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 +1,70 @@
+import processing.opengl.*;
+
+import mathematik.*;
+
+import teilchen.Particle;
+import teilchen.Physics;
+import teilchen.force.Spring;
+
+/**
+ * this sketch shows
+ * 1 how to create a viscous drag to slow motion eventually down.
+ * 2 how to create a spring that connects two particles.
+ */
+
+Physics mPhysics;
+
+Particle mRoot;
+
+void setup() {
+  size(640, 480, OPENGL);
+  smooth();
+  frameRate(30);
+
+  /* create a particle system */
+  mPhysics = new Physics();
+
+  /* create a particle to which we will connect springs */
+  mRoot = mPhysics.makeParticle(width / 2, height / 2, 0.0);
+  /* we give the root particle a higher mass so it doesn t move as easily */
+  mRoot.mass(30);
+}
+
+void draw() {
+  /* create a particle at mouse position and connect it to the root particle through a spring */
+  if (mousePressed) {
+    Particle mParticle = mPhysics.makeParticle(mouseX, mouseY, 0);
+    Spring mSpring = mPhysics.makeSpring(mRoot, mParticle);
+    /* restlength defines the desired length of the spring. in this case it is the distance between the two particles. */
+    float mRestlength = mSpring.restlength();
+    /* we modify the restlength to add a bit of energy into the system */
+    mSpring.restlength(mRestlength * 1.5f);
+  }
+
+  /* update the particle system */
+  final float mDeltaTime = 1.0 / frameRate;
+  mPhysics.step(mDeltaTime);
+
+  /* draw particles and connecting line */
+  background(255);
+
+  /* draw springs */
+  noFill();
+  stroke(255, 0, 127, 64);
+  for (int i = 0; i < mPhysics.forces().size(); i++) {
+    if (mPhysics.forces().get(i) instanceof Spring) {
+      Spring mSSpring = (Spring)mPhysics.forces().get(i);
+      line(mSSpring.a().position().x, mSSpring.a().position().y,
+      mSSpring.b().position().x, mSSpring.b().position().y);
+    }
+  }
+  /* draw particles */
+  fill(245);
+  stroke(164);
+  for (int i = 0; i < mPhysics.particles().size(); i++) {
+    ellipse(mPhysics.particles().get(i).position().x,
+    mPhysics.particles().get(i).position().y,
+    12, 12);
+  }
+}
+