public void SetNext(double cx, double cy, double zoom, double maxIterations)
{
src = dst;
dst = new MandelParameters {
CenterX = cx, CenterY = cy, Zoom = zoom, MaxIterations = maxIterations
};
}
private double rotation = 0; // angle in radians of rotation
/// <summary>
/// Simple mandelbrot rendering
/// </summary>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="angle"></param>
/// <param name="renderAction"></param>
void RenderMandelbrot(
int width, int height,
MandelParameters parameters,
double angle,
Action <int, int, int> renderAction
)
{
var cos = Math.Cos(angle);
var sin = Math.Sin(angle);
var m = Math.Max(width, height);
var scale = 2.0 / (parameters.Zoom * m);
double temp;
for (var i = 0; i < width; ++i)
{
for (var j = 0; j < height; ++j)
{
// center pixel
var cx = i - width / 2.0;
var cy = j - height / 2.0;
// zoom in
cx *= scale;
cy *= scale;
// rotate
temp = cx * cos + cy * sin;
cy = -cx * sin + cy * cos;
cx = temp;
// shift
cx += parameters.CenterX;
cy += parameters.CenterY;
// compute iters
// z <- z^2+c, which is
// x+iy <- (x+iy)^2+(cx+icy), which is
// x <- x^2 - y^2 + cx and y <- 2xy+curCenterY
double x = cx, y = cy;
var count = 0;
var maxIters = (int)parameters.MaxIterations;
while (count < maxIters)
{
if (x * x + y * y > 4.0)
{
break;
}
temp = x * x - y * y + cx;
y = 2 * x * y + cy;
x = temp;
++count;
}
renderAction(i, j, count);
}
}
}
