public MatrixAccessor(int width, int height, CoordinateOrder2D order, bool zeroIndexed = true)
{
this.width = width;
this.height = height;
this.order = order;
this.zeroIndexed = zeroIndexed;
}
// Returns the array's start index based on the given coordinate order.
// This is equivalent to getting the index at zero-based (0, 0).
private int GetStartIndex(CoordinateOrder2D coordinateOrder)
{
int offset1 = GetStartOffsetFromDirection(coordinateOrder.GetDirectionFirst());
int offset2 = GetStartOffsetFromDirection(coordinateOrder.GetDirectionSecond());
return(offset1 + offset2);
}
public static CoordinateOrder2D Rotate180(this CoordinateOrder2D e)
{
switch (e)
{
default:
case CoordinateOrder2D.RightThenDown:
return(CoordinateOrder2D.LeftThenUp);
case CoordinateOrder2D.RightThenUp:
return(CoordinateOrder2D.LeftThenDown);
case CoordinateOrder2D.LeftThenDown:
return(CoordinateOrder2D.RightThenUp);
case CoordinateOrder2D.LeftThenUp:
return(CoordinateOrder2D.RightThenDown);
case CoordinateOrder2D.UpThenRight:
return(CoordinateOrder2D.DownThenLeft);
case CoordinateOrder2D.UpThenLeft:
return(CoordinateOrder2D.DownThenRight);
case CoordinateOrder2D.DownThenRight:
return(CoordinateOrder2D.UpThenLeft);
case CoordinateOrder2D.DownThenLeft:
return(CoordinateOrder2D.UpThenRight);
}
}
public static Direction2D GetDirectionVertical(this CoordinateOrder2D e)
{
switch (e)
{
default:
case CoordinateOrder2D.UpThenRight:
case CoordinateOrder2D.UpThenLeft:
case CoordinateOrder2D.RightThenUp:
case CoordinateOrder2D.LeftThenUp:
return(Direction2D.Up);
case CoordinateOrder2D.DownThenRight:
case CoordinateOrder2D.DownThenLeft:
case CoordinateOrder2D.RightThenDown:
case CoordinateOrder2D.LeftThenDown:
return(Direction2D.Down);
}
}
// Returns the array's end index based on the given coordinate order.
// This is equivalent to getting the index at zero-based (width-1, height-1).
private int GetEndIndex(CoordinateOrder2D coordinateOrder)
{
return(GetStartIndex(coordinateOrder.Rotate180()));
}
