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annotate dmlineclip.h @ 264:200329bb7688

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Fix the Cohen-Sutherland clipping implementation and add optional compile-time debugging.
author Matti Hamalainen <ccr@tnsp.org>
date Wed, 10 Oct 2012 13:02:35 +0300
parents 9d015d32841a
children 51ba74f7668c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
264
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1 /* Clip line coordinates. Return value:
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2 * = 0 : No clipping needed.
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3 * > 0 : Clipped. Line partially inside the clipping area.
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4 * < 0 : Line completely outside the clipping area.
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5 */
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6
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7 #ifndef DM_HEADER
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8 #define DM_CLIP_BITS(QB, QX, QY) \
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9 do { \
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10 QB = 0; \
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11 if (QX < clipX0) QB |= CLIP_LEFT; \
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12 else \
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13 if (QX > clipX1) QB |= CLIP_RIGHT; \
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14 \
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15 if (QY < clipY0) QB |= CLIP_TOP; \
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16 else \
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17 if (QY > clipY1) QB |= CLIP_BOTTOM; \
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18 } while (0)
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19
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20 #define xA (*x0)
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21 #define xB (*x1)
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22 #define yA (*y0)
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23 #define yB (*y1)
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24 #endif
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25
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26 #ifdef DM_CLIP_DEBUG
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27 #define CLIPDEB(fmt, ...) fprintf(stderr, fmt, __VA_ARGS__)
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28 #else
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29 #define CLIPDEB(fmt, ...)
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30 #endif
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31
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32 int DM_CLIP_FUNC (SDL_Surface *screen, DM_COORD_TYPE *x0, DM_COORD_TYPE *y0, DM_COORD_TYPE *x1, DM_COORD_TYPE *y1)
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33 #ifdef DM_HEADER
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34 ;
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35 #else
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36 {
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37 const DM_COORD_TYPE
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38 clipX0 = screen->clip_rect.x,
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39 clipY0 = screen->clip_rect.y,
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40 clipX1 = clipX0 + screen->clip_rect.w - 1,
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41 clipY1 = clipY0 + screen->clip_rect.h - 1;
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42
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43 int clipA, clipB;
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44
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45 DM_CLIP_BITS(clipA, xA, yA);
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46 DM_CLIP_BITS(clipB, xB, yB);
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47
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48 CLIPDEB("-- clip [%d, %d - %d, %d] --\n", xA, yA, xB, yB);
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49
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50 #if 1
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51 // The segment is inside?
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52 if ((clipA | clipB) == 0)
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53 return 0;
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54
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55 // The line segment is outside of the clip region
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56 if (clipA & clipB)
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57 return -1;
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58
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59 // Cohen-Sutherland clipping method
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60 do
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61 {
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62 const int c = clipA ? clipA : clipB;
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63 DM_COORD_TYPE x, y;
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64
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65 #ifdef DM_CLIP_DEBUG
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66 CLIPDEB "CLIP : ");
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67 if (c == clipA)
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68 CLIPDEB("A [%d, %d]\n", xA, yA);
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69 else
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70 CLIPDEB("B [%d, %d]\n", xB, yB);
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71 #endif
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72 if (c & CLIP_TOP)
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73 {
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74 x = xA + ((clipY0 - yA) * (xB - xA)) / (yB - yA);
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75 y = clipY0;
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76 CLIPDEB("TOP : %d, %d\n", x, y);
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77 }
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78 else
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79 if (c & CLIP_BOTTOM)
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80 {
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81 x = xA + ((clipY1 - yA) * (xB - xA)) / (yB - yA);
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82 y = clipY1;
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83 CLIPDEB("BOTTOM : %d, %d\n", x, y);
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84 }
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85 else
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86 if (c & CLIP_RIGHT)
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87 {
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88 y = yA + ((clipX1 - xA) * (yB - yA)) / (xB - xA);
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89 x = clipX1;
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90 CLIPDEB("RIGHT : %d, %d\n", x, y);
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91 }
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92 else
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93 {
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94 y = yA + ((clipX0 - xA) * (yB - yA)) / xB - xA;
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95 x = clipX0;
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96 CLIPDEB("LEFT : %d, %d\n", x, y);
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97 }
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98
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99 if (c == clipA)
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100 {
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101 xA = x;
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102 yA = y;
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103 DM_CLIP_BITS(clipA, xA, yA);
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104 }
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105 else
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106 {
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107 xB = x;
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108 yB = y;
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109 DM_CLIP_BITS(clipB, xB, yB);
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110 }
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111
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112 } while (clipA | clipB);
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113 #else
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114 // Buyu-Skala clipping method
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115 const DM_COORD_TYPE dx = xB - xA;
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116 const DM_COORD_TYPE dy = yB - yA;
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117 float k, m;
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118 int z;
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119
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120 switch (clipA + clipB)
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121 {
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122 case 1:
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123 if (clipA == 1)
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124 {
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125 xA = clipX0;
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126 yA = (clipX0 - xB) * dy / dx + yB;
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127 }
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128 else
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129 {
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130 xB = clipX0;
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parents:
diff changeset
131 yB = (clipX0 - xA) * dy / dx + yA;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
132 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
133 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
134
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
135 case 3:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
136 k = dy / dx;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
137 yA = (clipX0 - xA) * k + yA;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
138 xA = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
139 yB = (clipX1 - xB) * k + yB;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
140 xB = clipX1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
