/// <summary>
/// True if the point is to the right of the line.
/// </summary>
/// <param name="OtherPoint">The new point to test.</param>
public bool IsOnRight(C2DPoint OtherPoint)
{
return(C2DTriangle.GetAreaSigned(point, GetPointTo(), OtherPoint) < 0);
}
/// <summary>
/// Distance to a another.
/// </summary>
/// <param name="Other">The other triangle.</param>
/// <param name="ptOnThis">Output. The closest point on the triangle.</param>
/// <param name="ptOnOther">Output. The closest point on the other triangle.</param>
public double Distance(C2DTriangle Other, C2DPoint ptOnThis, C2DPoint ptOnOther)
{
C2DPoint ptTemp = new C2DPoint();
double dMinDist = Distance(Other.P1, ptOnThis);
ptOnOther.Set( Other.P1 );
double dDist = Distance(Other.P2, ptTemp);
if (dDist < dMinDist)
{
ptOnOther.Set(Other.P2);
ptOnThis.Set(ptTemp);
dMinDist = dDist;
}
dDist = Distance(Other.P3, ptTemp);
if (dDist < dMinDist)
{
ptOnOther.Set( Other.P3);
ptOnThis.Set(ptTemp);
dMinDist = dDist;
}
dDist = Other.Distance(P1, ptTemp);
if (dDist < dMinDist)
{
ptOnOther.Set(ptTemp);
ptOnThis.Set(P1);
dMinDist = dDist;
}
dDist = Other.Distance(P2, ptTemp);
if (dDist < dMinDist)
{
ptOnOther.Set(ptTemp);
ptOnThis.Set(P2);
dMinDist = dDist;
}
dDist = Other.Distance(P3, ptTemp);
if (dDist < dMinDist)
{
ptOnOther.Set(ptTemp);
ptOnThis.Set(P3);
dMinDist = dDist;
}
return dMinDist;
}
/// <summary>
/// Sets the circle to be the maximum contained circle within the triangle.
/// </summary>
/// <param name="Triangle">The triangle to bound the circle.</param>
public void SetInscribed(C2DTriangle Triangle)
{
C2DPoint InCen = Triangle.GetInCentre();
C2DLine Line = new C2DLine( Triangle.P1, Triangle.P2 );
C2DVector vec = new C2DVector(Line.point, InCen );
double dProj = vec.Dot(Line.vector);
double dLength = Line.vector.GetLength();
dProj /= dLength;
double dFactor = dProj / dLength;
C2DVector vProj = new C2DVector(Line.vector);
vProj.Multiply(dFactor);
C2DPoint ptOnLine = new C2DPoint(Line.point.x + vProj.i,Line.point.y + vProj.j) ;
Set(InCen, InCen.Distance( ptOnLine));
}
/// <summary>
/// Set to be circle that places all 3 points of the triangle on the edge.
/// </summary>
/// <param name="Triangle">The triangle.</param>
public bool SetCircumscribed(C2DTriangle Triangle)
{
if (Triangle.Collinear())
return false;
_Centre.Set(Triangle.GetCircumCentre());
Radius = _Centre.Distance(Triangle.P1);
return true;
}
/// <summary>
/// Draws a triangle filled.
/// </summary>
public void DrawFilled(C2DTriangle Triangle, Graphics graphics, Brush brush)
{
System.Drawing.Drawing2D.GraphicsPath gp = new System.Drawing.Drawing2D.GraphicsPath();
C2DPoint pt1 = new C2DPoint(Triangle.p1);
C2DPoint pt2 = new C2DPoint(Triangle.p2);
C2DPoint pt3 = new C2DPoint(Triangle.p3);
ScaleAndOffSet(pt1);
ScaleAndOffSet(pt2);
ScaleAndOffSet(pt3);
gp.AddLine((int)pt1.x, (int)pt1.y, (int)pt2.x, (int)pt2.y);
gp.AddLine((int)pt2.x, (int)pt2.y, (int)pt3.x, (int)pt3.y);
gp.AddLine((int)pt3.x, (int)pt3.y, (int)pt1.x, (int)pt1.y);
graphics.FillPath(brush, gp);
}
/// <summary>
/// Draws a triangle
/// </summary>
public void Draw(C2DTriangle Triangle, Graphics graphics, Pen pen)
{
Draw(new C2DLine( Triangle.p1, Triangle.p2), graphics, pen);
Draw(new C2DLine(Triangle.p2, Triangle.p3), graphics, pen);
Draw(new C2DLine( Triangle.p3, Triangle.p1), graphics, pen);
}
/// <summary>
/// Draws a triangle
/// </summary>
public void Draw(C2DTriangle Triangle, Graphics graphics, Pen pen)
{
Draw(new C2DLine(Triangle.p1, Triangle.p2), graphics, pen);
Draw(new C2DLine(Triangle.p2, Triangle.p3), graphics, pen);
Draw(new C2DLine(Triangle.p3, Triangle.p1), graphics, pen);
}
