| public abstract GetLabelLocation ( VertexLabelPosition labelPosition ) : Point | ||
| labelPosition | VertexLabelPosition | |
| return | Point | |
DrawLabel
(
DrawingContext drawingContext,
GraphDrawingContext graphDrawingContext,
VertexDrawingHistory vertexDrawingHistory,
VertexLabelPosition labelPosition,
FormattedText formattedText,
Color formattedTextColor,
Boolean drawBackground
)
{
Debug.Assert(drawingContext != null);
Debug.Assert(graphDrawingContext != null);
Debug.Assert(vertexDrawingHistory != null);
Debug.Assert(formattedText != null);
AssertValid();
if (labelPosition == VertexLabelPosition.Nowhere)
{
return;
}
// The alignment needs to be set before the width and height of the
// FormattedText are obtained.
SetTextAlignment(formattedText, labelPosition);
// You can't use FormattedText.Width to get the width of the actual
// text when text wrapping is enabled (FormattedText.MaxTextWidth > 0).
// Instead, use a method that takes wrapping into account.
Double dLabelWidth = WpfGraphicsUtil.GetFormattedTextSize(
formattedText).Width;
Double dLabelHeight = formattedText.Height;
// This is the point where the label will be drawn using
// DrawingContext.Draw(). It initially assumes a text height of zero,
// a margin of zero, and no adjustment for alignment (see
// dAdjustmentForTextAlignmentX below), but this will be modified
// appropriately within the switch statement below.
Point oDraw = vertexDrawingHistory.GetLabelLocation(labelPosition);
Double dDrawX = oDraw.X;
Double dDrawY = oDraw.Y;
// These are the left and right bounds of the rectangle where the text
// will actually appear.
Double dLabelBoundsLeft = 0;
Double dLabelBoundsRight = 0;
AdjustForTextAlignment(dLabelWidth, dLabelHeight, labelPosition,
formattedText, ref dDrawX, ref dDrawY, ref dLabelBoundsLeft,
ref dLabelBoundsRight);
// Don't let the text exceed the bounds of the graph rectangle.
dDrawX = StayWithinHorizontalBounds(
dDrawX, graphDrawingContext, dLabelBoundsLeft, dLabelBoundsRight);
Double dLabelBoundsTop = dDrawY;
Double dLabelBoundsBottom = dDrawY + dLabelHeight;
dDrawY = StayWithinVerticalBounds(
dDrawY, graphDrawingContext, dLabelBoundsTop, dLabelBoundsBottom);
if (drawBackground)
{
dLabelBoundsLeft = StayWithinHorizontalBounds(
dLabelBoundsLeft, graphDrawingContext,
dLabelBoundsLeft, dLabelBoundsRight);
DrawLabelBackground(drawingContext, graphDrawingContext,
formattedText, formattedTextColor, m_btBackgroundAlpha,
new Point(dLabelBoundsLeft, dDrawY));
}
drawingContext.DrawText(formattedText, new Point(dDrawX, dDrawY));
}
DrawLabel
(
DrawingContext drawingContext,
GraphDrawingContext graphDrawingContext,
VertexDrawingHistory vertexDrawingHistory,
VertexLabelPosition labelPosition,
FormattedText formattedText,
Color formattedTextColor,
Boolean drawBackground
)
{
Debug.Assert(drawingContext != null);
Debug.Assert(graphDrawingContext != null);
Debug.Assert(vertexDrawingHistory != null);
Debug.Assert(formattedText != null);
AssertValid();
if (labelPosition == VertexLabelPosition.Nowhere)
{
return;
}
// The alignment needs to be set before the width and height of the
// FormattedText are obtained.
SetTextAlignment(formattedText, labelPosition);
// You can't use FormattedText.Width to get the width of the actual
// text when text wrapping is enabled (FormattedText.MaxTextWidth > 0).
// Instead, use a method that takes wrapping into account.
Double dLabelWidth = WpfGraphicsUtil.GetFormattedTextSize(
formattedText).Width;
Double dLabelHeight = formattedText.Height;
// This is the point where the label will be drawn using
// DrawingContext.Draw(). It initially assumes a text height of zero,
// a margin of zero, and no adjustment for alignment (see
// dAdjustmentForTextAlignmentX below), but this will be modified
// appropriately within the switch statement below.
Point oDraw = vertexDrawingHistory.GetLabelLocation(labelPosition);
Double dDrawX = oDraw.X;
Double dDrawY = oDraw.Y;
// These are the left and right bounds of the rectangle where the text
// will actually appear.
Double dLabelBoundsLeft = 0;
Double dLabelBoundsRight = 0;
AdjustForTextAlignment(dLabelWidth, dLabelHeight, labelPosition,
formattedText, ref dDrawX, ref dDrawY, ref dLabelBoundsLeft,
ref dLabelBoundsRight);
// Don't let the text exceed the bounds of the graph rectangle.
dDrawX = StayWithinHorizontalBounds(
dDrawX, graphDrawingContext, dLabelBoundsLeft, dLabelBoundsRight);
Double dLabelBoundsTop = dDrawY;
Double dLabelBoundsBottom = dDrawY + dLabelHeight;
dDrawY = StayWithinVerticalBounds(
dDrawY, graphDrawingContext, dLabelBoundsTop, dLabelBoundsBottom);
if (drawBackground)
{
dLabelBoundsLeft = StayWithinHorizontalBounds(
dLabelBoundsLeft, graphDrawingContext,
dLabelBoundsLeft, dLabelBoundsRight);
DrawLabelBackground( drawingContext, graphDrawingContext,
formattedText, formattedTextColor, m_btBackgroundAlpha,
new Point(dLabelBoundsLeft, dDrawY) );
}
drawingContext.DrawText( formattedText, new Point(dDrawX, dDrawY) );
}
