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16
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1
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2 // written in the D programming language
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3
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4 module samples.Pump;
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5
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6 import chipmunkd.chipmunk;
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7
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8 import samples.ChipmunkDemo;
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9
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10 import gameApp;
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11
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12 import std.math;
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13
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14 enum M_PI = PI;
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15 enum M_PI_2 = PI*0.5f;
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16
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17 static cpSpace *space;
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18 static cpConstraint *motor;
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19
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20 enum numBalls = 5;
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21 static cpBody *balls[numBalls];
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22
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23 static void
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24 update(int ticks)
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25 {
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26 cpFloat coef = (2.0f + arrowDirection.y)/3.0f;
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27 cpFloat rate = arrowDirection.x*30.0f*coef;
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28
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29 cpSimpleMotorSetRate(motor, rate);
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30 motor.maxForce = (rate ? 1000000.0f : 0.0f);
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31
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32 enum int steps = 2;
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33 enum cpFloat dt = 1.0f/60.0f/cast(cpFloat)steps;
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34
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35 for(int i=0; i<steps; i++){
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36 cpSpaceStep(space, dt);
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37
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38 for(int j=0; j<numBalls; j++){
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39 cpBody *ball = balls[j];
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40 if(ball.p.x > 320.0f){
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41 ball.v = cpvzero;
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42 ball.p = cpv(-224.0f, 200.0f);
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43 }
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44 }
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45 }
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46 }
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47
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48 static cpBody *
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49 add_ball(cpVect pos)
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50 {
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51 cpBody *_body = cpSpaceAddBody(space, cpBodyNew(1.0f, cpMomentForCircle(1.0f, 30, 0, cpvzero)));
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52 _body.p = pos;
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53
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54 cpShape *shape = cpSpaceAddShape(space, cpCircleShapeNew(_body, 30, cpvzero));
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55 shape.e = 0.0f; shape.u = 0.5f;
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56
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57 return _body;
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58 }
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59
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60 static cpSpace *
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61 init()
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62 {
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63 space = cpSpaceNew();
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64 space.gravity = cpv(0, -600);
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65
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66 cpBody *staticBody = &space.staticBody;
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67 cpShape *shape;
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68
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69 // beveling all of the line segments slightly helps prevent things from getting stuck on cracks
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70 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-256,16), cpv(-256,300), 2.0f));
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71 shape.e = 0.0f; shape.u = 0.5f; shape.layers = 1;
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72 shape.layers = NOT_GRABABLE_MASK;
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73
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74 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-256,16), cpv(-192,0), 2.0f));
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75 shape.e = 0.0f; shape.u = 0.5f; shape.layers = 1;
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76 shape.layers = NOT_GRABABLE_MASK;
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77
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78 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-192,0), cpv(-192, -64), 2.0f));
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79 shape.e = 0.0f; shape.u = 0.5f; shape.layers = 1;
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80 shape.layers = NOT_GRABABLE_MASK;
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81
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82 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-128,-64), cpv(-128,144), 2.0f));
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83 shape.e = 0.0f; shape.u = 0.5f; shape.layers = 1;
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84 shape.layers = NOT_GRABABLE_MASK;
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85
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86 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-192,80), cpv(-192,176), 2.0f));
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87 shape.e = 0.0f; shape.u = 0.5f; shape.layers = 1;
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88 shape.layers = NOT_GRABABLE_MASK;
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89
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90 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-192,176), cpv(-128,240), 2.0f));
