//Zoom in (or out) to the window (=pixel) coordinates specified
public void Crop(int x1, int y1, int x2, int y2)
{
//Window coordinates to mandelbrot coordinates
double xreal_start, yreal_start, xreal_end, yreal_end;
WindowCoordsToMandlebrot(x1, y1, 1, out xreal_start, out yreal_start);
WindowCoordsToMandlebrot(x2, y2, 1, out xreal_end, out yreal_end);
//Make sure the crop won't get flipped
CoordinateUtilities.FixRect(ref xreal_start, ref yreal_start, ref xreal_end, ref yreal_end);
//Make sure you can't zoom out too much
if (xreal_start < -2)
{
xreal_start = -2;
}
if (yreal_start < -2)
{
yreal_start = -2;
}
if (xreal_end > 2)
{
xreal_end = 2;
}
if (yreal_end > 2)
{
yreal_end = 2;
}
MandelbrotX = xreal_start;
MandelbrotY = yreal_start;
MandelbrotWidth = xreal_end - xreal_start;
MandelbrotHeight = yreal_end - yreal_start;
//Fix the aspect ratio of the mandelbrot figure
FixAspect();
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
if (mMandelbrotBitmap != null)
{
if (mMandlebrotZoomer != null)
{
//Draw a zoomed mandelbrot image when the animation is running
Rectangle bmRegion = mMandlebrotZoomer.GetLatestValue();
if (mMandelbrotBitmapX2)
{
bmRegion.X *= 2;
bmRegion.Y *= 2;
bmRegion.Width *= 2;
bmRegion.Height *= 2;
}
e.Graphics.DrawImage(mMandelbrotBitmap, new Rectangle(0, 0, panel1.Width, panel1.Height), bmRegion, GraphicsUnit.Pixel);
}
else
{
e.Graphics.DrawImage(mMandelbrotBitmap, 0, 0, panel1.Width, panel1.Height);
}
}
if (mIsMouseDown)
{
//Draw a nice box when zooming in by mouse drag
int x1 = mMouseDownPoint.X;
int x2 = mCurMousePoint.X;
int y1 = mMouseDownPoint.Y;
int y2 = mCurMousePoint.Y;
CoordinateUtilities.FixRect(ref x1, ref y1, ref x2, ref y2);
e.Graphics.DrawRectangle(Pens.White, x1, y1, x2 - x1, y2 - y1);
}
}
//Zoom the mandelbrot with a nice animation
private void AnimateZoom(int x1, int y1, int x2, int y2)
{
if (x1 == x2 || y1 == y2)
{
return;
}
//Make sure the top-left and bottom-right coords are not reversed
CoordinateUtilities.FixRect(ref x1, ref y1, ref x2, ref y2);
mMandelbrotGenerator.Crop(x1, y1, x2, y2);
//Setup the RectangleAnimator
mMandlebrotZoomer =
new RectangleAnimator(
new Rectangle(0, 0, panel1.Width, panel1.Height),
new Rectangle(x1, y1, x2 - x1, y2 - y1), 10);
//Start the animation thread with a high priority to get the smoothest animation possible
new Thread(AnimThread)
{
Priority = ThreadPriority.Highest
}.Start();
UpdateMandelbrot();
}