gp_circle_seg.h File Reference

A ring and circle drawing algorithms. More...

#include <core/gp_types.h>

Go to the source code of this file.

Enumerations
enum	gp_circle_segments { GP_CIRCLE_SEG1 = 0x01 , GP_CIRCLE_SEG2 = 0x02 , GP_CIRCLE_SEG3 = 0x04 , GP_CIRCLE_SEG4 = 0x08 }
	Quadrants in the cartesian space. More...

Functions
void	gp_circle_seg (gp_pixmap *pixmap, gp_coord xcenter, gp_coord ycenter, gp_size r, uint8_t seg_flag, gp_pixel pixel)
	Draws a circle segment.
void	gp_fill_circle_seg (gp_pixmap *pixmap, gp_coord xcenter, gp_coord ycenter, gp_size r, uint8_t seg_flag, gp_pixel pixel)
	Draws a filled circle segment.
void	gp_fill_ring_seg (gp_pixmap *pixmap, gp_coord xcenter, gp_coord ycenter, gp_size r1, gp_size r2, uint8_t seg_flag, gp_pixel pixel)
	Draws a filled ring segment.

Detailed Description

A ring and circle drawing algorithms.

Definition in file gp_circle_seg.h.

Enumeration Type Documentation

gp_circle_segments

enum gp_circle_segments

Quadrants in the cartesian space.

The center is set in the middle of the circle. First segment is where both x and y are possitive, second is where only y is possitive, third is for both x and y negative and the last one for only y negative.

Note that on computer screen (and in in-memory bitmaps) cordinates for y grows in the opposite direction to the standard cartesian plane.

So first segment is actually down right, second is down left, third is up left, and fourth is up right.

Enumerator
GP_CIRCLE_SEG1	First Quadrant.
GP_CIRCLE_SEG2	Second Quadrant.
GP_CIRCLE_SEG3	Third Quadrant.
GP_CIRCLE_SEG4	Fourth Quadrant.

Definition at line 31 of file gp_circle_seg.h.