private async Task CalculateBitmapPart(Bitmap bitmap, int fromHeight, int toHeight, Additional.DrawMode drawMode)
{
int width = bitmap.Width;
double xmin = -1.5;
double ymin = -1.2;
double xmax = 1.5;
double ymax = 1.5;
double p = 0.32, q = 0.04;
int W = 600;
int H = 600;
double dx = (xmax - xmin) / (W - 1);
double dy = (ymax - ymin) / (H - 1);
double x, y, X, Y, Cx, Cy;
for (int ax = fromHeight; ax < toHeight; ax++)
{
for (int bx = 0; bx < width; bx++)
{
x = xmin + ax * dx;
y = ymin + bx * dy;
Cx = x;
Cy = y;
X = x;
Y = y;
double ix = 0, iy = 0, n = 0;
while ((ix * ix + iy * iy < 4) && (n < 64))
{
switch (drawMode)
{
case Additional.DrawMode.Standard:
ix = X * X - Y * Y + Cx;
iy = 2 * X * Y + Cy;
break;
case Additional.DrawMode.Custom:
ix = X * X - Y * Y - p * p * p + 3 * p * q;
iy = 2 * X * Y - 3 * q * p * p + p * p * p;
break;
}
n++;
X = ix;
Y = iy;
}
n = 255 - n;
Color color = Color.FromArgb((int)n, (int)n, (int)n);
bitmap.SetPixel(bx, ax, color);
}
}
using (Bitmap cpy = (Bitmap)bitmap.Clone())
{
texture.Destroy(openGLControl.OpenGL);
texture.Create(openGLControl.OpenGL, cpy);
}
await Task.Yield();
}
private void modeComboBox_SelectedIndexChanged(object sender, System.EventArgs e) => drawMode = (Additional.DrawMode)modeComboBox.SelectedIndex;
