Physics::Physics(uint32 timeStep) {
// Create an empty space.
mSpace = cpSpaceNew();
cpSpaceSetGravity(mSpace, cpv(0, 0));
cpSpaceSetDamping(mSpace, 0.5);
mTimeStep = timeStep;
mAccumulator = 0;
}
static int l_physics_setSpaceDamping(lua_State* state)
{
l_tools_checkUserDataPlusErrMsg(state, 1, "You must provide a space");
l_physics_PhysicsData* physics = (l_physics_PhysicsData*)lua_touserdata(state, 1);
float damping = l_tools_toNumberOrError(state, 2);
cpSpaceSetDamping(physics->physics->space, damping);
return 0;
}
void Phys::init()
{
// Create physics space;
space = cpSpaceNew();
cpSpaceSetDamping( space, 0.0 );
cpSpaceAddCollisionHandler( space, utAll, utPlant,
DynamiUint_begin, NULL, NULL, DynamiUint_separate, NULL );
cpSpaceAddCollisionHandler( space, utAll, utEntity,
DynamiUint_begin, NULL, NULL, DynamiUint_separate, NULL );
cpSpaceAddCollisionHandler( space, utAll, utPlayer,
DynamiUint_begin, NULL, NULL, DynamiUint_separate, NULL );
cpSpaceAddCollisionHandler( space, utAll, utCorpse,
DynamiUint_begin, NULL, NULL, DynamiUint_separate, NULL );
}
static cpSpace *
init(void)
{
ChipmunkDemoMessageString = "Control the crane by moving the mouse. Press the down arrow to release.";
space = cpSpaceNew();
cpSpaceSetIterations(space, 30);
cpSpaceSetGravity(space, cpv(0, -100));
cpSpaceSetDamping(space, 0.8);
cpBody *staticBody = cpSpaceGetStaticBody(space);
cpShape *shape;
shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-320,-240), cpv(320,-240), 0.0f));
cpShapeSetElasticity(shape, 1.0f);
cpShapeSetFriction(shape, 1.0f);
cpShapeSetLayers(shape, NOT_GRABABLE_MASK);
// Add a body for the dolly.
dollyBody = cpSpaceAddBody(space, cpBodyNew(10, INFINITY));
cpBodySetPos(dollyBody, cpv(0, 100));
// Add a block so you can see it.
cpSpaceAddShape(space, cpBoxShapeNew(dollyBody, 30, 30));
// Add a groove joint for it to move back and forth on.
cpSpaceAddConstraint(space, cpGrooveJointNew(staticBody, dollyBody, cpv(-250, 100), cpv(250, 100), cpvzero));
// Add a pivot joint to act as a servo motor controlling it's position
// By updating the anchor points of the pivot joint, you can move the dolly.
dollyServo = cpSpaceAddConstraint(space, cpPivotJointNew(staticBody, dollyBody, cpBodyGetPos(dollyBody)));
// Max force the dolly servo can generate.
cpConstraintSetMaxForce(dollyServo, 10000);
// Max speed of the dolly servo
cpConstraintSetMaxBias(dollyServo, 100);
// You can also change the error bias to control how it slows down.
//cpConstraintSetErrorBias(dollyServo, 0.2);
// Add the crane hook.
cpBody *hookBody = cpSpaceAddBody(space, cpBodyNew(1, INFINITY));
cpBodySetPos(hookBody, cpv(0, 50));
// Add a sensor shape for it. This will be used to figure out when the hook touches a box.
shape = cpSpaceAddShape(space, cpCircleShapeNew(hookBody, 10, cpvzero));
cpShapeSetSensor(shape, cpTrue);
cpShapeSetCollisionType(shape, HOOK_SENSOR);
// Add a slide joint to act as a winch motor
// By updating the max length of the joint you can make it pull up the load.
winchServo = cpSpaceAddConstraint(space, cpSlideJointNew(dollyBody, hookBody, cpvzero, cpvzero, 0, INFINITY));
// Max force the dolly servo can generate.
cpConstraintSetMaxForce(winchServo, 30000);
// Max speed of the dolly servo
cpConstraintSetMaxBias(winchServo, 60);
// TODO cleanup
// Finally a box to play with
cpBody *boxBody = cpSpaceAddBody(space, cpBodyNew(30, cpMomentForBox(30, 50, 50)));
cpBodySetPos(boxBody, cpv(200, -200));
// Add a block so you can see it.
shape = cpSpaceAddShape(space, cpBoxShapeNew(boxBody, 50, 50));
cpShapeSetFriction(shape, 0.7);
cpShapeSetCollisionType(shape, CRATE);
cpSpaceAddCollisionHandler(space, HOOK_SENSOR, CRATE, (cpCollisionBeginFunc)HookCrate, NULL, NULL, NULL, NULL);
return space;
}
__declspec( dllexport ) void setdamping( const void * _in, int in_size, void * _out, int out_sz )
{
cpSpaceSetDamping(&mSpace,PEEKFLOAT(INPUT_MEMBLOCK,0));
}
void Space::setDamping(cpFloat value)
{
cpSpaceSetDamping(space,value);
}