48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
// Arc drawing example - draw a colour wheel
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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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uint16_t colors[12];
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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.fillScreen(TFT_BLACK);
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// Create the outer ring colours
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for (uint8_t c = 0; c < 2; c++) {
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colors[c + 10] = tft.alphaBlend(128 + c * 127, TFT_RED, TFT_MAGENTA);
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colors[c + 8] = tft.alphaBlend(128 + c * 127, TFT_MAGENTA, TFT_BLUE);
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colors[c + 6] = tft.alphaBlend(128 + c * 127, TFT_BLUE, TFT_GREEN);
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colors[c + 4] = tft.alphaBlend(128 + c * 127, TFT_GREEN, TFT_YELLOW);
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colors[c + 2] = tft.alphaBlend(128 + c * 127, TFT_YELLOW, TFT_ORANGE);
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colors[c + 0] = tft.alphaBlend(128 + c * 127, TFT_ORANGE, TFT_RED);
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}
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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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uint16_t rDelta = (tft.width() - 1) / 10;
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uint16_t x = tft.width() / 2;
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uint16_t y = tft.height() / 2;
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bool smooth = true;
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// Draw rings as a series of arcs, increasingly blend colour with white towards middle
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for (uint16_t i = 5; i > 0; i--) {
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for (uint16_t angle = 0; angle <= 330; angle += 30) {
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uint16_t radius = i * rDelta;
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uint16_t wheelColor = tft.alphaBlend((i * 255.0)/5.0, colors[angle / 30], TFT_WHITE);
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tft.drawArc(x, y, radius, radius - rDelta, angle, angle + 30, wheelColor, TFT_BLACK, smooth);
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}
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smooth = false; // Only outer ring is smooth
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}
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while (1) delay(100);
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}
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