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comparison trunk/tests/ChipmunkDemos/samples/OneWay.d @ 16:af2f61a96318

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ported chipmunk demos
author Extrawurst
date Sat, 04 Dec 2010 02:02:29 +0100
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15:df4ebc8add66 16:af2f61a96318
1
2 // written in the D programming language
3
4 module samples.OneWay;
5
6 import chipmunkd.chipmunk;
7
8 import samples.ChipmunkDemo;
9
10 static cpSpace *space;
11
12 struct OneWayPlatform {
13 cpVect n; // direction objects may pass through
14 cpArray *passThruList; // list of objects passing through
15 }
16
17 static OneWayPlatform platformInstance;
18
19 static cpBool
20 preSolve(cpArbiter *arb, cpSpace *space, void *ignore)
21 {
22 mixin(CP_ARBITER_GET_SHAPES!("arb", "a", "b"));
23 OneWayPlatform *platform = cast(OneWayPlatform *)a.data;
24
25 if(cpvdot(cpArbiterGetNormal(arb, 0), platform.n) < 0){
26 cpArbiterIgnore(arb);
27 return cpFalse;
28 }
29
30 return cpTrue;
31 }
32
33 static void
34 update(int ticks)
35 {
36 int steps = 1;
37 cpFloat dt = 1.0f/60.0f/cast(cpFloat)steps;
38
39 for(int i=0; i<steps; i++){
40 cpSpaceStep(space, dt);
41 }
42 }
43
44 static cpSpace *
45 init()
46 {
47 cpResetShapeIdCounter();
48
49 space = cpSpaceNew();
50 space.iterations = 10;
51 space.gravity = cpv(0, -100);
52
53 cpBody *_body;
54 cpBody *staticBody = &space.staticBody;
55 cpShape *shape;
56
57 // Create segments around the edge of the screen.
58 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-320,-240), cpv(-320,240), 0.0f));
59 shape.e = 1.0f; shape.u = 1.0f;
60 shape.layers = NOT_GRABABLE_MASK;
61
62 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(320,-240), cpv(320,240), 0.0f));
63 shape.e = 1.0f; shape.u = 1.0f;
64 shape.layers = NOT_GRABABLE_MASK;
65
66 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-320,-240), cpv(320,-240), 0.0f));
67 shape.e = 1.0f; shape.u = 1.0f;
68 shape.layers = NOT_GRABABLE_MASK;
69
70 // Add our one way segment
71 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-160,-100), cpv(160,-100), 10.0f));
72 shape.e = 1.0f; shape.u = 1.0f;
73 shape.collision_type = 1;
74 shape.layers = NOT_GRABABLE_MASK;
75
76 // We'll use the data pointer for the OneWayPlatform struct
77 platformInstance.n = cpv(0, 1); // let objects pass upwards
78 platformInstance.passThruList = cpArrayNew(0);
79 shape.data = &platformInstance;
80
81
82 // Add a ball to make things more interesting
83 cpFloat radius = 15.0f;
84 _body = cpSpaceAddBody(space, cpBodyNew(10.0f, cpMomentForCircle(10.0f, 0.0f, radius, cpvzero)));
85 _body.p = cpv(0, -200);
86 _body.v = cpv(0, 170);
87
88 shape = cpSpaceAddShape(space, cpCircleShapeNew(_body, radius, cpvzero));
89 shape.e = 0.0f; shape.u = 0.9f;
90 shape.collision_type = 2;
91
92 cpSpaceAddCollisionHandler(space, 1, 2, null, &preSolve, null, null, null);
93
94 return space;
95 }
96
97 static void
98 destroy()
99 {
100 cpSpaceFreeChildren(space);
101 cpSpaceFree(space);
102
103 cpArrayFree(platformInstance.passThruList);
104 }
105
106 chipmunkDemo OneWay = {
107 "One Way Platforms",
108 null,
109 &init,
110 &update,
111 &destroy,
112 };