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namespace MediaBrowser.Model.Drawing
{
/// <summary>
/// Class DrawingUtils
/// </summary>
public static class DrawingUtils
{
/// <summary>
/// Resizes a set of dimensions
/// </summary>
/// <param name="size">The original size object</param>
/// <param name="width">A new fixed width, if desired</param>
/// <param name="height">A new fixed height, if desired</param>
/// <param name="maxWidth">A max fixed width, if desired</param>
/// <param name="maxHeight">A max fixed height, if desired</param>
/// <returns>A new size object</returns>
public static ImageSize Resize(ImageSize size,
double width,
double height,
double maxWidth,
double maxHeight)
{
double newWidth = size.Width;
double newHeight = size.Height;
if (width > 0 && height > 0)
{
newWidth = width;
newHeight = height;
}
else if (height > 0)
{
newWidth = GetNewWidth(newHeight, newWidth, height);
newHeight = height;
}
else if (width > 0)
{
newHeight = GetNewHeight(newHeight, newWidth, width);
newWidth = width;
}
if (maxHeight > 0 && maxHeight < newHeight)
{
newWidth = GetNewWidth(newHeight, newWidth, maxHeight);
newHeight = maxHeight;
}
if (maxWidth > 0 && maxWidth < newWidth)
{
newHeight = GetNewHeight(newHeight, newWidth, maxWidth);
newWidth = maxWidth;
}
return new ImageSize { Width = newWidth, Height = newHeight };
}
/// <summary>
/// Gets the new width.
/// </summary>
/// <param name="currentHeight">Height of the current.</param>
/// <param name="currentWidth">Width of the current.</param>
/// <param name="newHeight">The new height.</param>
/// <returns>System.Double.</returns>
private static double GetNewWidth(double currentHeight, double currentWidth, double newHeight)
{
double scaleFactor = newHeight;
scaleFactor /= currentHeight;
scaleFactor *= currentWidth;
return scaleFactor;
}
/// <summary>
/// Gets the new height.
/// </summary>
/// <param name="currentHeight">Height of the current.</param>
/// <param name="currentWidth">Width of the current.</param>
/// <param name="newWidth">The new width.</param>
/// <returns>System.Double.</returns>
private static double GetNewHeight(double currentHeight, double currentWidth, double newWidth)
{
double scaleFactor = newWidth;
scaleFactor /= currentWidth;
scaleFactor *= currentHeight;
return scaleFactor;
}
}
}
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