directory move

picocalc/libraries/TFT_eSPI/examples/Smooth Graphics/Draw_Arc/Draw_Arc.ino

@@ -0,0 +1,53 @@
+// Example for drawArc function. This is intended for arc based meters.
+// (See arcMeter example)
+
+// Draws arcs without smooth ends, suitable for dynamically changing arc
+// angles to avoid residual anti-alias pixels at the arc segment joints.
+
+// The sides of the arc can optionally be smooth or not. Smooth arcs have
+// a much better appearance, especially at small sizes.
+
+#include <TFT_eSPI.h>       // Include the graphics library
+TFT_eSPI tft = TFT_eSPI();  // Create object "tft"
+
+// -------------------------------------------------------------------------
+// Setup
+// -------------------------------------------------------------------------
+void setup(void) {
+  Serial.begin(115200);
+
+  tft.init();
+  tft.setRotation(1);
+  tft.fillScreen(TFT_BLACK);
+}
+
+// -------------------------------------------------------------------------
+// Main loop
+// -------------------------------------------------------------------------
+void loop()
+{
+  static uint32_t count = 0;
+
+  uint16_t fg_color = random(0x10000);
+  uint16_t bg_color = TFT_BLACK;       // This is the background colour used for smoothing (anti-aliasing)
+
+  uint16_t x = random(tft.width());  // Position of centre of arc
+  uint16_t y = random(tft.height());
+
+  uint8_t radius       = random(20, tft.width() / 4); // Outer arc radius
+  uint8_t thickness    = random(1, radius / 4);     // Thickness
+  uint8_t inner_radius = radius - thickness;        // Calculate inner radius (can be 0 for circle segment)
+
+  // 0 degrees is at 6 o'clock position
+  // Arcs are drawn clockwise from start_angle to end_angle
+  // Start angle can be greater than end angle, the arc will then be drawn through 0 degrees
+  uint16_t start_angle = random(361); // Start angle must be in range 0 to 360
+  uint16_t end_angle   = random(361); // End angle must be in range 0 to 360
+
+  bool smooth = random(2); // true = smooth sides, false = no smooth sides
+
+  tft.drawArc(x, y, radius, inner_radius, start_angle, end_angle, fg_color, bg_color, smooth);
+
+  count++;
+  if (count < 30) delay(500); // After 15s draw as fast as possible!
+}