/// <summary>
/// 设置位置
/// </summary>
public void SetPosition()
{
#region 弧线
this.lineElement.Point = this.EndPoint;
this.LinePathFigureElement.StartPoint = this.StartPoint;
this.lineElement.IsLargeArc = this.IsLargeArc;
this.lineElement.SweepDirection = this.LineSweepDirection;
this.lineElement.Size = new Size(this.Radius, this.Radius);
#endregion
#region 箭头
Point roundCenter = new Point();
double k1;
//求圆心
try
{
roundCenter = MathExtension.GetRoundCenter(this.StartPoint, this.EndPoint, this.Radius, this.LineSweepDirection, this.IsLargeArc);
//圆心与箭头点连线的斜率
k1 = (roundCenter.Y - this.EndPoint.Y) / (roundCenter.X - this.EndPoint.X);
}
catch (Exception ex)
{
if (ex is RadiusException)
{
k1 = (-1) * (this.StartPoint.X - this.EndPoint.X) / (this.StartPoint.Y - this.EndPoint.Y);
this.lineElement.Size = new Size(0, 1);
}
else
{
return;
}
}
Point centerPoint1, centerPoint2, endPoint11, endPoint12, endPoint21, endPoint22;
//切线斜率
double k2 = 0;
if (double.IsInfinity(k1)) //与Y轴平行
{
//中间点
this._CenterPoint.X = (this.StartPoint.X + this.EndPoint.X) / 2;
this._CenterPoint.Y = (this.StartPoint.Y + this.EndPoint.Y) / 2;
//如果是直线,直线与X轴平行
if (this.IsBeeline)
{
if (this.StartPoint.X < this.EndPoint.X)
{
this.arrowStartElement.StartPoint = new Point(this.EndPoint.X - this.ArrowSize.Height, this.EndPoint.Y - this.ArrowSize.Width);
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(this.EndPoint);
this.arrowElement.Points.Add(new Point(this.EndPoint.X - this.ArrowSize.Height, this.EndPoint.Y + this.ArrowSize.Width));
}
else
{
this.arrowStartElement.StartPoint = new Point(this.EndPoint.X + this.ArrowSize.Height, this.EndPoint.Y - this.ArrowSize.Width);
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(this.EndPoint);
this.arrowElement.Points.Add(new Point(this.EndPoint.X + this.ArrowSize.Height, this.EndPoint.Y + this.ArrowSize.Width));
}
}
}
else if (Math.Round(k1, 4) == 0)//与X轴平行
{
//中间点
this._CenterPoint.X = (this.StartPoint.X + this.EndPoint.X) / 2;
this._CenterPoint.Y = (this.StartPoint.Y + this.EndPoint.Y) / 2;
//如果是直线
if (this.IsBeeline)
{
if (this.StartPoint.Y < this.EndPoint.Y)
{
this.arrowStartElement.StartPoint = new Point(this.EndPoint.X - this.ArrowSize.Width, this.EndPoint.Y - this.ArrowSize.Height);
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(this.EndPoint);
this.arrowElement.Points.Add(new Point(this.EndPoint.X + this.ArrowSize.Width, this.EndPoint.Y - this.ArrowSize.Height));
}
else
{
this.arrowStartElement.StartPoint = new Point(this.EndPoint.X - this.ArrowSize.Width, this.EndPoint.Y + this.ArrowSize.Height);
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(this.EndPoint);
this.arrowElement.Points.Add(new Point(this.EndPoint.X + this.ArrowSize.Width, this.EndPoint.Y + this.ArrowSize.Height));
}
}
}
else
{
k2 = (-1) / k1;
double xOffset = this.ArrowSize.Height / (Math.Sqrt(1 + k2 * k2));
double xTemp, yTemp;
#region 第一个点
xTemp = this.EndPoint.X + xOffset;
yTemp = k2 * (xTemp - this.EndPoint.X) + this.EndPoint.Y;
centerPoint1 = new Point(Math.Round(xTemp, 4), Math.Round(yTemp, 4));
#endregion
#region 第二个点
xTemp = this.EndPoint.X - xOffset;
yTemp = k2 * (xTemp - this.EndPoint.X) + this.EndPoint.Y;
centerPoint2 = new Point(Math.Round(xTemp, 4), Math.Round(yTemp, 4));
#endregion
k2 = k1;
xOffset = this.ArrowSize.Width / (Math.Sqrt(1 + k2 * k2));
