private void EnqueueTask(long id /*Func<RenderTaskState, RenderResult> task*/)
{
if (runningTasks.Count < maxTasks)
{
Size screenSize = new Size(Math.Abs(LeftFromX(ActualPlotRect.XMax) - LeftFromX(ActualPlotRect.XMin)), Math.Abs(TopFromY(ActualPlotRect.YMax) - TopFromY(ActualPlotRect.YMin)));
RenderTaskState state = new RenderTaskState(ActualPlotRect, screenSize);
state.Id = id;
state.Bounds = ComputeBounds();
runningTasks.Add(state);
if (!DesignerProperties.GetIsInDesignMode(this))
{
ThreadPool.QueueUserWorkItem(s =>
{
var rr = RenderFrame((RenderTaskState)s);
Dispatcher.BeginInvoke(new RenderFunc(OnTaskCompleted), rr, s);
}, state);
}
else
{
var rr = RenderFrame(state);
OnTaskCompleted(rr, state);
}
}
else
{
tasks.Enqueue(id);
}
}
/// <summary>
/// Renders frame and returns it as a render result.
/// </summary>
/// <param name="state">Render task state for rendering frame.</param>
/// <returns>Render result of rendered frame.</returns>
protected virtual RenderResult RenderFrame(RenderTaskState state)
{
//if (!state.IsCancelled)
// return new RenderResult(HeatMap.BuildHeatMap(state.Transform.ScreenRect, new DataRect(state.Transform.ViewportRect), DataSource.X, DataSource.Y, DataSource.Data, 0));
//else
return(null);
}
private void OnTaskCompleted(RenderResult r, RenderTaskState state)
{
if (r != null && !state.IsCanceled)
{
WriteableBitmap wr = new WriteableBitmap((int)r.Output.Width, (int)r.Output.Height, 96, 96, PixelFormats.Bgra32, null);
// Calculate the number of bytes per pixel.
int bytesPerPixel = (wr.Format.BitsPerPixel + 7) / 8;
// Stride is bytes per pixel times the number of pixels.
// Stride is the byte width of a single rectangle row.
int stride = wr.PixelWidth * bytesPerPixel;
wr.WritePixels(new Int32Rect(0, 0, wr.PixelWidth, wr.PixelHeight), r.Image, stride, 0);
outputImage.Source = wr;
Canvas.SetLeft(outputImage, r.Output.Left);
Canvas.SetTop(outputImage, r.Output.Top);
imageCartesianRect = r.Visible;
imageSize = new Size(r.Output.Width, r.Output.Height);
outputImage.RenderTransform = null;
}
RaiseTaskCompletion(state.Id);
runningTasks.Remove(state);
while (tasks.Count > 1)
{
long id = tasks.Dequeue();
RaiseTaskCompletion(id);
}
if (tasks.Count > 0 && runningTasks.Count < maxTasks)
{
EnqueueTask(tasks.Dequeue());
}
InvalidateMeasure();
}
/// <summary>
/// Renders frame and returns it as a render result.
/// </summary>
/// <param name="state">Render task state for rendering frame.</param>
/// <returns>Render result of rendered frame.</returns>
protected override RenderResult RenderFrame(RenderTaskState state)
{
if (state == null)
{
throw new ArgumentNullException("state");
}
if (!state.Bounds.IsEmpty && !state.IsCanceled && data != null)
{
//DataRect dataRect = new DataRect(state.Transform.Visible);
//Rect output = state.Transform.Screen;
DataRect dataRect = state.ActualPlotRect;
DataRect output = new DataRect(0, 0, state.ScreenSize.Width, state.ScreenSize.Height);
DataRect bounds = state.Bounds;
if (dataRect.XMin >= bounds.XMax || dataRect.XMax <= bounds.XMin ||
dataRect.YMin >= bounds.YMax || dataRect.YMax <= bounds.YMin)
{
return(null);
}
double left = 0;
double xmin = dataRect.XMin;
double scale = output.Width / dataRect.Width;
if (xmin < bounds.XMin)
{
left = (bounds.XMin - dataRect.XMin) * scale;
xmin = bounds.XMin;
}
double width = output.Width - left;
double xmax = dataRect.XMax;
if (xmax > bounds.XMax)
{
width -= (dataRect.XMax - bounds.XMax) * scale;
xmax = bounds.XMax;
}
scale = output.Height / dataRect.Height;
double top = 0;
double ymax = dataRect.YMax;
if (ymax > bounds.YMax)
{
top = (dataRect.YMax - bounds.YMax) * scale;
ymax = bounds.YMax;
}
double height = output.Height - top;
double ymin = dataRect.YMin;
if (ymin < bounds.YMin)
{
height -= (bounds.YMin - dataRect.YMin) * scale;
ymin = bounds.YMin;
}
if (xmin < bounds.XMin)
{
xmin = bounds.XMin;
}
if (xmax > bounds.XMax)
{
xmax = bounds.XMax;
}
if (ymin < bounds.YMin)
{
ymin = bounds.YMin;
}
if (ymax > bounds.YMax)
{
ymax = bounds.YMax;
}
DataRect visibleData = new DataRect(xmin, ymin, xmax, ymax);
// Capture data to local variable
double[,] localData;
double[] localX, localY;
long localDataVersion;
IPalette localPalette;
double localMV;
Range localDataRange;
bool getMaxMin = false;
lock (locker)
{
localData = data;
localX = xArr;
localY = yArr;
localDataVersion = dataVersion;
localPalette = palette;
localMV = missingValue;
localDataRange = dataRange;
if (palette.IsNormalized && dataVersion != dataRangeVersion)
{
getMaxMin = true;
}
}
if (getMaxMin)
{
localDataRange = Double.IsNaN(missingValue) ?
HeatmapBuilder.GetMaxMin(data) :
HeatmapBuilder.GetMaxMin(data, missingValue);
lock (locker)
{
if (dataVersion == localDataVersion)
{
dataRangeVersion = dataVersion;
dataRange = localDataRange;
}
else
{
return(null); // New data was passed to Plot method so this render task is obsolete
}
}
}
if (paletteRangeUpdateRequired)
{
Dispatcher.BeginInvoke(new Action <long>(UpdatePaletteRange), localDataVersion);
}
return(new RenderResult(HeatmapBuilder.BuildHeatMap(new Rect(0, 0, width, height),
visibleData, localX, localY, localData, localMV, localPalette, localDataRange), visibleData, new Point(left, top), width, height));
}
else
{
return(null);
}
}
