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 +1,83 @@
+import processing.opengl.*;
+
+import mathematik.*;
+
+import teilchen.Physics;
+import teilchen.force.Gravity;
+import teilchen.force.ViscousDrag;
+import teilchen.util.DrawLib;
+import teilchen.Particle;
+import teilchen.constraint.Box;
+import teilchen.integration.RungeKutta;
+import teilchen.util.StableSpringQuad;
+
+Physics mPhysics;
+
+Particle mRoot;
+
+void setup() {
+  size(640, 480, OPENGL);
+  smooth();
+  frameRate(60);
+
+  mPhysics = new Physics();
+  /* we use 'runge kutta' as it is more stable for this application */
+  mPhysics.setInegratorRef(new RungeKutta());
+
+  Gravity myGravity = new Gravity();
+  myGravity.force().y = 98.1f;
+  mPhysics.add(myGravity);
+
+  /* add drag to smooth the spring interaction */
+  mPhysics.add(new ViscousDrag(0.2f));
+
+  /* add a container */
+  Box myBox = new Box();
+  myBox.min().set(0, 0, 0);
+  myBox.max().set(width, height, 0);
+  mPhysics.add(myBox);
+
+  /* create root */
+  Particle a = mPhysics.makeParticle(0, 0);
+  Particle b = mPhysics.makeParticle(100, 0);
+  Particle c = mPhysics.makeParticle(100, 100);
+  Particle d = mPhysics.makeParticle(0, 100);
+
+  new StableSpringQuad(mPhysics, d, c, mPhysics.makeParticle(100, 200), mPhysics.makeParticle(0, 200));
+
+  /* create stable quad from springs */
+  /* first the edge-springs ... */
+  final float mySpringConstant = 100;
+  final float mySpringDamping = 5;
+  mPhysics.makeSpring(a, b, mySpringConstant, mySpringDamping);
+  mPhysics.makeSpring(b, c, mySpringConstant, mySpringDamping);
+  mPhysics.makeSpring(c, d, mySpringConstant, mySpringDamping);
+  mPhysics.makeSpring(d, a, mySpringConstant, mySpringDamping).restlength();
+  /* ... then the diagonal-springs */
+  mPhysics.makeSpring(a, c, mySpringConstant, mySpringDamping);
+  mPhysics.makeSpring(b, d, mySpringConstant, mySpringDamping).restlength();
+
+  /* define 'a' as root particle for mouse interaction */
+  mRoot = a;
+  mRoot.fixed(true);
+}
+
+void draw() {
+
+  /* handle particles */
+  if (mousePressed) {
+    mRoot.fixed(true);
+    mRoot.position().set(mouseX, mouseY);
+  } 
+  else {
+    mRoot.fixed(false);
+  }
+
+  mPhysics.step(1f / frameRate);
+
+  /* draw */
+  background(255);
+  DrawLib.drawSprings(g, mPhysics, color(255, 0, 127, 64));
+  DrawLib.drawParticles(g, mPhysics, 12, color(164), color(245));
+}
+