Initial Commit

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

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+/**
+ * Sine Wave
+ * by Daniel Shiffman.  
+ * 
+ * Render a simple sine wave. 
+ */
+ 
+int xspacing = 16;   // How far apart should each horizontal location be spaced
+int w;              // Width of entire wave
+
+float theta = 0.0;  // Start angle at 0
+float amplitude = 75.0;  // Height of wave
+float period = 500.0;  // How many pixels before the wave repeats
+float dx;  // Value for incrementing X, a function of period and xspacing
+float[] yvalues;  // Using an array to store height values for the wave
+
+void setup() {
+  size(640, 360);
+  w = width+16;
+  dx = (TWO_PI / period) * xspacing;
+  yvalues = new float[w/xspacing];
+}
+
+void draw() {
+  background(0);
+  calcWave();
+  renderWave();
+}
+
+void calcWave() {
+  // Increment theta (try different values for 'angular velocity' here
+  theta += 0.02;
+
+  // For every x value, calculate a y value with sine function
+  float x = theta;
+  for (int i = 0; i < yvalues.length; i++) {
+    yvalues[i] = sin(x)*amplitude;
+    x+=dx;
+  }
+}
+
+void renderWave() {
+  noStroke();
+  fill(255);
+  // A simple way to draw the wave with an ellipse at each location
+  for (int x = 0; x < yvalues.length; x++) {
+    ellipse(x*xspacing, height/2+yvalues[x], 16, 16);
+  }
+}
+