PostDrawVertex
(
VertexShape vertexShape,
Color vertexColor,
GraphDrawingContext graphDrawingContext,
DrawingContext drawingContext,
Boolean drawAsSelected,
Double graphScale,
VertexLabelDrawer vertexLabelDrawer,
FormattedTextManager formattedTextManager,
VertexDrawingHistory vertexDrawingHistory
)
{
Debug.Assert(graphDrawingContext != null);
Debug.Assert(drawingContext != null);
Debug.Assert(graphScale >= GraphDrawer.MinimumGraphScale);
Debug.Assert(graphScale <= GraphDrawer.MaximumGraphScale);
Debug.Assert(vertexLabelDrawer != null);
Debug.Assert(formattedTextManager != null);
Debug.Assert(vertexDrawingHistory != null);
AssertValid();
if (m_oCollapsedGroupVertex == null)
{
// The vertex that was drawn is not a collapsed group vertex. Do
// nothing.
return;
}
if (m_oCollapsedGroupAttributes.Count == 0)
{
// The vertex that was drawn represents a collapsed group, but no
// attributes were specified for it. By default, such a vertex
// gets a plus sign drawn on top of it.
DrawPlusSign(vertexShape, vertexColor, graphDrawingContext,
drawingContext, graphScale, vertexLabelDrawer,
formattedTextManager, vertexDrawingHistory);
}
else
{
// Check whether this this is a collapsed motif.
switch ( m_oCollapsedGroupAttributes.GetGroupType() )
{
case CollapsedGroupAttributeValues.FanMotifType:
DrawFanMotifFan(vertexColor, drawingContext,
drawAsSelected, graphScale, vertexDrawingHistory);
break;
default:
// Do nothing. This includes the D-connector motif case,
// which requires no post-drawing action.
break;
}
}
}
DrawPlusSign
(
VertexShape eVertexShape,
Color oVertexColor,
GraphDrawingContext oGraphDrawingContext,
DrawingContext oDrawingContext,
Double dGraphScale,
VertexLabelDrawer oVertexLabelDrawer,
FormattedTextManager oFormattedTextManager,
VertexDrawingHistory oVertexDrawingHistory
)
{
Debug.Assert(oGraphDrawingContext != null);
Debug.Assert(oDrawingContext != null);
Debug.Assert(dGraphScale >= GraphDrawer.MinimumGraphScale);
Debug.Assert(dGraphScale <= GraphDrawer.MaximumGraphScale);
Debug.Assert(oVertexLabelDrawer != null);
Debug.Assert(oFormattedTextManager != null);
Debug.Assert(oVertexDrawingHistory != null);
AssertValid();
Color oFillColor;
switch (eVertexShape)
{
case VertexShape.Circle:
case VertexShape.Square:
case VertexShape.Diamond:
case VertexShape.Triangle:
// The fill color is the color of the background. Adjust the
// fill color for the opacity of the vertex.
oFillColor = WpfGraphicsUtil.SetWpfColorAlpha(
oGraphDrawingContext.BackColor, oVertexColor.A);
break;
default:
oFillColor = oVertexColor;
break;
}
Color oContrastingColor =
WpfGraphicsUtil.GetContrastingColor(oFillColor);
// The font size used below was chosen so that it is large enough to be
// easily readable, but small enough to fit within the smallest
// collapsed group vertex created by this class.
oVertexLabelDrawer.DrawLabel(oDrawingContext, oGraphDrawingContext,
oVertexDrawingHistory, VertexLabelPosition.MiddleCenter,
oFormattedTextManager.CreateFormattedText("+", oContrastingColor,
15.0, dGraphScale),
oContrastingColor, false);
}
TryDrawVertex
(
IVertex vertex,
GraphDrawingContext graphDrawingContext,
out VertexDrawingHistory vertexDrawingHistory
)
{
AssertValid();
vertexDrawingHistory = null;
CheckDrawVertexArguments(vertex, graphDrawingContext);
if (graphDrawingContext.GraphRectangleMinusMarginIsEmpty)
{
return (false);
}
// If the vertex is hidden, do nothing.
VisibilityKeyValue eVisibility = GetVisibility(vertex);
if (eVisibility == VisibilityKeyValue.Hidden)
{
return (false);
}
// Check whether the vertex represents a collapsed group and perform
// collapsed group tasks if necessary.
CollapsedGroupDrawingManager oCollapsedGroupDrawingManager =
new CollapsedGroupDrawingManager();
oCollapsedGroupDrawingManager.PreDrawVertex(vertex);
// Check for a per-vertex label.
