72 lines
1.9 KiB
Plaintext
72 lines
1.9 KiB
Plaintext
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import processing.opengl.*;
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import mathematik.*;
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import teilchen.Particle;
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import teilchen.Physics;
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import teilchen.constraint.Stick;
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import teilchen.force.Gravity;
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import teilchen.integration.Verlet;
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Physics mPhysics;
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Particle[] mParticles;
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void setup() {
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size(640, 480, OPENGL);
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frameRate(60);
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smooth();
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mPhysics = new Physics();
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/* increase the number of iterations for contraints in each step. this can greatly relaxes tensions in the system. */
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mPhysics.contraint_iterations_per_steps = 5;
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/* add gravity for extra fun */
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mPhysics.add(new Gravity());
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/* we chose verlet integration as it integrates much more nicely with sticks ( and constraints in general ) */
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Verlet myVerlet = new Verlet();
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myVerlet.damping(0.99f);
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mPhysics.setInegratorRef(myVerlet);
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/* setup sticks to form a whip */
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mParticles = new Particle[16];
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float mSegmentLength = 20.0;
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/* create root */
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for (int x = 0; x < mParticles.length; x++) {
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mParticles[x] = mPhysics.makeParticle(x * mSegmentLength, 0, 0, 0.1f);
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if (x > 0) {
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Stick myStick = new Stick(mParticles[x - 1],
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mParticles[x],
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mSegmentLength);
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/* damp the stick to release tensions from the system */
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myStick.damping(0.99f);
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mPhysics.add(myStick);
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}
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}
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/* fix root particle so it can stick to the mouse later */
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mParticles[0].fixed(true);
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}
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void draw() {
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/* stick root particle to mouse */
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mParticles[0].position().set(mouseX, mouseY);
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/* update */
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mPhysics.step(1.0 / frameRate);
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/* draw sticks with descending stroke weight */
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background(255);
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stroke(0, 192);
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for (int x = 1; x < mParticles.length; x++) {
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Particle p1 = mParticles[x - 1];
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Particle p2 = mParticles[x];
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final float mStrokeWeight = 4.0 * (1.0 - (float)x / mParticles.length);
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strokeWeight(mStrokeWeight);
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line(p1.position().x, p1.position().y, p1.position().z,
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p2.position().x, p2.position().y, p2.position().z);
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}
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}
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