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92 lines
2.5 KiB
92 lines
2.5 KiB
/* |
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u8g2_box.c |
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Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/) |
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Copyright (c) 2016, olikraus@gmail.com |
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All rights reserved. |
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Redistribution and use in source and binary forms, with or without modification, |
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are permitted provided that the following conditions are met: |
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* Redistributions of source code must retain the above copyright notice, this list |
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of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright notice, this |
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list of conditions and the following disclaimer in the documentation and/or other |
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materials provided with the distribution. |
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "u8g2.h" |
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void u8g2_DrawLine(u8g2_t *u8g2, u8g2_uint_t x1, u8g2_uint_t y1, u8g2_uint_t x2, u8g2_uint_t y2) |
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{ |
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u8g2_uint_t tmp; |
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u8g2_uint_t x,y; |
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u8g2_uint_t dx, dy; |
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u8g2_int_t err; |
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u8g2_int_t ystep; |
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uint8_t swapxy = 0; |
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/* no intersection check at the moment, should be added... */ |
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if ( x1 > x2 ) dx = x1-x2; else dx = x2-x1; |
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if ( y1 > y2 ) dy = y1-y2; else dy = y2-y1; |
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if ( dy > dx ) |
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{ |
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swapxy = 1; |
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tmp = dx; dx =dy; dy = tmp; |
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tmp = x1; x1 =y1; y1 = tmp; |
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tmp = x2; x2 =y2; y2 = tmp; |
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} |
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if ( x1 > x2 ) |
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{ |
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tmp = x1; x1 =x2; x2 = tmp; |
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tmp = y1; y1 =y2; y2 = tmp; |
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} |
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err = dx >> 1; |
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if ( y2 > y1 ) ystep = 1; else ystep = -1; |
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y = y1; |
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#ifndef U8G2_16BIT |
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if ( x2 == 255 ) |
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x2--; |
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#else |
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if ( x2 == 0xffff ) |
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x2--; |
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#endif |
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for( x = x1; x <= x2; x++ ) |
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{ |
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if ( swapxy == 0 ) |
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u8g2_DrawPixel(u8g2, x, y); |
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else |
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u8g2_DrawPixel(u8g2, y, x); |
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err -= (uint8_t)dy; |
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if ( err < 0 ) |
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{ |
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y += (u8g2_uint_t)ystep; |
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err += (u8g2_uint_t)dx; |
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} |
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} |
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} |
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