SetGraphScale
(
Int32 bitmapWidthPx,
Int32 bitmapHeightPx,
Double screenDpi
)
{
Debug.Assert(screenDpi > 0);
Debug.Assert(bitmapWidthPx > 0);
Debug.Assert(bitmapHeightPx > 0);
AssertValid();
GraphDrawer oGraphDrawer = m_oNodeXLControl.GraphDrawer;
GroupDrawer oGroupDrawer = oGraphDrawer.GroupDrawer;
// Note that group labels have their own scale, distinct from the scale
// used by the other graph elements.
m_dOriginalGraphScale = oGraphDrawer.GraphScale;
m_dOriginalGroupLabelScale = oGroupDrawer.LabelScale;
// Get the actual control size, in units of 1/96".
Double dActualWidthWpf = m_oNodeXLControl.ActualWidth;
Double dActualHeightWpf = m_oNodeXLControl.ActualHeight;
// Convert this to pixels.
Double dActualWidthPx = WpfGraphicsUtil.WpfToPx(
dActualWidthWpf, screenDpi);
Double dActualHeightPx = WpfGraphicsUtil.WpfToPx(
dActualHeightWpf, screenDpi);
// If the image is smaller (or larger) than the control, adjust the
// GraphScale property to shrink (or enlarge) the graph's vertices and
// edges accordingly. Use the smaller of the two bitmap/actual ratio.
Double dGraphScaleFactor = Math.Min(
bitmapWidthPx / dActualWidthPx,
bitmapHeightPx / dActualHeightPx
);
Double dGraphScale =
PinScale(m_dOriginalGraphScale * dGraphScaleFactor);
Double dGroupLabelScale =
PinScale(m_dOriginalGroupLabelScale * dGraphScaleFactor);
// Don't set the NodeXLControl.GraphScale property, which would cause
// the NodeXLControl.GraphScaleChanged event to fire. Set the property
// on the GraphDrawer instead.
oGraphDrawer.GraphScale = dGraphScale;
oGroupDrawer.LabelScale = dGroupLabelScale;
AssertValid();
}
//*************************************************************************
// Constructor: GraphDrawer()
//
/// <summary>
/// Initializes a new instance of the <see cref="GraphDrawer" /> class.
/// </summary>
///
/// <param name="parentVisual">
/// The parent of the contained <see
/// cref="GraphDrawer.VisualCollection" />. This is usually a
/// FrameworkElement that is hosting the collection.
/// </param>
//*************************************************************************
public GraphDrawer
(
Visual parentVisual
)
{
Debug.Assert(parentVisual != null);
m_oVisualCollection = new VisualCollection(parentVisual);
m_oAllVertexDrawingVisuals = null;
m_oUnselectedEdgeDrawingVisuals = null;
m_oSelectedEdgeDrawingVisuals = null;
m_oVertexDrawer = new VertexDrawer();
m_oEdgeDrawer = new EdgeDrawer();
m_oGroupDrawer = new GroupDrawer();
m_oBackColor = SystemColors.WindowColor;
m_oBackgroundImage = null;
AssertValid();
}
//*************************************************************************
// Constructor: GraphDrawer()
//
/// <summary>
/// Initializes a new instance of the <see cref="GraphDrawer" /> class.
/// </summary>
///
/// <param name="parentVisual">
/// The parent of the contained <see
/// cref="GraphDrawer.VisualCollection" />. This is usually a
/// FrameworkElement that is hosting the collection.
/// </param>
//*************************************************************************
public GraphDrawer
(
Visual parentVisual
)
{
Debug.Assert(parentVisual != null);
m_oVisualCollection = new VisualCollection(parentVisual);
m_oAllVertexDrawingVisuals = null;
m_oUnselectedEdgeDrawingVisuals = null;
m_oSelectedEdgeDrawingVisuals = null;
m_oVertexDrawer = new VertexDrawer();
m_oEdgeDrawer = new EdgeDrawer();
m_oGroupDrawer = new GroupDrawer();
m_oBackColor = SystemColors.WindowColor;
m_oBackgroundImage = null;
AssertValid();
}
