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libraries/FastLED/examples/WasmScreenCoords/WasmScreenCoords.ino

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+/// @file    WasmScreenCoords.ino
+/// @brief   Simple test for screen coordinates in the web compiled version of FastLED.
+/// @author  Zach Vorhies
+///
+/// This sketch is fully compatible with the FastLED web compiler. To use it do the following:
+/// 1. Install Fastled: `pip install fastled`
+/// 2. cd into this examples page.
+/// 3. Run the FastLED web compiler at root: `fastled`
+
+
+// printf
+#include <stdio.h>
+#include <string>
+#include <vector>
+
+#include <FastLED.h>
+#include "fl/json.h"
+#include "fl/slice.h"
+#include "fl/screenmap.h"
+#include "fl/math_macros.h"
+
+
+
+#define LED_PIN 3
+#define BRIGHTNESS 96
+#define COLOR_ORDER GRB
+#define NUM_LEDS 256
+
+CRGB leds[NUM_LEDS];
+CRGB leds2[NUM_LEDS];
+
+
+void make_map(int stepx, int stepy, int num, std::vector<vec2f>* _map) {
+    float x = 0;
+    float y = 0;
+    std::vector<vec2f>& map = *_map;
+    for (int16_t i = 0; i < num; i++) {
+        map.push_back(vec2f{x, y});
+        x += stepx;
+        y += stepy;
+    }
+}
+
+void setup() {
+    for (CRGB& c : leds) {
+        c = CRGB::Blue;
+    }
+    for (CRGB& c : leds2) {
+        c = CRGB::Red;
+    }
+    FastLED.setBrightness(255);
+    std::vector<vec2f> map;
+    make_map(1, 1, NUM_LEDS, &map);
+    ScreenMap screenmap = ScreenMap(map.data(), map.size());
+
+    std::vector<vec2f> map2;
+    make_map(-1, -1, NUM_LEDS, &map2);
+    ScreenMap screenmap2 = ScreenMap(map2.data(), map2.size());
+
+    FastLED.addLeds<WS2811, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS)
+        .setScreenMap(screenmap);
+
+    FastLED.addLeds<WS2811, LED_PIN+1, COLOR_ORDER>(leds2, NUM_LEDS)
+        .setScreenMap(screenmap2);
+}
+
+void loop() {
+    FastLED.show();
+}
+
+