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libraries/FastLED/examples/Blur2d/Blur2d.ino

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+// UIDescription: This example shows how to blur a strip of LEDs in 2d.
+
+#include "fl/ui.h"
+#include "fl/xymap.h"
+#include <FastLED.h>
+
+using namespace fl;
+
+#define WIDTH 22
+#define HEIGHT 22
+
+#define NUM_LEDS (WIDTH * HEIGHT)
+#define BLUR_AMOUNT 172
+#define DATA_PIN 2 // Change this to match your LED strip's data pin
+#define BRIGHTNESS 255
+#define SERPENTINE true
+
+CRGB leds[NUM_LEDS];
+uint8_t pos = 0;
+bool toggle = false;
+XYMap xymap(WIDTH, HEIGHT, SERPENTINE);
+
+void setup() {
+    FastLED.addLeds<WS2812B, DATA_PIN, GRB>(leds, NUM_LEDS)
+      .setScreenMap(xymap);  // Necessary when using the FastLED web compiler to display properly on a web page.
+    FastLED.setBrightness(BRIGHTNESS);
+}
+
+void loop() {
+    static int x = random(WIDTH);
+    static int y = random(HEIGHT);
+    static CRGB c = CRGB(0, 0, 0);
+    blur2d(leds, WIDTH, HEIGHT, BLUR_AMOUNT, xymap);
+    EVERY_N_MILLISECONDS(1000) {
+        x = random(WIDTH);
+        y = random(HEIGHT);
+        uint8_t r = random(255);
+        uint8_t g = random(255);
+        uint8_t b = random(255);
+        c = CRGB(r, g, b);
+    }
+    leds[xymap(x, y)] = c;
+    FastLED.show();
+    delay(20);
+}