85 lines
3.3 KiB
C++
85 lines
3.3 KiB
C++
// 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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// Start angle for drawArc must be smaller than end angle
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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 for drawArc must be smaller than end angle (function will swap them otherwise)
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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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//tft.drawArc(x, y, radius, inner_radius, start_angle, end_angle, fg_color, bg_color); // always smooth sides if parameter is missing
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// The following function allows arcs to be drawn through the 6 o'clock position by drawing in 2 segments if
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// the start angle is greater than the end angle
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//drawAnyArc(x, y, radius, inner_radius, start_angle, end_angle, fg_color, bg_color, smooth); // smooth sides if parameter is missing
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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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// The following function allows arcs to be drawn through the 0 degree position by drawing in 2 segments
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// Function prototype with default smooth setting
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void drawAnyArc(int32_t x, int32_t y, int32_t r, int32_t ir, int32_t startAngle, int32_t endAngle,
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uint32_t fg_color, uint32_t bg_color, bool smooth = true);
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void drawAnyArc(int32_t x, int32_t y, int32_t r, int32_t ir, int32_t startAngle, int32_t endAngle,
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uint32_t fg_color, uint32_t bg_color, bool smooth)
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{
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if (endAngle > startAngle)
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{
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// Draw arc in single sweep
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tft.drawArc(x, y, r, ir, startAngle, endAngle, fg_color, bg_color);
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}
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else
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{
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// Arc sweeps through 6 o'clock so draw in two parts
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tft.drawArc(x, y, r, ir, startAngle, 360, fg_color, bg_color);
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tft.drawArc(x, y, r, ir, 0, endAngle, fg_color, bg_color);
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}
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}
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