コード例 #1
0
ファイル: JuliaSetJob.cs プロジェクト: andybak/Form3D
    // Do threaded task. DON'T use the Unity API here
    protected override void ThreadFunction()
    {
        double moveX = 0;
        double moveY = 0;

        hsbPixelMap = new ColourUtility.HSBColour[width, height];
        rgbPixelMap = new ColourUtility.RGBColour[width, height];

        int x = 0;
        int y = 0;

        //each iteration, it calculates: new = old*old + c, where c is a constant and old starts at current pixel
        double cRe, cIm;                   //real and imaginary part of the constant c, determinate shape of the Julia Set
        double newRe, newIm, oldRe, oldIm; //real and imaginary parts of new and old

        //pick some values for the constant c, this determines the shape of the Julia Set
        cRe = -0.7;
        cIm = 0.27015;

        //loop through every pixel
        for (x = 0; x < width; x++)
        {
            for (y = 0; y < height; y++)
            {
                //calculate the initial real and imaginary part of z, based on the pixel location and zoom and position values
                newRe = 1.5 * (x - width / 2) / (0.5 * zoom * width) + moveX;
                newIm = (y - height / 2) / (0.5 * zoom * height) + moveY;
                //i will represent the number of iterations
                int i;
                //start the iteration process
                for (i = 0; i < maxIterations; i++)
                {
                    //remember value of previous iteration
                    oldRe = newRe;
                    oldIm = newIm;
                    //the actual iteration, the real and imaginary part are calculated
                    newRe = oldRe * oldRe - oldIm * oldIm + cRe;
                    newIm = 2 * oldRe * oldIm + cIm;
                    //if the point is outside the circle with radius 2: stop
                    if ((newRe * newRe + newIm * newIm) > 4)
                    {
                        break;
                    }
                }

                //colour black if max iterations exceeded
                ColourUtility.HSBColour hsbColour = new ColourUtility.HSBColour(0, 0, 0);
                if (i < maxIterations)
                {
                    float hue = ((float)(i % 256)) / 256;
                    hsbColour.hue        = hue;
                    hsbColour.saturation = 1;
                    hsbColour.brightness = hue;
                }
                ColourUtility.RGBColour rgbColour = ColourUtility.rgbFromHSB(hsbColour.hue,
                                                                             hsbColour.saturation,
                                                                             hsbColour.brightness);

                //set pixel map for colour cycling
                hsbPixelMap[x, y] = hsbColour;
                rgbPixelMap[x, y] = rgbColour;
            }
        }
    }