/// <summary>
/// 设置位置
/// </summary>
public void SetPosition()
{
#region 弧线
lineElement.Point2 = new Point(EndPointX, EndPointY);
LinePathFigureElement.StartPoint = new Point(StartPointX, StartPointY);
#endregion
#region 箭头
Point roundCenter = new Point();
Point textCenterPoint;
double k1;
//求圆心
try
{
roundCenter = MathExtension.GetBezierCenter(LinePathFigureElement.StartPoint, lineElement.Point2, RadiusRadio * Length, this.LineSweepDirection);
var cp = new Point()
{
X = (StartPointX + EndPointX) / 2,
Y = (StartPointY + EndPointY) / 2,
};
textCenterPoint = new Point()
{
X = (cp.X + roundCenter.X) / 2,
Y = (cp.Y + roundCenter.Y) / 2,
};
//圆心与箭头点连线的斜率
k1 = (roundCenter.Y - this.EndPointY) / (roundCenter.X - this.EndPointX);
}
catch (Exception ex)
{
if (ex is RadiusException)
{
k1 = (-1) * (this.StartPointX - this.EndPointX) / (this.StartPointY - this.EndPointY);
textCenterPoint = roundCenter = new Point()
{
X = (this.StartPointX + this.EndPointX) / 2,
Y = (this.StartPointY + this.EndPointY) / 2
};
SetLinePosition();
textBoxElement.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
Canvas.SetLeft(textBoxElement, textCenterPoint.X - textBoxElement.DesiredSize.Width / 2);
Canvas.SetTop(textBoxElement, textCenterPoint.Y - textBoxElement.DesiredSize.Height / 2);
return;
}
else
{
return;
}
}
this.lineElement.Point1 = roundCenter;
Point centerPoint1, centerPoint2, endPoint11, endPoint12, endPoint21, endPoint22;
//切线斜率
double k2 = 0;
{
k2 = k1;
double xOffset = this.ArrowSize.Height / (Math.Sqrt(1 + k2 * k2));
double xTemp, yTemp;
#region 第一个点
xTemp = this.EndPointX + xOffset;
yTemp = k2 * (xTemp - this.EndPointX) + this.EndPointY;
centerPoint1 = new Point(Math.Round(xTemp, 4), Math.Round(yTemp, 4));
#endregion
#region 第二个点
xTemp = this.EndPointX - xOffset;
yTemp = k2 * (xTemp - this.EndPointX) + this.EndPointY;
centerPoint2 = new Point(Math.Round(xTemp, 4), Math.Round(yTemp, 4));
#endregion
k2 = (-1) / 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
#region 永远找和圆心距离近的那组点
{
double d1 = (endPoint11.X - roundCenter.X) * (endPoint11.X - roundCenter.X) + (endPoint11.Y - roundCenter.Y) * (endPoint11.Y - roundCenter.Y);
double d2 = (endPoint21.X - roundCenter.X) * (endPoint21.X - roundCenter.X) + (endPoint21.Y - roundCenter.Y) * (endPoint21.Y - roundCenter.Y);
//if (this.LineSweepDirection== SweepDirection.Clockwise)
if (d1 < d2)
{
this.arrowStartElement.StartPoint = endPoint11;
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(lineElement.Point2);
this.arrowElement.Points.Add(endPoint12);
}
else
{
this.arrowStartElement.StartPoint = endPoint21;
this.arrowElement.Points.Clear();
this.arrowElement.Points.Add(lineElement.Point2);
this.arrowElement.Points.Add(endPoint22);
}
}
#endregion
}
#endregion
textBoxElement.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
Canvas.SetLeft(textBoxElement, textCenterPoint.X - textBoxElement.DesiredSize.Width / 2);
Canvas.SetTop(textBoxElement, textCenterPoint.Y - textBoxElement.DesiredSize.Height / 2);
}
