72 lines
2.0 KiB
Plaintext
72 lines
2.0 KiB
Plaintext
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import mathematik.*;
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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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/**
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* this sketch show how to create a particle system with a single particle in it.
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*/
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Physics mPhysics;
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Particle mParticle;
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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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/*
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* a physic-based particle system consists of a few components.
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*
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* 1 particles.
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* there are different kinds of particles. for now we use a simple particle.
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*
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* 2 forces.
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* there are all kinds of forces. one of the most obvious force is the gravitational force,
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* but there all kinds of different forces like attractors and springs. forces usually
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* affect all particles in the system.
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*
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* 3 behaviors
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* a behavior is special kind of force. it is something like an internal force or a motor
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* that only affects a single particle. a typical force is for example the 'seek force'
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* which constantly pulls a particle into a certain direction.
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*
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* 4 integrators.
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* integrators are used to integrate acceleration and velocity to calculate the new position.
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* the most well-known is the 'euler' integrator, but there are also optimized versions like 'runge-kutta'
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* or 'Midpoint' or even slightly different concepts like 'verlet'.
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*
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*/
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/* create a particle. note that the particle is automatically added to particle system */
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mParticle = mPhysics.makeParticle();
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}
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void draw() {
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/* update the particle system to the next step. usually the time step is the duration of the las frame */
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final float mDeltaTime = 1.0 / frameRate;
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mPhysics.step(mDeltaTime);
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/* draw particle */
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background(255);
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stroke(0, 127);
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fill(0, 32);
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ellipse(mParticle.position().x, mParticle.position().y, 12, 12);
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/* reset particle s position and velocity */
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if (mousePressed) {
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mParticle.position().set(mouseX, mouseY);
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mParticle.velocity().set(mouseX - pmouseX, mouseY - pmouseY);
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mParticle.velocity().scale(10);
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}
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}
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