mandelbrotCMDinC/main.c at main · Ruby1405/mandelbrotCMDinC · GitHub

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#include <stdio.h>
#include <math.h>

const unsigned int MAX_ITERATIONS = 1000;

unsigned int Iterations (double firstX, double firstY)
{
    unsigned int iteration = 0;

    double x = firstX;
    double y = firstY;

    // Escape time algorithm
    while (x*x + y*y <= 4 && iteration < MAX_ITERATIONS)
    {
        double xNew = x*x - y*y + firstX;
        double yNew = 2*x*y + firstY;

        if (
            (xNew == x && yNew == y) ||
            (xNew == firstX && yNew == firstY)
        )
        {
            return MAX_ITERATIONS; // Point is in the set
        }

        x = xNew;
        y = yNew;

        iteration++;
    }
    return iteration;
}

int main() {
    const float xYZoomRatio = 2;
    const double moveSpeed = 10;
    const double zoomSpeed = 1.3;

    const unsigned int screenWidth = 220;
    const unsigned int screenHeight = 60;

    double zoom = 30.0;

    char charsetLength = 68;
    char charset[] = "@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\\|()1{}[]?-_+~<>i!lI;:,\"^`'.";

    double xCenter = 0.0;
    double yCenter = 0.0;

    while (1)
    {
        for (unsigned int y = 0; y < screenHeight; y++)
        {
            for (unsigned int x = 0; x < screenWidth; x++)
            {
                unsigned int iter = Iterations(
                    (y + yCenter - 45.0) / zoom,
                    (x + xCenter - 110.0) / (zoom * xYZoomRatio)
                );
                if (iter == MAX_ITERATIONS)
                {
                    printf("%c", ' ');
                }
                else
                {
                    printf("%c", charset[(int)powf((iter / (float)MAX_ITERATIONS) * charsetLength, 1.5) % charsetLength]);
                }
            }
            puts("|");
        }

        char decision;
        printf("Current position: (%.2f, %.2f)\n", xCenter, yCenter);
        puts("MOVE: w/a/s/d, ZOOM: q/e, QUIT: x");
        scanf(" %c", &decision);

        switch (decision)
        {
        case 'w':
            yCenter -= moveSpeed;
            break;
        case 'a':
            xCenter -= moveSpeed;
            break;
        case 's':
            yCenter += moveSpeed;
            break;
        case 'd':
            xCenter += moveSpeed;
            break;
        case 'q':
            zoom /= zoomSpeed;
            yCenter /= zoomSpeed;
            xCenter /= zoomSpeed;
            break;
        case 'e':
            zoom *= zoomSpeed;
            yCenter *= zoomSpeed;
            xCenter *= zoomSpeed;
            break;
        case 'x':
            return 0;
            break;
        default:
            puts("Invalid input!");
            break;
        }
    }

    return 0;
}