i have a little problem. I want to export to an image my charts. I known that is possible with the code given by beto-rodriguez (here).
But i have a problem, i can't have what i could have by displaying it in the screen. See the image above. On the bottom right, i have the image saved in png. And in the left of the image, i have the chart with all the parameters displayed where i want.
Do you known if it's possible to have the same chart (in the left) in the saved image ? Actually, i use a thread to capture (copy/paste) the image automatically.
Do you known what are the parameters i must set on to have the correct image ?
Thanks in advance. Regards.
********************************* After edit
Sorry for my late repsonse. I try what you said but unfornately I can't made that i want. I will explain what i do: I have a class "MakeReport" who can call another class "GraphMaker" with:
MyGraph = new GraphMaker();
MyGraph = GiveAGraph(MyGraph);
And the class "MakeReport" will complete the chart with some values with the sub-program "GiveAGraph()":
GraphData.SeriesCollection.Add(new RowSeries
{
Title = Criteria,
Values = DataValues,
ScalesYAt = Index,
DataLabels = true
});
End of "GiveAGRaph()".
Now I have a chart ready to display, i want to use it to make an image and for test (and debug) i show it:
// Chart to Image
MyGraph.GiveMeAnImageFromChart(); <-- to make a picture with the chart
// Show the graph
MyGraph.Show(); <-- for debug and test, i display it.
With "MyGraph.GiveAnImageFromChart()", i don't have the same result than "MyGraph.Show()". The picture (save as png) is different to the displayed chart.
The sub-program "GiveAnImageFromChart" included in the "GraphMaker" class is :
public void GiveMeAnImageFromChart()
{
var viewbox = new Viewbox();
myChart.Background = Brushes.White;
myChart.DataContext = this;
// myChart il faut tout mettre en paramètres
viewbox.Child = myChart;
viewbox.Measure(myChart.RenderSize);
viewbox.Arrange(new Rect(new Point(0, 0), myChart.RenderSize));
myChart.Update(true, true); //force chart redraw
viewbox.UpdateLayout();
SaveToPng(myChart, "chart.png");
//png file was created at the root directory.
}
The "myChart" variable is public. The "SaveToPng" program used come from your example (here).
To save the picture, i try with the following method :
public System.Drawing.Bitmap ControlToImage(Visual target, double dpiX, double dpiY)
{
if (target == null)
{
return null;
}
// render control content
Rect bounds = VisualTreeHelper.GetDescendantBounds(target);
Console.WriteLine("Bounds width = " + bounds.Width + " et bounds height = " + bounds.Height);
RenderTargetBitmap rtb = new RenderTargetBitmap((int)(bounds.Width * dpiX / 96.0),
(int)(bounds.Height * dpiY / 96.0),
dpiX,
dpiY,
PixelFormats.Pbgra32);
DrawingVisual dv = new DrawingVisual();
using (DrawingContext ctx = dv.RenderOpen())
{
VisualBrush vb = new VisualBrush(target);
ctx.DrawRectangle(vb, null, new Rect(new System.Windows.Point(), bounds.Size));
}
rtb.Render(dv);
//convert image format
MemoryStream stream = new MemoryStream();
BitmapEncoder encoder = new BmpBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(rtb));
encoder.Save(stream);
return new System.Drawing.Bitmap(stream);
}
With :
Bitmap ImageChart = MyGraph.ControlToImage(MyGraph, MyGraph.Width, MyGraph.Height);
With this method, i have an error because the "bounds.Width" and "bounds.Height" are equal to -8. And finally, i don't have any chart to convert.
I think i give a wrong "visual Target" in the "ControlImage" and I miss something but i don't know what. If you need more information, ask me. Thanks in advance for your help.
PS: sorry for my english. Don't hesitate to correct me.
