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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.Plink;
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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 std.math;
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11
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12 static cpSpace *space;
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13
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14 // Iterate over all of the bodies and reset the ones that have fallen offscreen.
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15 static void
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16 eachBody(cpBody *_body, void *unused)
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17 {
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18 if(_body.p.y < -260 || cpfabs(_body.p.x) > 340){
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19 cpFloat x = frand()*640 - 320;
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20 _body.p = cpv(x, 260);
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21 }
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22 }
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23
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24 static void
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25 update(int ticks)
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26 {
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27 int steps = 1;
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28 cpFloat dt = 1.0f/60.0f/cast(cpFloat)steps;
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29
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30 for(int i=0; i<steps; i++){
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31 cpSpaceStep(space, dt);
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32 cpSpaceEachBody(space, &eachBody, null);
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33 }
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34 }
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35
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36 enum NUM_VERTS = 5;
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37
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38 static cpSpace *
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39 init()
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40 {
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41 cpResetShapeIdCounter();
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42
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43 space = cpSpaceNew();
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44 space.iterations = 5;
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45 space.gravity = cpv(0, -100);
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46
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47 cpSpaceResizeStaticHash(space, 40.0f, 999);
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48 cpSpaceResizeActiveHash(space, 30.0f, 2999);
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49
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50 cpBody *_body;
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51 cpBody *staticBody = &space.staticBody;
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52 cpShape *shape;
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53
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54 // Create vertexes for a pentagon shape.
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55 cpVect verts[NUM_VERTS];
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56 for(int i=0; i<NUM_VERTS; i++){
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57 cpFloat angle = -2.0f*PI*i/(cast(cpFloat) NUM_VERTS);
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58 verts[i] = cpv(10.0f*cos(angle), 10.0f*sin(angle));
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59 }
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60
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61 // Vertexes for a triangle shape.
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62 enum cpVect tris[] = [
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63 cpv(-15,-15),
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64 cpv( 0, 10),
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65 cpv( 15,-15),
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66 ];
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67
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68 int foo;
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69
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70 // Create the static triangles.
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71 foreach(i; 0..9){
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72 foreach(j; 0..6){
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73 cpFloat stagger = (j%2)*40;
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74 cpVect offset;
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75 offset.x = (i*80) - 320 + stagger;
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76 offset.y = (j*70) - 240;
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77 //BUG: crazy fucking dmd codegen bug when optimizing (2.050)
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78 foo = i;
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79
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80 shape = cpSpaceAddShape(space, cpPolyShapeNew(staticBody, 3, tris.ptr, offset));
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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 }
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85
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86 // Add lots of pentagons.
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87 for(int i=0; i<300; i++){
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88 _body = cpSpaceAddBody(space, cpBodyNew(1.0f, cpMomentForPoly(1.0f, NUM_VERTS, verts.ptr, cpvzero)));
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89 cpFloat x = frand()*640 - 320;
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90 _body.p = cpv(x, 350);
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91
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92 shape = cpSpaceAddShape(space, cpPolyShapeNew(_body, NUM_VERTS, verts.ptr, cpvzero));
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93 shape.e = 0.0f; shape.u = 0.4f;
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94 }
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95
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96 return space;
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97 }
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98
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99 static void
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100 destroy()
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101 {
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102 cpSpaceFreeChildren(space);
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103 cpSpaceFree(space);
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104 }
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105
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106 chipmunkDemo Plink = {
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107 "Plink",
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108 null,
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109 &init,
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110 &update,
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111 &destroy,
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112 };
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