day3 (german!) libs

2015-03-04 09:41:41 +01:00
parent 6b37eb529e
commit e772172cbc
133 changed files with 18241 additions and 0 deletions
@@ -0,0 +1,88 @@
+import processing.opengl.*;
+
+import mathematik.*;
+
+import teilchen.Particle;
+import teilchen.Physics;
+import teilchen.constraint.Teleporter;
+import teilchen.force.Attractor;
+import teilchen.force.ViscousDrag;
+
+/**
+ * this sketch shows how to create and use attractors.
+ */
+
+Physics mPhysics;
+
+Attractor mAttractor;
+
+void setup() {
+  size(640, 480, OPENGL);
+  smooth();
+  frameRate(30);
+
+  /* create a particle system */
+  mPhysics = new Physics();
+
+  /* create a viscous force that slows down all motion */
+  ViscousDrag myDrag = new ViscousDrag();
+  myDrag.coefficient = 0.75f;
+  mPhysics.add(myDrag);
+
+  /* teleport particles from one edge of the screen to the other */
+  Teleporter mTeleporter = new Teleporter();
+  mTeleporter.min().set(0, 0);
+  mTeleporter.max().set(width, height);
+  mPhysics.add(mTeleporter);
+
+  /* create some particles */
+  for (int i = 0; i < 100; i++) {
+    Particle myParticle = mPhysics.makeParticle();
+    myParticle.position().set(random(width), random(height));
+  }
+
+  /* create an attractor */
+  mAttractor = new Attractor();
+  mAttractor.radius(100);
+  mAttractor.strength(150);
+  mPhysics.add(mAttractor);
+}
+
+void mousePressed() {
+  /* flip the direction of the attractors strength. */
+  float myInvertedStrength = -1 * mAttractor.strength();
+  /* a negative strength turns the attractor into a repulsor */
+  mAttractor.strength(myInvertedStrength);
+}
+
+void draw() {
+  /* set attractor to mouse position */
+  mAttractor.position().set(mouseX, mouseY);
+
+  /* update the particle system */
+  final float mDeltaTime = 1.0 / frameRate;
+  mPhysics.step(mDeltaTime);
+
+  /* draw */
+  background(255);
+
+  /* draw all the particles in particle system */
+  fill(245);
+  stroke(164);
+  for (int i = 0; i < mPhysics.particles().size(); i++) {
+    Particle myParticle = mPhysics.particles(i);
+    ellipse(myParticle.position().x, myParticle.position().y, 12, 12);
+  }
+
+  /* draw attractor. green if it is attracting and red if it is repelling */
+  noStroke();
+  if (mAttractor.strength() < 0) {
+    fill(255, 0, 0, 50);
+  } 
+  else {
+    fill(0, 255, 0, 50);
+  }
+  ellipse(mAttractor.position().x, mAttractor.position().y,
+  mAttractor.radius(), mAttractor.radius());
+}
+