public void LoadAsync(IFractal fractal, Bounds bounds)
{
BackgroundWorker worker = new BackgroundWorker();
worker.DoWork += RunFractalLoad;
IsLoading = true;
worker.RunWorkerAsync(new AsyncLoadArgs { Bounds = bounds, Fractal = fractal, Renderer = renderer });
}
/// <summary>Precomputed values used during the rendering to speed up calculations.</summary>
private void PrecomputeValues(IFractal fractal, Bounds bounds)
{
xIncrement = bounds.Width / width;
yIncrement = bounds.Height / height;
minBoundsX = bounds.X.MinValue;
minBoundsY = bounds.Y.MinValue;
}
/// <summary>Processes a fractal, computing its values, returning a RenderedFractal.</summary>
public RenderedFractal Process(IFractal fractal, Bounds boundsToRender, Dimensions imageDimensions)
{
width = imageDimensions.Width;
height = imageDimensions.Height;
PrecomputeValues(fractal, boundsToRender);
var buffer = new float[width * height];
Parallel.For(0, height, y =>
{
Parallel.For(0, width, x =>
{
SetPoint(buffer, fractal, x, y);
});
});
return new RenderedFractal(buffer, fractal.MaxIterations, boundsToRender, fractal);
}
/// <summary>Action to call when the mouse releases on the correct canvas.</summary>
public void MouseUp(MouseEventArgs e, Canvas boundingBoxCanvas)
{
if (!isDrawing)
return;
isDrawing = false;
if (boundingBox == null)
return;
boundingBoxCanvas.Children.Remove(boundingBox);
var screenBounds = new Bounds(
new Bound(Canvas.GetLeft(boundingBox), Canvas.GetLeft(boundingBox) + boundingBox.Width),
new Bound(Canvas.GetTop(boundingBox), Canvas.GetTop(boundingBox) + boundingBox.Height));
if (BoxReleased != null)
BoxReleased(screenBounds);
boundingBox = null;
}
/// <summary>Transforms the Bounds of the screen in to Bounds on the surface of the fractal.</summary>
public Bounds GetFractalBounds(Bounds screenBounds)
{
var percentageBounds = new Bounds(
new Bound(
screenBounds.X.MinValue / ImageProvider.Dimensions.Width,
screenBounds.X.MaxValue / ImageProvider.Dimensions.Width),
new Bound(
screenBounds.Y.MinValue / ImageProvider.Dimensions.Height,
screenBounds.Y.MaxValue / ImageProvider.Dimensions.Height)
);
var newBounds = new Bounds(
new Bound(
InternalLastRenderedBounds.X.MinValue + (InternalLastRenderedBounds.Width * percentageBounds.X.MinValue),
InternalLastRenderedBounds.X.MinValue + (InternalLastRenderedBounds.Width * percentageBounds.X.MaxValue)),
new Bound(
InternalLastRenderedBounds.Y.MinValue + (InternalLastRenderedBounds.Height * percentageBounds.Y.MinValue),
InternalLastRenderedBounds.Y.MinValue + (InternalLastRenderedBounds.Height * percentageBounds.Y.MaxValue)));
return newBounds;
}
/// <summary>Creates a new RenderedFractal with the data of the fractal.</summary>
public RenderedFractal(float[] data, int maxIterations, Bounds bounds, IFractal fractal)
: this(data, maxIterations)
{
Bounds = bounds;
Fractal = fractal;
}
/// <summary>Renders the fractal with the specified bounds, optionally ignoring pushing the bounds on to the history stack.</summary>
private void RenderNew(Bounds bounds, bool ignoreHistory)
{
AsyncLoader.OnFinished += fractal => {
if(!ignoreHistory)
History.Push(fractal);
SetImageDispatch(fractal);
};
AsyncLoader.PostFinish += fractal => PostRender(fractal);
AsyncLoader.LoadAsync(SelectedFractal, bounds);
}
/// <summary>Renders the fractal with the specified bounds, pushing the render on to the history stack.</summary>
private void RenderNew(Bounds bounds)
{
RenderNew(bounds, false);
}
/// <summary>Loads a fractal to the specified bounds, converting from bounds obtained from screen units.</summary>
public void LoadFractalFromScreenBounds(Bounds screenBounds)
{
var fractalBounds = renderer.GetFractalBounds(screenBounds);
RenderNew(fractalBounds);
}
/// <summary>
/// Resizes the Bounds to match the aspect ratio of the iamge to be rendered.
/// Prevents distorted images.
/// </summary>
private Bounds GetResizedBounds(Bounds areaToRender)
{
var realImageRatio = ImageProvider.Dimensions.Width / ImageProvider.Dimensions.Height;
var desiredRatio = areaToRender.Width / areaToRender.Height;
Bounds newBounds;
if (realImageRatio < desiredRatio)
{
var additionalHeight = (ImageProvider.Dimensions.Height * areaToRender.Width) / ImageProvider.Dimensions.Width - areaToRender.Height;
var amount = additionalHeight / 2;
newBounds = new Bounds(areaToRender.X, new Bound(areaToRender.Y.MinValue - amount, areaToRender.Y.MaxValue + amount));
}
else
{
var additionalWidth = (ImageProvider.Dimensions.Width * areaToRender.Height) / ImageProvider.Dimensions.Height - areaToRender.Width;
var amount = additionalWidth / 2;
newBounds = new Bounds(new Bound(areaToRender.X.MinValue - amount, areaToRender.X.MaxValue + amount), areaToRender.Y);
}
return newBounds;
}
/// <summary>
/// Gets a RenderedFractal by rendering the fractal with the area to render.
///
/// The bounds will be scaled to match the ImageProvider dimensions.
/// </summary>
public RenderedFractal Render(IFractal fractal, Bounds areaToRender)
{
var bounds = GetResizedBounds(areaToRender);
var renderedFractal = fractalProcessor.Process(fractal, bounds, ImageProvider.Dimensions);
return Render(renderedFractal);
}