Mercurial > MadButterfly

annotate src/geo.c @ 1424:bd3d5ac8e748

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DOn't display unnecessary elemnts.
author wycc
date Sat, 09 Apr 2011 03:39:57 +0800
parents 586e50f82c1f
children
rev   line source
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1 // -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
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2 // vim: sw=4:ts=8:sts=4
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3 /*! \brief Determine who should be re-drawed.
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4 * \file
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5 * When part of graphic are chagned, not mater size, shape, or position,
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6 * the components effected or overlaid should be re-drawed. This module
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7 * figures out components that should be re-drawed.
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8 */
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9 #include <stdio.h>
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10 #include <string.h>
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11 #include "mb_types.h"
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12
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13 static int is_scale_overlay(co_aix x1, co_aix w1, co_aix x2, co_aix w2) {
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14 if(x1 > x2) {
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15 if((x1 - x2) >= w2)
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16 return 0;
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17 } else {
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18 if((x2 - x1) >= w1)
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19 return 0;
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20 }
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21 return 1;
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22 }
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23
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24 static int _areas_are_overlay(area_t *r1, area_t *r2) {
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25 if(is_scale_overlay(r1->x, r1->w, r2->x, r2->w) &&
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26 is_scale_overlay(r1->y, r1->h, r2->y, r2->h))
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27 return 1;
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28
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29 return 0;
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30 }
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31
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32 int areas_are_overlay(area_t *r1, area_t *r2) {
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33 return _areas_are_overlay(r1, r2);
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34 }
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35
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36 void area_init(area_t *area, int n_pos, co_aix pos[][2]) {
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37 co_aix min_x, max_x;
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38 co_aix min_y, max_y;
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39 co_aix x, y;
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40 int i;
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41
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42 /*! \note {x=0, y=0, w=0, h=0} geometry value for a n_pos=0 request
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43 * can prevent cursor flasing for Cairo XLib.
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44 * (see changeset 21db69d46835)
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45 */
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46 if(n_pos == 0) {
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47 area->x = 0;
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48 area->w = 0;
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49 area->y = 0;
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50 area->h = 0;
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51 return;
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52 }
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53
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54 min_x = max_x = pos[0][0];
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55 min_y = max_y = pos[0][1];
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56 for(i = 1; i < n_pos; i++) {
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57 x = pos[i][0];
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58 if(x < min_x)
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59 min_x = x;
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60 else if(x > max_x)
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61 max_x = x;
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62 y = pos[i][1];
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63 if(y < min_y)
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64 min_y = y;
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65 else if(y > max_y)
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66 max_y = y;
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67 }
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68
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69 area->x = min_x;
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70 area->w = max_x - min_x + 1;
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71 area->y = min_y;
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72 area->h = max_y - min_y + 1;
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73 }
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74
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75 void geo_init(geo_t *g) {
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76 memset(g, 0, sizeof(geo_t));
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77 g->cur_area = g->areas;
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78 g->last_area = g->areas + 1;
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79 }
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80
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81 void geo_from_positions(geo_t *g, int n_pos, co_aix pos[][2]) {
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82 area_init(g->cur_area, n_pos, pos);
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83 }
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84
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85 void geo_mark_overlay(geo_t *g, int n_others, geo_t **others,
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86 int *n_overlays, geo_t **overlays) {
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87 int i, ov_idx;
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88
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89 ov_idx = 0;
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90 for(i = 0; i < n_others; i++) {
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91 if(_areas_are_overlay(g->cur_area, others[i]->cur_area))
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92 overlays[ov_idx++] = others[i];
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93 }
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94 *n_overlays = ov_idx;
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95 }
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96
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97
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98 #ifdef UNITTEST
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99
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100 #include <CUnit/Basic.h>
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101
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102 void test_geo_from_positions(void) {
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103 co_aix data[][2] = {
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104 {33, 25}, {49, 12},
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105 {14, 28}, {39, 56}};
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106 geo_t g;
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107
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108 geo_init(&g);
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109 geo_from_positions(&g, 4, data);
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110 CU_ASSERT(g.cur_area->x == 14);
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111 CU_ASSERT(g.cur_area->w == 36);
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112 CU_ASSERT(g.cur_area->y == 12);
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113 CU_ASSERT(g.cur_area->h == 45);
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114 }
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115
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116 void test_geo_mark_overlay(void) {
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117 geo_t _geos[3], *geos[3], *overlays[3];
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118 geo_t g;
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119 co_aix pos[2][2];
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120 int i, n_ov;
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121
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122 for(i = 0; i < 3; i++) {
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123 pos[0][0] = i * 50;
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124 pos[0][1] = i * 50;
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125 pos[1][0] = i * 50 + 55;
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126 pos[1][1] = i * 50 + 66;
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127 geo_init(_geos + i);
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128 geo_from_positions(_geos + i, 2, pos);
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129 geos[i] = _geos + i;
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130 }
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131 pos[0][0] = 88;
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132 pos[0][1] = 79;
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133 pos[1][0] = 88 + 70;
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134 pos[1][1] = 79 + 70;
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135 geo_init(&g);
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136 geo_from_positions(&g, 2, pos);
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137
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138 /* overlay with geos[1] and geos[2] */
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139 geo_mark_overlay(&g, 3, geos, &n_ov, overlays);
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140 CU_ASSERT(n_ov == 2);
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141 CU_ASSERT(overlays[0] == geos[1]);
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142 CU_ASSERT(overlays[1] == geos[2]);
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143
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144 /* right side of geos[1], and up side of geos[2] */
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145 pos[0][0] = 106;
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146 pos[0][1] = 51;
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147 pos[1][0] = 106 + 49;
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148 pos[1][1] = 51 + 49;
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149 geo_from_positions(&g, 2, pos);
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150 geo_mark_overlay(&g, 3, geos, &n_ov, overlays);
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151 CU_ASSERT(n_ov == 1);
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152 CU_ASSERT(overlays[0] == geos[2]);
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153 }
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154
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155 CU_pSuite get_geo_suite(void) {
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156 CU_pSuite suite;
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157
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158 suite = CU_add_suite("Suite_geo", NULL, NULL);
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159 CU_ADD_TEST(suite, test_geo_from_positions);
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160 CU_ADD_TEST(suite, test_geo_mark_overlay);
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161
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162 return suite;
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163 }
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164
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165 #endif