public CollisionDirection CheckCollision(PhysicsAble entity)
{
Entity e = this;
Vector2 position = entity.GetPhysicsPosition() + entity.GetPhysicsVelocity();
Vector2 entitySize = entity.GetPhysicsSize();
if (entitySize == Vector2.Zero)
{
return CollisionDirection.NONE;
}
int half_x_bounds = (int)entitySize.X / 2;
int half_y_bounds = (int)entitySize.Y / 2;
Rectangle checkingBounds = new Rectangle((int)position.X - half_x_bounds, (int)position.Y - half_y_bounds, (int)entitySize.X, (int)entitySize.Y);
bool left = leftRect.Intersects(checkingBounds);
bool right = rightRect.Intersects(checkingBounds);
bool top = topRect.Intersects(checkingBounds);
bool bottom = bottomRect.Intersects(checkingBounds);
if (left && top)
{
return CollisionDirection.TOPLEFT;
}
else if (right && top)
{
return CollisionDirection.BOTTOMRIGHT;
}
else if (bottom && right)
{
return CollisionDirection.BOTTOMRIGHT;
}
else if (bottom && left)
{
return CollisionDirection.BOTTOMLEFT;
}
else if (top)
{
return CollisionDirection.TOP;
}
else if (bottom)
{
return CollisionDirection.BOTTOM;
}
else if (left)
{
return CollisionDirection.LEFT;
}
else if (right)
{
return CollisionDirection.RIGHT;
}
else
{
return CollisionDirection.NONE;
}
}
public CollisionDirection CheckCollision(PhysicsAble entity)
{
// Assuming for now position and bounds defined in pixel space, this should be easy to switch out if needed
Vector2 position = entity.GetPhysicsPosition() + entity.GetPhysicsVelocity();
Vector2 size = entity.GetPhysicsSize();
float half_scaled_bg_w = levelSize.X / 2;
float half_scaled_bg_h = levelSize.Y / 2;
Vector2 levelPosition = this.worldPosition - new Vector2(half_scaled_bg_w, half_scaled_bg_h);
Vector2 characterInLevel = position - levelPosition;
// Define region of pixels under the bounds
int left = Math.Max(0, (int)Math.Floor((characterInLevel.X - size.X / 2) / levelSize.X * bitmapWidth));
int width = (int)Math.Ceiling(size.X / levelSize.X * bitmapWidth);
int top = Math.Max(0, (int)Math.Floor((characterInLevel.Y - size.Y / 2) / levelSize.Y * bitmapHeight));
int height = (int)Math.Ceiling(size.Y / levelSize.Y * bitmapHeight);
bool hitTop = false;
bool hitLeft = false;
bool hitRight = false;
bool hitBottom = false;
for (int x = left; x < left + width; x++)
{
for (int y = top; y < top + height; y++)
{
int index = y * bitmapWidth + x;
// TODO: shouldn't get too far ahead of myself
if (index < bitmap.Length && bitmap[index])
{
if (x - left <= width / 2) hitLeft = true;
if (x - left >= width / 2) hitRight = true;
if (y - top <= height / 2) hitTop = true;
if (y - top >= height / 2) hitBottom = true;
}
// Possible: delete if out of bounds
}
}
if (hitLeft && hitTop)
{
return CollisionDirection.TOPLEFT;
}
else if (hitRight && hitTop)
{
return CollisionDirection.BOTTOMRIGHT;
}
else if (hitBottom && hitRight)
{
return CollisionDirection.BOTTOMRIGHT;
}
else if (hitBottom && hitLeft)
{
return CollisionDirection.BOTTOMLEFT;
}
else if (hitTop)
{
return CollisionDirection.TOP;
}
else if (hitBottom)
{
return CollisionDirection.BOTTOM;
}
else if (hitLeft)
{
return CollisionDirection.LEFT;
}
else if (hitRight)
{
return CollisionDirection.RIGHT;
}
else
{
return CollisionDirection.NONE;
}
}