100 lines
2.1 KiB
C++
100 lines
2.1 KiB
C++
// Spiro
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// Rainbow patern generator
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#include <TFT_eSPI.h> // Hardware-specific library
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#include <SPI.h>
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TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
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#define DEG2RAD 0.0174532925 // Convert angles in degrees to radians
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unsigned long runTime = 0;
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float sx = 0, sy = 0;
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uint16_t x0 = 0, x1 = 0, yy0 = 0, yy1 = 0;
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void setup()
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{
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//randomSeed(analogRead(A0));
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// Setup the LCD
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tft.init();
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tft.setRotation(3);
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}
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void loop()
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{
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runTime = millis();
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tft.fillScreen(TFT_BLACK);
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int n = random(2, 23), r = random(20, 100), colour = 0; //rainbow();
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for (long i = 0; i < (360 * n); i++) {
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sx = cos((i / n - 90) * DEG2RAD);
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sy = sin((i / n - 90) * DEG2RAD);
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x0 = sx * (120 - r) + 159;
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yy0 = sy * (120 - r) + 119;
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sy = cos(((i % 360) - 90) * DEG2RAD);
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sx = sin(((i % 360) - 90) * DEG2RAD);
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x1 = sx * r + x0;
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yy1 = sy * r + yy0;
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tft.drawPixel(x1, yy1, rainbow(map(i%360,0,360,0,127))); //colour);
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}
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r = random(20, 100);//r = r / random(2,4);
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for (long i = 0; i < (360 * n); i++) {
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sx = cos((i / n - 90) * DEG2RAD);
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sy = sin((i / n - 90) * DEG2RAD);
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x0 = sx * (120 - r) + 159;
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yy0 = sy * (120 - r) + 119;
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sy = cos(((i % 360) - 90) * DEG2RAD);
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sx = sin(((i % 360) - 90) * DEG2RAD);
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x1 = sx * r + x0;
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yy1 = sy * r + yy0;
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tft.drawPixel(x1, yy1, rainbow(map(i%360,0,360,0,127))); //colour);
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}
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delay(2000);
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}
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unsigned int rainbow(int value)
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{
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// Value is expected to be in range 0-127
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// The value is converted to a spectrum colour from 0 = blue through to red = blue
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//int value = random (128);
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byte red = 0; // Red is the top 5 bits of a 16 bit colour value
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byte green = 0;// Green is the middle 6 bits
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byte blue = 0; // Blue is the bottom 5 bits
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byte quadrant = value / 32;
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if (quadrant == 0) {
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blue = 31;
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green = 2 * (value % 32);
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red = 0;
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}
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if (quadrant == 1) {
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blue = 31 - (value % 32);
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green = 63;
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red = 0;
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}
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if (quadrant == 2) {
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blue = 0;
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green = 63;
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red = value % 32;
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}
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if (quadrant == 3) {
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blue = 0;
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green = 63 - 2 * (value % 32);
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red = 31;
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}
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return (red << 11) + (green << 5) + blue;
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}
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