/// <summary>
/// Inflates the rectangle by specified width and height (can be negative) and automatically clamps rectangle coordinates.
/// </summary>
/// <param name="rect">Rectangle to inflate.</param>
/// <param name="width">Horizontal amount.</param>
/// <param name="height">Vertical amount.</param>
/// <param name="constrainedArea">If specified rectangle region will be clamped.</param>
/// <returns>Inflated rectangle.</returns>
public static Rectangle Inflate(this Rectangle rect, int width, int height, Size constrainedArea = default(Size))
{
Rectangle newRect = new Rectangle
{
X = rect.X - width,
Y = rect.Y - height,
Width = rect.Width + 2 * width,
Height = rect.Height + 2 * height
};
if (constrainedArea.IsEmpty == false)
newRect.Intersect(new Rectangle(new Point(), constrainedArea));
return newRect;
}
/// <summary>
/// Inflates the rectangle by specified width and height (can be negative) and automatically clamps rectangle coordinates.
/// </summary>
/// <param name="rect">Rectangle to inflate.</param>
/// <param name="widthScale">Horizontal scale.</param>
/// <param name="heightScale">Vertical scale.</param>
/// <param name="constrainedArea">If specified rectangle region will be clamped.</param>
/// <returns>Inflated rectangle.</returns>
public static Rectangle Inflate(this Rectangle rect, double widthScale, double heightScale, Size constrainedArea = default(Size))
{
Rectangle newRect = new Rectangle
{
X = (int)(rect.X - rect.Width * widthScale / 2),
Y = (int)(rect.Y - rect.Height * heightScale / 2),
Width = (int)(rect.Width + rect.Width * widthScale),
Height = (int)(rect.Height + rect.Height * heightScale)
};
if (constrainedArea.IsEmpty == false)
newRect.Intersect(new Rectangle(new Point(), constrainedArea));
return newRect;
}
/// <summary>
/// Calculates intersected rectangle from specified area (transformed into rectangle with location (0,0))
/// which can be useful for image area intersections.
/// </summary>
/// <param name="rect">Rectangle to intersect.</param>
/// <param name="area">Maximum bounding box represented as size.</param>
/// <param name="preserveScale">
/// If true the size components will be cropped by equal amount.
/// If false the size ratio will not be checked.
/// </param>
/// <returns>Intersected rectangle.</returns>
public static Rectangle Intersect(this Rectangle rect, Size area, bool preserveScale = false)
{
Rectangle newRect = rect.Intersect(new Rectangle(0, 0, area.Width, area.Height), preserveScale);
return(newRect);
}
