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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.Tank;
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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 static cpSpace *space;
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13
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14 static cpBody *tankBody;
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15 static cpBody *tankControlBody;
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16
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17 static void
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18 update(int ticks)
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19 {
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20 enum int steps = 1;
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21 enum cpFloat dt = 1.0f/60.0f/cast(cpFloat)steps;
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22
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23 for(int i=0; i<steps; i++){
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24 // turn the control _body based on the angle relative to the actual _body
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25 cpVect mouseDelta = cpvsub(mousePos, tankBody.p);
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26 cpFloat turn = cpvtoangle(cpvunrotate(tankBody.rot, mouseDelta));
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27 cpBodySetAngle(tankControlBody, tankBody.a - turn);
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28
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29 // drive the tank towards the mouse
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30 if(cpvnear(mousePos, tankBody.p, 30.0)){
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31 tankControlBody.v = cpvzero; // stop
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32 } else {
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33 cpFloat direction = (cpvdot(mouseDelta, tankBody.rot) > 0.0 ? 1.0 : -1.0);
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34 tankControlBody.v = cpvrotate(tankBody.rot, cpv(30.0f*direction, 0.0f));
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35 }
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36
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37 cpSpaceStep(space, dt);
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38 }
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39 }
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40
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41 static cpBody *
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42 add_box(cpFloat size, cpFloat mass)
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43 {
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44 cpVect verts[] = [
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45 cpv(-size,-size),
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46 cpv(-size, size),
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47 cpv( size, size),
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48 cpv( size,-size),
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49 ];
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50
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51 cpFloat radius = cpvlength(cpv(size, size));
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52
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53 cpBody *_body = cpSpaceAddBody(space, cpBodyNew(mass, cpMomentForPoly(mass, 4, verts.ptr, cpvzero)));
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54 _body.p = cpv(frand()*(640 - 2*radius) - (320 - radius), frand()*(480 - 2*radius) - (240 - radius));
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55
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56 cpShape *shape = cpSpaceAddShape(space, cpPolyShapeNew(_body, 4, verts.ptr, cpvzero));
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57 shape.e = 0.0f; shape.u = 0.7f;
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58
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59 return _body;
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60 }
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61
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62 static cpSpace *
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63 init()
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64 {
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65 cpResetShapeIdCounter();
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66
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67 space = cpSpaceNew();
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68 cpSpaceResizeActiveHash(space, 30.0f, 1000);
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69 space.iterations = 10;
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70 space.sleepTimeThreshold = 0.5f;
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71
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72 cpBody *staticBody = &space.staticBody;
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73 cpShape *shape;
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74
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75 // Create segments around the edge of the screen.
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76 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-320,-240), cpv(-320,240), 0.0f));
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77 shape.e = 1.0f; shape.u = 1.0f;
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78 shape.layers = NOT_GRABABLE_MASK;
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79
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80 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(320,-240), cpv(320,240), 0.0f));
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81 shape.e = 1.0f; shape.u = 1.0f;
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82 shape.layers = NOT_GRABABLE_MASK;
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83
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84 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-320,-240), cpv(320,-240), 0.0f));
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85 shape.e = 1.0f; shape.u = 1.0f;
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86 shape.layers = NOT_GRABABLE_MASK;
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87
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88 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-320,240), cpv(320,240), 0.0f));
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89 shape.e = 1.0f; shape.u = 1.0f;
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90 shape.layers = NOT_GRABABLE_MASK;
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91
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92 for(int i=0; i<50; i++){
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93 cpBody *_body = add_box(10.0, 1.0);
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94
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95 cpConstraint *pivot = cpSpaceAddConstraint(space, cpPivotJointNew2(staticBody, _body, cpvzero, cpvzero));
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96 pivot.biasCoef = 0.0f; // disable joint correction
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97 pivot.maxForce = 1000.0f; // emulate linear friction
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98
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99 cpConstraint *gear = cpSpaceAddConstraint(space, cpGearJointNew(staticBody, _body, 0.0f, 1.0f));
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100 gear.biasCoef = 0.0f; // disable joint correction
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101 gear.maxForce = 5000.0f; // emulate angular friction
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102 }
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103
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104 // We joint the tank to the control _body and control the tank indirectly by modifying the control _body.
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105 tankControlBody = cpBodyNew(INFINITY, INFINITY);
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106 tankBody = add_box(15.0, 10.0);
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107
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108 cpConstraint *pivot = cpSpaceAddConstraint(space, cpPivotJointNew2(tankControlBody, tankBody, cpvzero, cpvzero));
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109 pivot.biasCoef = 0.0f; // disable joint correction
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110 pivot.maxForce = 10000.0f; // emulate linear friction
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111
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112 cpConstraint *gear = cpSpaceAddConstraint(space, cpGearJointNew(tankControlBody, tankBody, 0.0f, 1.0f));
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113 gear.biasCoef = 1.0f; // limit angular correction rate
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114 gear.maxBias = 1.0f; // limit angular correction rate
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115 gear.maxForce = 500000.0f; // emulate angular friction
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116
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117 return space;
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118 }
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119
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120 static void
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121 destroy()
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122 {
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123 cpBodyFree(tankControlBody);
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124 cpSpaceFreeChildren(space);
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125 cpSpaceFree(space);
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126 }
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127
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128 chipmunkDemo Tank = {
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129 "Tank",
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130 null,
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131 &init,
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132 &update,
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133 &destroy,
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134 };
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