radiating rainbow colors from center

RGBShades.ino

@@ -56,7 +56,8 @@ void setup() {
 }
 
 // list of functions that will be displayed
-functionList effectList[] = {threeSine,
+functionList effectList[] = {radiateCenter,
+                             threeSine,
                              threeDee,
                              scrollTextOne,
                              plasma,

effects.h

@@ -6,6 +6,32 @@
 //    * All animation should be controlled with counters and effectDelay, no delay() or loops
 //    * Pixel data should be written using leds[XY(x,y)] to map coordinates to the RGB Shades layout
 
+
+// radiating inward rainbow colors
+void radiateCenter() {
+  static byte offset  = 9; // counter for radial color wave motion
+  static int plasVector = 0; // counter for orbiting plasma center
+
+  // startup tasks
+  if (effectInit == false) {
+    effectInit = true;
+    effectDelay = 0;
+  }
+
+  int xOffset = 0;
+  int yOffset = 4;
+
+  // Draw one frame of the animation into the LED array
+  for (int x = 0; x < kMatrixWidth; x++) {
+    for (int y = 0; y < kMatrixHeight; y++) {
+      byte color = sin8(sqrt(sq(((float)x - 7.5) * 12 + xOffset) + sq(((float)y - 2) * 12 + yOffset)) + offset);
+      leds[XY(x, y)] = ColorFromPalette(currentPalette, color, 255);
+    }
+  }
+  offset--; // wraps at 255 for sin8
+  plasVector += 1; // using an int for slower orbit (wraps at 65536)
+}
+
 // Triple Sine Waves
 byte sineOffset = 0; // counter for current position of sine waves
 void threeSine() {
@@ -388,4 +414,4 @@ void scrollTextOne() {
 
 void scrollTextTwo() {
   scrollText(2, NORMAL, CRGB::Green, CRGB(0,0,8));
-}
+}