private List <Element> GetRects()
{
Pts.Clear();
_rects.Clear();
if (Pt1.Equals(Pt2))
{
int halfW = PointLineWidth / 2;
int halfH = PointLineHeight / 2;
for (int i = 0; i < DispersePointCount; i++)
{
RectangleF rect = new RectangleF(Pt1.X - halfW, Pt1.Y - halfH, PointLineWidth, PointLineHeight);
_rects.Add(new RectLineElement(rect)
{
AutoChangeSize = false, BorderWidth = this.BorderWidth, ForeColor = this.ForeColor
});
}
}
else
{
A = Pt2.Y - Pt1.Y;
B = Pt1.X - Pt2.X;
C = Pt2.X * Pt1.Y - Pt1.X * Pt2.Y;
float offsetX = (Pt2.X - Pt1.X) / (DispersePointCount - 1);
float offsetY = (Pt2.Y - Pt1.Y) / (DispersePointCount - 1);
int halfW = PointLineWidth / 2;
int halfH = PointLineHeight / 2;
double aphla = Math.Atan((Pt2.Y - Pt1.Y) / (Pt2.X - Pt1.X));
int angle = (int)(aphla / Math.PI * 180);
if ((Pt2.X - Pt1.X) < 0)
{
angle = angle + 180;
}
Debug.WriteLine($"aphla={aphla} angle={angle}");
for (int i = 0; i < DispersePointCount; i++)
{
float x = Pt1.X + i * offsetX;
float y = B == 0 ? Pt1.Y + i * offsetY : -(A * x + C) / B;
Pts.Add(new PointF(x, y));
RectangleF rect = new RectangleF(x - halfW, y - halfH, PointLineWidth, PointLineHeight);
_rects.Add(new RectLineElement(rect, angle)
{
AutoChangeSize = false, BorderWidth = this.BorderWidth, ForeColor = this.ForeColor
});
}
}
return(_rects);
}
public float GetDistance(float x, float y)
{
float dis = 0f;
if (Pt1.Equals(Pt2))
{
dis = GetLength(x, y, Pt1.X, Pt1.Y);
}
else
{
float a = Pt2.Y - Pt1.Y;
float b = Pt1.X - Pt2.X;
float c = Pt2.X * Pt1.Y - Pt1.X * Pt2.Y;
dis = (float)(Math.Abs(a * x + b * y + c) / Math.Sqrt(a * a + b * b));
}
return(dis);
}
public override bool Equals(Shape other)
{
if (other == null)
{
return(false);
}
if (other is LineSegment)
{
var lineSeg = other as LineSegment;
bool equalPt1 = Pt1.Equals(lineSeg.Pt1);
bool equalPt2 = Pt2.Equals(lineSeg.Pt2);
if (!(equalPt1 || equalPt2))
{
return(false);
}
}
return(base.Equals(other));
}