帽子のグラフ表示

m5stackHatGraph.ino

//移植元はこちらです。
//https://twitter.com/yanatoku/status/1043501621030703104
//https://twitter.com/Stosstruppe/status/1245682316325740545
//https://twitter.com/Stosstruppe/status/1246383338635407365

#include <M5Stack.h>

int dt[256], db[256];

void setup(void) {
  M5.begin();
  M5.Lcd.fillScreen(BLACK);

  for (int l = 0; l < 256; l++) {
    dt[l] = 192;
    db[l] = -1;
  }
  for (int y = -180; y <= 180; y = y + 4) {
    for (int x = -180; x <= 180; x = x + 4) {
      double r = 3.14 / 180 * sqrt(x * x + y * y);
      double z = 100 * cos(r) - 30 * cos(3 * r);
      int sx = (int)(128 + x / 2 - y / 4);
      int sy = (int)(80 - y / 4 - z / 2);
      boolean ps = false;
      if(sx < 0|| sx > 255){
        continue;
      }
      if (dt[sx] > sy) {
        dt[sx] = sy;
        ps = true;
      }
      if (db[sx] < sy) {
        db[sx] = sy;
        ps = true;
      }
      if (ps == true) {
        M5.Lcd.drawPixel(sx + 30, sy + 20, TFT_GREEN);
      }
    }
  }
}

void loop(void) {

}