74 lines
1.5 KiB
Arduino
74 lines
1.5 KiB
Arduino
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#include "Inkplate.h"
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#define MAXITERATIONS 150
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Inkplate display(INKPLATE_1BIT);
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// Takes a long time to render, cca 3 minutes
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// Explore different positions to draw
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// Some interesting ones can be found here http://www.cuug.ab.ca/dewara/mandelbrot/Mandelbrowser.html
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double xFrom = -0.7423, xTo = -0.8463;
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double yFrom = 0.1092, yTo = 0.2102;
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void setup()
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{
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Serial.begin(115200);
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display.begin();
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}
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void loop()
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{
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display.clearDisplay();
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for (int j = 0; j < 600; ++j)
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{
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for (int i = 0; i < 800; ++i)
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display.drawPixel(
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i, j, colorAt(xFrom + (double)i * (xTo - xFrom) / 800.0, yFrom + (double)j * (yTo - yFrom) / 600.0));
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// for whole set:
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// display.drawPixel(i, j, colorAt(-2.0 + (3.0 * (double)i / 800.0), -1.0 + 2.0 * (double)j / 600.0));
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Serial.println(j);
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}
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display.display();
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delay(5000);
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}
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struct complex
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{
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double re;
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double im;
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};
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void addComplex(struct complex *z, struct complex *c)
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{
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z->re += c->re;
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z->im += c->im;
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}
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void squareComplex(struct complex *z)
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{
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double re = z->re;
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double im = z->im;
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z->re = re * re - im * im;
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z->im = 2 * re * im;
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}
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double modulusComplexSqr(struct complex *z)
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{
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return z->re * z->re + z->im * z->im;
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}
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uint8_t colorAt(double x, double y)
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{
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struct complex z = {0.0, 0.0};
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struct complex c = {x, y};
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int i;
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for (i = 0; i < MAXITERATIONS && modulusComplexSqr(&z) <= 4.0; ++i)
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{
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squareComplex(&z);
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addComplex(&z, &c);
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}
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return i == MAXITERATIONS;
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}
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