Add 'practicing-processing/' from commit 'a863dc99fc5e1967264c286f2adf2b27b50585ef'

git-subtree-dir: practicing-processing
git-subtree-mainline: d40d570281
git-subtree-split: a863dc99fc

practicing-processing/sketchbook/WaveGradient/WaveGradient.pde

@@ -0,0 +1,42 @@
+/**
+ * Wave Gradient
+ * by Ira Greenberg.
+ *
+ * Generate a gradient along a sin() wave.
+ */
+
+float angle = 0;
+float px = 0, py = 0;
+float amplitude = 30;
+float frequency = 0;
+float fillGap = 2.5;
+color c;
+
+int colorRange = 255;
+int ncycles = 500;
+
+void setup() {
+  size(640, 360);
+  background(200);
+  noLoop();
+}
+
+void draw() {
+  for (int i =- ncycles; i < height+ncycles; i++){
+    // Reset angle to 0, so waves stack properly
+    angle = 0;
+    // Increasing frequency causes more gaps
+    frequency+=.01;
+    for (float j = 0; j < width+ncycles; j++){
+      py = i + sin(radians(angle)) * amplitude;
+      angle += frequency;
+      c =  color(abs(py-i)*colorRange/amplitude, colorRange-abs(py-i)*colorRange/amplitude, j*((colorRange * 1.0)/(width+(int)(ncycles * 0.66))));
+      // Hack to fill gaps. Raise value of fillGap if you increase frequency
+      for (int filler = 0; filler < fillGap; filler++){
+        set(int(j-filler), int(py)-filler, c);
+        set(int(j), int(py), c);
+        set(int(j+filler), int(py)+filler, c);
+      }
+    }
+  }
+}