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Allow showing points in curve2 test

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This is useful for debugging intersections.
This commit is contained in:
Matthias Clasen
2022-03-21 00:17:46 -04:00
parent de29a01682
commit 3b04f5a963
1 changed files with 68 additions and 0 deletions
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68
tests/curve2.c
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@@ -18,6 +18,7 @@ struct _DemoWidget
gboolean track;
gboolean show_bounding_box;
gboolean show_points;
GtkWidget *label;
gboolean do_stroke;
@@ -105,6 +106,56 @@ demo_widget_init (DemoWidget *self)
gtk_widget_add_controller (GTK_WIDGET (self), controller);
}
static void
draw_point (GtkSnapshot *snapshot,
const graphene_point_t *pt)
{
graphene_rect_t bounds;
GdkRGBA color = { 1, 0, 0, 1 };
bounds.origin.x = pt->x - 2;
bounds.origin.y = pt->y - 2;
bounds.size.width = 4;
bounds.size.height = 4;
gtk_snapshot_append_color (snapshot, &color, &bounds);
}
static gboolean
point_cb (GskPathOperation op,
const graphene_point_t *pts,
gsize n_ts,
float weight,
gpointer user_data)
{
GtkSnapshot *snapshot = user_data;
switch (op)
{
case GSK_PATH_MOVE:
draw_point (snapshot, &pts[0]);
break;
case GSK_PATH_CLOSE:
draw_point (snapshot, &pts[0]);
break;
case GSK_PATH_LINE:
draw_point (snapshot, &pts[1]);
break;
case GSK_PATH_CURVE:
draw_point (snapshot, &pts[3]);
break;
case GSK_PATH_CONIC:
default:
g_assert_not_reached ();
}
return TRUE;
}
static void
demo_widget_snapshot (GtkWidget *widget,
GtkSnapshot *snapshot)
@@ -200,6 +251,11 @@ demo_widget_snapshot (GtkWidget *widget,
gtk_snapshot_pop (snapshot);
}
if (self->show_points)
{
gsk_path_foreach (self->path, GSK_PATH_FOREACH_ALLOW_CURVE, point_cb, snapshot);
}
if (self->show_bounding_box)
{
if (gsk_path_get_bounds (self->do_stroke ? self->outline_path : self->path, &bounds))
@@ -499,6 +555,14 @@ zoom_changed (GtkRange *range,
gtk_widget_queue_resize (GTK_WIDGET (self));
}
static void
points_toggled (GtkCheckButton *button,
DemoWidget *self)
{
self->show_points = gtk_check_button_get_active (button);
gtk_widget_queue_draw (GTK_WIDGET (self));
}
static void
track_toggled (GtkCheckButton *button,
DemoWidget *self)
@@ -775,6 +839,10 @@ main (int argc, char *argv[])
g_signal_connect (spin, "value-changed", G_CALLBACK (dash_offset_changed), demo);
gtk_grid_attach (GTK_GRID (grid), spin, 1, row++, 1, 1);
toggle = gtk_check_button_new_with_label ("Show points");
g_signal_connect (toggle, "toggled", G_CALLBACK (points_toggled), demo);
gtk_grid_attach (GTK_GRID (grid), toggle, 1, row++, 1, 1);
toggle = gtk_check_button_new_with_label ("Show closest point");
g_signal_connect (toggle, "toggled", G_CALLBACK (track_toggled), demo);
gtk_grid_attach (GTK_GRID (grid), toggle, 1, row++, 1, 1);