NAME¶
dtk_create_circle - Create and modify circular shape
SYNOPSIS¶
#include <drawtk.h>
dtk_hshape dtk_create_circle(dtk_hshape shp,
float cx, float cy, float r, int
filled,
const float *color, unsigned int numpoints);
DESCRIPTION¶
dtk_create_circle() creates an approximation of a circle of radius
r centered at (
cx,
cy) using
num_points vertices.
shp,
filled and
color have the same usage and meaning as
for other shape creation function:
- *
- shp can be used to modify a previously created shape. If it is
non-null, the handle will be used to modify the shape referenced by
shp: no new shape is created and the returned value is ensured to
be shp in case of success, NULL otherwise. If shp is
NULL, the function will attempt to create a new shape.
- *
- filled is set to 0 if the described shape should be a continuous
line or a non-null value if the shape is supposed to be filled
polygon.
- *
- color should point to a 4 float array containing a normalized RGBA
value (i.e. each component is between 0.0 and 1.0).
RETURN VALUE¶
In case of success these functions return the handle to the newly created or
modified shape. If the
shp argument is non-null, the handle returned is
the same value. In case of error,
NULL is returned.
SEE ALSO¶
dtk_destroy_shape(3)