public static void DrawTwoPoints(this Graphics g, Pen pen, PointF pf1, PointF pf2, Rectangle rect, bool smooth = true)
{
if (pf1.X.IsNan() || pf1.Y.IsNan() || pf2.X.IsNan() || pf2.Y.IsNan())
{
return;
}
bool haveLargePixel = Math.Abs(pf1.X - pf2.X) >= rect.Width * 100 || Math.Abs(pf1.Y - pf2.Y) >= rect.Height * 100;
//两点都在区域内
if (pf1.InRect(rect) && pf2.InRect(rect))
{
g.Smooth(smooth);
g.DrawLine(pen, pf1, pf2);
g.Smooth(false);
return;
}
//无大坐标像素
if (!haveLargePixel)
{
g.Smooth(smooth);
g.DrawLine(pen, pf1, pf2);
g.Smooth(false);
return;
}
//垂直线
if (pf1.X.Equals(pf2.X))
{
if (pf1.X <= rect.Left)
{
return;
}
if (pf1.X >= rect.Right)
{
return;
}
if (pf1.Y <= rect.Top && pf2.Y <= rect.Top)
{
return;
}
if (pf1.Y >= rect.Bottom && pf2.Y >= rect.Bottom)
{
return;
}
g.Smooth(smooth);
float yy1 = Math.Min(pf1.Y, pf2.Y);
float yy2 = Math.Max(pf1.Y, pf2.Y);
if (yy1 <= rect.Top)
{
if (yy2 <= rect.Bottom)
{
g.DrawLine(pen, pf1.X, rect.Top, pf1.X, yy2);
}
else
{
g.DrawLine(pen, pf1.X, rect.Top, pf1.X, rect.Bottom);
}
}
else
{
if (yy2 <= rect.Bottom)
{
g.DrawLine(pen, pf1.X, yy1, pf1.X, yy2);
}
else
{
g.DrawLine(pen, pf1.X, yy1, pf1.X, rect.Bottom);
}
}
g.Smooth(false);
return;
}
//水平线
if (pf1.Y.Equals(pf2.Y))
{
if (pf1.Y <= rect.Top)
{
return;
}
if (pf1.Y >= rect.Bottom)
{
return;
}
if (pf1.X <= rect.Left && pf2.X <= rect.Left)
{
return;
}
if (pf1.X >= rect.Right && pf2.X >= rect.Right)
{
return;
}
g.Smooth(smooth);
float xx1 = Math.Min(pf1.X, pf2.X);
float xx2 = Math.Max(pf1.X, pf2.X);
if (xx1 <= rect.Left)
{
if (xx2 <= rect.Right)
{
g.DrawLine(pen, rect.Left, pf1.Y, xx2, pf1.Y);
}
else
{
g.DrawLine(pen, rect.Left, pf1.Y, rect.Right, pf1.Y);
}
}
else
{
if (xx2 <= rect.Right)
{
g.DrawLine(pen, xx1, pf1.Y, xx2, pf1.Y);
}
else
{
g.DrawLine(pen, xx1, pf1.Y, rect.Right, pf1.Y);
}
}
g.Smooth(false);
return;
}
//判断两个区域是否相交
RectangleF rect1 = pf1.CreateRectangleF(pf2);
if (!rect1.IsOverlap(rect))
{
return;
}
double x1 = Drawing.CalcX(pf1, pf2, rect.Top);
double x2 = Drawing.CalcX(pf1, pf2, rect.Bottom);
double y1 = Drawing.CalcY(pf1, pf2, rect.Left);
double y2 = Drawing.CalcY(pf1, pf2, rect.Right);
//判断线段是否和区域有交点
bool isExist = x1.InRange(rect.Left, rect.Right) || x2.InRange(rect.Left, rect.Right) || y1.InRange(rect.Top, rect.Bottom) || y2.InRange(rect.Top, rect.Bottom);
if (!isExist)
{
return;
}
List <PointF> TwoPoints = new List <PointF>();
if (!pf1.InRect(rect) && !pf2.InRect(rect))
{
if (x1.InRange(rect.Left, rect.Right))
{
TwoPoints.Add(new PointF((float)x1, rect.Top));
}
if (x2.InRange(rect.Left, rect.Right))
{
TwoPoints.Add(new PointF((float)x2, rect.Bottom));
}
if (y1.InRange(rect.Top, rect.Bottom))
{
TwoPoints.Add(new PointF(rect.Left, (float)y1));
}
if (y2.InRange(rect.Top, rect.Bottom))
{
TwoPoints.Add(new PointF(rect.Right, (float)y2));
}
}
else
{
PointF center = pf1.InRect(rect) ? pf1 : pf2;
PointF border = pf2.InRect(rect) ? pf1 : pf2;
TwoPoints.Add(center);
if (border.X >= center.X)
{
if (border.Y >= center.Y)
{
TwoPoints.Add(x2 <= rect.Right ? new PointF((float)x2, rect.Bottom) : new PointF(rect.Right, (float)y2));
}
else
{
TwoPoints.Add(x1 <= rect.Right ? new PointF((float)x1, rect.Top) : new PointF(rect.Right, (float)y2));
}
}
else
{
if (border.Y >= center.Y)
{
TwoPoints.Add(x2 >= rect.Left ? new PointF((float)x2, rect.Bottom) : new PointF(rect.Left, (float)y1));
}
else
{
TwoPoints.Add(x1 >= rect.Left ? new PointF((float)x1, rect.Bottom) : new PointF(rect.Left, (float)y1));
}
}
}
if (TwoPoints.Count == 2)
{
g.Smooth(smooth);
g.DrawLine(pen, TwoPoints[0], TwoPoints[1]);
g.Smooth(false);
}
else
{
Console.WriteLine(TwoPoints.Count);
}
TwoPoints.Clear();
}