Idiomatic and fast C# bindings for the Chipmunk physics engine
Usable as a decent foundation to expand upon.
These tests are based on the official "Hello World"
C# Code:
static void Main(string[] args)
{
cpSpace space = new cpSpace();
space.SetGravity(new cpVect(0,-100));
cpShape shape = cpShape.NewSegment(space.StaticBody, new cpVect(-20, 5), new cpVect(20, -5), 0);
shape.SetFriction(1);
space.AddShape(shape);
double radius = 5;
double mass = 1;
double moment = cpUtil.MomentForCircle(mass, 0, radius, cpVect.Zero);
cpBody ballBody = new cpBody(mass, moment);
space.AddBody(ballBody);
ballBody.Position = new cpVect(0, 15);
cpShape ballShape = cpShape.NewCircle(ballBody, radius, cpVect.Zero);
space.AddShape(ballShape);
ballShape.SetFriction(0.7);
double timeStep = 1 / 60d;
for (double time = 0; time < 2; time+=timeStep)
{
cpVect pos = ballBody.Position;
cpVect vel = ballBody.Velocity;
Console.WriteLine("Time is {0:F2}. ballBody is at ({1:F2}, {2:F2}). It's velocity is ({3:F2}, {4:F2})",
time, pos.X, pos.Y, vel.X, vel.Y
);
space.Step(timeStep);
}
}C# Output:
Time is 0.00. ballBody is at (0.00, 15.00). It's velocity is (0.00, 0.00)
Time is 0.02. ballBody is at (0.00, 15.00). It's velocity is (0.00, -1.67)
[...]
Time is 2.00. ballBody is at (28.93, -6.27). It's velocity is (26.68, -36.10)
C99 Code:
int main(void) {
cpVect gravity = cpv(0, -100);
cpSpace *space = cpHastySpaceNew();
cpSpaceSetGravity(space, gravity);
cpHastySpaceSetThreads(space, 2);
cpShape *ground = cpSegmentShapeNew(space->staticBody, cpv(-20, 5), cpv(20, -5), 0);
cpShapeSetFriction(ground, 1);
cpSpaceAddShape(space, ground);
cpFloat radius = 5;
cpFloat mass = 1;
cpFloat moment = cpMomentForCircle(mass, 0, radius, cpvzero);
cpBody *ballBody = cpSpaceAddBody(space, cpBodyNew(mass, moment));
cpBodySetPosition(ballBody, cpv(0, 15));
cpShape *ballShape = cpSpaceAddShape(space, cpCircleShapeNew(ballBody, radius, cpvzero));
cpShapeSetFriction(ballShape, 0.7);
cpFloat timeStep = 1.0 / 60.0;
for (cpFloat time = 0; time < 2; time += timeStep) {
cpVect pos = cpBodyGetPosition(ballBody);
cpVect vel = cpBodyGetVelocity(ballBody);
printf(
"Time is %5.2f. ballBody is at (%5.2f, %5.2f). It's velocity is (%5.2f, %5.2f)\n",
time, pos.x, pos.y, vel.x, vel.y
);
cpHastySpaceStep(space, timeStep);
}
cpShapeFree(ballShape);
cpShapeFree(ground);
cpSpaceFree(space);
return 0;
}C99 Output:
Time is 0.00. ballBody is at ( 0.00, 15.00). It's velocity is ( 0.00, 0.00)
Time is 0.02. ballBody is at ( 0.00, 15.00). It's velocity is ( 0.00, -1.67)
[...]
Time is 2.00. ballBody is at (28.93, -6.27). It's velocity is (26.68, -36.10)