_line_to (builder, p.x, p.y);
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path = gsk_path_builder_free_to_path (builder);
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stroke = gsk_stroke_new (1.0);
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gtk_snapshot_push_stroke (snapshot, path, stroke);
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gsk_stroke_free (stroke);
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gtk_snapshot_append_color (snapshot,
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&(GdkRGBA){ 0, 0, 0, 1},
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&GRAPHENE_RECT_INIT (0, 0, width, height ));
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gtk_snapshot_pop (snapshot);
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gsk_path_unref (path);
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_circle (builder, &self->point, 5);
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gsk_path_builder_add_circle (builder, &p, 2.5);
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gsk_path_builder_add_circle (builder, &self->point2, 5);
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path = gsk_path_builder_free_to_path (builder);
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gtk_snapshot_push_fill (snapshot, path, 0);
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gtk_snapshot_append_color (snapshot,
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&(GdkRGBA){ 1, 0, 0, 1},
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&GRAPHENE_RECT_INIT (0, 0, width, height ));
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gtk_snapshot_pop (snapshot);
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stroke = gsk_stroke_new (1.0);
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gtk_snapshot_push_stroke (snapshot, path, stroke);
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gsk_stroke_free (stroke);
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gtk_snapshot_append_color (snapshot,
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&(GdkRGBA){ 0, 0, 0, 1},
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&GRAPHENE_RECT_INIT (0, 0, width, height ));
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gtk_snapshot_pop (snapshot);
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gsk_path_unref (path);
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gtk_widget_snapshot_child (widget, self->label, snapshot);
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}
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}
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static void
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demo_widget_dispose (GObject *object)
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{
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DemoWidget *self = DEMO_WIDGET (object);
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g_clear_pointer (&self->path, gsk_path_unref);
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g_clear_pointer (&self->measure, gsk_path_measure_unref);
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g_clear_pointer (&self->label, gtk_widget_unparent);
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G_OBJECT_CLASS (demo_widget_parent_class)->dispose (object);
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}
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static void
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demo_widget_class_init (DemoWidgetClass *class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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object_class->dispose = demo_widget_dispose;
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widget_class->snapshot = demo_widget_snapshot;
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gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
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}
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static GtkWidget *
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demo_widget_new (void)
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{
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return g_object_new (DEMO_TYPE_WIDGET, NULL);
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}
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static void
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update_path (DemoWidget *self)
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{
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g_clear_pointer (&self->path, gsk_path_unref);
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g_clear_pointer (&self->measure, gsk_path_measure_unref);
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if (self->start > 0 || self->end < 1)
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{
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GskPathMeasure *measure;
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GskPathBuilder *builder;
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float length;
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measure = gsk_path_measure_new (self->orig_path);
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length = gsk_path_measure_get_length (measure);
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builder = gsk_path_builder_new ();
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gsk_path_measure_add_segment (measure, builder, self->start * length, self->end * length);
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self->path = gsk_path_builder_free_to_path (builder);
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gsk_path_measure_unref (measure);
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}
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else
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self->path = gsk_path_ref (self->orig_path);
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self->measure = gsk_path_measure_new (self->path);
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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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demo_widget_set_path (DemoWidget *self,
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GskPath *path)
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{
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g_clear_pointer (&self->orig_path, gsk_path_unref);
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self->orig_path = gsk_path_ref (path);
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update_path (self);
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}
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static void
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activate (GtkEntry *entry,
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DemoWidget *demo)
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{
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GskPath *path;
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path = gsk_path_parse (gtk_editable_get_text (GTK_EDITABLE (entry)));
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if (path)
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{
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demo_widget_set_path (demo, path);
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gsk_path_unref (path);
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}
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}
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static void
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init_demo (DemoWidget *demo,
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GtkEditable *editable)
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{
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GskPathBuilder *builder;
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GskPath *path;
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char *string;
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_circle (builder, &GRAPHENE_POINT_INIT (150, 150), 100);
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gsk_path_builder_add_rect (builder, 100, 100, 100, 100);
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gsk_path_builder_move_to (builder, 300, 150);