Object oLabelAsObject;
String sLabel = null;
if ( vertex.TryGetValue(ReservedMetadataKeys.PerVertexLabel,
typeof(String), out oLabelAsObject) )
{
sLabel = (String)oLabelAsObject;
if ( String.IsNullOrEmpty(sLabel) )
{
sLabel = null;
}
else
{
sLabel = TruncateLabel(sLabel);
}
}
Boolean bDrawAsSelected = GetDrawAsSelected(vertex);
Point oLocation = WpfGraphicsUtil.PointFToWpfPoint(vertex.Location);
DrawingVisualPlus oDrawingVisual = new DrawingVisualPlus();
VertexShape eShape = GetShape(vertex);
VertexLabelDrawer oVertexLabelDrawer =
new VertexLabelDrawer(m_eLabelPosition, m_btBackgroundAlpha);
using ( DrawingContext oDrawingContext = oDrawingVisual.RenderOpen() )
{
if (eShape == VertexShape.Label)
{
if (sLabel != null)
{
// Draw the vertex as a label.
vertexDrawingHistory = DrawLabelShape(vertex,
graphDrawingContext, oDrawingContext, oDrawingVisual,
eVisibility, bDrawAsSelected, sLabel,
oCollapsedGroupDrawingManager);
}
else
{
// Default to something usable.
eShape = VertexShape.Disk;
}
}
else if (eShape == VertexShape.Image)
{
Object oImageSourceAsObject;
if (vertex.TryGetValue(ReservedMetadataKeys.PerVertexImage,
typeof(ImageSource), out oImageSourceAsObject)
)
{
// Draw the vertex as an image.
vertexDrawingHistory = DrawImageShape(vertex,
graphDrawingContext, oDrawingContext, oDrawingVisual,
eVisibility, bDrawAsSelected, sLabel,
(ImageSource)oImageSourceAsObject, oVertexLabelDrawer,
oCollapsedGroupDrawingManager);
}
else
{
// Default to something usable.
eShape = VertexShape.Disk;
}
}
if (vertexDrawingHistory == null)
{
// Draw the vertex as a simple shape.
vertexDrawingHistory = DrawSimpleShape(vertex, eShape,
graphDrawingContext, oDrawingContext, oDrawingVisual,
eVisibility, bDrawAsSelected, sLabel, oVertexLabelDrawer,
oCollapsedGroupDrawingManager);
}
// Perform collapsed group tasks if necessary.
oCollapsedGroupDrawingManager.PostDrawVertex(eShape,
GetColor(vertex, eVisibility, bDrawAsSelected),
graphDrawingContext, oDrawingContext, bDrawAsSelected,
m_dGraphScale, oVertexLabelDrawer, m_oFormattedTextManager,
vertexDrawingHistory);
}
return (true);
}
DrawSimpleShape
(
IVertex oVertex,
VertexShape eShape,
GraphDrawingContext oGraphDrawingContext,
DrawingContext oDrawingContext,
DrawingVisualPlus oDrawingVisual,
VisibilityKeyValue eVisibility,
Boolean bDrawAsSelected,
String sAnnotation,
VertexLabelDrawer oVertexLabelDrawer,
CollapsedGroupDrawingManager oCollapsedGroupDrawingManager
)
{
Debug.Assert(oVertex != null);
Debug.Assert(oGraphDrawingContext != null);
Debug.Assert(oDrawingContext != null);
Debug.Assert(oDrawingVisual != null);
Debug.Assert(oVertexLabelDrawer != null);
Debug.Assert(oCollapsedGroupDrawingManager != null);
AssertValid();
Double dRadius = GetRadius(oVertex);
Color oColor = GetColor(oVertex, eVisibility, bDrawAsSelected);
Point oVertexLocation = GetVertexLocation(oVertex);
oDrawingVisual.SetEffect( GetSimpleShapeEffect(
oGraphDrawingContext, dRadius, oColor) );
Rect oVertexBounds;
if (eShape == VertexShape.Triangle ||
eShape == VertexShape.SolidTriangle)
{
oVertexBounds =
WpfGraphicsUtil.TriangleBoundsFromCenterAndHalfWidth(
oVertexLocation, dRadius);
}
else if (eShape == VertexShape.SolidTaperedDiamond)
{
// Note that the bounds of a tapered diamond can't be calculated
// using simple equations. Instead, create the tapered diamond and
// let WPF compute the bounds.
//
// There is some inefficiency here, because the tapered diamond
// gets created again before it is drawn, in its possibly-moved
// location.
oVertexBounds = WpfPathGeometryUtil.GetTaperedDiamond(
oVertexLocation, dRadius).Bounds;
}
else if (eShape == VertexShape.SolidRoundedX)
{
// Note that the bounds of a rounded X can't be calculated
// using simple equations. Instead, create the rounded X and
// let WPF compute the bounds.
//
// There is some inefficiency here, because the rounded X
// gets created again before it is drawn, in its possibly-moved
// location.
oVertexBounds = WpfPathGeometryUtil.GetRoundedX(
oVertexLocation, dRadius).Bounds;
}
else
{
oVertexBounds = WpfGraphicsUtil.SquareFromCenterAndHalfWidth(
oVertexLocation, dRadius);
}
// Move the vertex if it falls outside the graph rectangle.
