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 +1,68 @@
+import processing.opengl.*;
+
+import mathematik.*;
+
+import teilchen.Particle;
+import teilchen.Physics;
+import teilchen.force.Spring;
+import teilchen.force.ViscousDrag;
+
+/**
+ * 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;
+
+Spring mSpring;
+
+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; 0 means no slowing down. */
+  ViscousDrag myDrag = new ViscousDrag(0.25f);
+  mPhysics.add(myDrag);
+
+  /* create two particles that we can connect with a spring */
+  Particle myA = mPhysics.makeParticle();
+  myA.position().set(width / 2 - 50, height / 2);
+
+  Particle myB = mPhysics.makeParticle();
+  myB.position().set(width / 2 + 50, height / 2);
+
+  /* create a spring force that connects two particles.
+   * note that there is more than one way to create a spring.
+   * in our case the restlength of the spring is defined by the
+   * particles current position.
+   */
+  mSpring = mPhysics.makeSpring(myA, myB);
+}
+
+void draw() {
+  /* set first particle to mouse position */
+  if (mousePressed) {
+    mSpring.a().position().set(mouseX, mouseY);
+  }
+
+  /* update the particle system */
+  final float mDeltaTime = 1.0 / frameRate;
+  mPhysics.step(mDeltaTime);
+
+  /* draw particles and connecting line */
+  background(255);
+  noFill();
+  stroke(255, 0, 127, 64);
+  line(mSpring.a().position().x, mSpring.a().position().y,
+  mSpring.b().position().x, mSpring.b().position().y);
+  fill(245);
+  stroke(164);
+  ellipse(mSpring.a().position().x, mSpring.a().position().y, 12, 12);
+  ellipse(mSpring.b().position().x, mSpring.b().position().y, 12, 12);
+}
+