#region 第一个点对应的两个箭头端点
xTemp = centerPoint1.X + xOffset;
yTemp = k2 * (xTemp - centerPoint1.X) + centerPoint1.Y;
endPoint11 = new Point(Math.Round(xTemp, 4), Math.Round(yTemp, 4));
xTemp = centerPoint1.X - xOffset;
yTemp = k2 * (xTemp - centerPoint1.X) + centerPoint1.Y;
endPoint12 = new Point(Math.Round(xTemp, 4), Math.Round(yTemp, 4));
#endregion
#region 第二个点对应的两个箭头端点
xTemp = centerPoint2.X + xOffset;
yTemp = k2 * (xTemp - centerPoint2.X) + centerPoint2.Y;
endPoint21 = new Point(Math.Round(xTemp, 4), Math.Round(yTemp, 4));
xTemp = centerPoint2.X - xOffset;
yTemp = k2 * (xTemp - centerPoint2.X) + centerPoint2.Y;
endPoint22 = new Point(Math.Round(xTemp, 4), Math.Round(yTemp, 4));
#endregion
//小弧
if (!this.IsLargeArc)
{
#region 小弧
//如果是直线,则比较点与起点的距离,取距离近的两点
if (this.IsBeeline)
{
double d1 = (endPoint11.X - this.StartPoint.X) * (endPoint11.X - this.StartPoint.X) + (endPoint11.Y - this.StartPoint.Y) * (endPoint11.Y - this.StartPoint.Y);
double d2 = (endPoint21.X - this.StartPoint.X) * (endPoint21.X - this.StartPoint.X) + (endPoint21.Y - this.StartPoint.Y) * (endPoint21.Y - this.StartPoint.Y);
if (d1 < d2)
{
this.arrowStartElement.StartPoint = endPoint11;
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(this.EndPoint);
this.arrowElement.Points.Add(endPoint12);
}
else
{
this.arrowStartElement.StartPoint = endPoint21;
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(this.EndPoint);
this.arrowElement.Points.Add(endPoint22);
}
}
else
{
//是否是同一边
if (MathExtension.GetPointLeftOrRight(roundCenter, this.EndPoint, this.StartPoint) == MathExtension.GetPointLeftOrRight(roundCenter, this.EndPoint, centerPoint1))
{
this.arrowStartElement.StartPoint = endPoint11;
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(this.EndPoint);
this.arrowElement.Points.Add(endPoint12);
}
else
{
this.arrowStartElement.StartPoint = endPoint21;
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(this.EndPoint);
this.arrowElement.Points.Add(endPoint22);
}
}
#endregion
}
else
{
#region 大弧
//如果是直线,则比较点与起点的距离,取距离近的两点
if (this.IsBeeline)
{
double d1 = (endPoint11.X - this.StartPoint.X) * (endPoint11.X - this.StartPoint.X) + (endPoint11.Y - this.StartPoint.Y) * (endPoint11.Y - this.StartPoint.Y);
double d2 = (endPoint21.X - this.StartPoint.X) * (endPoint21.X - this.StartPoint.X) + (endPoint21.Y - this.StartPoint.Y) * (endPoint21.Y - this.StartPoint.Y);
if (d1 < d2)
{
this.arrowStartElement.StartPoint = endPoint11;
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(this.EndPoint);
this.arrowElement.Points.Add(endPoint12);
}
else
{
this.arrowStartElement.StartPoint = endPoint21;
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(this.EndPoint);
this.arrowElement.Points.Add(endPoint22);
}
}
else
{
//是否是不同一边
if (MathExtension.GetPointLeftOrRight(roundCenter, this.EndPoint, this.StartPoint) == (-1) * MathExtension.GetPointLeftOrRight(roundCenter, this.EndPoint, centerPoint1))
{
this.arrowStartElement.StartPoint = endPoint11;
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(this.EndPoint);
this.arrowElement.Points.Add(endPoint12);
}
else
{
this.arrowStartElement.StartPoint = endPoint21;
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(this.EndPoint);
this.arrowElement.Points.Add(endPoint22);
}
}
#endregion
}
this.GetCenterPositen(roundCenter);
}
#endregion
}
