I need to save a chart made in a WPF UserControl in a vector graphics file format.
What I have tried until now was to get a hold of the UIElement (the User Control) containing the chart, and save that as a .wmf file. I know that WPF renders the UserControls in a vector graphics format, so it seems that saving this file should be really straightforward. Anyway, it seems that I can get a hold of the user control, but can't see what is inside, I have tried to place it in a canvas but that doesn't seem to work. I tried to use a canvas because I already managed to save a .wmf file from the Child Shapes in a Canvas.
private void InterceptChart()
{
TChartCanvas.Children.Add(new VisualHost { Visual=chart1});
}
public class VisualHost : UIElement
{
public Visual Visual { get; set; }
protected override int VisualChildrenCount
{
get { return Visual != null ? 1 : 0; }
}
protected override Visual GetVisualChild(int index)
{
return Visual;
}
}
public void Export(string filePath, Canvas MyCanvas)
{
int w = Convert.ToInt32(this.MyCanvas.Width);
int h = Convert.ToInt32(this.MyCanvas.Height);
System.Drawing.RectangleF rect = new System.Drawing.RectangleF(0, 0, w, h);
Bitmap bmp = new Bitmap(16, 16);
Graphics gs = Graphics.FromImage(bmp);
Metafile mf = new Metafile(filePath, gs.GetHdc(), rect, MetafileFrameUnit.Pixel);
Graphics g = Graphics.FromImage(mf);
WPFPainter painter = new WPFPainter(g, MyCanvas);
painter.Draw(); //painter takes the child shapes from the canvas and draws them using System.Drawing.Graphics
g.Save();
g.Dispose();
mf.Dispose();
}
I really hope there is a way to do this, because using a bitmap format to save these charts would make them useless, and I can't afford to re-write all the classes related to the graphics, but maybe I'm approaching this in the wrong way, if so I would appreciate if you could point me in the right direction. Cheers!
