125 lines
3.2 KiB
C#
125 lines
3.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Windows.Media;
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using System.Windows;
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using Microsoft.Research.DynamicDataDisplay;
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namespace Microsoft.Research.DynamicDataDisplay.Charts.Shapes
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{
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/// <summary>
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/// Paints an arrow with start and end points in viewport coordinates.
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/// </summary>
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public class Arrow : Segment
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="Arrow"/> class.
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/// </summary>
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public Arrow()
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{
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Init();
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="Arrow"/> class.
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/// </summary>
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/// <param name="startPoint">The start point of arrow.</param>
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/// <param name="endPoint">The end pointof arrow .</param>
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public Arrow(Point startPoint, Point endPoint)
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: base(startPoint, endPoint)
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{
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Init();
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}
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private void Init()
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{
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geometryGroup.Children.Add(LineGeometry);
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geometryGroup.Children.Add(leftLineGeometry);
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geometryGroup.Children.Add(rightLineGeometry);
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}
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#region ArrowLength property
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/// <summary>
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/// Gets or sets the length of the arrow.
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/// </summary>
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/// <value>The length of the arrow.</value>
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public double ArrowLength
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{
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get { return (double)GetValue(ArrowLengthProperty); }
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set { SetValue(ArrowLengthProperty, value); }
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}
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/// <summary>
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/// Identifies ArrowLength dependency property.
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/// </summary>
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public static readonly DependencyProperty ArrowLengthProperty = DependencyProperty.Register(
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"ArrowLength",
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typeof(double),
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typeof(Arrow),
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new FrameworkPropertyMetadata(0.1, OnPointChanged));
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#endregion
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#region ArrowAngle property
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/// <summary>
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/// Gets or sets the arrow angle in degrees.
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/// </summary>
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/// <value>The arrow angle.</value>
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public double ArrowAngle
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{
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get { return (double)GetValue(ArrowAngleProperty); }
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set { SetValue(ArrowAngleProperty, value); }
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}
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/// <summary>
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/// Identifies ArrowAngle dependency property.
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/// </summary>
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public static readonly DependencyProperty ArrowAngleProperty = DependencyProperty.Register(
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"ArrowAngle",
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typeof(double),
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typeof(Arrow),
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new FrameworkPropertyMetadata(15.0, OnPointChanged));
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#endregion
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protected override void UpdateUIRepresentationCore()
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{
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base.UpdateUIRepresentationCore();
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var transform = Plotter.Viewport.Transform;
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Point p1 = StartPoint.DataToScreen(transform);
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Point p2 = EndPoint.DataToScreen(transform);
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Vector arrowVector = p1 - p2;
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Vector arrowCapVector = ArrowLength * arrowVector;
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Matrix leftMatrix = Matrix.Identity;
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leftMatrix.Rotate(ArrowAngle);
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Matrix rightMatrix = Matrix.Identity;
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rightMatrix.Rotate(-ArrowAngle);
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Vector leftArrowLine = leftMatrix.Transform(arrowCapVector);
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Vector rightArrowLine = rightMatrix.Transform(arrowCapVector);
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leftLineGeometry.StartPoint = p2;
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rightLineGeometry.StartPoint = p2;
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leftLineGeometry.EndPoint = p2 + leftArrowLine;
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rightLineGeometry.EndPoint = p2 + rightArrowLine;
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}
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private LineGeometry leftLineGeometry = new LineGeometry();
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private LineGeometry rightLineGeometry = new LineGeometry();
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private GeometryGroup geometryGroup = new GeometryGroup();
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protected override Geometry DefiningGeometry
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{
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get { return geometryGroup; }
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}
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}
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}
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