Chipmunk++

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Welcome

Chipmunk++ is a C++ wrapper for the Chipmunk Physics library. Learn more »

  • Documentation

Example

Chipmunk's Hello World example with Chipmunk++:

#include <iostream> #include <iomanip> #include <chipmunk.hpp> using namespace cp; using namespace std; int main() { // cp::Vect is a 2D vector. Vect gravity(0, -100); // Create an empty space. Space space; space.setGravity(gravity); // Add a static line segment shape for ground. // We'll make it slightly tilted so the ball will roll off. // We attach it to space.staticBody to tell Chipmunk it shouldn't be movable. auto ground = make_shared<SegmentShape>(space.staticBody, Vect(-20, 5), Vect(20, -5), 0); ground->setFriction(1); space.add(ground); // Now let's make a ball that falls onto the line and rolls off. // First we need to make a Body to hold the physical properties of the object. // These include the mass, position, velocity, angle, etc. of the object. // Then we attach collision shapes to the cp::Body to give it a size and shape. const Float radius = 5; const Float mass = 1; // The moment of inertia is like mass for rotation // Use the cp::momentFor*() functions to help you approximate it. const Float moment = momentForCircle(mass, 0, radius); auto ballBody = make_shared<Body>(mass, moment); space.add(ballBody); ballBody->setPos(Vect(0, 15)); // Now we create the collision shape for the ball. // You can create multiple collision shapes that point to the same body. // They will all be attached to the body and move arount to follow it. auto ballShape = make_shared<CircleShape>(ballBody, radius); space.add(ballShape); ballShape->setFriction(0.7); // Now that it's all set up, we simulate all the objects in the space by // stepping forward through time in small increments called steps. // It is *highly* recommended to use a fixed size time step. Float timeStep = 1.0/60.0; for (Float time = 0; time < 2; time += timeStep) { Vect pos = ballBody->getPos(); Vect vel = ballBody->getVel(); cout << setprecision(2) << fixed << "Time is " << setw(5) << time << ". " << "ballBody is at " << setw(5) << pos << ". " << "It's velocity is " << setw(5) << vel << endl; space.step(timeStep); } }

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