WasmScreenCoords.ino

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#include <Arduino.h>
#include <FastLED.h>
 
 
#ifdef __EMSCRIPTEN__
 
#include "fl/vector.h"
 
 
#include "fl/json.h"
#include "fl/slice.h"
#include "fl/screenmap.h"
#include "fl/math_macros.h"
 
using fl::vec2f;
using fl::vector;
 
 
#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, fl::vector<vec2f>* _map) {
    float x = 0;
    float y = 0;
    fl::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);
    fl::vector<vec2f> map;
    make_map(1, 1, NUM_LEDS, &map);
    fl::ScreenMap screenmap = fl::ScreenMap(map.data(), map.size());
 
    fl::vector<fl::vec2f> map2;
    make_map(-1, -1, NUM_LEDS, &map2);
    fl::ScreenMap screenmap2 = fl::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();
}
 
 
#else
 
void setup() {
    Serial.begin(115200);
    Serial.println("setup");
}
 
void loop() {
    Serial.println("loop");
}
 
#endif  // __EMSCRIPTEN__