71 lines
1.9 KiB
Plaintext
71 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.force.Spring;
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/**
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* this sketch shows
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* 1 how to create a viscous drag to slow motion eventually down.
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* 2 how to create a spring that connects two particles.
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*/
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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(30);
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/* create a particle system */
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mPhysics = new Physics();
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/* create a particle to which we will connect springs */
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mRoot = mPhysics.makeParticle(width / 2, height / 2, 0.0);
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/* we give the root particle a higher mass so it doesn t move as easily */
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mRoot.mass(30);
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}
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void draw() {
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/* create a particle at mouse position and connect it to the root particle through a spring */
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if (mousePressed) {
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Particle mParticle = mPhysics.makeParticle(mouseX, mouseY, 0);
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Spring mSpring = mPhysics.makeSpring(mRoot, mParticle);
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/* restlength defines the desired length of the spring. in this case it is the distance between the two particles. */
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float mRestlength = mSpring.restlength();
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/* we modify the restlength to add a bit of energy into the system */
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mSpring.restlength(mRestlength * 1.5f);
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}
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/* update the particle system */
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final float mDeltaTime = 1.0 / frameRate;
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mPhysics.step(mDeltaTime);
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/* draw particles and connecting line */
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background(255);
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/* draw springs */
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noFill();
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stroke(255, 0, 127, 64);
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for (int i = 0; i < mPhysics.forces().size(); i++) {
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if (mPhysics.forces().get(i) instanceof Spring) {
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Spring mSSpring = (Spring)mPhysics.forces().get(i);
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line(mSSpring.a().position().x, mSSpring.a().position().y,
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mSSpring.b().position().x, mSSpring.b().position().y);
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}
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}
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/* draw particles */
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fill(245);
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stroke(164);
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for (int i = 0; i < mPhysics.particles().size(); i++) {
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ellipse(mPhysics.particles().get(i).position().x,
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mPhysics.particles().get(i).position().y,
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12, 12);
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}
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}
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