acid-drop

- Hacking the planet from a LilyGo T-Deck using custom firmware
git clone git://git.acid.vegas/acid-drop.git
Colour_Wheel.ino (1777B)
      1 // Arc drawing example - draw a colour wheel
      2 
      3 #include <TFT_eSPI.h>       // Include the graphics library
      4 TFT_eSPI tft = TFT_eSPI();  // Create object "tft"
      5 
      6 uint16_t colors[12];
      7 
      8 // -------------------------------------------------------------------------
      9 // Setup
     10 // -------------------------------------------------------------------------
     11 void setup(void) {
     12   Serial.begin(115200);
     13   tft.init();
     14   tft.fillScreen(TFT_BLACK);
     15 
     16   // Create the outer ring colours
     17   for (uint8_t c = 0; c < 2; c++) {
     18     colors[c + 10] = tft.alphaBlend(128 + c * 127, TFT_RED,     TFT_MAGENTA);
     19     colors[c +  8] = tft.alphaBlend(128 + c * 127, TFT_MAGENTA, TFT_BLUE);
     20     colors[c +  6] = tft.alphaBlend(128 + c * 127, TFT_BLUE,    TFT_GREEN);
     21     colors[c +  4] = tft.alphaBlend(128 + c * 127, TFT_GREEN,   TFT_YELLOW);
     22     colors[c +  2] = tft.alphaBlend(128 + c * 127, TFT_YELLOW,  TFT_ORANGE);
     23     colors[c +  0] = tft.alphaBlend(128 + c * 127, TFT_ORANGE,  TFT_RED);
     24   }
     25 }
     26 
     27 // -------------------------------------------------------------------------
     28 // Main loop
     29 // -------------------------------------------------------------------------
     30 void loop() {
     31   uint16_t rDelta = (tft.width() - 1) / 10;
     32   uint16_t x = tft.width() / 2;
     33   uint16_t y = tft.height() / 2;
     34   bool smooth = true;
     35 
     36   // Draw rings as a series of arcs, increasingly blend colour with white towards middle
     37   for (uint16_t i = 5; i > 0; i--) {
     38     for (uint16_t angle = 0; angle <= 330; angle += 30) {
     39       uint16_t radius = i * rDelta;
     40       uint16_t wheelColor = tft.alphaBlend((i * 255.0)/5.0, colors[angle / 30], TFT_WHITE);
     41       tft.drawArc(x, y, radius, radius - rDelta, angle, angle + 30, wheelColor, TFT_BLACK, smooth);
     42     }
     43     smooth = false;  // Only outer ring is smooth
     44   }
     45 
     46   while (1) delay(100);
     47 }