/// <summary>
/// Scale a CollisionUnit by the given amount.
/// </summary>
/// <param name="unit">The CollisionUnit to scale.</param>
/// <param name="scale">The delta scale to perform on the CollisionUnit.</param>
public void ScaleCollisionUnit(CollisionUnit unit, Vector2 scale)
{
int oldCircleRadius;
int newCircleRadius;
Vector2 circleCenter;
Vector2 oldLineStart;
Vector2 oldLineEnd;
Point oldTopLeftCell;
Point oldBottomRightCell;
Point newTopLeftCell;
Point newBottomRightCell;
bool scaleFromCenter = false;
if (unit.GetCollisionType() == CollisionUnit.CollisionType.COLLISION_CIRCLE || unit.GetCollisionType() == CollisionUnit.CollisionType.COLLISION_BOX)
{
if (unit.GetCollisionType() == CollisionUnit.CollisionType.COLLISION_CIRCLE)
{
oldCircleRadius = unit.GetCircleRadius();
//newCircleRadius = (int)(unit.GetCircleRadius() * ((scale.X + scale.Y) / 2));
//newCircleRadius = (int)(unit.GetCircleRadius() + unit.GetCircleRadius() * ((scale.X + scale.Y) / 2));
newCircleRadius = (int)(unit.GetCircleRadius() + ((scale.X + scale.Y) / 2));
circleCenter = unit.GetCircleCenter();
// calculate containing cells
oldTopLeftCell = CalculateCircleTopLeftCell(circleCenter, oldCircleRadius);
oldBottomRightCell = CalculateCircleBottomRightCell(circleCenter, oldCircleRadius);
newTopLeftCell = CalculateCircleTopLeftCell(circleCenter, newCircleRadius);
newBottomRightCell = CalculateCircleBottomRightCell(circleCenter, newCircleRadius);
}
else
{
Vector2 point1 = unit.GetUpperLeft();
Vector2 point2 = unit.GetLowerRight();
int oldWidth = unit.GetWidth();
int oldHeight = unit.GetHeight();
//int xChange = (int)(((oldWidth * scale.X) - oldWidth) / 2);
//int yChange = (int)(((oldHeight * scale.Y) - oldHeight) / 2);
//int xChange = (int)(oldWidth * scale.X / 2);
//int yChange = (int)(oldHeight * scale.Y / 2);
int xChange = (int)scale.X;
int yChange = (int)scale.Y;
// scale from center
if (scaleFromCenter)
{
point1.X -= xChange;
point1.Y -= yChange;
point2.X += xChange;
point2.Y += yChange;
}
else
{
// scale with top left stationary
point2.X += xChange * 2;
point2.Y += yChange * 2;
}
oldTopLeftCell = CalculateCellPosition(unit.GetUpperLeft());
oldBottomRightCell = CalculateCellPosition(unit.GetLowerRight());
newTopLeftCell = CalculateCellPosition(point1);
newBottomRightCell = CalculateCellPosition(point2);
}
//if (scale.X < 1)
if (scale.X < 0)
{
for (int j = oldTopLeftCell.Y; j <= oldBottomRightCell.Y; j++)
{
// remove left
for (int i = oldTopLeftCell.X; i < newTopLeftCell.X; i++)
{
mCollisionGrid.Cells[i, j].RemoveCollisionUnit(unit);
}
// remove right
for (int i = newBottomRightCell.X + 1; i <= oldBottomRightCell.X; i++)
{
mCollisionGrid.Cells[i, j].RemoveCollisionUnit(unit);
}
}
//if (scale.Y < 1)
if (scale.Y < 0)
{
for (int i = newTopLeftCell.X; i <= newBottomRightCell.X; i++)
{
// remove top
for (int j = oldTopLeftCell.Y; j < newTopLeftCell.Y; j++)
{
mCollisionGrid.Cells[i, j].RemoveCollisionUnit(unit);
}
// remove bottom
for (int j = newBottomRightCell.Y + 1; j <= oldBottomRightCell.Y; j++)
{
mCollisionGrid.Cells[i, j].RemoveCollisionUnit(unit);
}
}
}
//else if (scale.Y > 1)
else if (scale.Y > 0)
{
for (int i = newTopLeftCell.X; i <= newBottomRightCell.X; i++)
{
// add top
for (int j = newTopLeftCell.Y; j < oldTopLeftCell.Y; j++)
{
mCollisionGrid.Cells[i, j].AddCollisionUnit(unit);
}
// add bottom
for (int j = oldBottomRightCell.Y + 1; j <= newBottomRightCell.Y; j++)
{
mCollisionGrid.Cells[i, j].AddCollisionUnit(unit);
}
}
}
}
//else if (scale.X > 1)
else if (scale.X > 0)
{
for (int j = newTopLeftCell.Y; j <= newBottomRightCell.Y; j++)
{
// add left
for (int i = newTopLeftCell.X; i < oldTopLeftCell.X; i++)
{
mCollisionGrid.Cells[i, j].AddCollisionUnit(unit);
}
// add right
for (int i = oldBottomRightCell.X + 1; i <= newBottomRightCell.X; i++)
{
mCollisionGrid.Cells[i, j].AddCollisionUnit(unit);
}
}
//if (scale.Y < 1)
if (scale.Y < 0)
{
for (int i = oldTopLeftCell.X; i <= oldBottomRightCell.X; i++)
{
// remove top
for (int j = oldTopLeftCell.Y; j < newTopLeftCell.Y; j++)
{
mCollisionGrid.Cells[i, j].RemoveCollisionUnit(unit);
}
// remove bottom
for (int j = newBottomRightCell.Y + 1; j <= oldBottomRightCell.Y; j++)
{
mCollisionGrid.Cells[i, j].RemoveCollisionUnit(unit);
}
}
}
//else if (scale.Y > 1)
else if (scale.Y > 0)
{
for (int i = oldTopLeftCell.X; i <= oldBottomRightCell.X; i++)
{
// add top
for (int j = newTopLeftCell.Y; j < oldTopLeftCell.Y; j++)
{
mCollisionGrid.Cells[i, j].AddCollisionUnit(unit);
}
// add bottom
for (int j = oldBottomRightCell.Y + 1; j <= newBottomRightCell.Y; j++)
{
mCollisionGrid.Cells[i, j].AddCollisionUnit(unit);
}
}
}
}
}
else if (unit.GetCollisionType() == CollisionUnit.CollisionType.COLLISION_LINE)
{
oldLineStart = unit.GetLineStart();
oldLineEnd = unit.GetLineEnd();
// TODO: put in appropriate cells
}
}
