PngEncoder class courtesy of Joe Stegman and opmized by Nikola: http://blogs.msdn.com/nikola/archive/2009/03/04/silverlight-super-fast-dymanic-image-generation-code-revisited.aspx
コード例 #1
0
        /// <summary>
        /// Handles the RunWorkerCompleted event of the renderThread control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.ComponentModel.RunWorkerCompletedEventArgs"/> instance containing the event data.</param>
        private void renderThread_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Cancelled)
            {
                if (enqueueExport != null)                 //cancelled because new image was requested. Create new image
                {
                    GetSource(enqueueExport, enqueueOnComplete);
                    enqueueExport     = null;
                    enqueueOnComplete = null;
                }
                return;
            }
            enqueueExport     = null;
            enqueueOnComplete = null;
            if (e.Result == null)
            {
                return;
            }
            object[] result = (object[])e.Result;

            int             width      = (int)result[1];
            int             height     = (int)result[2];
            Envelope        extent     = (Envelope)result[3];
            OnImageComplete onComplete = (OnImageComplete)result[4];

#if SILVERLIGHT
            BitmapImage image = new BitmapImage();
            PngEncoder  ei    = (PngEncoder)result[0];
            image.SetSource(ei.GetImageStream());
#else
            List <Color> colors = new List <Color>();
            colors.Add(Colors.Violet);
            colors.Add(Colors.Yellow);
            BitmapPalette palette = new BitmapPalette(colors);
            System.Windows.Media.PixelFormat pf =
                System.Windows.Media.PixelFormats.Bgra32;
            int          stride = width * (pf.BitsPerPixel / 8);
            BitmapSource image  = BitmapSource.Create(width, height, 96, 96, pf, palette, (int[])result[0], stride);
#endif
            onComplete(image, new ImageResult(extent));
        }
コード例 #2
0
        /// <summary>
        /// Handles the DoWork event of the renderThread control. This is where we
        /// render the heatmap outside the UI thread.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.ComponentModel.DoWorkEventArgs"/> instance
        /// containing the event data.</param>
        private void renderThread_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = (BackgroundWorker)sender;

            object[] args   = (object[])e.Argument;
            Envelope extent = (Envelope)args[0];
            int      width  = (int)args[1];
            int      height = (int)args[2];
            int      size   = (int)args[3];
            List <ThreadSafeGradientStop> stops = (List <ThreadSafeGradientStop>)args[4];
            List <HeatPoint> points             = (List <HeatPoint>)args[5];
            OnImageComplete  onComplete         = (OnImageComplete)args[6];

            size = size * 2 + 1;
            ushort[] matrix = CreateDistanceMatrix(size);
            int[]    output = new int[width * height];
            foreach (HeatPoint p in points)
            {
                AddPoint(matrix, size, p.X, p.Y, output, width);
                if (worker.CancellationPending)
                {
                    e.Cancel = true;
                    e.Result = null;
                    return;
                }
            }
            matrix = null;
            int max = 0;

            foreach (int val in output)             //find max - used for scaling the intensity
            {
                if (max < val)
                {
                    max = val;
                }
            }

            //If we only have single points in the view, don't show them with too much intensity.
            if (max < 2)
            {
                max = 2;
            }
#if SILVERLIGHT
            PngEncoder ei = new PngEncoder(width, height);
#else
            int[] pixels = new int[height * width];
#endif
            for (int idx = 0; idx < height; idx++)                  // Height (y)
            {
#if SILVERLIGHT
                int rowstart = ei.GetRowStart(idx);
#endif
                for (int jdx = 0; jdx < width; jdx++)                     // Width (x)
                {
                    Color c = InterpolateColor(output[idx * width + jdx] / (float)max, stops);
#if SILVERLIGHT
                    ei.SetPixelAtRowStart(jdx, rowstart, c.R, c.G, c.B, c.A);
#else
                    int color = (c.A << 24) + (c.R << 16) + (c.G << 8) + c.B;
                    pixels[idx * width + jdx] = color;
#endif
                }
                if (worker.CancellationPending)
                {
                    e.Cancel = true;
                    e.Result = null;
                    output   = null;
#if SILVERLIGHT
                    ei = null;
#else
                    pixels = null;
#endif
                    return;
                }
                //Raise the progress event for each line rendered
                worker.ReportProgress((idx + 1) * 100 / height);
            }
            stops.Clear();
            output = null;

            // Get stream and set image source
#if SILVERLIGHT
            e.Result = new object[] { ei, width, height, extent, onComplete };
#else
            e.Result = new object[] { pixels, width, height, extent, onComplete };
#endif
        }
コード例 #3
0
		/// <summary>
		/// Handles the DoWork event of the renderThread control. This is where we
		/// render the heatmap outside the UI thread.
		/// </summary>
		/// <param name="sender">The source of the event.</param>
		/// <param name="e">The <see cref="System.ComponentModel.DoWorkEventArgs"/> instance 
		/// containing the event data.</param>
		private void renderThread_DoWork(object sender, DoWorkEventArgs e)
		{
			BackgroundWorker worker = (BackgroundWorker)sender;
			object[] args = (object[])e.Argument;
			Envelope extent = (Envelope)args[0];
			int width = (int)args[1];
			int height = (int)args[2];
			int size = (int)args[3];
			List<ThreadSafeGradientStop> stops = (List<ThreadSafeGradientStop>)args[4];
			List<HeatPoint> points = (List<HeatPoint>)args[5];
			OnImageComplete onComplete = (OnImageComplete)args[6];

			size = size * 2 + 1;
			ushort[] matrix = CreateDistanceMatrix(size);
			int[] output = new int[width * height];
			foreach (HeatPoint p in points)
			{
				AddPoint(matrix, size, p.X, p.Y, output, width);
				if (worker.CancellationPending)
				{
					e.Cancel = true;
					e.Result = null;
					return;
				}
			}
			matrix = null;
			int max = 0;
			foreach (int val in output) //find max - used for scaling the intensity
				if (max < val) max = val;

			//If we only have single points in the view, don't show them with too much intensity.
			if (max < 2) max = 2; 
#if SILVERLIGHT
			PngEncoder ei = new PngEncoder(width, height);
#else
			int[] pixels = new int[height*width];
#endif
			for (int idx = 0; idx < height; idx++)      // Height (y)
			{
#if SILVERLIGHT
				int rowstart = ei.GetRowStart(idx);
#endif
				for (int jdx = 0; jdx < width; jdx++)     // Width (x)
				{
					Color c = InterpolateColor(output[idx * width + jdx] / (float)max, stops);
#if SILVERLIGHT
					ei.SetPixelAtRowStart(jdx, rowstart, c.R, c.G, c.B, c.A);
#else
					int color = (c.A << 24) + (c.R << 16) + (c.G << 8) + c.B;
					pixels[idx * width + jdx] = color;
#endif			
				}
				if (worker.CancellationPending)
				{
					e.Cancel = true;
					e.Result = null;
					output = null;
#if SILVERLIGHT
					ei = null;
#else
					pixels = null;
#endif
					return;
				}
				//Raise the progress event for each line rendered
				worker.ReportProgress((idx + 1) * 100 / height);
			}
			stops.Clear();
			output = null;

			// Get stream and set image source
#if SILVERLIGHT
			e.Result = new object[] { ei, width, height, extent, onComplete };
#else
			e.Result = new object[] { pixels, width, height, extent, onComplete };
#endif
		}