mirror of
https://github.com/MarlinFirmware/Marlin.git
synced 2024-11-25 04:48:31 +00:00
82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/*
|
|
|
|
u8g_line.h
|
|
|
|
Universal 8bit Graphics Library
|
|
|
|
Copyright (c) 2012, olikraus@gmail.com
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without modification,
|
|
are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice, this list
|
|
of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright notice, this
|
|
list of conditions and the following disclaimer in the documentation and/or other
|
|
materials provided with the distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
|
|
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
|
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
|
|
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
#include "u8g.h"
|
|
|
|
void u8g_DrawLine(u8g_t *u8g, u8g_uint_t x1, u8g_uint_t y1, u8g_uint_t x2, u8g_uint_t y2)
|
|
{
|
|
u8g_uint_t tmp;
|
|
u8g_uint_t x,y;
|
|
u8g_uint_t dx, dy;
|
|
u8g_int_t err;
|
|
u8g_int_t ystep;
|
|
|
|
uint8_t swapxy = 0;
|
|
|
|
/* no BBX intersection check at the moment, should be added... */
|
|
|
|
if ( x1 > x2 ) dx = x1-x2; else dx = x2-x1;
|
|
if ( y1 > y2 ) dy = y1-y2; else dy = y2-y1;
|
|
|
|
if ( dy > dx )
|
|
{
|
|
swapxy = 1;
|
|
tmp = dx; dx =dy; dy = tmp;
|
|
tmp = x1; x1 =y1; y1 = tmp;
|
|
tmp = x2; x2 =y2; y2 = tmp;
|
|
}
|
|
if ( x1 > x2 )
|
|
{
|
|
tmp = x1; x1 =x2; x2 = tmp;
|
|
tmp = y1; y1 =y2; y2 = tmp;
|
|
}
|
|
err = dx >> 1;
|
|
if ( y2 > y1 ) ystep = 1; else ystep = -1;
|
|
y = y1;
|
|
for( x = x1; x <= x2; x++ )
|
|
{
|
|
if ( swapxy == 0 )
|
|
u8g_DrawPixel(u8g, x, y);
|
|
else
|
|
u8g_DrawPixel(u8g, y, x);
|
|
err -= (uint8_t)dy;
|
|
if ( err < 0 )
|
|
{
|
|
y += (u8g_uint_t)ystep;
|
|
err += (u8g_uint_t)dx;
|
|
}
|
|
}
|
|
}
|