//*************************************************************************
// Method: CopyGraphToBitmap()
//
/// <summary>
/// Creates a bitmap image of the graph.
/// </summary>
///
/// <param name="bitmapWidthPx">
/// Width of the bitmap image, in pixels. Must be greater than 0.
/// </param>
///
/// <param name="bitmapHeightPx">
/// Height of the bitmap image, in pixels. Must be greater than 0.
/// </param>
///
/// <returns>
/// A bitmap image of the graph displayed within the control, with the
/// specified dimensions.
/// </returns>
///
/// <remarks>
/// An exception is thrown if the graph is being laid out when this method
/// is called. Check the <see cref="IsLayingOutGraph" /> property before
/// calling this.
/// </remarks>
//*************************************************************************
public System.Drawing.Bitmap CopyGraphToBitmap(
Int32 bitmapWidthPx,
Int32 bitmapHeightPx
)
{
AssertValid();
const String MethodName = "CopyGraphToBitmap";
this.ArgumentChecker.CheckArgumentPositive(MethodName, "bitmapWidthPx",
bitmapWidthPx);
this.ArgumentChecker.CheckArgumentPositive(MethodName, "bitmapHeightPx",
bitmapHeightPx);
CheckIfLayingOutGraph(MethodName);
// Save the current vertex locations.
LayoutSaver oLayoutSaver = new LayoutSaver(this.Graph);
// Adjust the control's transforms so that the image will be centered
// on the same point on the graph that the control is centered on.
GraphImageCenterer oGraphImageCenterer = new GraphImageCenterer(this);
oGraphImageCenterer.CenterGraphImage(
new Size(bitmapWidthPx, bitmapHeightPx) );
// Transform the graph's layout to the specified size.
Double dOriginalActualWidth = this.ActualWidth;
Double dOriginalActualHeight = this.ActualHeight;
Rect oBitmapRectangle = new Rect(0, 0,
(Double)bitmapWidthPx, (Double)bitmapHeightPx);
TransformLayout(oBitmapRectangle);
Debug.Assert(m_eLayoutState == LayoutState.Stable);
DrawGraph(oBitmapRectangle);
System.Drawing.Bitmap oBitmap = WpfGraphicsUtil.VisualToBitmap(this,
bitmapWidthPx, bitmapHeightPx);
// Restore the original layout.
//
// NOTE:
//
// Don't try calling TransformLayout() again using the original
// rectangle. The first call to TransformLayout() lost "resolution" if
// the layout was transformed to a smaller rectangle, and attempting to
// reverse the transform will yield poor results.
oLayoutSaver.RestoreLayout();
oBitmapRectangle =
new Rect(0, 0, dOriginalActualWidth, dOriginalActualHeight);
Debug.Assert(m_eLayoutState == LayoutState.Stable);
DrawGraph(oBitmapRectangle);
oGraphImageCenterer.RestoreCenter();
return (oBitmap);
}
//*************************************************************************
// Method: SaveToXps()
//
/// <summary>
/// Saves the graph to the specified XPS file.
/// </summary>
///
/// <param name="imageSize">
/// Size of the XPS image, in WPS units.
/// </param>
///
/// <param name="fileName">
/// File name to save to.
/// </param>
///
/// <remarks>
/// This could conceivably be put in the base-class NodeXLControl class,
/// but that would force all users of the control to add references to the
/// XPS assemblies.
/// </remarks>
//*************************************************************************
public void SaveToXps(
Size imageSize,
String fileName
)
{
Debug.Assert( !String.IsNullOrEmpty(fileName) );
AssertValid();
CheckIfLayingOutGraph("SaveToXps");
// This control will be rehosted by a FixedPage. It can't be a child
// of logical trees, so disconnect it from its parent after saving the
// current vertex locations.
LayoutSaver oLayoutSaver = new LayoutSaver(this.Graph);
Debug.Assert(this.Parent is Panel);
Panel oParentPanel = (Panel)this.Parent;
UIElementCollection oParentChildren = oParentPanel.Children;
Int32 iChildIndex = oParentChildren.IndexOf(this);
oParentChildren.Remove(this);
GraphImageCenterer oGraphImageCenterer = new GraphImageCenterer(this);
FixedDocument oFixedDocument = new FixedDocument();
oFixedDocument.DocumentPaginator.PageSize = imageSize;
PageContent oPageContent = new PageContent();
FixedPage oFixedPage = new FixedPage();
oFixedPage.Width = imageSize.Width;
oFixedPage.Height = imageSize.Height;
this.Width = imageSize.Width;
this.Height = imageSize.Height;
// Adjust the control's translate transforms so that the image will be
// centered on the same point on the graph that the control is centered
// on.
