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