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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.UnsafeOps;
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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 static cpSpace *space;
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15
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16 enum M_PI = PI;
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17 enum M_PI_2 = PI*0.5f;
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18
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19 enum NUM_CIRCLES = 30;
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20
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21 static cpShape *circles[NUM_CIRCLES];
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22 static cpFloat circleRadius = 30.0f;
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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 if(arrowDirection.y){
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28 circleRadius = cpfmax(10.0f, circleRadius + arrowDirection.y);
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29
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30 for(int i=0; i<NUM_CIRCLES; i++){
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31 circles[i]._body.m = cpMomentForCircle(1.0f, 0.0f, circleRadius, cpvzero);
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32 cpCircleShapeSetRadius(circles[i], circleRadius);
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33 }
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34 }
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35
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36 int steps = 1;
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37 cpFloat dt = 1.0f/60.0f/cast(cpFloat)steps;
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38
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39 for(int i=0; i<steps; i++){
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40 cpSpaceStep(space, dt);
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41 }
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42 }
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43
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44 static cpSpace *
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45 init()
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46 {
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47 cpResetShapeIdCounter();
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48
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49 space = cpSpaceNew();
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50 space.iterations = 5;
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51 space.gravity = cpv(0, -100);
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52
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53 cpSpaceResizeStaticHash(space, 40.0f, 999);
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54 cpSpaceResizeActiveHash(space, 30.0f, 2999);
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55
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56 cpBody *_body, staticBody = &space.staticBody;
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57 cpShape *shape;
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58
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59 shape = cpSpaceAddStaticShape(space, cpSegmentShapeNew(staticBody, cpv(-320,-240), cpv(-320,240), 0.0f));
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60 shape.e = 1.0f; shape.u = 1.0f;
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61 shape.layers = NOT_GRABABLE_MASK;
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62
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63 shape = cpSpaceAddStaticShape(space, cpSegmentShapeNew(staticBody, cpv(320,-240), cpv(320,240), 0.0f));
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64 shape.e = 1.0f; shape.u = 1.0f;
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65 shape.layers = NOT_GRABABLE_MASK;
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66
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67 shape = cpSpaceAddStaticShape(space, cpSegmentShapeNew(staticBody, cpv(-320,-240), cpv(320,-240), 0.0f));
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68 shape.e = 1.0f; shape.u = 1.0f;
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69 shape.layers = NOT_GRABABLE_MASK;
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70
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71 for(int i=0; i<NUM_CIRCLES; i++){
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72 _body = cpSpaceAddBody(space, cpBodyNew(1.0f, cpMomentForCircle(1.0f, 0.0f, circleRadius, cpvzero)));
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73 _body.p = cpvmult(cpv(frand()*2.0f - 1.0f, frand()*2.0f - 1.0f), circleRadius*5.0f);
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74
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75 circles[i] = shape = cpSpaceAddShape(space, cpCircleShapeNew(_body, circleRadius, cpvzero));
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76 shape.e = 0.0f; shape.u = 1.0f;
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77 }
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78
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79 //strcat(messageString,
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80 // "chipmunk_unsafe.h Contains functions for changing shapes, but they can cause severe stability problems if used incorrectly.\n"
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81 // "Shape changes occur as instantaneous changes to position without an accompanying velocity change. USE WITH CAUTION!");
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82 return space;
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83 }
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84
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85 static void
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86 destroy()
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87 {
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88 cpSpaceFreeChildren(space);
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89 cpSpaceFree(space);
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90 }
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91
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92 chipmunkDemo UnsafeOps = {
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93 "Unsafe Operations",
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94 null,
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95 &init,
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96 &update,
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97 &destroy,
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98 };
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