389ff92cc1
* Makefile, Scripts: new linter * About: remove ID from IC * Firmware: remove double define for DIVC/DIVR * Scripts: check folder names too. Docker: replace syntax check with make lint. * Reformat Sources and Migrate to new file naming convention * Docker: symlink clang-format-12 to clang-format * Add coding style guide
103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
/*
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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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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)
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dx = x1 - x2;
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else
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dx = x2 - x1;
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if(y1 > y2)
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dy = y1 - y2;
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else
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dy = y2 - y1;
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if(dy > dx) {
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swapxy = 1;
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tmp = dx;
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dx = dy;
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dy = tmp;
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tmp = x1;
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x1 = y1;
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y1 = tmp;
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tmp = x2;
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x2 = y2;
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y2 = tmp;
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}
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if(x1 > x2) {
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tmp = x1;
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x1 = x2;
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x2 = tmp;
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tmp = y1;
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y1 = y2;
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y2 = tmp;
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}
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err = dx >> 1;
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if(y2 > y1)
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ystep = 1;
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else
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ystep = -1;
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y = y1;
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#ifndef U8G2_16BIT
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if(x2 == 255) x2--;
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#else
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if(x2 == 0xffff) x2--;
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#endif
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for(x = x1; x <= x2; x++) {
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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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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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