java/examples/Basics/Math/SineCosine/applet/SineCosine.java

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+import processing.core.*; 
+
+import java.applet.*; 
+import java.awt.*; 
+import java.awt.image.*; 
+import java.awt.event.*; 
+import java.io.*; 
+import java.net.*; 
+import java.text.*; 
+import java.util.*; 
+import java.util.zip.*; 
+import java.util.regex.*; 
+
+public class SineCosine extends PApplet {
+
+/**
+ * Sine Cosine. 
+ * 
+ * Linear movement with sin() and cos(). 
+ * Numbers between 0 and PI*2 (TWO_PI which is roughly 6.28) 
+ * are put into these functions and numbers between -1 and 1 are 
+ * returned. These values are then scaled to produce larger movements. 
+ */
+ 
+int i = 45;
+int j = 225; 
+float pos1 = 0; 
+float pos2 = 0; 
+float pos3 = 0; 
+float pos4 = 0;
+int sc = 40;
+
+public void setup() 
+{
+  size(200, 200);
+  noStroke();
+  smooth();
+}
+
+public void draw() 
+{
+  background(0);
+  
+  fill(51);
+  rect(60, 60, 80, 80);
+
+  fill(255);
+  ellipse(pos1, 36, 32, 32);
+
+  fill(153);
+  ellipse(36, pos2, 32, 32);
+
+  fill(255);
+  ellipse(pos3, 164, 32, 32);
+
+  fill(153);
+  ellipse(164, pos4, 32, 32);
+
+  i += 3;
+  j -= 3;
+
+  if(i > 405) {
+    i = 45;
+    j = 225;
+  }
+
+  float ang1 = radians(i); // convert degrees to radians
+  float ang2 = radians(j); // convert degrees to radians
+  pos1 = width/2 + (sc * cos(ang1));
+  pos2 = width/2 + (sc * sin(ang1));
+  pos3 = width/2 + (sc * cos(ang2));
+  pos4 = width/2 + (sc * sin(ang2));
+}
+
+
+  static public void main(String args[]) {
+    PApplet.main(new String[] { "SineCosine" });
+  }
+}