glib_circle.c File Reference

Detailed Description

Silicon Labs Graphics Library: Circle Drawing Routines.

License

Copyright 2015 Silicon Labs, http://www.silabs.com

This file is licensensed under the Silabs License Agreement. See the file "Silabs_License_Agreement.txt" for details. Before using this software for any purpose, you must agree to the terms of that agreement.

Definition in file glib_circle.c.

#include <stdint.h>
#include "em_types.h"
#include "glib.h"

Go to the source code of this file.

Functions
EMSTATUS	GLIB_drawCircle (GLIB_Context_t *pContext, int32_t xCenter, int32_t yCenter, uint32_t radius)
	Draws a circle with center at x, y, and a radius. More...
EMSTATUS	GLIB_drawCircleFilled (GLIB_Context_t *pContext, int32_t xCenter, int32_t yCenter, uint32_t radius)
	Draws a filled circle with center at x, y, and a radius. More...
EMSTATUS	GLIB_drawPartialCircle (GLIB_Context_t *pContext, int32_t xCenter, int32_t yCenter, uint32_t radius, uint8_t bitMask)
	Draws a partial circle with center at x, y, and a radius. More...
static EMSTATUS	GLIB_drawPartialCirclePoints (GLIB_Context_t *pContext, int32_t xCenter, int32_t yCenter, int32_t x, int32_t y, uint8_t bitMask)
	Draws circle points using 8-way symmetry. More...

Function Documentation

static EMSTATUS GLIB_drawPartialCirclePoints ( GLIB_Context_t *  pContext, int32_t  xCenter, int32_t  yCenter, int32_t  x, int32_t  y, uint8_t  bitMask  )

static

Draws circle points using 8-way symmetry.

Example: bitMask = 4 draws only pixels in 3. octant (00000100). bitMask = 5 draws only pixels in 3. and 1. octant (00000101).

Parameters

pContext	Pointer to a GLIB_Context_t in which the circle is drawn. The circle is drawn using the foreground color.
xCenter	Center x-coordinate
yCenter	Center y-coordinate
x	x-coordinate of circle point
y	y-coordinate of circle point
bitMask	Bitmask which decides which octants pixels should be drawn The LSB is 1. octant, and the MSB is 8. octant. The octants are ordered from 1 to 8 in counterclockwise order.

Returns

• Returns GLIB_OK on succes.
• Returns GLIB_ERROR_NOTHING_TO_DRAW if none of the points were drawn
• Returns error code otherwise

Definition at line 218 of file glib_circle.c.

References GLIB_drawPixel(), GLIB_ERROR_NOTHING_TO_DRAW, and GLIB_OK.

Referenced by GLIB_drawPartialCircle().