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app: add gimp_cairo_rounded_rectangle() 

... which draws a rectangle with rounded corners.
This commit is contained in:
Ell 2018-03-07 05:32:25 -05:00
parent efa8040780
commit a6001f1941
2 changed files with 66 additions and 0 deletions
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60
app/core/gimp-cairo.c
View File

@ -35,6 +35,9 @@
#include "gimp-cairo.h"
#define REV (2.0 * G_PI)
static cairo_user_data_key_t surface_data_key = { 0, };
@ -124,6 +127,63 @@ gimp_cairo_arc (cairo_t *cr,
}
}
void
gimp_cairo_rounded_rectangle (cairo_t *cr,
gdouble x,
gdouble y,
gdouble width,
gdouble height,
gdouble corner_radius)
{
g_return_if_fail (cr != NULL);
if (width < 0.0)
{
x += width;
width = -width;
}
if (height < 0.0)
{
y += height;
height = -height;
}
corner_radius = CLAMP (corner_radius, 0.0, MIN (width, height) / 2.0);
cairo_new_sub_path (cr);
cairo_arc (cr,
x + corner_radius, y + corner_radius,
corner_radius,
0.50 * REV, 0.75 * REV);
cairo_line_to (cr,
x + width - corner_radius, y);
cairo_arc (cr,
x + width - corner_radius, y + corner_radius,
corner_radius,
0.75 * REV, 1.00 * REV);
cairo_line_to (cr,
x + width, y + height - corner_radius);
cairo_arc (cr,
x + width - corner_radius, y + height - corner_radius,
corner_radius,
0.00 * REV, 0.25 * REV);
cairo_line_to (cr,
x + corner_radius, y + height);
cairo_arc (cr,
x + corner_radius, y + height - corner_radius,
corner_radius,
0.25 * REV, 0.50 * REV);
cairo_line_to (cr,
x, y + corner_radius);
cairo_close_path (cr);
}
void
gimp_cairo_segments (cairo_t *cr,
GimpSegment *segs,

6
app/core/gimp-cairo.h
View File

@ -37,6 +37,12 @@ void gimp_cairo_arc (cairo_t *cr,
gdouble radius,
gdouble start_angle,
gdouble slice_angle);
void gimp_cairo_rounded_rectangle (cairo_t *cr,
gdouble x,
gdouble y,
gdouble width,
gdouble height,
gdouble corner_radius);
void gimp_cairo_segments (cairo_t *cr,
GimpSegment *segs,
gint n_segs);