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Temp removing nature of code examples because of underscores
This commit is contained in:
Casey Reas
-86
@@ -1,86 +0,0 @@
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// The Nature of Code
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// <http://www.shiffman.net/teaching/nature>
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// Spring 2012
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// PBox2D example
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// A rectangular box
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class Box {
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// We need to keep track of a Body and a width and height
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Body body;
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float w;
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float h;
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// Constructor
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Box(float x_, float y_) {
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float x = x_;
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float y = y_;
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w = 24;
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h = 24;
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// Add the box to the box2d world
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makeBody(new Vec2(x, y), w, h);
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body.setUserData(this);
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}
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// This function removes the particle from the box2d world
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void killBody() {
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box2d.destroyBody(body);
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}
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boolean contains(float x, float y) {
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Vec2 worldPoint = box2d.coordPixelsToWorld(x, y);
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Fixture f = body.getFixtureList();
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boolean inside = f.testPoint(worldPoint);
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return inside;
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}
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// Drawing the box
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void display() {
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// We look at each body and get its screen position
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Vec2 pos = box2d.getBodyPixelCoord(body);
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// Get its angle of rotation
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float a = body.getAngle();
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rectMode(PConstants.CENTER);
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pushMatrix();
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translate(pos.x, pos.y);
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rotate(-a);
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fill(175);
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stroke(0);
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rect(0, 0, w, h);
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popMatrix();
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}
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// This function adds the rectangle to the box2d world
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void makeBody(Vec2 center, float w_, float h_) {
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// Define and create the body
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BodyDef bd = new BodyDef();
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bd.type = BodyType.DYNAMIC;
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bd.position.set(box2d.coordPixelsToWorld(center));
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body = box2d.createBody(bd);
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// Define a polygon (this is what we use for a rectangle)
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PolygonShape sd = new PolygonShape();
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float box2dW = box2d.scalarPixelsToWorld(w_/2);
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float box2dH = box2d.scalarPixelsToWorld(h_/2);
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sd.setAsBox(box2dW, box2dH);
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// Define a fixture
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FixtureDef fd = new FixtureDef();
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fd.shape = sd;
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// Parameters that affect physics
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fd.density = 1;
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fd.friction = 0.3;
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fd.restitution = 0.5;
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body.createFixture(fd);
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//body.setMassFromShapes();
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// Give it some initial random velocity
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body.setLinearVelocity(new Vec2(random(-5, 5), random(2, 5)));
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body.setAngularVelocity(random(-5, 5));
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}
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}
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-114
@@ -1,114 +0,0 @@
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// The Nature of Code
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// <http://www.shiffman.net/teaching/nature>
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// Spring 2010
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// PBox2D example
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// Basic example of controlling an object with our own motion (by attaching a MouseJoint)
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// Also demonstrates how to know which object was hit
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import pbox2d.*;
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import org.jbox2d.common.*;
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import org.jbox2d.dynamics.joints.*;
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import org.jbox2d.collision.shapes.*;
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import org.jbox2d.collision.shapes.Shape;
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import org.jbox2d.common.*;
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import org.jbox2d.dynamics.*;
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import org.jbox2d.dynamics.contacts.*;
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// A reference to our box2d world
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PBox2D box2d;
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// Just a single box this time
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Box box;
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// An ArrayList of particles that will fall on the surface
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ArrayList<Particle> particles;
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// The Spring that will attach to the box from the mouse
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Spring spring;
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// Perlin noise values
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float xoff = 0;
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float yoff = 1000;
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void setup() {
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size(400,300);
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smooth();
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// Initialize box2d physics and create the world
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box2d = new PBox2D(this);
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box2d.createWorld();
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// Add a listener to listen for collisions!
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box2d.world.setContactListener(new CustomListener());
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// Make the box
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box = new Box(width/2,height/2);
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// Make the spring (it doesn't really get initialized until the mouse is clicked)
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spring = new Spring();
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spring.bind(width/2,height/2,box);
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// Create the empty list
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particles = new ArrayList<Particle>();
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}
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void draw() {
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background(255);
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if (random(1) < 0.2) {
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float sz = random(4,8);
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particles.add(new Particle(width/2,-20,sz));
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}
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// We must always step through time!
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box2d.step();
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// Make an x,y coordinate out of perlin noise
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float x = noise(xoff)*width;
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float y = noise(yoff)*height;
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xoff += 0.01;
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yoff += 0.01;
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// This is tempting but will not work!
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// box.body.setXForm(box2d.screenToWorld(x,y),0);
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// Instead update the spring which pulls the mouse along
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if (mousePressed) {
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spring.update(mouseX,mouseY);
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} else {
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spring.update(x,y);
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}
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//box.body.setAngularVelocity(0);
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// Look at all particles
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for (int i = particles.size()-1; i >= 0; i--) {
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Particle p = particles.get(i);
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p.display();
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// Particles that leave the screen, we delete them
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// (note they have to be deleted from both the box2d world and our list
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if (p.done()) {
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particles.remove(i);
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}
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}
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// Draw the box
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box.display();
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// Draw the spring
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// spring.display();
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}
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-57
@@ -1,57 +0,0 @@
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// The Nature of Code
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// <http://www.shiffman.net/teaching/nature>
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// Spring 2010
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// PBox2D example
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// ContactListener to listen for collisions!
