代码5-10 用toxiclibs实现简朴的弹簧模仿
import toxi.physics2d.*;import toxi.physics2d.behaviors.*;import toxi.geom.*;// Reference to physics worldVerletPhysics2D physicsarticle p1article p2;void setup() { size(640,360); // Initialize the physics physics=new VerletPhysics2D(); physics.addBehavior(new GravityBehavior(new Vec2D(0,0.5))); // Set the world's bounding box physics.setWorldBounds(new Rect(0,0,width,height)); // Make two particles p1 = new Particle(new Vec2D(width/2,20)); p2 = new Particle(new Vec2D(width/2+160,20)); // Lock one in place p1.lock(); // Make a spring connecting both Particles VerletSpring2D spring=new VerletSpring2D(p1,p2,160,0.01); // Anything we make, we have to add into the physics world physics.addParticle(p1); physics.addParticle(p2); physics.addSpring(spring);}void draw() { // Update the physics world physics.update(); background(255); // Draw a line between the particles stroke(0); strokeWeight(2); line(p1.x,p1.y,p2.x,p2.y); // Display the particles p1.display(); p2.display(); // Move the second one according to the mouse if (mousePressed) { p2.lock(); p2.x = mouseX; p2.y = mouseY; p2.unlock(); } }Particle.pde
class Particle extends VerletParticle2D { Particle(Vec2D loc) { super(loc); } // All we're doing really is adding a display() function to a VerletParticle void display() { fill(127); stroke(0); strokeWeight(2); ellipse(x,y,32,32); }}3、运行结果
article p1
