protected override CollisionResult ContactWithRectangle(ConvexRect otherRect)
{
bool collision = true;
//this rectangle's normal of 4 corner and use it as projection axis
Vector2[] rect1Normals = this.Normals;
Vector2[] rect1AllCorners = this.AllCorners;
Vector2[] rect2AllCorners = otherRect.AllCorners;
//For each normals in this rectangle
for (int i = 0; i < rect1Normals.Length; i++)
{
//Projecting all corners from rect1 to rect1's normal
float r1Dot1 = Vector2.Dot(rect1Normals [i], rect1AllCorners [0]);
float r1Dot2 = Vector2.Dot(rect1Normals [i], rect1AllCorners [1]);
float r1Dot3 = Vector2.Dot(rect1Normals [i], rect1AllCorners [2]);
float r1Dot4 = Vector2.Dot(rect1Normals [i], rect1AllCorners [3]);
//Find rect1 max and min projection
float r1PMin = Mathf.Min(r1Dot1, Mathf.Min(r1Dot2, Mathf.Min(r1Dot3, r1Dot4)));
float r1PMax = Mathf.Max(r1Dot1, Mathf.Max(r1Dot2, Mathf.Max(r1Dot3, r1Dot4)));
//Projecting all corners from rect2 to rect1's normal
float r2Dot1 = Vector2.Dot(rect1Normals [i], rect2AllCorners [0]);
float r2Dot2 = Vector2.Dot(rect1Normals [i], rect2AllCorners [1]);
float r2Dot3 = Vector2.Dot(rect1Normals [i], rect2AllCorners [2]);
float r2Dot4 = Vector2.Dot(rect1Normals [i], rect2AllCorners [3]);
//Find rect2 max and min projection
float r2PMin = Mathf.Min(r2Dot1, Mathf.Min(r2Dot2, Mathf.Min(r2Dot3, r2Dot4)));
float r2PMax = Mathf.Max(r2Dot1, Mathf.Max(r2Dot2, Mathf.Max(r2Dot3, r2Dot4)));
//Two rectangles not collide each other if there is a gap
//and we do not check further
if (r2PMin > r1PMax || r2PMax < r1PMin)
{
collision = false;
break;
}
}
//Check if this rectangle is inside another rectangle
if (collision == true)
{
bool inside = true;
//4 corners of this rectangle
foreach (Vector2 corner in AllCorners)
{
//if other rectangle not contain this corner
if (!otherRect.ContainPoint2D(corner))
{
inside = false;
break;
}
}
if (inside == true)
{
return(CollisionResult.Fit);
}
return(CollisionResult.Overlap);
}
//There is no collision between two rectangles;
return(CollisionResult.None);
}