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 +1,71 @@
+import processing.opengl.*;
+
+import mathematik.*;
+
+import teilchen.Particle;
+import teilchen.Physics;
+import teilchen.constraint.Stick;
+import teilchen.force.Gravity;
+import teilchen.integration.Verlet;
+
+Physics mPhysics;
+
+Particle[] mParticles;
+
+void setup() {
+  size(640, 480, OPENGL);
+  frameRate(60);
+  smooth();
+
+  mPhysics = new Physics();
+  /* increase the number of iterations for contraints in each step. this can greatly relaxes tensions in the system. */
+  mPhysics.contraint_iterations_per_steps = 5;
+
+  /* add gravity for extra fun */
+  mPhysics.add(new Gravity());
+
+  /* we chose verlet integration as it integrates much more nicely with sticks ( and constraints in general ) */
+  Verlet myVerlet = new Verlet();
+  myVerlet.damping(0.99f);
+  mPhysics.setInegratorRef(myVerlet);
+
+  /* setup sticks to form a whip */
+  mParticles = new Particle[16];
+  float mSegmentLength = 20.0;
+  /* create root */
+  for (int x = 0; x < mParticles.length; x++) {
+    mParticles[x] = mPhysics.makeParticle(x * mSegmentLength, 0, 0, 0.1f);
+    if (x > 0) {
+      Stick myStick = new Stick(mParticles[x - 1],
+      mParticles[x],
+      mSegmentLength);
+      /* damp the stick to release tensions from the system */
+      myStick.damping(0.99f);
+      mPhysics.add(myStick);
+    }
+  }
+
+  /* fix root particle so it can stick to the mouse later */
+  mParticles[0].fixed(true);
+}
+
+void draw() {
+  /* stick root particle to mouse */
+  mParticles[0].position().set(mouseX, mouseY);
+
+  /* update */
+  mPhysics.step(1.0 / frameRate);
+
+  /* draw sticks with descending stroke weight */
+  background(255);
+  stroke(0, 192);
+  for (int x = 1; x < mParticles.length; x++) {
+    Particle p1 = mParticles[x - 1];
+    Particle p2 = mParticles[x];
+    final float mStrokeWeight = 4.0 * (1.0 - (float)x / mParticles.length);
+    strokeWeight(mStrokeWeight);
+    line(p1.position().x, p1.position().y, p1.position().z,
+    p2.position().x, p2.position().y, p2.position().z);
+  }
+}
+