Tue, 08 Oct 2019 12:00:31 +0200
Initial import of the CO2 meter application.
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Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
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1 | /* |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
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2 | |
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Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
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3 | u8g2_box.c |
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4 | |
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5 | Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/) |
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Initial import of the CO2 meter application.
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6 | |
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Initial import of the CO2 meter application.
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7 | Copyright (c) 2016, olikraus@gmail.com |
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8 | All rights reserved. |
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9 | |
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10 | Redistribution and use in source and binary forms, with or without modification, |
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11 | are permitted provided that the following conditions are met: |
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12 | |
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13 | * Redistributions of source code must retain the above copyright notice, this list |
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14 | of conditions and the following disclaimer. |
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15 | |
88d965579617
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16 | * Redistributions in binary form must reproduce the above copyright notice, this |
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17 | list of conditions and the following disclaimer in the documentation and/or other |
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18 | materials provided with the distribution. |
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19 | |
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Michiel Broek <mbroek@mbse.eu>
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20 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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21 | CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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22 | INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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23 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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24 | DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
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25 | CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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26 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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27 | NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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28 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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29 | CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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30 | STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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31 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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32 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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33 | |
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34 | */ |
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35 | |
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36 | #include "u8g2.h" |
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37 | |
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38 | |
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39 | 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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40 | { |
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41 | u8g2_uint_t tmp; |
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42 | u8g2_uint_t x,y; |
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43 | u8g2_uint_t dx, dy; |
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44 | u8g2_int_t err; |
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45 | u8g2_int_t ystep; |
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46 | |
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47 | uint8_t swapxy = 0; |
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48 | |
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49 | /* no intersection check at the moment, should be added... */ |
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50 | |
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51 | if ( x1 > x2 ) dx = x1-x2; else dx = x2-x1; |
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52 | if ( y1 > y2 ) dy = y1-y2; else dy = y2-y1; |
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53 | |
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54 | if ( dy > dx ) |
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55 | { |
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56 | swapxy = 1; |
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57 | tmp = dx; dx =dy; dy = tmp; |
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58 | tmp = x1; x1 =y1; y1 = tmp; |
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59 | tmp = x2; x2 =y2; y2 = tmp; |
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60 | } |
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61 | if ( x1 > x2 ) |
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62 | { |
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63 | tmp = x1; x1 =x2; x2 = tmp; |
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64 | tmp = y1; y1 =y2; y2 = tmp; |
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65 | } |
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66 | err = dx >> 1; |
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67 | if ( y2 > y1 ) ystep = 1; else ystep = -1; |
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68 | y = y1; |
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69 | |
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70 | #ifndef U8G2_16BIT |
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71 | if ( x2 == 255 ) |
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72 | x2--; |
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73 | #else |
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74 | if ( x2 == 0xffff ) |
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75 | x2--; |
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76 | #endif |
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77 | |
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78 | for( x = x1; x <= x2; x++ ) |
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79 | { |
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80 | if ( swapxy == 0 ) |
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81 | u8g2_DrawPixel(u8g2, x, y); |
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82 | else |
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83 | u8g2_DrawPixel(u8g2, y, x); |
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84 | err -= (uint8_t)dy; |
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85 | if ( err < 0 ) |
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86 | { |
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87 | y += (u8g2_uint_t)ystep; |
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88 | err += (u8g2_uint_t)dx; |
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89 | } |
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90 | } |
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91 | } |
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92 |