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91 shape.e = 0.0f; shape.u = 0.0f; shape.layers = 1;
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92 shape.layers = NOT_GRABABLE_MASK;
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93
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94 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-128,144), cpv(192,64), 2.0f));
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95 shape.e = 0.0f; shape.u = 0.5f; shape.layers = 1;
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96 shape.layers = NOT_GRABABLE_MASK;
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97
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98 cpVect verts[] = [
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99 cpv(-30,-80),
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100 cpv(-30, 80),
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101 cpv( 30, 64),
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102 cpv( 30,-80),
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103 ];
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104
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105 cpBody *plunger = cpSpaceAddBody(space, cpBodyNew(1.0f, INFINITY));
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106 plunger.p = cpv(-160,-80);
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107
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108 shape = cpSpaceAddShape(space, cpPolyShapeNew(plunger, 4, verts.ptr, cpvzero));
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109 shape.e = 1.0f; shape.u = 0.5f; shape.layers = 1;
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110
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111 // add balls to hopper
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112 for(int i=0; i<numBalls; i++)
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113 balls[i] = add_ball(cpv(-224 + i,80 + 64*i));
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114
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115 // add small gear
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116 cpBody *smallGear = cpSpaceAddBody(space, cpBodyNew(10.0f, cpMomentForCircle(10.0f, 80, 0, cpvzero)));
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117 smallGear.p = cpv(-160,-160);
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118 cpBodySetAngle(smallGear, cast(float)-M_PI_2);
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119
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120 shape = cpSpaceAddShape(space, cpCircleShapeNew(smallGear, 80.0f, cpvzero));
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121 shape.layers = 0;
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122
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123 cpSpaceAddConstraint(space, cpPivotJointNew2(staticBody, smallGear, cpv(-160,-160), cpvzero));
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124
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125 // add big gear
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126 cpBody *bigGear = cpSpaceAddBody(space, cpBodyNew(40.0f, cpMomentForCircle(40.0f, 160, 0, cpvzero)));
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127 bigGear.p = cpv(80,-160);
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128 cpBodySetAngle(bigGear, cast(float)M_PI_2);
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129
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130 shape = cpSpaceAddShape(space, cpCircleShapeNew(bigGear, 160.0f, cpvzero));
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131 shape.layers = 0;
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132
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133 cpSpaceAddConstraint(space, cpPivotJointNew2(staticBody, bigGear, cpv(80,-160), cpvzero));
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134
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135 // connect the plunger to the small gear.
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136 cpSpaceAddConstraint(space, cpPinJointNew(smallGear, plunger, cpv(80,0), cpv(0,0)));
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137 // connect the gears.
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138 cpSpaceAddConstraint(space, cpGearJointNew(smallGear, bigGear, -M_PI_2, -2.0f));
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139
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140
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141 // feeder mechanism
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142 cpFloat bottom = -300.0f;
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143 cpFloat top = 32.0f;
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144 cpBody *feeder = cpSpaceAddBody(space, cpBodyNew(1.0f, cpMomentForSegment(1.0f, cpv(-224.0f, bottom), cpv(-224.0f, top))));
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145 feeder.p = cpv(-224, (bottom + top)/2.0f);
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146
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147 cpFloat len = top - bottom;
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148 cpSpaceAddShape(space, cpSegmentShapeNew(feeder, cpv(0.0f, len/2.0f), cpv(0.0f, -len/2.0f), 20.0f));
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149
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150 cpSpaceAddConstraint(space, cpPivotJointNew2(staticBody, feeder, cpv(-224.0f, bottom), cpv(0.0f, -len/2.0f)));
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151 cpVect anchr = cpBodyWorld2Local(feeder, cpv(-224.0f, -160.0f));
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152 cpSpaceAddConstraint(space, cpPinJointNew(feeder, smallGear, anchr, cpv(0.0f, 80.0f)));
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153
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154 // motorize the second gear
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155 motor = cpSpaceAddConstraint(space, cpSimpleMotorNew(staticBody, bigGear, 3.0f));
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156
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157 return space;
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158 }
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159
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160 static void
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161 destroy()
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162 {
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163 cpSpaceFreeChildren(space);
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164 cpSpaceFree(space);
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165 }
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166
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167 chipmunkDemo Pump = {
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168 "Pump",
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169 null,
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170 &init,
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171 &update,
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172 &destroy,
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173 };
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