using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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namespace Eventech.DynPicture.Model
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{
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/// <summary>
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/// 点坐标拓展
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/// </summary>
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public static class PointFExtension
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{
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/// <summary>
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/// 计算两点间的距离
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/// </summary>
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/// <param name="p1"></param>
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/// <param name="p2"></param>
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/// <returns></returns>
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public static double DistanceTo(this PointF p1, PointF p2)
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{
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return Math.Sqrt((p1.X - p2.X) * (p1.X - p2.X) + (p1.Y - p2.Y) * (p1.Y - p2.Y));
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}
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/// <summary>
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/// 计算点与X轴正方向的夹角弧度
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/// </summary>
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/// <param name="pf"></param>
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/// <returns>夹角弧度</returns>
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public static double RadPox(this PointF pf)
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{
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var x = pf.X;
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var y = pf.Y;
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//P在(0,0)的情况
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if (x == 0 && y == 0) return 0;
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//P在四个坐标轴上的情况：x正、x负、y正、y负
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if (y == 0 && x > 0) return 0;
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if (y == 0 && x < 0) return Math.PI;
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if (x == 0 && y > 0) return Math.PI / 2;
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if (x == 0 && y < 0) return Math.PI / 2 * 3;
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//点在第一、二、三、四象限时的情况
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if (x > 0 && y > 0) return Math.Atan(y / x);
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if (x < 0 && y > 0) return Math.PI - Math.Atan(y / -x);
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if (x < 0 && y < 0) return Math.PI + Math.Atan(-y / -x);
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if (x > 0 && y < 0) return Math.PI * 2 - Math.Atan(-y / x);
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return 0;
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}
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public static double AnglePox(this PointF pf)
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{
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var x = pf.X;
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var y = pf.Y;
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//P在(0,0)的情况
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if (x == 0 && y == 0) return 0;
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//P在四个坐标轴上的情况：x正、x负、y正、y负
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if (y == 0 && x > 0) return 0;
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if (y == 0 && x < 0) return 180;
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if (x == 0 && y > 0) return 270;
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if (x == 0 && y < 0) return 90;
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//点在第一、二、三、四象限时的情况
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if (x > 0 && y > 0) return Math.Atan(y / x);
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if (x < 0 && y > 0) return Math.Atan(y / -x) * 180 - 180;
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if (x < 0 && y < 0) return 180 - Math.Atan(-y / -x) / 180;
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if (x > 0 && y < 0) return Math.PI * 2 - Math.Atan(-y / x);
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return 0;
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}
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/// <summary>
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/// 计算点相对于当前点的顺时针角度
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/// </summary>
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/// <param name="o"></param>
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/// <param name="p"></param>
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/// <returns></returns>
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public static double AngleClockWise(this PointF o, PointF p)
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{
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var x = p.X - o.X;
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var y = p.Y - o.Y;
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//P在(0,0)的情况
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if (x == 0 && y == 0) return 0;
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//P在四个坐标轴上的情况：x正、x负、y正、y负
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if (y == 0 && x > 0) return 0;
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if (y == 0 && x < 0) return 180;
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if (x == 0 && y > 0) return 90;
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if (x == 0 && y < 0) return -90;
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//点在第一、二、三、四象限时的情况
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if (x > 0 && y > 0) return Math.Atan(y / x) * 180 / Math.PI;
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if (x < 0 && y > 0) return 180 - Math.Atan(y / -x) * 180 / Math.PI;
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if (x < 0 && y < 0) return Math.Atan(-y / -x) * 180 / Math.PI - 180;
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if (x > 0 && y < 0) return -Math.Atan(-y / x) * 180 / Math.PI;
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return 0;
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}
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/// <summary>
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/// 获取相对当前点的X轴点
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/// </summary>
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/// <param name="o"></param>
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/// <param name="p"></param>
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/// <returns></returns>
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public static PointF GetXPoint(this PointF o, PointF p)
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{
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var distance = (float)o.DistanceTo(p);
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return new PointF(o.X + distance, o.Y);
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}
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/// <summary>
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/// 计算以当前点为中心旋转角度angle后的新坐标
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/// </summary>
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/// <param name="A">旋转中心坐标</param>
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/// <param name="P">待旋转的坐标</param>
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/// <param name="angle">旋转角度</param>
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/// <param name="isClockWise">true:顺时针/false:逆时针</param>
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/// <returns></returns>
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public static PointF RotatePointF(this PointF A, PointF P, float angle, bool isClockWise = true)
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{
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var rad = angle * Math.PI / 180;
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//点Temp1
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PointF temp1 = new PointF(P.X - A.X, P.Y - A.Y);
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//点Temp1到原点的长度
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double lenO2Temp1 = temp1.DistanceTo(new PointF(0, 0));
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//∠T1OX弧度
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double angT1OX = temp1.RadPox();
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//∠T2OX弧度（T2为T1以O为圆心旋转弧度rad）
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double angT2OX = angT1OX - (!isClockWise ? 1 : -1) * rad;
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//点Temp2
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PointF Temp2 = new PointF((float)(lenO2Temp1 * Math.Cos(angT2OX)), (float)(lenO2Temp1 * Math.Sin(angT2OX)));
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//点Q
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return new PointF(Temp2.X + A.X, Temp2.Y + A.Y);
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}
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}
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}
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