/// <summary>
/// Adjusts offsets of graphic object.
/// </summary>
/// <param name="graphicObject">Graphic object to process</param>
/// <param name="dx">Displacement along the x-axis</param>
/// <param name="dy">Displacement along the y-axis</param>
/// <param name="resDx">Resulting displacement along the x-axis</param>
/// <param name="resDy">Resulting displacement along the y-axis</param>
public void AdjustOffsets(IGraphicObject graphicObject, int dx, int dy, out int resDx, out int resDy)
{
if (graphicObject == null)
{
throw new ArgumentNullException(nameof(graphicObject));
}
var boundRect = graphicObject.GetBoundRectangle();
boundRect.Offset(dx, dy);
if (dx < 0)
{
resDx = boundRect.Left < 0 ? dx - boundRect.Left : dx;
}
else
{
resDx = boundRect.Right > Width ? dx - (boundRect.Right - Width) : dx;
}
if (dy < 0)
{
resDy = boundRect.Top < 0 ? dy - boundRect.Top : dy;
}
else
{
resDy = boundRect.Bottom > Height ? dy - (boundRect.Bottom - Height) : dy;
}
}
/// <summary>
/// Some sort of optimization. Checks if current graphic object is covered by selected one.
/// </summary>
/// <param name="graphicObject">Object for check</param>
/// <returns>Return true if current graphic object is covered by selected on otherwise - false</returns>
private bool IsCoverBySelectedObject(IGraphicObject graphicObject)
{
lock (_selectedObjectLock)
{
if (_selectedGraphicObject == null ||
graphicObject == _selectedGraphicObject)
{
return false;
}
var selectedBoundRect = _selectedGraphicObject.GetBoundRectangle();
var boundRect = graphicObject.GetBoundRectangle();
var union = Rectangle.Union(selectedBoundRect, boundRect);
if (union == selectedBoundRect)
{
return true;
}
return false;
}
}
