Initial Commit

Java/Processing/processing-3.3.6/modes/java/examples/Basics/Math/PolarToCartesian/PolarToCartesian.pde

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+/**
+ * PolarToCartesian
+ * by Daniel Shiffman.  
+ * 
+ * Convert a polar coordinate (r,theta) to cartesian (x,y):  
+ * x = r * cos(theta)
+ * y = r * sin(theta)
+ */
+ 
+float r;
+
+// Angle and angular velocity, accleration
+float theta;
+float theta_vel;
+float theta_acc;
+
+void setup() {
+  size(640, 360);
+  
+  // Initialize all values
+  r = height * 0.45;
+  theta = 0;
+  theta_vel = 0;
+  theta_acc = 0.0001;
+}
+
+void draw() {
+  
+  background(0);
+  
+  // Translate the origin point to the center of the screen
+  translate(width/2, height/2);
+  
+  // Convert polar to cartesian
+  float x = r * cos(theta);
+  float y = r * sin(theta);
+  
+  // Draw the ellipse at the cartesian coordinate
+  ellipseMode(CENTER);
+  noStroke();
+  fill(200);
+  ellipse(x, y, 32, 32);
+  
+  // Apply acceleration and velocity to angle (r remains static in this example)
+  theta_vel += theta_acc;
+  theta += theta_vel;
+
+}
+
+
+
+