public static int PointOnWhichSideOfLineSegment(Point linePoint1, Point linePoint2, Point point)
{
Point lineVec = PointUtil.Minus(linePoint2, linePoint1);
Point pointVec = PointUtil.Minus(point, linePoint1);
float dot = PointUtil.Dot(pointVec, lineVec);
//point is on side of linePoint2, compared to linePoint1
if (dot > 0)
{
//point is on the line segment
if (PointUtil.Magnitude(pointVec) <= PointUtil.Magnitude(lineVec))
{
return(0);
}
//point is not on the line segment and it is on the side of linePoint2
else
{
return(2);
}
}
//Point is not on side of linePoint2, compared to linePoint1.
//Point is not on the line segment and it is on the side of linePoint1.
else
{
return(1);
}
}
public static Point ProjectPointOnLineSegment(Point linePoint1, Point linePoint2, Point point)
{
Point vector = PointUtil.Minus(linePoint2, linePoint1);
Point projectedPoint = ProjectPointOnLine(linePoint1, PointUtil.Normalize(vector), point);
int side = PointOnWhichSideOfLineSegment(linePoint1, linePoint2, projectedPoint);
//The projected point is on the line segment
if (side == 0)
{
return(projectedPoint);
}
if (side == 1)
{
return(linePoint1);
}
if (side == 2)
{
return(linePoint2);
}
//output is invalid
return(Point.Empty);
}
public void GenBlock()
{
ClearBlock();
Document a = canvas1.GetCurrent();
a.GetLinesOfRoom();
foreach (Line line in a.lines)
{
UCWall temp = new UCWall();
canvas1.Controls.Add(temp);
Size tSize = new Size(PointUtil.Minus(line.pB, line.pA));
if (tSize.Width == 0)
{
temp.isVertical = true;
temp.Location = PointUtil.Plus(line.pA, new Point(-2, 2));
tSize.Width = 5;
tSize.Height -= 2;
}
else
{
temp.isVertical = false;
temp.Location = PointUtil.Plus(line.pA, new Point(2, -2));
tSize.Height = 5;
tSize.Width -= 2;
}
temp.Size = tSize;
canvas1.Controls.SetChildIndex(temp, 0);
//Console.WriteLine("draw loc :" + temp.Location + "size : " + temp.Size);
}
}
public static Point ProjectPointOnLine(Point linePoint, Point lineVec, Point point)
{
//get vector from point on line to point in space
Point linePointToPoint = PointUtil.Minus(point, linePoint);
int t = PointUtil.Dot(linePointToPoint, lineVec);
return(PointUtil.Plus(linePoint, new Point(lineVec.X * t, lineVec.Y * t)));
}