NATURE OF CODE-5 : Boxes 예제(Box2D 라이브러리 사용)

// Box.pde class Box{ Body body; // Box2D Object(World, Body, Fixture, Shape float w, h; //weight, height Box(){ w = 16; h = 16; // 1. create bodyDef BodyDef bd = new BodyDef(); bd.type = BodyType.DYNAMIC; bd.position.set(box2d.coordPixelsToWorld(mouseX, mouseY)); // 2. define body body = box2d.createBody(bd); // 3. create Shape PolygonShape ps = new PolygonShape(); float box2DW = box2d.scalarPixelsToWorld(w/2); float box2DH = box2d.scalarPixelsToWorld(h/2); ps.setAsBox(box2DW, box2DH); //4. create FixtureDef FixtureDef fd = new FixtureDef(); fd.shape = ps; fd.friction=0.3; // 물리 속성(마찰) fd.restitution=0.5; // 물리속성(탄성) fd.density=1.0; // same as water(1kg/m3) // 5. combinate body, fixture, shape body.createFixture(fd); } void display(){ Vec2 pos = box2d.getBodyPixelCoord(body); // 위치를 가져온다. float a = body.getAngle(); //각도를 가져온다. pushMatrix(); translate(pos.x, pos.y); // body가 있는 위치로 좌표를 변환함 rotate(-a); fill(175); stroke(0); rectMode(CENTER); rect(0, 0, w, h); popMatrix(); } void killBody(){ box2d.destroyBody(body); } } //--------------------------------------- // Boxes.pde import shiffman.box2d.*; import org.jbox2d.collision.shapes.*; import org.jbox2d.common.*; import org.jbox2d.dynamics.*; import java.util.ArrayList; Box2DProcessing box2d; ArrayList<Box> boxes; void setup(){ size(640, 480); box2d = new Box2DProcessing(this); box2d.createWorld(); boxes = new ArrayList<Box>(); } void draw(){ background(255); box2d.step(); //when pressed mouse, box is created if(mousePressed){ Box p = new Box(); boxes.add(p); } // Display ArrayList for(Box b:boxes){ b.display(); } }