C++ version

.gitignore

@@ -0,0 +1 @@
+.vscode

wallart.ino

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+#include <FastLED.h>
+
+#define NEOPIXEL_PIN 2
+#define GRIDLEN 50
+
+#define MILLISECOND 1
+#define SECOND (1000 * MILLISECOND)
+
+CRGB grid[GRIDLEN];
+
+void fade() {
+  int reps = 300 + random(GRIDLEN);
+  int hue = random(256);
+  for (int i = 0; i < reps; i++) {
+    FastLED.clear();
+    for (int pos = 0; pos < 8; pos++) {
+      grid[(i+pos) % GRIDLEN] = CHSV(hue, 255, pos * 32);
+    }
+    FastLED.show();
+    delay(80);
+  }
+}
+
+void singleCursor() {
+  for (int i = 0; i < 80; i++) {
+    grid[20] = CHSV(0, 210, 127 * (i%2));
+    FastLED.show();
+    delay(120);
+  }
+}
+
+#define NUM_SPARKS 3
+void sparkle() {
+  int pos[NUM_SPARKS] = {0};
+  for (int i = 0; i < 50; i++) {
+    for (int j = 0; j < NUM_SPARKS; j++) {
+      pos[j] = random(GRIDLEN);
+      grid[pos[j]] = CRGB::Gray;
+    }
+    FastLED.show();
+    for (int j = 0; j < NUM_SPARKS; j++) {
+      grid[pos[j]] = CRGB::Black;
+    }
+    delay(40);
+  }
+}
+
+#define NUM_GLITCH 4
+#define GLITCH_FRAMES 64
+void glitchPulse() {
+  int steps[NUM_GLITCH] = {0};
+  int pos[NUM_GLITCH] = {0};
+  CRGB color[NUM_GLITCH];
+
+  for (int i = 0; i < NUM_GLITCH; i++) {
+    steps[i] = GLITCH_FRAMES / NUM_GLITCH * i;
+    color[i] = CRGB::Brown;
+  }
+  
+  for (int frame = 0; frame < 1000; frame++) {
+    for (int i = 0; i < NUM_GLITCH; i++) {
+      if (steps[i] == 0) {
+        steps[i] = GLITCH_FRAMES;
+        pos[i] = random(GRIDLEN);
+        color[i] = CHSV(random(256), 64 + random(64), 255);
+      } 
+      CRGB c = color[i];
+      int bmask = (0xff * steps[i] / 32) & 0xff;
+      if (steps[i] == GLITCH_FRAMES/2) {
+        bmask = 0xff - bmask;
+      }
+      c.red &= bmask;
+      c.green &= bmask;
+      c.blue &= bmask;
+      grid[pos[i]] = c;
+      steps[i]--;
+    }
+    FastLED.show();
+    delay(100);
+  }
+
+}
+
+void setup() {
+  FastLED.addLeds<WS2812, NEOPIXEL_PIN, RGB>(grid, GRIDLEN);
+  FastLED.setBrightness(52);
+  pinMode(LED_BUILTIN, OUTPUT);
+}
+
+void loop() {
+  fade();
+  singleCursor();
+  sparkle();
+  glitchPulse();
+}