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gtk-demo: Work without stylus

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In the paint demo, don't assume that the event
backlog contains pressure. It won't, if we are
working with a plain old mouse.
This commit is contained in:
Matthias Clasen 2023-04-09 08:28:26 -04:00
parent 5970a14217
commit 7f906bef06
1 changed files with 4 additions and 2 deletions
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6
demos/gtk-demo/paint.c
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@ -263,7 +263,7 @@ drawing_area_apply_stroke (DrawingArea *area,
double y, double y,
double pressure) double pressure)
{ {
if (gdk_device_tool_get_tool_type (tool) == GDK_DEVICE_TOOL_TYPE_ERASER) if (tool && gdk_device_tool_get_tool_type (tool) == GDK_DEVICE_TOOL_TYPE_ERASER)
{ {
cairo_set_line_width (area->cr, 10 * pressure * area->brush_size); cairo_set_line_width (area->cr, 10 * pressure * area->brush_size);
cairo_set_operator (area->cr, CAIRO_OPERATOR_DEST_OUT); cairo_set_operator (area->cr, CAIRO_OPERATOR_DEST_OUT);
@ -314,7 +314,9 @@ stylus_gesture_motion (GtkGestureStylus *gesture,
drawing_area_apply_stroke (area, tool, drawing_area_apply_stroke (area, tool,
backlog[i].axes[GDK_AXIS_X], backlog[i].axes[GDK_AXIS_X],
backlog[i].axes[GDK_AXIS_Y], backlog[i].axes[GDK_AXIS_Y],
backlog[i].axes[GDK_AXIS_PRESSURE]); backlog[i].flags & GDK_AXIS_FLAG_PRESSURE
? backlog[i].axes[GDK_AXIS_PRESSURE]
: 1);
} }
g_free (backlog); g_free (backlog);