CreateFrozenSolidColorBrush
(
Color oColor
)
{
// AssertValid();
SolidColorBrush oSolidColorBrush = new SolidColorBrush(oColor);
WpfGraphicsUtil.FreezeIfFreezable(oSolidColorBrush);
return(oSolidColorBrush);
}
CreateVisual
(
Point currentMouseLocation,
Color backgroundContrastColor
)
{
Debug.Assert(m_bDragIsInProgress);
AssertValid();
// Limit the drag to the graph margins.
currentMouseLocation =
ForcePointToBeWithinMargins(currentMouseLocation);
m_oMarqueeRectangle = CreateMarqueeRectangle(currentMouseLocation);
DrawingVisual oDrawingVisual = new DrawingVisual();
SolidColorBrush oFillBrush = new SolidColorBrush(Color.FromArgb(
MarqueeFillAlpha,
backgroundContrastColor.R,
backgroundContrastColor.G,
backgroundContrastColor.B
));
SolidColorBrush oOutlineBrush = new SolidColorBrush(Color.FromArgb(
MarqueeOutlineAlpha,
backgroundContrastColor.R,
backgroundContrastColor.G,
backgroundContrastColor.B
));
Pen oOutlinePen = new Pen(oOutlineBrush, 1);
WpfGraphicsUtil.FreezeIfFreezable(oFillBrush);
WpfGraphicsUtil.FreezeIfFreezable(oOutlineBrush);
WpfGraphicsUtil.FreezeIfFreezable(oOutlinePen);
using (DrawingContext oDrawingContext = oDrawingVisual.RenderOpen())
{
oDrawingContext.DrawRectangle(oFillBrush, oOutlinePen,
m_oMarqueeRectangle);
}
m_oVisual = oDrawingVisual;
return(m_oVisual);
}
CreateFrozenPen
(
Brush oBrush,
Double dThickness,
DashStyle oDashStyle
)
{
Debug.Assert(oBrush != null);
Debug.Assert(dThickness > 0);
Debug.Assert(oDashStyle != null);
// AssertValid();
Pen oPen = new Pen(oBrush, dThickness);
oPen.DashStyle = oDashStyle;
oPen.DashCap = PenLineCap.Flat;
WpfGraphicsUtil.FreezeIfFreezable(oPen);
return(oPen);
}
CreateFormattedText
(
String text,
Color color,
Double dFontSize,
Double graphScale
)
{
Debug.Assert(text != null);
Debug.Assert(dFontSize >= 0);
Debug.Assert(graphScale > 0);
SolidColorBrush oBrush = new SolidColorBrush(color);
WpfGraphicsUtil.FreezeIfFreezable(oBrush);
FormattedText oFormattedText = new FormattedText(text,
CultureInfo.CurrentCulture, FlowDirection.LeftToRight, m_oTypeface,
dFontSize * graphScale, oBrush);
return(oFormattedText);
}
GetDashStyle
(
IEdge oEdge,
Double dWidth,
Boolean bDrawAsSelected
)
{
Debug.Assert(oEdge != null);
Debug.Assert(dWidth >= 0);
AssertValid();
// Note:
//
// An early implementation used the predefined DashStyle objects
// provided by the DashStyles class, but those did not look good at
// smaller edge widths. This implementation builds the DashStyle's
// Dashes collection from scratch.
Double [] adDashes = null;
if (!bDrawAsSelected)
{
Object oPerEdgeStyleAsObject;
// Check for a per-edge style.
if (oEdge.TryGetValue(ReservedMetadataKeys.PerEdgeStyle,
typeof(EdgeStyle), out oPerEdgeStyleAsObject))
{
switch ((EdgeStyle)oPerEdgeStyleAsObject)
{
case EdgeStyle.Solid:
break;
case EdgeStyle.Dash:
adDashes = new Double[] { 4.0, 2.0 };
break;
case EdgeStyle.Dot:
adDashes = new Double[] { 1.0, 2.0 };
break;
case EdgeStyle.DashDot:
adDashes = new Double[] { 4.0, 2.0, 1.0, 2.0 };
break;
case EdgeStyle.DashDotDot:
adDashes = new Double[] { 4.0, 2.0, 1.0, 2.0, 1.0, 2.0 };
break;
default:
throw new FormatException(String.Format(
"{0}: The edge with the ID {1} has an invalid {2}"
+ " value."
,
this.ClassName,
oEdge.ID,
"ReservedMetadataKeys.PerEdgeStyle"
));
}
}
}
if (adDashes == null)
{
return(DashStyles.Solid);
}
DashStyle oDashStyle = new DashStyle();
oDashStyle.Dashes = new DoubleCollection(adDashes);
WpfGraphicsUtil.FreezeIfFreezable(oDashStyle);
return(oDashStyle);
}