MoveVertexIfNecessary(oVertex, oGraphDrawingContext,
oCollapsedGroupDrawingManager, ref oVertexBounds);
oVertexLocation = GetVertexLocation(oVertex);
VertexDrawingHistory oVertexDrawingHistory = null;
// Note that for the "hollow" shapes -- Circle, Square, Diamond, and
// Triangle -- Brushes.Transparent is used instead of a null brush.
// This allows the entire area of these shapes to be hit-tested. Using
// a null brush would cause hit-testing to fail if the shapes'
// interiors were clicked.
switch (eShape)
{
case VertexShape.Circle:
case VertexShape.Disk:
Boolean bIsDisk = (eShape == VertexShape.Disk);
oDrawingContext.DrawEllipse(
bIsDisk ? GetBrush(oColor) : Brushes.Transparent,
bIsDisk ? null : GetPen(oColor, DefaultPenThickness),
oVertexLocation, dRadius, dRadius
);
oVertexDrawingHistory = bIsDisk ?
new DiskVertexDrawingHistory(
oVertex, oDrawingVisual, bDrawAsSelected, dRadius)
:
new CircleVertexDrawingHistory(
oVertex, oDrawingVisual, bDrawAsSelected, dRadius);
break;
case VertexShape.Sphere:
RadialGradientBrush oRadialGradientBrush =
new RadialGradientBrush();
oRadialGradientBrush.GradientOrigin =
oRadialGradientBrush.Center = new Point(0.3, 0.3);
GradientStopCollection oGradientStops =
oRadialGradientBrush.GradientStops;
oGradientStops.Add( new GradientStop(
WpfGraphicsUtil.SetWpfColorAlpha(Colors.White, oColor.A),
0.0) );
oGradientStops.Add( new GradientStop(oColor, 1.0) );
WpfGraphicsUtil.FreezeIfFreezable(oRadialGradientBrush);
oDrawingContext.DrawEllipse(oRadialGradientBrush, null,
oVertexLocation, dRadius, dRadius);
oVertexDrawingHistory = new SphereVertexDrawingHistory(
oVertex, oDrawingVisual, bDrawAsSelected, dRadius);
break;
case VertexShape.Square:
WpfGraphicsUtil.DrawPixelAlignedRectangle(oDrawingContext,
Brushes.Transparent, GetPen(oColor, DefaultPenThickness),
oVertexBounds);
oVertexDrawingHistory = new SquareVertexDrawingHistory(oVertex,
oDrawingVisual, bDrawAsSelected, oVertexBounds);
break;
case VertexShape.SolidSquare:
oDrawingContext.DrawRectangle(GetBrush(oColor), null,
oVertexBounds);
oVertexDrawingHistory = new SolidSquareVertexDrawingHistory(
oVertex, oDrawingVisual, bDrawAsSelected, oVertexBounds);
break;
case VertexShape.Diamond:
case VertexShape.SolidDiamond:
Boolean bIsSolidDiamond = (eShape == VertexShape.SolidDiamond);
PathGeometry oDiamond =
WpfPathGeometryUtil.GetDiamond(oVertexLocation, dRadius);
oDrawingContext.DrawGeometry(
bIsSolidDiamond ? GetBrush(oColor) : Brushes.Transparent,
bIsSolidDiamond ? null :
GetPen(oColor, DefaultPenThickness),
oDiamond
);
oVertexDrawingHistory = bIsSolidDiamond ?
new SolidDiamondVertexDrawingHistory(
oVertex, oDrawingVisual, bDrawAsSelected, dRadius)
:
new DiamondVertexDrawingHistory(
oVertex, oDrawingVisual, bDrawAsSelected, dRadius);
break;
case VertexShape.Triangle:
case VertexShape.SolidTriangle:
Boolean bIsSolidTriangle =
(eShape == VertexShape.SolidTriangle);
PathGeometry oTriangle =
WpfPathGeometryUtil.GetTriangle(oVertexLocation, dRadius);
oDrawingContext.DrawGeometry(
bIsSolidTriangle ? GetBrush(oColor) : Brushes.Transparent,
bIsSolidTriangle ? null :
GetPen(oColor, DefaultPenThickness),
oTriangle
);
oVertexDrawingHistory = bIsSolidTriangle ?
new SolidTriangleVertexDrawingHistory(
oVertex, oDrawingVisual, bDrawAsSelected, dRadius)
:
new TriangleVertexDrawingHistory(
oVertex, oDrawingVisual, bDrawAsSelected, dRadius);
break;
case VertexShape.SolidTaperedDiamond:
Geometry oTaperedDiamond =
WpfPathGeometryUtil.GetTaperedDiamond(
oVertexLocation, dRadius);
// Note that as of August 2012, the tapered diamond shape is
// used only for collapsed connector motifs. Collapsed motifs
// have an outline, so draw an outline here.
