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1 #include <iostream.h>
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375
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2 #include <math.h>
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3 #include "SceneGraphRoot.h"
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4 #include "SGList.h"
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5
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6 #define FALSE 0
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7 #define TRUE !FALSE
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8 #define CHAIN_LEN 50
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9
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10 static double m = 100.0;
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11 static double k = 7000.0;
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12 static double g = 9.8;
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13 static double dt = 0.003;
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14 static double chain_width = 10;
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15 static double safe = 0.995;
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16
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17 typedef struct {
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18 double x, y, next_x, next_y;
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19 double vx, vy, next_vx, next_vy;
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20 int can_move;
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21 } CHAIN_VARS;
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22
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23 CHAIN_VARS cv[CHAIN_LEN];
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24
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25 void
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26 init_chain_vars(CHAIN_VARS *cv) {
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27 cv->x = 0, cv->y = 0, cv->next_x = 0, cv->next_y = 0;
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28 cv->vx = 0, cv->vy = 0, cv->next_vx = 0, cv->next_vy = 0;
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29 cv->can_move = TRUE;
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30 }
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31
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32 void
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33 set_vector(CHAIN_VARS *cv, SceneGraphPtr sg) {
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34 sg->xyz[0] = (float)cv->next_x;
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35 sg->xyz[1] = (float)cv->next_y;
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36 sg->xyz[2] = 0.0f;
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37 }
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38
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39
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40 static void
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41 chain_move_ope(SceneGraphPtr node, int screen_w, int screen_h)
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42 {
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43 Pad *pad = sgroot->getController();
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44
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45 if (pad->circle.isHold()) {
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46 cv[CHAIN_LEN-1].can_move = FALSE;
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47 if (pad->left.isHold()) {
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48 cv[CHAIN_LEN-1].x += -5.0;
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49 } else if (pad->right.isHold()) {
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50 cv[CHAIN_LEN-1].x += 5.0;
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51 }
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52
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53 if (pad->up.isHold()) {
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54 cv[CHAIN_LEN-1].y += -5.0;
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55 } else if (pad->down.isHold()) {
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56 cv[CHAIN_LEN-1].y += 5.0;
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57 }
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58 } else {
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59 cv[CHAIN_LEN-1].can_move = TRUE;
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60 }
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61 }
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62
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63 void
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64 chain_move(SceneGraphPtr sg, int w, int h)
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65 {
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66 int id = sg->id;
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67 if(id == 0) {
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68 for(int cnt = 0; cnt < 600; cnt++) {
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69 for(int i = 0; i < CHAIN_LEN; i++) {
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70 if(cv[i].can_move) {
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71 double dx = cv[i-1].x - cv[i].x;
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72 double dy = cv[i-1].y - cv[i].y;
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73 double l = sqrt(dx * dx + dy * dy);
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74 double a = k * (l - chain_width) / m;
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75 double ax = a * dx / l;
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76 double ay = a * dy / l;
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77 if(i < CHAIN_LEN - 1) {
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78 dx = cv[i+1].x - cv[i].x;
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79 dy = cv[i+1].y - cv[i].y;
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80 l = sqrt(dx * dx + dy * dy);
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81 a = k * (l - chain_width) / m;
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82 ax += a * dx / l;
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83 ay += a * dy / l;
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84 }
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85 ay += g;
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86 cv[i].vx *= safe;
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87 cv[i].vy *= safe;
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88 cv[i].next_vx = cv[i].vx + ax * dt;
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89 cv[i].next_vy = cv[i].vy + ay * dt;
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90 cv[i].next_x = cv[i].x + cv[i].vx * dt;
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91 cv[i].next_y = cv[i].y + cv[i].vy * dt;
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92 } else {
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93 cv[i].next_x = cv[i].x;
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94 cv[i].next_y = cv[i].y;
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95 }
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96 }
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97 for(int i = 0; i < CHAIN_LEN; i++) {
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98 cv[i].vx = cv[i].next_vx;
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99 cv[i].vy = cv[i].next_vy;
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100 cv[i].x = cv[i].next_x;
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101 cv[i].y = cv[i].next_y;
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102 }
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103 }
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104 // cout << id << ", " << sg->xyz[1] << endl;
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105 }
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106 set_vector(&cv[id], sg);
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107 int p, n;
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108 p = n = id;
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109 if(p != 0) {
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110 p--;
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111 }
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112 if(n != CHAIN_LEN - 1) {
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113 n++;
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114 }
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115 sg->angle[2-(id%2)*2]
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116 = 90 + atan((cv[p].next_y - cv[n].next_y) / (cv[p].next_x - cv[n].next_x)) * 180 / M_PI;
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117 }
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118
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119 void
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120 chain_collision(SceneGraphPtr sg, int w, int h, SceneGraphPtr osg)
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121 {
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122
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123 }
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124
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125 void
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126 chain_init(int w, int h)
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127 {
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128 SceneGraphPtr root_chain, chain;
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129 CHAIN_VARS rcv;
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130
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131 sgroot->createFromXMLfile("xml_file/chain.xml");
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132
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133 root_chain = sgroot->createSceneGraph(CHAIN);
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134 root_chain->set_move_collision(chain_move_ope, chain_collision);
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135 init_chain_vars(&rcv);
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136 rcv.next_x = w / 2;
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137 rcv.next_y = 0.0;
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138 set_vector(&rcv, root_chain);
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139
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140 for(int i = 0; i < CHAIN_LEN; i++) {
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141 chain = sgroot->createSceneGraph(CHAIN);
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142 chain->id = i;
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143 init_chain_vars(&cv[i]);
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144 cv[i].x = 0;
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145 cv[i].y = chain_width * i;
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146 set_vector(&cv[i], chain);
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147 chain->angle[1] = -90 * (i % 2);
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148 chain->set_move_collision(chain_move, chain_collision);
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149
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150 root_chain->addChild(chain);
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151 }
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152 cv[0].can_move = FALSE;
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153
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154 sgroot->setSceneData(root_chain);
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155 }
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