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comparison trunk/tests/ChipmunkDemos/samples/Tank.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.Tank;
5
6 import chipmunkd.chipmunk;
7
8 import samples.ChipmunkDemo;
9
10 import gameApp;
11
12 static cpSpace *space;
13
14 static cpBody *tankBody;
15 static cpBody *tankControlBody;
16
17 static void
18 update(int ticks)
19 {
20 enum int steps = 1;
21 enum cpFloat dt = 1.0f/60.0f/cast(cpFloat)steps;
22
23 for(int i=0; i<steps; i++){
24 // turn the control _body based on the angle relative to the actual _body
25 cpVect mouseDelta = cpvsub(mousePos, tankBody.p);
26 cpFloat turn = cpvtoangle(cpvunrotate(tankBody.rot, mouseDelta));
27 cpBodySetAngle(tankControlBody, tankBody.a - turn);
28
29 // drive the tank towards the mouse
30 if(cpvnear(mousePos, tankBody.p, 30.0)){
31 tankControlBody.v = cpvzero; // stop
32 } else {
33 cpFloat direction = (cpvdot(mouseDelta, tankBody.rot) > 0.0 ? 1.0 : -1.0);
34 tankControlBody.v = cpvrotate(tankBody.rot, cpv(30.0f*direction, 0.0f));
35 }
36
37 cpSpaceStep(space, dt);
38 }
39 }
40
41 static cpBody *
42 add_box(cpFloat size, cpFloat mass)
43 {
44 cpVect verts[] = [
45 cpv(-size,-size),
46 cpv(-size, size),
47 cpv( size, size),
48 cpv( size,-size),
49 ];
50
51 cpFloat radius = cpvlength(cpv(size, size));
52
53 cpBody *_body = cpSpaceAddBody(space, cpBodyNew(mass, cpMomentForPoly(mass, 4, verts.ptr, cpvzero)));
54 _body.p = cpv(frand()*(640 - 2*radius) - (320 - radius), frand()*(480 - 2*radius) - (240 - radius));
55
56 cpShape *shape = cpSpaceAddShape(space, cpPolyShapeNew(_body, 4, verts.ptr, cpvzero));
57 shape.e = 0.0f; shape.u = 0.7f;
58
59 return _body;
60 }
61
62 static cpSpace *
63 init()
64 {
65 cpResetShapeIdCounter();
66
67 space = cpSpaceNew();
68 cpSpaceResizeActiveHash(space, 30.0f, 1000);
69 space.iterations = 10;
70 space.sleepTimeThreshold = 0.5f;
71
72 cpBody *staticBody = &space.staticBody;
73 cpShape *shape;
74
75 // Create segments around the edge of the screen.
76 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-320,-240), cpv(-320,240), 0.0f));
77 shape.e = 1.0f; shape.u = 1.0f;
78 shape.layers = NOT_GRABABLE_MASK;
79
80 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(320,-240), cpv(320,240), 0.0f));
81 shape.e = 1.0f; shape.u = 1.0f;
82 shape.layers = NOT_GRABABLE_MASK;
83
84 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-320,-240), cpv(320,-240), 0.0f));
85 shape.e = 1.0f; shape.u = 1.0f;
86 shape.layers = NOT_GRABABLE_MASK;
87
88 shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-320,240), cpv(320,240), 0.0f));
89 shape.e = 1.0f; shape.u = 1.0f;
90 shape.layers = NOT_GRABABLE_MASK;
91
92 for(int i=0; i<50; i++){
93 cpBody *_body = add_box(10.0, 1.0);
94
95 cpConstraint *pivot = cpSpaceAddConstraint(space, cpPivotJointNew2(staticBody, _body, cpvzero, cpvzero));
96 pivot.biasCoef = 0.0f; // disable joint correction
97 pivot.maxForce = 1000.0f; // emulate linear friction
98
99 cpConstraint *gear = cpSpaceAddConstraint(space, cpGearJointNew(staticBody, _body, 0.0f, 1.0f));
100 gear.biasCoef = 0.0f; // disable joint correction
101 gear.maxForce = 5000.0f; // emulate angular friction
102 }
103
104 // We joint the tank to the control _body and control the tank indirectly by modifying the control _body.
105 tankControlBody = cpBodyNew(INFINITY, INFINITY);
106 tankBody = add_box(15.0, 10.0);
107
108 cpConstraint *pivot = cpSpaceAddConstraint(space, cpPivotJointNew2(tankControlBody, tankBody, cpvzero, cpvzero));
109 pivot.biasCoef = 0.0f; // disable joint correction
110 pivot.maxForce = 10000.0f; // emulate linear friction
111
112 cpConstraint *gear = cpSpaceAddConstraint(space, cpGearJointNew(tankControlBody, tankBody, 0.0f, 1.0f));
113 gear.biasCoef = 1.0f; // limit angular correction rate
114 gear.maxBias = 1.0f; // limit angular correction rate
115 gear.maxForce = 500000.0f; // emulate angular friction
116
117 return space;
118 }
119
120 static void
121 destroy()
122 {
123 cpBodyFree(tankControlBody);
124 cpSpaceFreeChildren(space);
125 cpSpaceFree(space);
126 }
127
128 chipmunkDemo Tank = {
129 "Tank",
130 null,
131 &init,
132 &update,
133 &destroy,
134 };