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annotate dmdrawline.h @ 570:a26636faa6b7

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Update copyright.
author Matti Hamalainen <ccr@tnsp.org>
date Sat, 05 Jan 2013 19:58:23 +0200
parents 51ba74f7668c
children cf7612c8de1f
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1 /*
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2 * DMLib
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3 * -- Simple Bresenham's style line drawing
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4 * Programmed and designed by Matti 'ccr' Hamalainen
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5 * (C) Copyright 2011-2012 Tecnic Software productions (TNSP)
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6 */
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8 int DM_DRAWLINE_NAME (SDL_Surface *screen, DMFloat fx0, DMFloat fy0, DMFloat fx1, DMFloat fy1, const Uint32 col
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9 #ifdef DM_DRAWLINE_ARGS
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10 DM_DRAWLINE_ARGS
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11 #endif
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12 )
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13 #ifdef DM_HEADER
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14 ;
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15 #else
0
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16 {
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17 int dx, dy, xstep, ystep;
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18 const int qpitch = screen->pitch / DM_DRAWLINE_DST_BYTES;
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19
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20 // Clipping
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21 if (dmClipLineCoordsFloat(screen, &fx0, &fy0, &fx1, &fy1) < 0)
0
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22 return -1;
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24 int x0 = fx0, y0 = fy0, x1 = fx1, y1 = fy1;
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25
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26 // Compute initial deltas
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27 dx = (x1 - x0) * 2;
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28 dy = (y1 - y0) * 2;
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30
0
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31 if (dx < 0)
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32 {
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33 dx = -dx;
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34 xstep = -1;
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35 }
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36 else
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37 xstep = 1;
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38
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39 if (dy < 0)
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40 {
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41 dy = -dy;
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42 ystep = -1;
0
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43 }
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44 else
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45 ystep = 1;
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46
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47 #ifndef DM_DRAWLINE_SPEC
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48 // Compute offsets
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49 y0 *= qpitch;
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50 y1 *= qpitch;
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51 ystep *= qpitch;
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52 #endif
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53
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54 #ifdef DM_DRAWLINE_INIT
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55 DM_DRAWLINE_INIT
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56 #endif
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57
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58 DM_DRAWLINE_DST_TYPE *pix = (DM_DRAWLINE_DST_TYPE *) screen->pixels;
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59
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60 // Continue based on which delta is larger
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61 if (dx > dy)
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62 {
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63 int afrac = dy - (dx / 2.0);
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64 while (x0 != x1)
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65 {
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66 if (afrac >= 0)
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67 {
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68 y0 += ystep;
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69 afrac -= dx;
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70 }
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71
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72 x0 += xstep;
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73 afrac += dy;
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74
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75 DM_DRAWLINE_INNER
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76 }
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77 }
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78 else
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79 {
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80 int afrac = dx - (dy / 2.0);
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81 while (y0 != y1)
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82 {
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83 if (afrac >= 0)
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84 {
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85 x0 += xstep;
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86 afrac -= dy;
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87 }
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88
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89 y0 += ystep;
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90 afrac += dx;
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91
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92 DM_DRAWLINE_INNER
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93 }
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94 }
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95
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96 return 0;
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97 }
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98 #endif
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99
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100 #undef DM_DRAWLINE_NAME
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101 #undef DM_DRAWLINE_ARGS
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102 #undef DM_DRAWLINE_DST_BYTES
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103 #undef DM_DRAWLINE_DST_TYPE
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104 #undef DM_DRAWLINE_INIT
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105 #undef DM_DRAWLINE_INNER