day3 (german!) libs

2015-03-04 09:41:41 +01:00
parent 6b37eb529e
commit e772172cbc
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+import mathematik.*;
+
+import processing.opengl.*;
+
+import mathematik.*;
+
+import teilchen.Particle;
+import teilchen.Physics;
+
+/**
+ * this sketch show how to create a particle system with a single particle in it.
+ */
+
+Physics mPhysics;
+
+Particle mParticle;
+
+void setup() {
+  size(640, 480, OPENGL);
+  smooth();
+  frameRate(30);
+
+  /* create a particle system. */
+  mPhysics = new Physics();
+
+  /*
+   * a physic-based particle system consists of a few components.
+   *
+   * 1 particles.
+   * there are different kinds of particles. for now we use a simple particle.
+   *
+   * 2 forces.
+   * there are all kinds of forces. one of the most obvious force is the gravitational force,
+   * but there all kinds of different forces like attractors and springs. forces usually
+   * affect all particles in the system.
+   *
+   * 3 behaviors
+   * a behavior is special kind of force. it is something like an internal force or a motor
+   * that only affects a single particle. a typical force is for example the 'seek force'
+   * which constantly pulls a particle into a certain direction.
+   *
+   * 4 integrators.
+   * integrators are used to integrate acceleration and velocity to calculate the new position.
+   * the most well-known is the 'euler' integrator, but there are also optimized versions like 'runge-kutta'
+   * or 'Midpoint' or even slightly different concepts like 'verlet'.
+   *
+   */
+
+  /* create a particle. note that the particle is automatically added to particle system */
+  mParticle = mPhysics.makeParticle();
+}
+
+void draw() {
+  /* update the particle system to the next step. usually the time step is the duration of the las frame */
+  final float mDeltaTime = 1.0 / frameRate;
+  mPhysics.step(mDeltaTime);
+
+  /* draw particle */
+  background(255);
+  stroke(0, 127);
+  fill(0, 32);
+  ellipse(mParticle.position().x, mParticle.position().y, 12, 12);
+
+  /* reset particle s position and velocity */
+  if (mousePressed) {
+    mParticle.position().set(mouseX, mouseY);
+    mParticle.velocity().set(mouseX - pmouseX, mouseY - pmouseY);
+    mParticle.velocity().scale(10);
+  }
+}
+