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gsk_path_builder_curve_to (builder, 300, 50, 400, 50, 400, 150);
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gsk_path_builder_curve_to (builder, 400, 250, 500, 250, 500, 150);
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path = gsk_path_builder_free_to_path (builder);
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demo_widget_set_path (demo, path);
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string = gsk_path_to_string (path);
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gtk_editable_set_text (editable, string);
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g_free (string);
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gsk_path_unref (path);
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}
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static void
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track_toggled (GtkCheckButton *button,
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DemoWidget *self)
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{
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self->track = gtk_check_button_get_active (button);
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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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bb_toggled (GtkCheckButton *button,
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DemoWidget *self)
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{
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self->show_bounding_box = gtk_check_button_get_active (button);
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gtk_widget_queue_draw (GTK_WIDGET (self));
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}
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static GtkWidget *start_scale;
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static GtkWidget *end_scale;
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static void
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range_changed (GtkRange *range,
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DemoWidget *self)
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{
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double start, end;
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if (range == GTK_RANGE (start_scale))
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{
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start = gtk_range_get_value (range);
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end = MAX (start, gtk_range_get_value (GTK_RANGE (end_scale)));
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gtk_range_set_value (GTK_RANGE (end_scale), end);
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}
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else
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{
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end = gtk_range_get_value (range);
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start = MIN (end, gtk_range_get_value (GTK_RANGE (start_scale)));
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gtk_range_set_value (GTK_RANGE (start_scale), start);
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}
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self->start = start;
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self->end = end;
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update_path (self);
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}
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int
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main (int argc, char *argv[])
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{
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GtkWidget *window, *box, *demo, *entry;
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GtkWidget *popover, *button, *grid;
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GtkWidget *header, *toggle;
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gtk_init ();
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window = gtk_window_new ();
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gtk_window_set_default_size (GTK_WINDOW (window), 600, 400);
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box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
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gtk_window_set_child (GTK_WINDOW (window), box);
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demo = demo_widget_new ();
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gtk_widget_set_hexpand (demo, TRUE);
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gtk_widget_set_vexpand (demo, TRUE);
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gtk_box_append (GTK_BOX (box), demo);
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header = gtk_header_bar_new ();
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button = gtk_menu_button_new ();
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gtk_menu_button_set_icon_name (GTK_MENU_BUTTON (button), "emblem-system-symbolic");
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gtk_header_bar_pack_start (GTK_HEADER_BAR (header), button);
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gtk_window_set_titlebar (GTK_WINDOW (window), header);
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popover = gtk_popover_new ();
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gtk_menu_button_set_popover (GTK_MENU_BUTTON (button), popover);
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grid = gtk_grid_new ();
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gtk_grid_set_row_spacing (GTK_GRID (grid), 6);
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gtk_grid_set_column_spacing (GTK_GRID (grid), 6);
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gtk_popover_set_child (GTK_POPOVER (popover), grid);
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toggle = gtk_check_button_new_with_label ("Show closest point");
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g_signal_connect (toggle, "toggled", G_CALLBACK (track_toggled), demo);
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gtk_grid_attach (GTK_GRID (grid), toggle, 0, 0, 1, 1);
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toggle = gtk_check_button_new_with_label ("Show bounding box");
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g_signal_connect (toggle, "toggled", G_CALLBACK (bb_toggled), demo);
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gtk_grid_attach (GTK_GRID (grid), toggle, 0, 1, 1, 1);
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entry = gtk_entry_new ();
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g_signal_connect (entry, "activate", G_CALLBACK (activate), demo);
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gtk_box_append (GTK_BOX (box), entry);
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start_scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 0, 1, 0.1);
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g_signal_connect (start_scale, "value-changed", G_CALLBACK (range_changed), demo);
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gtk_box_append (GTK_BOX (box), start_scale);
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end_scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 0, 1, 0.1);
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gtk_range_set_value (GTK_RANGE (end_scale), 1);
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g_signal_connect (end_scale, "value-changed", G_CALLBACK (range_changed), demo);
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gtk_box_append (GTK_BOX (box), end_scale);
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init_demo (DEMO_WIDGET (demo), GTK_EDITABLE (entry));
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gtk_window_present (GTK_WINDOW (window));
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while (g_list_model_get_n_items (gtk_window_get_toplevels ()) > 0)
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g_main_context_iteration (NULL, TRUE);
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return 0;
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}
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