internal static bool CollidePolygonLine(ICollidible polyCollidible, CollisionTypePolygon cTypePoly, CollisionTypeLine cTypeLine)
{
// for performance reasons first check the bounding box
if (CollideBoundingBoxLine(polyCollidible, cTypeLine))
{
// transform the polygon to match the positioning, rotation and scale of the node
Polygon transformedPolygon = ((Polygon)cTypePoly.collisionPolygon.Clone());
transformedPolygon.TransformAccordingToGameObject(polyCollidible);
// first check if the polygon contains some of the two line points
if (transformedPolygon.ContainsPoint(cTypeLine.StartPoint) || transformedPolygon.ContainsPoint(cTypeLine.EndPoint))
{
return(true);
}
// solve exactly: check for line intersections
var polyPoints = transformedPolygon.Points;
int i, j;
for (i = 0, j = polyPoints.Length - 1; i < polyPoints.Length; j = i++)
{
if (CCPoint.SegmentIntersect(cTypeLine.StartPoint, cTypeLine.EndPoint, polyPoints[i], polyPoints[j]))
{
return(true);
}
}
}
return(false);
}
// dirty
internal static bool CollidePolygonPolygon(ICollidible polyCollidible1, CollisionTypePolygon cTypePoly1, ICollidible polyCollidible2, CollisionTypePolygon cTypePoly2)
{
// first check the bounding boxes of the polygons (for performance)
if (((CCNode)polyCollidible1).BoundingBoxTransformedToWorld.IntersectsRect(((CCNode)polyCollidible2).BoundingBoxTransformedToWorld))
{
// transform the polygon to match the positioning, rotation and scale of the node
Polygon transformedPolygon1 = ((Polygon)cTypePoly1.collisionPolygon.Clone());
transformedPolygon1.TransformAccordingToGameObject(polyCollidible1);
Polygon transformedPolygon2 = ((Polygon)cTypePoly2.collisionPolygon.Clone());
transformedPolygon2.TransformAccordingToGameObject(polyCollidible2);
foreach (var point in transformedPolygon1.Points)
{
if (transformedPolygon2.ContainsPoint(point))
{
return(true);
}
}
}
return(false);
}
// dirty as it only checks whether one contains a point of the other
internal static bool CollideBoundingBoxPolygon(ICollidible boxCollidible, ICollidible polyCollidible, CollisionTypePolygon cTypePoly)
{
// first check the bounding box of the polygon (for performance)
CCRect box = ((CCNode)boxCollidible).BoundingBoxTransformedToWorld;
if (box.IntersectsRect(((CCNode)polyCollidible).BoundingBoxTransformedToWorld))
{
CCPoint[] boxPoints = Constants.CCRectPoints(box);
// transform the polygon to match the positioning, rotation and scale of the node
Polygon transformedPolygon = ((Polygon)cTypePoly.collisionPolygon.Clone());
transformedPolygon.TransformAccordingToGameObject(polyCollidible);
foreach (var point in boxPoints)
{
if (transformedPolygon.ContainsPoint(point))
{
return(true);
}
}
foreach (var point in transformedPolygon.Points)
{
if (box.ContainsPoint(point))
{
return(true);
}
}
}
return(false);
}
// is dirty, as it only checks whether polygon points are contained in the circle, not whether polygon lines are crossed by it
internal static bool CollideCirclePolygon(ICollidible circleCollidible, CollisionTypeCircle cTypeCircle, ICollidible polyCollidible, CollisionTypePolygon cTypePoly)
{
float radius = CorrectRadius(circleCollidible, cTypeCircle);
CCPoint pos = ((CCNode)circleCollidible).PositionWorldspace;
// transform the polygon to match the positioning, rotation and scale of the node
Polygon transformedPolygon = ((Polygon)cTypePoly.collisionPolygon.Clone());
transformedPolygon.TransformAccordingToGameObject(polyCollidible);
// for each point of the polygon check whether its contained in the circle
foreach (var point in transformedPolygon.Points)
{
if (point.IsNear(pos, radius))
{
return(true);
}
}
return(false);
}
internal static bool CollidePositionPolygon(ICollidible posCollidible, ICollidible polyCollidible, CollisionTypePolygon cTypePoly)
{
// first check for bounding box collision (for efficience)
if (CollidePositionBoundingBox(posCollidible, polyCollidible))
{
// transform the polygon to match the positioning, rotation and scale of the node
Polygon transformedPolygon = ((Polygon)cTypePoly.collisionPolygon.Clone());
transformedPolygon.TransformAccordingToGameObject(polyCollidible);
return(transformedPolygon.ContainsPoint(((CCNode)posCollidible).PositionWorldspace));
}
return(false);
}
