84 lines
2.2 KiB
Plaintext
84 lines
2.2 KiB
Plaintext
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import processing.opengl.*;
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import mathematik.*;
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import teilchen.Physics;
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import teilchen.force.Gravity;
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import teilchen.force.ViscousDrag;
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import teilchen.util.DrawLib;
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import teilchen.Particle;
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import teilchen.constraint.Box;
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import teilchen.integration.RungeKutta;
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import teilchen.util.StableSpringQuad;
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Physics mPhysics;
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Particle mRoot;
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void setup() {
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size(640, 480, OPENGL);
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smooth();
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frameRate(60);
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mPhysics = new Physics();
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/* we use 'runge kutta' as it is more stable for this application */
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mPhysics.setInegratorRef(new RungeKutta());
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Gravity myGravity = new Gravity();
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myGravity.force().y = 98.1f;
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mPhysics.add(myGravity);
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/* add drag to smooth the spring interaction */
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mPhysics.add(new ViscousDrag(0.2f));
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/* add a container */
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Box myBox = new Box();
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myBox.min().set(0, 0, 0);
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myBox.max().set(width, height, 0);
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mPhysics.add(myBox);
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/* create root */
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Particle a = mPhysics.makeParticle(0, 0);
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Particle b = mPhysics.makeParticle(100, 0);
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Particle c = mPhysics.makeParticle(100, 100);
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Particle d = mPhysics.makeParticle(0, 100);
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new StableSpringQuad(mPhysics, d, c, mPhysics.makeParticle(100, 200), mPhysics.makeParticle(0, 200));
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/* create stable quad from springs */
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/* first the edge-springs ... */
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final float mySpringConstant = 100;
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final float mySpringDamping = 5;
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mPhysics.makeSpring(a, b, mySpringConstant, mySpringDamping);
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mPhysics.makeSpring(b, c, mySpringConstant, mySpringDamping);
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mPhysics.makeSpring(c, d, mySpringConstant, mySpringDamping);
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mPhysics.makeSpring(d, a, mySpringConstant, mySpringDamping).restlength();
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/* ... then the diagonal-springs */
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mPhysics.makeSpring(a, c, mySpringConstant, mySpringDamping);
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mPhysics.makeSpring(b, d, mySpringConstant, mySpringDamping).restlength();
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/* define 'a' as root particle for mouse interaction */
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mRoot = a;
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mRoot.fixed(true);
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}
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void draw() {
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/* handle particles */
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if (mousePressed) {
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mRoot.fixed(true);
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mRoot.position().set(mouseX, mouseY);
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}
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else {
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mRoot.fixed(false);
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}
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mPhysics.step(1f / frameRate);
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/* draw */
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background(255);
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DrawLib.drawSprings(g, mPhysics, color(255, 0, 127, 64));
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DrawLib.drawParticles(g, mPhysics, 12, color(164), color(245));
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}
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