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plunkerでMandelbrot その2

Posted at

#概要

plunkerでMandelbrotやってみた。

#写真

image.png

#サンプルコード

var ctx = document.getElementById('canvas').getContext('2d');
var KS = 500;
var RST = -3.1;
var RED = 0.9;
var IST = -1.85;
var IED = 1.85;
var DR = (RED - RST) / KS;
var DI = (IED - IST) / KS;

function map(n, v, omin, omax) {
    return n / (omax - omin) * v + v / 2;
};

for (CR = RST; CR <= RED; CR = CR + DR)
{
    for (CI = IST; CI <= IED; CI = CI + DI)
    {
        ZR = 0;
        ZI = 0;
        for (K = 1; K <= 8; K++)
        { 
            if (K == 1) ctx.fillStyle = 'rgb(255, 255, 25)';
            if (K == 2) ctx.fillStyle = 'rgb(255, 25, 255)';
            if (K == 3) ctx.fillStyle = 'rgb(25, 255, 255)';
            if (K == 4) ctx.fillStyle = 'rgb(25, 25, 255)';
            if (K == 5) ctx.fillStyle = 'rgb(25, 255, 25)';
            if (K == 6) ctx.fillStyle = 'rgb(55, 55, 55)';
            if (K == 7) ctx.fillStyle = 'rgb(55, 55, 255)';
            if (K == 8) ctx.fillStyle = 'rgb(255, 55, 255)';
            R = ZR * ZR - ZI * ZI + CR;
            I = 2 * ZR * ZI + CI;
            if ((R * R + I * I) > 4)
            { 
                var x = map(CR, KS, RST, RED);
                var y = map(CI, KS, IST, IED);
                ctx.fillRect(x, y, 1, 1);
                K = 9;
            }
            ZR = R;
            ZI = I;
        }
    }
}






#成果物

以上。

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