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demos: Show slider/rotation axes in "Event axes" demo

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This commit is contained in:
Carlos Garnacho 2016-04-08 17:25:53 +02:00
parent 057ae4ace0
commit f1cbd9ca13
1 changed files with 55 additions and 1 deletions
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56
demos/gtk-demo/event_axes.c
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@ -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);
}