李伟
117 lines
4.9 KiB
C#
117 lines
4.9 KiB
C#
// ============================================================================
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// Copyright © 2026 Hexagon Technology Center GmbH. All Rights Reserved.
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// 文件名: PointToLineProcessor.cs
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// 描述: 点到直线距离测量算子
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// 功能:
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// - 用户定义一条直线（两个端点）和一个测量点
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// - 计算测量点到直线的垂直距离
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// - 支持像素尺寸标定输出物理距离
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// - 在图像上绘制直线、测量点、垂足和距离标注
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// 算法: 点到直线距离公式
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// 作者: 李伟 wei.lw.li@hexagon.com
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// ============================================================================
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using Emgu.CV;
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using Emgu.CV.CvEnum;
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using Emgu.CV.Structure;
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using XP.ImageProcessing.Core;
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using Serilog;
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using System.Drawing;
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namespace XP.ImageProcessing.Processors;
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public class PointToLineProcessor : ImageProcessorBase
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{
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private static readonly ILogger _logger = Log.ForContext<PointToLineProcessor>();
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public PointToLineProcessor()
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{
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Name = LocalizationHelper.GetString("PointToLineProcessor_Name");
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Description = LocalizationHelper.GetString("PointToLineProcessor_Description");
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}
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protected override void InitializeParameters()
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{
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// 直线两端点 + 测量点（由交互控件注入）
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Parameters.Add("L1X", new ProcessorParameter("L1X", "L1X", typeof(int), 100, null, null, "") { IsVisible = false });
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Parameters.Add("L1Y", new ProcessorParameter("L1Y", "L1Y", typeof(int), 200, null, null, "") { IsVisible = false });
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Parameters.Add("L2X", new ProcessorParameter("L2X", "L2X", typeof(int), 400, null, null, "") { IsVisible = false });
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Parameters.Add("L2Y", new ProcessorParameter("L2Y", "L2Y", typeof(int), 200, null, null, "") { IsVisible = false });
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Parameters.Add("PX", new ProcessorParameter("PX", "PX", typeof(int), 250, null, null, "") { IsVisible = false });
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Parameters.Add("PY", new ProcessorParameter("PY", "PY", typeof(int), 100, null, null, "") { IsVisible = false });
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Parameters.Add("PixelSize", new ProcessorParameter(
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"PixelSize",
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LocalizationHelper.GetString("PointToLineProcessor_PixelSize"),
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typeof(double), 1.0, null, null,
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LocalizationHelper.GetString("PointToLineProcessor_PixelSize_Desc")));
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Parameters.Add("Unit", new ProcessorParameter(
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"Unit",
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LocalizationHelper.GetString("PointToLineProcessor_Unit"),
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typeof(string), "px", null, null,
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LocalizationHelper.GetString("PointToLineProcessor_Unit_Desc"),
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new string[] { "px", "mm", "μm", "cm" }));
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Parameters.Add("Thickness", new ProcessorParameter(
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"Thickness",
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LocalizationHelper.GetString("PointToLineProcessor_Thickness"),
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typeof(int), 2, 1, 10,
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LocalizationHelper.GetString("PointToLineProcessor_Thickness_Desc")));
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}
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public override Image<Gray, byte> Process(Image<Gray, byte> inputImage)
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{
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int l1x = GetParameter<int>("L1X"), l1y = GetParameter<int>("L1Y");
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int l2x = GetParameter<int>("L2X"), l2y = GetParameter<int>("L2Y");
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int px = GetParameter<int>("PX"), py = GetParameter<int>("PY");
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double pixelSize = GetParameter<double>("PixelSize");
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string unit = GetParameter<string>("Unit");
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int thickness = GetParameter<int>("Thickness");
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OutputData.Clear();
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// 点到直线距离公式: |AB × AP| / |AB|
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double abx = l2x - l1x, aby = l2y - l1y;
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double abLen = Math.Sqrt(abx * abx + aby * aby);
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double pixelDistance = 0;
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int footX = px, footY = py;
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if (abLen > 0.001)
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{
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// 叉积求距离
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double cross = Math.Abs(abx * (l1y - py) - aby * (l1x - px));
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pixelDistance = cross / abLen;
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// 垂足: 投影参数 t = AP·AB / |AB|²
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double apx = px - l1x, apy = py - l1y;
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double t = (apx * abx + apy * aby) / (abLen * abLen);
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footX = (int)(l1x + t * abx);
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footY = (int)(l1y + t * aby);
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OutputData["ProjectionT"] = t;
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}
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double actualDistance = pixelDistance * pixelSize;
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string distanceText = unit == "px"
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? $"{pixelDistance:F2} px"
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: $"{actualDistance:F4} {unit} ({pixelDistance:F2} px)";
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OutputData["PointToLineResult"] = true;
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OutputData["Line1"] = new Point(l1x, l1y);
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OutputData["Line2"] = new Point(l2x, l2y);
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OutputData["MeasurePoint"] = new Point(px, py);
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OutputData["FootPoint"] = new Point(footX, footY);
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OutputData["PixelDistance"] = pixelDistance;
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OutputData["ActualDistance"] = actualDistance;
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OutputData["Unit"] = unit;
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OutputData["Thickness"] = thickness;
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OutputData["DistanceText"] = distanceText;
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_logger.Information("PointToLine: Distance={Dist}, Foot=({FX},{FY})", distanceText, footX, footY);
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return inputImage.Clone();
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}
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}
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