141 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
142
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
143 case 5:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
144 k = dy / dx;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
145 z = (clipX0 - xA) * k + yA;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
146 if (z < clipY0)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
147 {
262
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
148 switch (clipA)
232
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
149 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
150 case 0:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
151 xB = xB + (clipY0 - yB) / k;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
152 yB = clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
153 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
154 case 5:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
155 xA = xA + (clipY0 - yA) / k;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
156 yA = clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
157 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
158
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
159 default:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
160 return -1; /* the line segment is outside */
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
161 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
162 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
163 else
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
164 {
262
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
165 switch (clipA)
232
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
166 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
167 case 0:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
168 xB = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
169 yB = z;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
170 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
171 case 1:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
172 xB = xB + (clipY0 - yB) / k;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
173 yB = clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
174 xA = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
175 yA = z;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
176 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
177 case 4:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
178 xA = xA + (clipY0 - yA) / k;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
179 yA = clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
180 xB = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
181 yB = z;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
182 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
183 case 5:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
184 xA = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
185 yA = z;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
186 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
187 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
188 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
189 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
190
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
191 case 7:
262
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
192 switch (clipA)
232
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
193 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
194 case 1:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
195 k = dy / dx;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
196 yA = (clipX0 - xB) * k + yB;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
197 if (yA < clipY0)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
198 return -1; /* the line segment is outside */
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
199 xA = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
200 yB = (clipX1 - clipX0) * k + yA;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
201 if (yB < clipY0)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
202 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
203 xB = (clipY0 - yB) / k + clipX1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
204 yB = clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
205 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
206 else
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
207 xB = clipX1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
208 break;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
209
262
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
210 /* similarly for cases clipA == 2, 5, 6 */
232
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
211 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
212 case 15:
262
9d015d32841a Clean up the line clipping a bit, in preparation for fixes.
Matti Hamalainen <ccr@tnsp.org>
parents: 234
diff changeset
213 switch (clipA)
232
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
214 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
215 case 5:
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
216 if (dy * (clipX1 - clipX0) < dx * (clipY1 - clipY0))
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
217 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
218 k = dy / dx;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
219 yA = (clipX0 - xB) * k + yB;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
220 if (yA > clipY1)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
221 return -1; /* the line segment is outside */
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
222 yB = (clipX1 - clipX0) * k + yA;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
223 if (yB < clipY0)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
224 return -1; /* the line segment is outside */
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
225 if (yA < clipY0)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
226 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
227 xA = (clipY0 - yA) / k + clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
228 yA = clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
229 xB = clipX1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
230 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
231 else
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
232 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
233 xA = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
234 if (yB > clipY1)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
235 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
236 xB = (clipY1 - yB) / k + clipX1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
237 yB = clipY1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
238 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
239 else
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
240 xB = clipX1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
241 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
242 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
243 else
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
244 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
245 m = dx / dy;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
246 xA = (clipY0 - yB) * m + xB;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
247 if (xA > clipX1)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
248 return -1; /* the line segment is outside */
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
249 xB = (clipY1 - clipY0) * m + xA;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
250 if (xB < clipX0)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
251 return -1; /* the line segment is outside */
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
252 if (xA < clipX0)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
253 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
254 yA = (clipX0 - xA) / m + clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
255 xA = clipX0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
256 yB = clipY1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
257 }
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
258 else
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
259 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
260 yA = clipY0;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
261 if (xB > clipX1)
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
262 {
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
263 yB = (clipX1 - xB) / m + clipY1;
79dac918c81e Modularize line clipping etc. a lot, and export all line drawing and
Matti Hamalainen <ccr@tnsp.org>
parents:
diff changeset
264 xB = clipX1;
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265 }
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266 else
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267 yB = clipY1;
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268 }
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269 }
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270
262
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271 /* similarly for cases clipA == 6, 9, 10 */
232
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272 }
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273
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274 /* cases 2, 4, 8 are similar as case 1, cases 6, 9, 10 are similar as case 5 */
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275 /* cases 11, 13, 14 are similar as case 7, case 12 is similar case 3 */
262
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276 } /* of case clipA + clipB */
232
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277 #endif
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278
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279 return 1;
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280 }
262
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281
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282 #undef DM_CLIP_BITS
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283 #undef xA
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284 #undef xB
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285 #undef yA
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286 #undef yB
264
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287 #undef CLIPDEB
234
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288 #endif
232
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289
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290 #undef DM_CLIP_FUNC
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291 #undef DM_COORD_TYPE