/// <summary>
/// Checks for collisions, stores them in the stack
/// and returns a boolean
/// </summary>
/// <param name="subject"></param>
/// <param name="movingObjectArray"></param>
/// <param name="stack"></param>
/// <returns></returns>
public static bool CollisionHappened(MovingObject subject, ArrayList movingObjectArray, Stack stack)
{
Vector2 subjectOrigin = subject.GetOrigin();
Vector2 subjectPosition = subject.GetPosition();
Texture2D subjectTexture = subject.GetTexture();
float _scale = GameLogic.GetInstance().GetScale();
_subjectTextureData =
new Color[subjectTexture.Width * subjectTexture.Height];
subjectTexture.GetData(_subjectTextureData);
// Update the subject's transform
Matrix subjectTransform =
Matrix.CreateTranslation(new Vector3(-subjectOrigin, 0.0f)) *
Matrix.CreateScale(_scale) *
Matrix.CreateTranslation(new Vector3(subjectPosition, 0.0f));
// Get the bounding rectangle of the subject
Rectangle subjectRectangle = CalculateBoundingRectangle(
new Rectangle(0, 0,
subjectTexture.Width, subjectTexture.Height), subjectTransform);
bool collision = false;
for (int i = movingObjectArray.Count - 1; i >= 0; i--)
{
MovingObject movingObject = (MovingObject)movingObjectArray[i];
Vector2 movingObjectOrigin = movingObject.GetOrigin();
Vector2 movingObjectPosition = movingObject.GetPosition();
Texture2D movingObjectTexture = movingObject.GetTexture();
_movingObjectTextureData =
new Color[movingObjectTexture.Width * movingObjectTexture.Height];
movingObjectTexture.GetData(_movingObjectTextureData);
// Build the movingObject's transform
Matrix movingObjectTransform =
Matrix.CreateTranslation(new Vector3(-movingObjectOrigin, 0.0f)) *
Matrix.CreateScale(_scale) *
// Matrix.CreateRotationZ(movingObjectRotation) *
Matrix.CreateTranslation(new Vector3(movingObjectPosition, 0.0f));
// Calculate the bounding rectangle of this movingObject in world space
Rectangle movingObjectRectangle = CalculateBoundingRectangle(
new Rectangle(0, 0, movingObjectTexture.Width, movingObjectTexture.Height),
movingObjectTransform);
// The per-pixel check is expensive, so check the bounding rectangles
// first to prevent testing pixels when collisions are impossible.
if (subjectRectangle.Intersects(movingObjectRectangle) || subjectRectangle.Contains(movingObjectRectangle))
{
// Check collision with person
if (IntersectPixels(subjectTransform, subjectTexture.Width,
subjectTexture.Height, _subjectTextureData,
movingObjectTransform, movingObjectTexture.Width,
movingObjectTexture.Height, _movingObjectTextureData))
{
collision = true;
stack.Push(movingObject);
}
}
}
return collision;
}
/// <summary>
/// Returns a unit vector of the direction from
/// subject to target
/// </summary>
/// <param name="subject"></param>
/// <param name="target"></param>
/// <returns></returns>
public static Vector2 PointToTarget(MovingObject subject, MovingObject target)
{
Vector2 v = target.GetPosition() - subject.GetPosition();
v.Normalize();
return v;
}
