57 lines
2.1 KiB
C#
57 lines
2.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Drawing.Drawing2D;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace XKRS.UI.Helper
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{
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internal static class PointHelper
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{
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public static Point ToPoint(this PointF pf)
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{
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return new Point((int)pf.X, (int)pf.Y);
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}
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/// <summary>
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/// 将相对于控件的坐标转换为相对于图像的坐标
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/// </summary>
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/// <param name="p">控件中指定点的点位坐标，坐标原点为控件左上角</param>
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/// <returns>该点以图像坐标系为基准的坐标值，坐标原点为图像左上角</returns>
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public static PointF ToImageCoordinate(this Point p, Matrix m)
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{
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PointF pf = new PointF(p.X, p.Y);
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return ToImageCoordinate(pf, m);
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}
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/// <summary>
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/// 将相对于控件的坐标转换为相对于图像的坐标
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/// </summary>
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/// <param name="p">控件中指定点的点位坐标，坐标原点为控件左上角</param>
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/// <returns>该点以图像坐标系为基准的坐标值，坐标原点为图像左上角</returns>
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public static PointF ToImageCoordinate(this PointF p, Matrix m)
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{
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PointF[] ps = new PointF[] { p };
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Matrix invertMatrix = m.Clone();
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//想要从旧空间到新空间的逆变换，所以我们需要对这个矩阵求逆
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invertMatrix.Invert();
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invertMatrix.TransformPoints(ps);
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return ps[0];
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}
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/// <summary>
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/// 将相对于图像的坐标转换为相对于控件坐标系
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/// </summary>
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/// <param name="p">图像中指定点的点位坐标，坐标原点为图像左上角</param>
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/// <returns>该点以空间坐标系为基准的坐标值，坐标原点为空间坐左上角</returns>
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public static PointF ToControlCoordinate(this PointF p, Matrix m)
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{
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PointF[] ps = new PointF[] { p };
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m.TransformPoints(ps);
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return ps[0];
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}
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}
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}
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