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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.
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Yariv Barkan 2019-12-14 11:27:44 +02:00 committed by Yariv Barkan
parent 00a488a5b5
commit 1a9b1f38a4
1 changed files with 4 additions and 1 deletions
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demos/gtk-demo/gestures.c
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@ -94,9 +94,12 @@ drawing_area_draw (GtkDrawingArea *area,
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, width / 2, height / 2);
cairo_matrix_translate (&matrix, x_center, y_center);
cairo_save (cr);