acidportal

- 😈 Worlds smallest Evil Portal on a LilyGo T-QT
git clone git://git.acid.vegas/acidportal.git
Draw_Arc.ino (2078B)
      1 // Example for drawArc function. This is intended for arc based meters.
      2 // (See arcMeter example)
      3 
      4 // Draws arcs without smooth ends, suitable for dynamically changing arc
      5 // angles to avoid residual anti-alias pixels at the arc segment joints.
      6 
      7 // The sides of the arc can optionally be smooth or not. Smooth arcs have
      8 // a much better appearance, especially at small sizes.
      9 
     10 #include <TFT_eSPI.h>       // Include the graphics library
     11 TFT_eSPI tft = TFT_eSPI();  // Create object "tft"
     12 
     13 // -------------------------------------------------------------------------
     14 // Setup
     15 // -------------------------------------------------------------------------
     16 void setup(void) {
     17   Serial.begin(115200);
     18 
     19   tft.init();
     20   tft.setRotation(1);
     21   tft.fillScreen(TFT_BLACK);
     22 }
     23 
     24 // -------------------------------------------------------------------------
     25 // Main loop
     26 // -------------------------------------------------------------------------
     27 void loop()
     28 {
     29   static uint32_t count = 0;
     30 
     31   uint16_t fg_color = random(0x10000);
     32   uint16_t bg_color = TFT_BLACK;       // This is the background colour used for smoothing (anti-aliasing)
     33 
     34   uint16_t x = random(tft.width());  // Position of centre of arc
     35   uint16_t y = random(tft.height());
     36 
     37   uint8_t radius       = random(20, tft.width() / 4); // Outer arc radius
     38   uint8_t thickness    = random(1, radius / 4);     // Thickness
     39   uint8_t inner_radius = radius - thickness;        // Calculate inner radius (can be 0 for circle segment)
     40 
     41   // 0 degrees is at 6 o'clock position
     42   // Arcs are drawn clockwise from start_angle to end_angle
     43   // Start angle can be greater than end angle, the arc will then be drawn through 0 degrees
     44   uint16_t start_angle = random(361); // Start angle must be in range 0 to 360
     45   uint16_t end_angle   = random(361); // End angle must be in range 0 to 360
     46 
     47   bool smooth = random(2); // true = smooth sides, false = no smooth sides
     48 
     49   tft.drawArc(x, y, radius, inner_radius, start_angle, end_angle, fg_color, bg_color, smooth);
     50 
     51   count++;
     52   if (count < 30) delay(500); // After 15s draw as fast as possible!
     53 }