4-2 Fisicaの図形の描き方†

import fisica.*;

FWorld world;
MyBall ball1, ball2;

class MyBall extends FCircle{
  MyBall( float r ){
    super( r );
  }
  public void draw(PGraphics applet) {
    preDraw(applet);

    if (m_image != null ) {
      drawImage(applet);
    } else {
      applet.ellipse(0, 0, getSize(), getSize());
      applet.fill( 0 );
      applet.ellipse( getSize()/3, 0, 3, 3 );
    }

    postDraw(applet);
  }
}


void setup(){
  size(600,300);
  Fisica.init(this);
  world = new FWorld();
  world.setEdges();
  world.setEdgesFriction( 0 );
  ball1=new MyBall(40);
  ball1.setDamping( 0 );
  ball1.setDensity( 2 );
  ball1.setFriction( 0.1 );
  ball1.setRestitution( 1 );
  ball1.setPosition( 50, 274.5 );
  ball1.setGrabbable( false );
  ball1.setFill( 128, 255, 128 );
  world.add( ball1 );

  ball2=new MyBall(40);
  ball2.setDamping( 0 );
  ball2.setDensity( 4 );
  ball2.setFriction( 0.1 );
  ball2.setRestitution( 1 );
  ball2.setPosition( 200, 274.5 );
  ball2.setGrabbable( false );
  ball2.setFill( 255, 128, 128 );
  world.bottom.setFill(128);
  world.top.setFill(128);
  world.left.setFill(192);
  world.right.setFill(192);
  world.bottom.setStroke(128);
  world.top.setStroke(128);
  world.left.setStroke(192);
  world.right.setStroke(192);
  world.add( ball2 );
}

void mouseClicked(){
  if( dist( mouseX, mouseY, ball1.getX(), ball1.getY()) < ball1.getSize() ){
    ball1.addImpulse( ball1.getMass()*200, 0, mouseX-ball1.getX(), mouseY-ball1.getY() );
  }
}


void draw(){
  background(0);
  world.step();
  world.draw();
}
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