oDrawingContext.DrawGeometry(GetBrush(oColor),
GetPen( CollapsedGroupDrawingManager
.GetCollapsedMotifOutlineColor(oColor.A),
DefaultPenThickness),
oTaperedDiamond);
oVertexDrawingHistory =
new SolidTaperedDiamondVertexDrawingHistory(
oVertex, oDrawingVisual, bDrawAsSelected, dRadius);
break;
case VertexShape.SolidRoundedX:
Geometry oRoundedX =
WpfPathGeometryUtil.GetRoundedX(
oVertexLocation, dRadius);
// Note that as of August 2012, the rounded X shape is
// used only for collapsed clique motifs. Collapsed motifs
// have an outline, so draw an outline here.
oDrawingContext.DrawGeometry(GetBrush(oColor),
GetPen(CollapsedGroupDrawingManager
.GetCollapsedMotifOutlineColor(oColor.A),
DefaultPenThickness),
oRoundedX);
oVertexDrawingHistory =
new SolidRoundedXVertexDrawingHistory(
oVertex, oDrawingVisual, bDrawAsSelected, dRadius);
break;
default:
Debug.Assert(false);
break;
}
if (sAnnotation != null)
{
oVertexLabelDrawer.DrawLabel(oDrawingContext,
oGraphDrawingContext, oVertexDrawingHistory,
CreateFormattedTextWithWrap(sAnnotation, oColor,
m_oFormattedTextManager.FontSize),
oColor);
}
Debug.Assert(oVertexDrawingHistory != null);
return (oVertexDrawingHistory);
}
DrawImageShape
(
IVertex oVertex,
GraphDrawingContext oGraphDrawingContext,
DrawingContext oDrawingContext,
DrawingVisualPlus oDrawingVisual,
VisibilityKeyValue eVisibility,
Boolean bDrawAsSelected,
String sAnnotation,
ImageSource oImageSource,
VertexLabelDrawer oVertexLabelDrawer,
CollapsedGroupDrawingManager oCollapsedGroupDrawingManager
)
{
Debug.Assert(oVertex != null);
Debug.Assert(oGraphDrawingContext != null);
Debug.Assert(oDrawingContext != null);
Debug.Assert(oDrawingVisual != null);
Debug.Assert(oImageSource != null);
Debug.Assert(oVertexLabelDrawer != null);
Debug.Assert(oCollapsedGroupDrawingManager != null);
AssertValid();
// Move the vertex if it falls outside the graph rectangle.
Rect oVertexRectangle = GetVertexRectangle(
GetVertexLocation(oVertex), oImageSource.Width * m_dGraphScale,
oImageSource.Height * m_dGraphScale);
MoveVertexIfNecessary(oVertex, oGraphDrawingContext,
oCollapsedGroupDrawingManager, ref oVertexRectangle);
Byte btAlpha = 255;
if (!bDrawAsSelected)
{
// Check for a non-opaque alpha value.
btAlpha = GetAlpha(oVertex, eVisibility, btAlpha);
}
VertexDrawingHistory oVertexDrawingHistory =
new ImageVertexDrawingHistory(oVertex, oDrawingVisual,
bDrawAsSelected, oVertexRectangle);
if (btAlpha > 0)
{
oDrawingContext.DrawImage(oImageSource, oVertexRectangle);
Color oColor = GetColor(oVertex, eVisibility, bDrawAsSelected);
oDrawingVisual.SetEffect( GetRectangleEffect(
oGraphDrawingContext, oColor) );
// Draw an outline rectangle.
WpfGraphicsUtil.DrawPixelAlignedRectangle(oDrawingContext, null,
GetPen(oColor, DefaultPenThickness), oVertexRectangle);
if (btAlpha < 255)
{
// Real transparency can't be achieved with arbitrary images,
// so simulate transparency by drawing on top of the image with
// a translucent brush the same color as the graph's
// background.
//
// This really isn't a good solution. Is there are better way
// to simulate transparency?
Color oTranslucentColor = oGraphDrawingContext.BackColor;
oTranslucentColor.A = (Byte)( (Byte)255 - btAlpha );
oDrawingContext.DrawRectangle(
CreateFrozenSolidColorBrush(oTranslucentColor), null,
oVertexRectangle);
}
if (sAnnotation != null)
{
oVertexLabelDrawer.DrawLabel(oDrawingContext,
oGraphDrawingContext, oVertexDrawingHistory,
CreateFormattedTextWithWrap(sAnnotation, oColor,
m_oFormattedTextManager.FontSize),
oColor
);
}
}
return (oVertexDrawingHistory);
}
