132 lines
3.4 KiB
Plaintext
Executable File
132 lines
3.4 KiB
Plaintext
Executable File
import mathematik.Vector3f;
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import teilchen.Particle;
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import teilchen.Physics;
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import teilchen.ShortLivedParticle;
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import teilchen.constraint.Box;
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import teilchen.force.Attractor;
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import teilchen.force.Gravity;
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import teilchen.force.ViscousDrag;
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import teilchen.util.ParticleTrail;
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import java.util.Vector;
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Physics mPhysics;
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Vector<ParticleTrail> mTrails;
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Attractor mAttractor;
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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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/* create a particle system */
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mPhysics = new Physics();
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/* create a gravitational force */
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Gravity myGravity = new Gravity();
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mPhysics.add(myGravity);
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myGravity.force().y = 20;
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/* create drag */
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ViscousDrag myViscousDrag = new ViscousDrag();
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myViscousDrag.coefficient = 0.1f;
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mPhysics.add(myViscousDrag);
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final float mBorder = 40;
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Box mBox = new Box(new Vector3f(mBorder, mBorder, mBorder), new Vector3f(width - mBorder, height - mBorder, 100 - mBorder));
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mBox.reflect(true);
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mPhysics.add(mBox);
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/* create an attractor */
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mAttractor = new Attractor();
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mAttractor.radius(200);
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mAttractor.strength(-300);
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mPhysics.add(mAttractor);
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/* create trails and particles */
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mTrails = new Vector<ParticleTrail>();
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for (int i = 0; i < 500; i++) {
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Particle mParticle = mPhysics.makeParticle();
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mParticle.mass(2.0f);
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ParticleTrail myParticleTrail = new ParticleTrail(mPhysics, mParticle, 0.2f, random(0.5f, 1));
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myParticleTrail.mass(0.5f);
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mTrails.add(myParticleTrail);
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}
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resetParticles(width / 2, height / 2);
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}
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void resetParticles(float x, float y) {
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for (ParticleTrail myTrails : mTrails) {
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myTrails.particle().position().set(x + random(-10, 10), y + random(-10, 10), 0);
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myTrails.particle().velocity().set(random(-10, 10), random(-10, 10), random(-10, 10));
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myTrails.fragments().clear();
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}
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}
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void draw() {
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/* set attractor to mouse position */
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mAttractor.position().set(mouseX, mouseY);
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for (ParticleTrail myTrails : mTrails) {
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myTrails.loop(1f / frameRate);
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}
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mPhysics.step(1f / frameRate);
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background(255);
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for (ParticleTrail myTrail : mTrails) {
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drawTrail(myTrail);
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}
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}
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void drawTrail(ParticleTrail theTrail) {
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final Vector<Particle> mFragments = theTrail.fragments();
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final Particle mParticle = theTrail.particle();
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/* draw head */
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if (mFragments.size() > 1) {
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fill(255, 0, 127);
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noStroke();
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pushMatrix();
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translate(mParticle.position().x,
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mParticle.position().y,
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mParticle.position().z);
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sphereDetail(4);
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sphere(3);
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popMatrix();
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}
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/* draw trail */
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for (int i = 0; i < mFragments.size() - 1; i++) {
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if (mFragments.get(i) instanceof ShortLivedParticle) {
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final float mRatio = 1.0f - ((ShortLivedParticle)mFragments.get(i)).ageRatio();
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stroke(127, mRatio * 255);
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strokeWeight(mRatio * 3);
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}
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int j = (i + 1) % mFragments.size();
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line(mFragments.get(i).position().x,
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mFragments.get(i).position().y,
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mFragments.get(i).position().z,
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mFragments.get(j).position().x,
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mFragments.get(j).position().y,
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mFragments.get(j).position().z);
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}
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if (!mFragments.isEmpty()) {
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line(mFragments.lastElement().position().x,
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mFragments.lastElement().position().y,
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mFragments.lastElement().position().z,
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mParticle.position().x,
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mParticle.position().y,
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mParticle.position().z);
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}
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}
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void mousePressed() {
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resetParticles(mouseX, mouseY);
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}
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