oGraphImageCenterer.CenterGraphImage(imageSize);
oFixedPage.Children.Add(this);
oFixedPage.Measure(imageSize);
oFixedPage.Arrange(new System.Windows.Rect(
new System.Windows.Point(), imageSize) );
oFixedPage.UpdateLayout();
( (System.Windows.Markup.IAddChild)oPageContent ).AddChild(
oFixedPage);
oFixedDocument.Pages.Add(oPageContent);
try
{
XpsDocument oXpsDocument = new XpsDocument(fileName,
FileAccess.Write);
XpsDocumentWriter oXpsDocumentWriter =
XpsDocument.CreateXpsDocumentWriter(oXpsDocument);
oXpsDocumentWriter.Write(oFixedDocument);
oXpsDocument.Close();
}
finally
{
// Reconnect the NodeXLControl to its original parent. Reset the
// size to Auto in the process.
oFixedPage.Children.Remove(this);
this.Width = Double.NaN;
this.Height = Double.NaN;
oGraphImageCenterer.RestoreCenter();
oParentChildren.Insert(iChildIndex, this);
// The graph may have shrunk when it was connected to the
// FixedPage, and even though it will be expanded to its original
// dimensions when UpdateLayout() is called below, the layout may
// have lost "resolution" and the results may be poor.
//
// Fix this by restoring the original layout and redrawing the
// graph.
this.UpdateLayout();
oLayoutSaver.RestoreLayout();
this.DrawGraph(false);
}
}
SaveToXps
(
Size imageSize,
String fileName
)
{
Debug.Assert(!String.IsNullOrEmpty(fileName));
AssertValid();
CheckIfLayingOutGraph("SaveToXps");
// This control will be rehosted by a FixedPage. It can't be a child
// of logical trees, so disconnect it from its parent after saving the
// current vertex locations.
LayoutSaver oLayoutSaver = new LayoutSaver(this.Graph);
Debug.Assert(this.Parent is Panel);
Panel oParentPanel = (Panel)this.Parent;
UIElementCollection oParentChildren = oParentPanel.Children;
Int32 iChildIndex = oParentChildren.IndexOf(this);
oParentChildren.Remove(this);
GraphImageCenterer oGraphImageCenterer = new GraphImageCenterer(this);
FixedDocument oFixedDocument = new FixedDocument();
oFixedDocument.DocumentPaginator.PageSize = imageSize;
PageContent oPageContent = new PageContent();
FixedPage oFixedPage = new FixedPage();
oFixedPage.Width = imageSize.Width;
oFixedPage.Height = imageSize.Height;
this.Width = imageSize.Width;
this.Height = imageSize.Height;
// Adjust the control's translate transforms so that the image will be
// centered on the same point on the graph that the control is centered
// on.
oGraphImageCenterer.CenterGraphImage(imageSize);
oFixedPage.Children.Add(this);
oFixedPage.Measure(imageSize);
oFixedPage.Arrange(new System.Windows.Rect(
new System.Windows.Point(), imageSize));
oFixedPage.UpdateLayout();
((System.Windows.Markup.IAddChild)oPageContent).AddChild(
oFixedPage);
oFixedDocument.Pages.Add(oPageContent);
try
{
XpsDocument oXpsDocument = new XpsDocument(fileName,
FileAccess.Write);
XpsDocumentWriter oXpsDocumentWriter =
XpsDocument.CreateXpsDocumentWriter(oXpsDocument);
oXpsDocumentWriter.Write(oFixedDocument);
oXpsDocument.Close();
}
finally
{
// Reconnect the NodeXLControl to its original parent. Reset the
// size to Auto in the process.
oFixedPage.Children.Remove(this);
this.Width = Double.NaN;
this.Height = Double.NaN;
oGraphImageCenterer.RestoreCenter();
oParentChildren.Insert(iChildIndex, this);
// The graph may have shrunk when it was connected to the
// FixedPage, and even though it will be expanded to its original
// dimensions when UpdateLayout() is called below, the layout may
// have lost "resolution" and the results may be poor.
//
// Fix this by restoring the original layout and redrawing the
// graph.
this.UpdateLayout();
oLayoutSaver.RestoreLayout();
this.DrawGraph(false);
}
}
