Mercurial > MadButterfly

annotate src/geo.c @ 1280:434f588fcde4

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Handle the change of attribute 'start' and 'end'. We do reset here. However, we should be able to optimize it latter to update the scenes directly.
author wycc
date Fri, 14 Jan 2011 00:00:11 +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
144
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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