Silverlight sample

[Anonymous]

Hi
I tried to use the library in a C# project. I could create a sample that would paint a background, but could not go any further. tried to paint some rectangle but nothing was displayed.

Used such a code

    private readonly WriteableBitmap _bmp;
    private readonly SLBackBuffer _backBuffer;
    double m_x = new double;
    double m_y = new double;

    public MainPage()
    {
      InitializeComponent();

      m_x = 100; m_y = 100;
      m_x = 500; m_y = 350;

      _bmp = new WriteableBitmap(800, 800);
      imageCanvas.Source = _bmp;

      _backBuffer = new SLBackBuffer(_bmp);     

      GammaLookUpTable gamma = new GammaLookUpTable(1.8);
      IBlender NormalBlender = new BlenderBGRA();
      IBlender GammaBlender = new BlenderGammaBGRA(gamma);
      RendererBase g = _backBuffer.BackBufferImage.NewRenderer();
      g.PushTransform();
      g.Clear(new RGBA_Doubles(0, 0, 1));
      ImageBuffer rasterNormal = new ImageBuffer(g.DestImage, NormalBlender);
      //ImageBuffer rasterGamma = new ImageBuffer(g.DestImage, GammaBlender);
      ImageClippingProxy clippingProxyNormal = new ImageClippingProxy(rasterNormal);
      //ImageClippingProxy clippingProxyGamma = new ImageClippingProxy(rasterGamma);

      clippingProxyNormal.clear(new RGBA_Doubles(1, 0, 1));

      IRasterizer ras = new rasterizer_scanline_aa();
      IScanlineCache sl = new scanline_packed_8();

      Ellipse e = new Ellipse();

      // Render two "control" circles
      e.init(m_x, m_y, 3, 3, 16);
      ras.add_path(e);
      Renderer.RenderSolid(clippingProxyNormal, ras, sl, new RGBA_Bytes(0, 1, 0, 1));
      e.init(m_x, m_y, 3, 3, 16);
      ras.add_path(e);
      Renderer.RenderSolid(clippingProxyNormal, ras, sl, new RGBA_Bytes(0, 0, 1, 1));

      // Creating a rounded rectangle
      RoundedRect r = new RoundedRect(m_x, m_y, m_x, m_y, 10);
      r.normalize_radius();

      // Drawing as an outline
      conv_stroke p = new conv_stroke(r);
      p.width(10.0);
      ras.add_path(p);

      //Renderer.RenderSolid(clippingProxyGamma, ras, sl, new RGBA_Bytes(0, 0, 0));
      Renderer.RenderSolid(clippingProxyNormal, ras, sl, new RGBA_Bytes(1, 0, 0, 1));

      _backBuffer.Invalidate();
    }

the backbuffer class looks like this

  public class SLBackBuffer
  {
    public ImageBuffer BackBufferImage { get; private set; }
    private readonly WriteableBitmap _writeableBitmap;

    public SLBackBuffer(WriteableBitmap writeableBitmap)
    {
      _writeableBitmap = writeableBitmap;
      Initialize(writeableBitmap.PixelWidth, writeableBitmap.PixelHeight, 32);
    }

    public SLBackBuffer(WriteableBitmap writeableBitmap, int width, int height)
    {
      _writeableBitmap = writeableBitmap;
      Initialize(width, height, 32);
    }

    public void Invalidate()
    {
      UpdateHardwareSurface();
    }

    internal void UpdateHardwareSurface()
    {
      if (BackBufferImage != null)
      {
        switch (BackBufferImage.BitDepth)
        {
          case 32:
            int offset;
            byte buffer = BackBufferImage.GetBuffer(out offset);
            int index = 0;
            int backBufferHeight = BackBufferImage.Height();
            int backBufferStrideInBytes = BackBufferImage.StrideInBytes();
            int backBufferStrideInInts = backBufferStrideInBytes / 4;
            int destBuffer = _writeableBitmap.Pixels;
            for (int y = 0; y < backBufferHeight; y++)
            {
              int yOffset = y*backBufferHeight;
              for (int x = 0; x < backBufferStrideInInts; x++)
              {
                byte b = buffer;
                byte g = buffer;
                byte r = buffer;
                byte a = buffer;
                destBuffer = (a << 24) | (r << 16) | (g << 8) | (b << 0);
                index += 4;
              }
            }
            break;
        }

        _writeableBitmap.Invalidate();
      }
    }

    internal void Initialize(int width, int height, int bitDepth)
    {
      if (width > 0 && height > 0)
      {
        switch (bitDepth)
        {
          case 32:
            BackBufferImage = new ImageBuffer(width, height, 32, new BlenderPreMultBGRA());
            break;
          default:
            throw new NotImplementedException("Don't support this bit depth yet.");
        }
      }
    }

  }

Any idea what could be wrong?
here are the complete files for the sample
http://designleon.zapto.org:6869/x_d/rsdn/AggSharpSample.zip

Thx for any feedback.

[Lars Brubaker]

I'm sorry to not have responded sooner.  We have consolidated all our code onto bitbucket. You can find the code at: https://bitbucket.org/MatterHackers/agg-sharp.  If you are still having troubles could you ask there?

Thanks, Lars.