/// <summary>
/// calculates intersection to another rectangle
/// </summary>
/// <param name="rect">rectangle to check for intersection</param>
/// <returns>true if intersection exists</returns>
public bool IntersectsRectangle(Rectangle rect)
{
centerToCenter = rect.center - this.center;
//find nearest edge 1
dotVertical = GameVector.Dot(forward, centerToCenter);
dotHorisontal = GameVector.Dot(Right, centerToCenter);
if (Math.Abs(dotVertical) > Math.Abs(dotHorisontal))
{
nearestedgeIsVertical1 = true;
nearest1edgeIsPositive1 = dotVertical > 0;
nearest2edgeIsPositive1 = dotHorisontal > 0;
}
else
{
nearestedgeIsVertical1 = false;
nearest1edgeIsPositive1 = dotHorisontal > 0;
nearest2edgeIsPositive1 = dotVertical > 0;
}
//create nearest edge as line
if (nearestedgeIsVertical1)
{
if (nearest1edgeIsPositive1) nearestedge1 = new Line(forwardLeft, forwardRight);
else nearestedge1 = new Line(backLeft, backRight);
}
else
{
if (nearest1edgeIsPositive1) nearestedge1 = new Line(forwardRight, backRight);
else nearestedge1 = new Line(forwardLeft, backLeft);
}
// cut rect if it is fully on one side of this rectangle
Pt111CanItersect = nearestedge1.AreOnOneSide(center, rect.backLeft);
Pt121CanItersect = nearestedge1.AreOnOneSide(center, rect.backRight);
Pt131CanItersect = nearestedge1.AreOnOneSide(center, rect.forwardLeft);
Pt141CanItersect = nearestedge1.AreOnOneSide(center, rect.forwardRight);
if (!Pt111CanItersect && !Pt121CanItersect && !Pt131CanItersect && !Pt141CanItersect)
return false;
//find nearest edge2
dotVertical = -GameVector.Dot(rect.forward, centerToCenter);
dotHorisontal = -GameVector.Dot(rect.Right, centerToCenter);
if (Math.Abs(dotVertical) > Math.Abs(dotHorisontal))
{
nearestedgeIsVertical2 = true;
nearest1edgeIsPositive2 = dotVertical > 0;
nearest2edgeIsPositive2 = dotHorisontal > 0;
}
else
{
nearestedgeIsVertical2 = false;
nearest1edgeIsPositive2 = dotHorisontal > 0;
nearest2edgeIsPositive2 = dotVertical > 0;
}
//create nearest edge as line
if (nearestedgeIsVertical2)
{
if (nearest1edgeIsPositive2) nearestedge2 = new Line(rect.forwardLeft, rect.forwardRight);
else nearestedge2 = new Line(rect.backLeft, rect.backRight);
}
else
{
if (nearest1edgeIsPositive2) nearestedge2 = new Line(rect.forwardRight, rect.backRight);
else nearestedge2 = new Line(rect.forwardLeft, rect.backLeft);
}
// cut this rect if it is fully on one side of rect
Pt211CanItersect = nearestedge2.AreOnOneSide(rect.center, backLeft);
Pt221CanItersect = nearestedge2.AreOnOneSide(rect.center, backRight);
Pt231CanItersect = nearestedge2.AreOnOneSide(rect.center, forwardLeft);
Pt241CanItersect = nearestedge2.AreOnOneSide(rect.center, forwardRight);
if (!Pt211CanItersect && !Pt221CanItersect && !Pt231CanItersect && !Pt241CanItersect)
return false;
//form next nearest edge of this rectangle
if (!nearestedgeIsVertical1)
{
if (nearest2edgeIsPositive1) nearestedge1 = new Line(forwardLeft, forwardRight);
else nearestedge1 = new Line(backLeft, backRight);
}
else
{
if (nearest2edgeIsPositive1) nearestedge1 = new Line(forwardRight, backRight);
else nearestedge1 = new Line(forwardLeft, backLeft);
}
// cut rect if it is fully on one side of this rectangle
Pt112CanItersect = nearestedge1.AreOnOneSide(center, rect.backLeft);
Pt122CanItersect = nearestedge1.AreOnOneSide(center, rect.backRight);
Pt132CanItersect = nearestedge1.AreOnOneSide(center, rect.forwardLeft);
Pt142CanItersect = nearestedge1.AreOnOneSide(center, rect.forwardRight);
if (!Pt112CanItersect && !Pt122CanItersect && !Pt132CanItersect && !Pt142CanItersect)
return false;
//create next nearest edge as line
if (!nearestedgeIsVertical2)
{
if (nearest2edgeIsPositive2) nearestedge2 = new Line(rect.forwardLeft, rect.forwardRight);
else nearestedge2 = new Line(rect.backLeft, rect.backRight);
}
else
{
if (nearest2edgeIsPositive2) nearestedge2 = new Line(rect.forwardRight, rect.backRight);
else nearestedge2 = new Line(rect.forwardLeft, rect.backLeft);
}
// cut this rect if it is fully on one side of rect
Pt212CanItersect = nearestedge2.AreOnOneSide(rect.center, backLeft);
Pt222CanItersect = nearestedge2.AreOnOneSide(rect.center, backRight);
Pt232CanItersect = nearestedge2.AreOnOneSide(rect.center, forwardLeft);
Pt242CanItersect = nearestedge2.AreOnOneSide(rect.center, forwardRight);
if (!Pt212CanItersect && !Pt222CanItersect && !Pt232CanItersect && !Pt242CanItersect)
return false;
return ((Pt111CanItersect && Pt112CanItersect) ||
(Pt121CanItersect && Pt122CanItersect) ||
(Pt131CanItersect && Pt132CanItersect) ||
(Pt141CanItersect && Pt142CanItersect)
||
(Pt211CanItersect && Pt212CanItersect) ||
(Pt221CanItersect && Pt222CanItersect) ||
(Pt231CanItersect && Pt232CanItersect) ||
(Pt241CanItersect && Pt242CanItersect)
);
}
public void DrawLine(Line Line,MiniGameInterfaces.Color Color)
{
if (CRectanglesInBatch < MaxBatchSize / 2)
{
MiniGameInterfaces.Rectangle rect=new MiniGameInterfaces.Rectangle((Line.pt1+Line.pt2)*0.5f,
new GameVector(Line.Length(),0.003f*CameraPosition.Z),Line.pt2-Line.pt1);
DrawRectangle(rect, Color);
}
}