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import org.jbox2d.callbacks.ContactImpulse;
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import org.jbox2d.callbacks.ContactListener;
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import org.jbox2d.collision.Manifold;
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import org.jbox2d.dynamics.contacts.Contact;
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class CustomListener implements ContactListener {
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CustomListener() {
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}
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// This function is called when a new collision occurs
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void beginContact(Contact cp) {
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// Get both fixtures
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Fixture f1 = cp.getFixtureA();
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Fixture f2 = cp.getFixtureB();
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// Get both bodies
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Body b1 = f1.getBody();
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Body b2 = f2.getBody();
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// Get our objects that reference these bodies
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Object o1 = b1.getUserData();
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Object o2 = b2.getUserData();
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// If object 1 is a Box, then object 2 must be a particle
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// Note we are ignoring particle on particle collisions
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if (o1.getClass() == Box.class) {
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Particle p = (Particle) o2;
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p.change();
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}
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// If object 2 is a Box, then object 1 must be a particle
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else if (o2.getClass() == Box.class) {
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Particle p = (Particle) o1;
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p.change();
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}
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}
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void endContact(Contact contact) {
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// TODO Auto-generated method stub
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}
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void preSolve(Contact contact, Manifold oldManifold) {
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// TODO Auto-generated method stub
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}
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void postSolve(Contact contact, ContactImpulse impulse) {
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// TODO Auto-generated method stub
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}
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}
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-92
@@ -1,92 +0,0 @@
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// The Nature of Code
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// <http://www.shiffman.net/teaching/nature>
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// Spring 2010
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// PBox2D example
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// A circular particle
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class Particle {
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// We need to keep track of a Body and a radius
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Body body;
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float r;
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color col;
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Particle(float x, float y, float r_) {
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r = r_;
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// This function puts the particle in the Box2d world
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makeBody(x, y, r);
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body.setUserData(this);
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col = color(175);
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}
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// This function removes the particle from the box2d world
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void killBody() {
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box2d.destroyBody(body);
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}
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// Change color when hit
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void change() {
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col = color(255, 0, 0);
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}
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// Is the particle ready for deletion?
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boolean done() {
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// Let's find the screen position of the particle
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Vec2 pos = box2d.getBodyPixelCoord(body);
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// Is it off the bottom of the screen?
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if (pos.y > height+r*2) {
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killBody();
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return true;
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}
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return false;
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}
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//
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void display() {
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// We look at each body and get its screen position
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Vec2 pos = box2d.getBodyPixelCoord(body);
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// Get its angle of rotation
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float a = body.getAngle();
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pushMatrix();
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translate(pos.x, pos.y);
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rotate(a);
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fill(col);
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stroke(0);
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strokeWeight(1);
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ellipse(0, 0, r*2, r*2);
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// Let's add a line so we can see the rotation
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line(0, 0, r, 0);
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popMatrix();
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}
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// Here's our function that adds the particle to the Box2D world
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void makeBody(float x, float y, float r) {
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// Define a body
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BodyDef bd = new BodyDef();
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// Set its position
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bd.position = box2d.coordPixelsToWorld(x, y);
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bd.type = BodyType.DYNAMIC;
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body = box2d.createBody(bd);
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// Make the body's shape a circle
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CircleShape cs = new CircleShape();
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cs.m_radius = box2d.scalarPixelsToWorld(r);
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FixtureDef fd = new FixtureDef();
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fd.shape = cs;
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// Parameters that affect physics
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fd.density = 1;
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fd.friction = 0.01;
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fd.restitution = 0.3;
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// Attach fixture to body
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body.createFixture(fd);
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body.setAngularVelocity(random(-10, 10));
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}
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}
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-82
@@ -1,82 +0,0 @@
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// The Nature of Code
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// <http://www.shiffman.net/teaching/nature>
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// Spring 2010
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// PBox2D example
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// Class to describe the spring joint (displayed as a line)
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class Spring {
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// This is the box2d object we need to create
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MouseJoint mouseJoint;
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Spring() {
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// At first it doesn't exist
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mouseJoint = null;
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}
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// If it exists we set its target to the mouse location
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void update(float x, float y) {
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if (mouseJoint != null) {
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// Always convert to world coordinates!
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Vec2 mouseWorld = box2d.coordPixelsToWorld(x,y);
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mouseJoint.setTarget(mouseWorld);
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}
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}
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void display() {
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if (mouseJoint != null) {
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// We can get the two anchor points
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Vec2 v1 = null;
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mouseJoint.getAnchorA(v1);
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Vec2 v2 = null;
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mouseJoint.getAnchorB(v2);
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// Convert them to screen coordinates
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v1 = box2d.coordWorldToPixels(v1);
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v2 = box2d.coordWorldToPixels(v2);
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// And just draw a line
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stroke(0);
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strokeWeight(1);
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line(v1.x,v1.y,v2.x,v2.y);
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}
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}
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// This is the key function where
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// we attach the spring to an x,y location
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// and the Box object's location
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void bind(float x, float y, Box box) {
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// Define the joint
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MouseJointDef md = new MouseJointDef();
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// Body A is just a fake ground body for simplicity (there isn't anything at the mouse)
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md.bodyA = box2d.getGroundBody();
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// Body 2 is the box's boxy
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md.bodyB = box.body;
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// Get the mouse location in world coordinates
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Vec2 mp = box2d.coordPixelsToWorld(x,y);
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// And that's the target
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md.target.set(mp);
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// Some stuff about how strong and bouncy the spring should be
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md.maxForce = 1000.0f * box.body.m_mass;
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md.frequencyHz = 5.0f;
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md.dampingRatio = 0.9f;
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// Wake up body!
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//box.body.wakeUp();
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// Make the joint!
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mouseJoint = (MouseJoint) box2d.world.createJoint(md);
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}
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void destroy() {
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// We can get rid of the joint when the mouse is released
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if (mouseJoint != null) {
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box2d.world.destroyJoint(mouseJoint);
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mouseJoint = null;
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}
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}
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}
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Reference in New Issue
Block a user