/// <summary>
/// Return a position that is both on the line and in the polygon.
/// </summary>
/// <param name="testProjectile"></param>
/// <param name="part"></param>
/// <returns></returns>
internal static CCPoint CollisionPosLinePoly(CollisionTypeLine cTypeLine, ICollidible polyCollidible)
{
// for performance reasons first check the bounding box (skip for now because we assume a collision is present
if (CollideBoundingBoxLine(polyCollidible, cTypeLine))
{
// transform the polygon to match the positioning, rotation and scale of the node
Polygon transformedPolygon = ((Polygon)((CollisionTypePolygon)polyCollidible.CollisionType).collisionPolygon.Clone());
transformedPolygon.TransformAccordingToGameObject(polyCollidible);
// first check if the polygon contains some of the two line points
if (transformedPolygon.ContainsPoint(cTypeLine.StartPoint))
{
return(cTypeLine.StartPoint);
}
else if (transformedPolygon.ContainsPoint(cTypeLine.EndPoint))
{
return(cTypeLine.EndPoint);
}
// 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(CCPoint.IntersectPoint(cTypeLine.StartPoint, cTypeLine.EndPoint, polyPoints[i], polyPoints[j]));
}
}
}
return(CCPoint.Zero);
}
internal static bool CollideLineLineAt(CCPoint start1, CCPoint end1, CCPoint start2, CCPoint end2, out float cX, out float cY)
{
var point = CCPoint.IntersectPoint(start1, end1, start2, end2);
cX = point.X; cY = point.Y;
if (CCPoint.SegmentIntersect(start1, end1, start2, end2))
{
return(true);
}
return(false);
}
private EnemyBullet AddEnemyBullet(CCSprite sender)
{
EnemyBullet bullet = new EnemyBullet();
bullet.Position = new CCPoint(sender.Position.X, sender.Position.Y - sender.ContentSize.Height / 2);
AddChild(bullet, ENEMY_BULLET_INDEX);
CCPoint target = CCPoint.IntersectPoint(bullet.Position, player.Position, CCPoint.Zero, new CCPoint(VisibleBoundsWorldspace.MaxX, 0));
float distance = CCPoint.Distance(bullet.Position, target);
var moveBullet = new CCMoveTo(distance / ENEMY_BULLET_SPEED, target);
bullet.RunActions(moveBullet, moveOutOfView);
return(bullet);
}