private void ScreenSaverForm_Shown(object sender, EventArgs e)
{
Graphics formGraphics = this.CreateGraphics();
formGraphics.DrawImageUnscaled(this.initialFractalBitmap, 0, 0);
this.stopwatch.Restart();
Task.Run(() =>
{
while (true)
{
RectangleD fractalArea = this.initialFractalArea;
var currentBitmap = this.initialFractalBitmap.Clone() as Bitmap;
for (int zoom = 1; zoom < 10; zoom++)
{
Rectangle zoomRectangle = Mandelbrot.GetNextZoomRectangle(currentBitmap);
// If couldn't find suitable area to zoom in, zoom out to starting fractal and start over.
if (zoomRectangle == Rectangle.Empty)
{
break;
}
fractalArea = Mandelbrot.GetNextZoomArea(this.Size, zoomRectangle.Location, fractalArea);
Bitmap nextBitmap = Mandelbrot.RenderFractal(this.Size, fractalArea, BaseMaximumIterations * (zoom + 1), this.colorFunction);
IntPtr[] nativeZoomInBitmapHandles = CreateNativeZoomInBitmaps(currentBitmap, nextBitmap, zoomRectangle.Location);
// Wait a bit between zooms, even if all computations are complete.
this.stopwatch.Stop();
if (this.stopwatch.ElapsedMilliseconds < WaitMilliseconds)
{
Thread.Sleep(WaitMilliseconds - (int)this.stopwatch.ElapsedMilliseconds);
}
AnimateBlink(formGraphics, currentBitmap, zoomRectangle);
AnimateZoomIn(formGraphics, nativeZoomInBitmapHandles, this.Size);
this.stopwatch.Restart();
// Clean up animation bitmaps after use.
foreach (IntPtr nativeZoomInBitmapHandle in nativeZoomInBitmapHandles)
{
NativeMethods.GDI32.DeleteObject(nativeZoomInBitmapHandle);
}
currentBitmap.Dispose();
currentBitmap = nextBitmap;
}
// After 10 zoom-ins, zoom out to starting fractal and start over.
double percentX = ((fractalArea.Left + (fractalArea.Width / 2D)) - this.initialFractalArea.Left) / this.initialFractalArea.Width;
double percentY = ((fractalArea.Top + (fractalArea.Height / 2D)) - this.initialFractalArea.Top) / this.initialFractalArea.Height;
var zoomPoint = new Point((int)(this.Width * percentX), (int)(this.Height * percentY));
IntPtr[] nativeZoomOutBitmapHandles = CreateNativeZoomOutBitmaps(currentBitmap, this.initialFractalBitmap, zoomPoint);
currentBitmap.Dispose();
// Wait a bit between zooms, even if all computations are complete.
this.stopwatch.Stop();
if (this.stopwatch.ElapsedMilliseconds < WaitMilliseconds)
{
Thread.Sleep(WaitMilliseconds - (int)this.stopwatch.ElapsedMilliseconds);
}
AnimateZoomOut(formGraphics, nativeZoomOutBitmapHandles, this.Size);
this.stopwatch.Restart();
// Clean up animation bitmaps after use.
foreach (IntPtr nativeZoomOutBitmapHandle in nativeZoomOutBitmapHandles)
{
NativeMethods.GDI32.DeleteObject(nativeZoomOutBitmapHandle);
}
}
});
}
private void ScreenSaverForm_Load(object sender, EventArgs e)
{
this.AssignColorScheme();
this.initialFractalArea = Mandelbrot.GetInitialArea(this.Size);
this.initialFractalBitmap = Mandelbrot.RenderInitialFractal(this.Size, this.initialFractalArea, BaseMaximumIterations, this.colorFunction);
}