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1 import chipmunkd.chipmunk;
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2
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3 import std.stdio;
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4
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5 void main()
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6 {
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7 // This allocated internal memory of the engine and must be
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8 // called befor any collision can occur otherwise things get ugly
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9 cpInitChipmunk();
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10
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11 // Create a space, a space is a simulation world. It simulates the motions of rigid bodies,
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12 // handles collisions between them, and simulates the joints between them.
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13 cpSpace* space = cpSpaceNew();
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14
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15
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16 // Lets set some parameters of the space:
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17 // More iterations make the simulation more accurate but slower
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18 space.iterations = 10;
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19 // These parameters tune the efficiency of the collision detection.
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20 // For more info: http://code.google.com/p/chipmunk-physics/wiki/cpSpace
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21 cpSpaceResizeStaticHash(space, 30.0f, 1000);
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22 cpSpaceResizeActiveHash(space, 30.0f, 1000);
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23 // Give it some gravity
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24 space.gravity = cpv(0, -1);
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25
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26
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27 // Create A ground segment along the bottom of the screen
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28 // By attaching it to &space.staticBody instead of a body, we make it a static shape.
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29 cpShape *ground = cpSegmentShapeNew(&space.staticBody, cpv(-320,-240), cpv(320,-240), 0.0f);
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30 // Set some parameters of the shape.
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31 // For more info: http://code.google.com/p/chipmunk-physics/wiki/cpShape
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32 ground.e = 1.0f; ground.u = 1.0f;
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33 // Add the shape to the space as a static shape
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34 // If a shape never changes position, add it as static so Chipmunk knows it only needs to
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35 // calculate collision information for it once when it is added.
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36 // Do not change the postion of a static shape after adding it.
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37 cpSpaceAddShape(space, ground);
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38
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39 // Add a moving circle object.
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40 cpFloat radius = 15.0f;
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41 cpFloat mass = 10.0f;
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42 // This time we need to give a mass and moment of inertia when creating the circle.
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43 cpBody *ballBody = cpBodyNew(mass, cpMomentForCircle(mass, 0.0f, radius, cpvzero));
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44 // Set some parameters of the body:
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45 // For more info: http://code.google.com/p/chipmunk-physics/wiki/cpBody
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46 ballBody.p = cpv(0, -100 + radius+50);
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47 ballBody.v = cpv(0, -20);
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48 // Add the body to the space so it will be simulated and move around.
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49 cpSpaceAddBody(space, ballBody);
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50
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51
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52 // Add a circle shape for the ball.
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53 // Shapes are always defined relative to the center of
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54 // gravity of the body they are attached to.
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55 // When the body moves or rotates, the shape will move with it.
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56 // Additionally, all of the cpSpaceAdd*() functions return
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57 // the thing they added so you can create and add in one go.
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58 cpShape *ballShape = cpSpaceAddShape(space, cpCircleShapeNew(ballBody, radius, cpvzero));
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59 ballShape.e = 0.0f; ballShape.u = 0.9f;
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60
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61 bool finished=false;
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62 while(!finished)
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63 {
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64 // Chipmunk allows you to use a different timestep each frame,
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65 // but it works much better when you use a fixed timestep.
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66 // An excellent article on why fixed timesteps for game logic can
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67 // be found here: http://gafferongames.com/game-physics/fix-your-timestep/
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68 cpSpaceStep(space, 1.0f/60.0f);
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69
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70 // print position
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71 writefln("pos %s,%s",ballBody.p.x,ballBody.p.y);
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72
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73 // stop simulation once the ball touches the ground
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74 finished = (ballBody.p.y < -225);
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75 }
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76
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77 // free our objects
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78 cpSpaceFreeChildren(space);
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79 // free the space
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80 cpSpaceFree(space);
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81 } |
