/// <summary>
/// Adds a Cairo path that represents a pair of X cursor markers aligned at the current Cairo position.
/// </summary>
private void AddXCursorMarkerPairPathFromCurrentPosition(PointD topMarkerPosition, PointD bottomMarkerPosition,
ScopeHorizontalAlignment horizontalAlignment)
{
Context.MoveTo(bottomMarkerPosition);
AddXCursorMarkerPathFromCurrentPosition(horizontalAlignment, ScopeVerticalAlignment.Bottom);
Context.MoveTo(topMarkerPosition);
AddXCursorMarkerPathFromCurrentPosition(horizontalAlignment, ScopeVerticalAlignment.Top);
}
/// <summary>
/// Draws a text aligned with a certain distance to the specified user-specific position.
/// </summary>
private void DrawText(RectangleRange rectangleRange,
string text, PointD position, Color textColor,
ScopeHorizontalAlignment horizontalAlignment, ScopeVerticalAlignment verticalAlignment,
Distance alignmentDistance)
{
var devicePosition = rectangleRange.Matrix.TransformPoint(position);
DrawText(text, devicePosition, textColor, horizontalAlignment, verticalAlignment,
alignmentDistance);
}
/// <summary>
/// Initializes an instance of this class.
/// </summary>
/// <param name="textProvider">A function returning the caption text.</param>
/// <param name="horizontalAlignment">
/// The horizontal alignment with respect to the specified alignment reference.
/// </param>
/// <param name="verticalAlignment">
/// The vertical alignment with respect to the specified alignment reference.
/// </param>
/// <param name="alignmentReference">
/// The reference used for horizontal and vertical alignment.</param>
/// <param name="yieldToMarker">
/// A value indicating whether to provide additional space for the cursor marker.
/// </param>
/// <param name="color">The caption color.</param>
public ScopePositionCaption(Func <string> textProvider, ScopeHorizontalAlignment horizontalAlignment,
ScopeVerticalAlignment verticalAlignment, ScopeAlignmentReference alignmentReference, bool yieldToMarker,
Color color)
{
TextProvider = textProvider;
HorizontalAlignment = horizontalAlignment;
VerticalAlignment = verticalAlignment;
AlignmentReference = alignmentReference;
YieldToMarker = yieldToMarker;
Color = color;
}
/// <summary>
/// Draws a text aligned with a certain distance to the specified user-specific position
/// at the horizontal edge.
/// </summary>
private void DrawTextAtHorizontalEdge(RectangleRange rectangleRange,
string text, double xPosition, Color textColor,
ScopeHorizontalAlignment horizontalAlignment, ScopeVerticalAlignment verticalAlignment,
Distance alignmentDistance)
{
var yPosition = verticalAlignment == ScopeVerticalAlignment.Bottom
? rectangleRange.MinY : rectangleRange.MaxY;
DrawText(rectangleRange, text, new PointD(xPosition, yPosition), textColor,
horizontalAlignment, verticalAlignment, alignmentDistance);
}
/// <summary>
/// Adds a Cairo path that represents a Y cursor marker aligned at the current Cairo position.
/// </summary>
private void AddYCursorMarkerPathFromCurrentPosition(ScopeHorizontalAlignment horizontalAlignment,
ScopeVerticalAlignment verticalAlignment)
{
var horizontalSign = horizontalAlignment == ScopeHorizontalAlignment.Right
? -1 : +1;
var verticalSign = verticalAlignment == ScopeVerticalAlignment.Bottom
? -1 : +1;
Context.RelLineTo(horizontalSign * _longitudinalCursorMarkerSize, 0);
Context.RelLineTo(horizontalSign * -_longitudinalCursorMarkerSize / 2, verticalSign * _lateralCursorMarkerSize);
Context.RelLineTo(horizontalSign * -_longitudinalCursorMarkerSize / 2, 0);
Context.ClosePath();
}
/// <summary>
/// Draws a text aligned with a certain distance to the specified device position.
/// </summary>
private void DrawText(string text, PointD position, Color textColor,
ScopeHorizontalAlignment horizontalAlignment, ScopeVerticalAlignment verticalAlignment,
Distance alignmentDistance)
{
using (CreateContextState())
{
SetFontToStandardSettings();
var extents = Context.TextExtents(text);
var deviceDistance = new Distance(
horizontalAlignment == ScopeHorizontalAlignment.Right
? -alignmentDistance.Dx - extents.Width : alignmentDistance.Dx,
verticalAlignment == ScopeVerticalAlignment.Bottom
? -alignmentDistance.Dy : alignmentDistance.Dy + extents.Height
);
Context.MoveTo(position);
Context.RelMoveTo(deviceDistance);
Context.SetSourceColor(textColor);
Context.ShowText(text);
}
}