public void Draw(Graphics g, Ink.Renderer renderer)
{
if (renderer == null)
{
throw new NullReferenceException("cannot draw with null renderer");
}
for (int i = 0; i < NUM_DRAW_ATTEMPTS; i++)
{
try {
renderer.Draw(g, myInk.Strokes);
break;
}
catch (Exception e) {
System.Diagnostics.Debug.WriteLine("Exception occurred in InkScribble.Draw: " + e);
// Ignore exception.
System.Threading.Thread.Sleep(100);
}
}
}
/// <summary>
/// Draw ink strokes on top of the given image. Using DibGraphicsBuffer preserves
/// ink transparency and anti-aliasing.
/// </summary>
/// <param name="img"></param>
/// <param name="pageIdentifier"></param>
private void AddInkOverlay(Image img, Guid pageIdentifier) {
ScaledInk scaledInk = (ScaledInk)hashtablePageStrokes[pageIdentifier.ToString()];
if ((scaledInk != null) && (scaledInk.PageInk.Strokes.Count > 0)) {
//Draw the slide data on a temporary graphics object in a temporary form
System.Windows.Forms.Form tempForm = new System.Windows.Forms.Form();
Graphics screenGraphics = tempForm.CreateGraphics();
DibGraphicsBuffer dib = new DibGraphicsBuffer();
Graphics tempGraphics = dib.RequestBuffer(screenGraphics, img.Width, img.Height);
//Draw the existing image
tempGraphics.DrawImage(img, 0, 0);
//Scale the ink relative to the image
Microsoft.Ink.Renderer renderer = new Microsoft.Ink.Renderer();
Matrix transformation = new Matrix();
renderer.GetViewTransform(ref transformation);
transformation.Scale(((float)img.Width / scaledInk.PageWidth),
((float)img.Height / scaledInk.PageHeight));
renderer.SetViewTransform(transformation);
//Draw the ink
renderer.Draw(tempGraphics, scaledInk.PageInk.Strokes);
//Paint the results back to the original image
Graphics toSave = Graphics.FromImage(img);
dib.PaintBuffer(toSave, 0, 0);
//Cleanup
toSave.Dispose();
tempGraphics.Dispose();
dib.Dispose();
screenGraphics.Dispose();
tempForm.Dispose();
}
}
