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demo: Use pinch translation in the gestures demo

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Add the pinch translation offset to the pinch gesture demo. That allows
moving the square around in addition to the already-supported rotate and
zoom.
This commit is contained in:
Yariv Barkan
2019-12-14 11:27:44 +02:00
committed by Yariv Barkan
parent e229c6fe81
commit 1c050bdcf4
1 changed files with 4 additions and 3 deletions
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7
demos/gtk-demo/gestures.c
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@ -96,11 +96,12 @@ drawing_area_draw (GtkWidget *widget,
cairo_pattern_t *pat;
cairo_matrix_t matrix;
gdouble angle, scale;
gdouble x_center, y_center;
gtk_gesture_get_bounding_box_center (GTK_GESTURE (zoom), &x_center, &y_center);
cairo_get_matrix (cr, &matrix);
cairo_matrix_translate (&matrix,
allocation.width / 2,
allocation.height / 2);
cairo_matrix_translate (&matrix, x_center, y_center);
cairo_save (cr);