77 lines
2.0 KiB
C#
77 lines
2.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Drawing;
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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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namespace Io.Github.Kerwinxu.LibShapes.Core
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{
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/// <summary>
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/// 这个是虚拟坐标跟画布上的坐标转换的
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/// Offset 是偏移，而Zoom是放大倍数
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/// </summary>
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public class PointTransform
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{
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public float OffsetX { get; set; }
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public float OffsetY { get; set; }
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private float _zoom=1; // 默认值1
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public float Zoom
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{
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get { return _zoom; }
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set { _zoom= value; if (value <= 0) _zoom = 1; } // 如果小于等于0，就用默认值1吧。
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}
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/// <summary>
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/// 这个转成画布的坐标
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/// </summary>
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/// <param name="pointF"></param>
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/// <returns></returns>
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public PointF CanvasToVirtualPoint(PointF pointF)
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{
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return new PointF() {
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X = (pointF.X - OffsetX) / Zoom , // 这个是加偏移
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Y = (pointF.Y - OffsetY) / Zoom
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};
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}
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/// <summary>
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/// 这个转成虚拟的坐标
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/// </summary>
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/// <param name="pointF"></param>
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/// <returns></returns>
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public PointF VirtualToCanvasPoint(PointF pointF)
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{
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return new PointF()
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{
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X = OffsetX + pointF.X * Zoom ,
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Y = OffsetY + pointF.Y * Zoom
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};
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}
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public Matrix GetMatrix()
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{
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Matrix matrix = new Matrix();
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matrix.Translate(OffsetX, OffsetY);
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matrix.Scale(Zoom, Zoom);
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return matrix;
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}
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/// <summary>
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/// 像素转成毫米
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/// </summary>
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/// <param name="g"></param>
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/// <param name="pointF"></param>
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/// <returns></returns>
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public static PointF pixToMM(float dpiX, float dpiY, PointF pointF)
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{
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return new PointF(pointF.X/ dpiX * 25.4f,pointF.Y/ dpiY * 25.4f);
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}
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}
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}
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