diff options
| -rw-r--r-- | demos/gtk-demo/event_axes.c | 56 |
1 files changed, 55 insertions, 1 deletions
diff --git a/demos/gtk-demo/event_axes.c b/demos/gtk-demo/event_axes.c index 9ec163bb6d..a5f1895727 100644 --- a/demos/gtk-demo/event_axes.c +++ b/demos/gtk-demo/event_axes.c @@ -206,7 +206,7 @@ draw_axes_info (cairo_t *cr, AxesInfo *info, GtkAllocation *allocation) { - gdouble pressure, tilt_x, tilt_y, distance, wheel; + gdouble pressure, tilt_x, tilt_y, distance, wheel, rotation, slider; GdkAxisFlags axes = gdk_device_get_axes (info->last_source); cairo_save (cr); @@ -300,6 +300,60 @@ draw_axes_info (cairo_t *cr, cairo_restore (cr); } + if (axes & GDK_AXIS_FLAG_ROTATION) + { + gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_ROTATION, + &rotation); + rotation *= 2 * G_PI; + + cairo_save (cr); + cairo_rotate (cr, - G_PI / 2); + cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND); + cairo_set_line_width (cr, 5); + + cairo_new_sub_path (cr); + cairo_arc (cr, 0, 0, 100, 0, rotation); + cairo_stroke (cr); + cairo_restore (cr); + } + + if (axes & GDK_AXIS_FLAG_SLIDER) + { + cairo_pattern_t *pattern, *mask; + + gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_SLIDER, + &slider); + + cairo_save (cr); + + cairo_move_to (cr, 0, -10); + cairo_rel_line_to (cr, 0, -50); + cairo_rel_line_to (cr, 10, 0); + cairo_rel_line_to (cr, -5, 50); + cairo_close_path (cr); + + cairo_clip_preserve (cr); + + pattern = cairo_pattern_create_linear (0, -10, 0, -60); + cairo_pattern_add_color_stop_rgb (pattern, 0, 0, 1, 0); + cairo_pattern_add_color_stop_rgb (pattern, 1, 1, 0, 0); + cairo_set_source (cr, pattern); + cairo_pattern_destroy (pattern); + + mask = cairo_pattern_create_linear (0, -10, 0, -60); + cairo_pattern_add_color_stop_rgba (mask, 0, 0, 0, 0, 1); + cairo_pattern_add_color_stop_rgba (mask, slider, 0, 0, 0, 1); + cairo_pattern_add_color_stop_rgba (mask, slider, 0, 0, 0, 0); + cairo_pattern_add_color_stop_rgba (mask, 1, 0, 0, 0, 0); + cairo_mask (cr, mask); + cairo_pattern_destroy (mask); + + cairo_set_source_rgb (cr, 0, 0, 0); + cairo_stroke (cr); + + cairo_restore (cr); + } + cairo_restore (cr); } |