李伟
87 lines
3.6 KiB
C#
87 lines
3.6 KiB
C#
using System;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Media;
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using System.Windows.Shapes;
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namespace XP.ImageProcessing.RoiControl.Models
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{
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/// <summary>一次角度测量的所有视觉元素（顶点V + 射线端点A/B + 两条射线 + 弧线 + 标签）</summary>
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public class AngleGroup
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{
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public Ellipse DotV { get; set; } // 顶点
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public Ellipse DotA { get; set; } // 射线端点A
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public Ellipse DotB { get; set; } // 射线端点B
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public Line LineA { get; set; } // 射线VA
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public Line LineB { get; set; } // 射线VB
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public Path Arc { get; set; } // 角度弧线
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public TextBlock Label { get; set; }
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public Point V { get; set; }
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public Point A { get; set; }
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public Point B { get; set; }
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public double AngleDeg
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{
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get
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{
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double vax = A.X - V.X, vay = A.Y - V.Y;
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double vbx = B.X - V.X, vby = B.Y - V.Y;
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double lenA = Math.Sqrt(vax * vax + vay * vay);
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double lenB = Math.Sqrt(vbx * vbx + vby * vby);
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if (lenA < 0.001 || lenB < 0.001) return 0;
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double dot = vax * vbx + vay * vby;
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double cos = Math.Clamp(dot / (lenA * lenB), -1.0, 1.0);
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return Math.Acos(cos) * 180.0 / Math.PI;
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}
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}
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public void UpdateVisuals()
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{
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// 射线
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LineA.X1 = V.X; LineA.Y1 = V.Y; LineA.X2 = A.X; LineA.Y2 = A.Y;
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LineA.Visibility = Visibility.Visible;
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LineB.X1 = V.X; LineB.Y1 = V.Y; LineB.X2 = B.X; LineB.Y2 = B.Y;
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LineB.Visibility = Visibility.Visible;
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// 弧线
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double vax = A.X - V.X, vay = A.Y - V.Y;
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double vbx = B.X - V.X, vby = B.Y - V.Y;
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double lenA = Math.Sqrt(vax * vax + vay * vay);
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double lenB = Math.Sqrt(vbx * vbx + vby * vby);
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if (lenA < 1 || lenB < 1) { Arc.Visibility = Visibility.Collapsed; return; }
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double arcRadius = Math.Min(30, Math.Min(lenA, lenB) * 0.3);
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if (arcRadius < 8) arcRadius = 8;
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double angleARad = Math.Atan2(vay, vax);
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double angleBRad = Math.Atan2(vby, vbx);
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double cross = vax * vby - vay * vbx;
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double angleDeg = AngleDeg;
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bool isLargeArc = angleDeg > 180;
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var sweepDir = cross >= 0 ? SweepDirection.Clockwise : SweepDirection.Counterclockwise;
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var startPt = new Point(V.X + arcRadius * Math.Cos(angleARad), V.Y + arcRadius * Math.Sin(angleARad));
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var endPt = new Point(V.X + arcRadius * Math.Cos(angleBRad), V.Y + arcRadius * Math.Sin(angleBRad));
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var arcSeg = new ArcSegment(endPt, new Size(arcRadius, arcRadius), 0, isLargeArc, sweepDir, true);
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var fig = new PathFigure(startPt, new[] { arcSeg }, false);
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Arc.Data = new PathGeometry(new[] { fig });
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Arc.Visibility = Visibility.Visible;
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// 标签位置
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double midAngle = (angleARad + angleBRad) / 2.0;
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double testX = Math.Cos(midAngle), testY = Math.Sin(midAngle);
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double testCross = vax * testY - vay * testX;
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if ((cross >= 0 && testCross < 0) || (cross < 0 && testCross >= 0))
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midAngle += Math.PI;
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double labelDist = arcRadius + 16;
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Label.Text = $"{angleDeg:F1}°";
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Canvas.SetLeft(Label, V.X + labelDist * Math.Cos(midAngle) - 15);
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Canvas.SetTop(Label, V.Y + labelDist * Math.Sin(midAngle) - 8);
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Label.Visibility = Visibility.Visible;
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}
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}
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}
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