public static PaddedBox Pad(
Size source,
Size bounds,
CropAnchor anchor = CropAnchor.Center,
bool upscale = false)
{
var size = Fit(source, bounds, upscale); // Fit if it doesn't fit or needs upscaling...
// Distribute the padding
var extraWidth = bounds.Width - size.Width;
var extraHeight = bounds.Height - size.Height;
int top = extraHeight / 2,
right = extraWidth / 2,
bottom = extraHeight / 2,
left = extraWidth / 2;
if (anchor.HasFlag(CropAnchor.Left))
{
right = extraWidth;
left = 0;
}
else if (anchor.HasFlag(CropAnchor.Right))
{
left = extraWidth;
right = 0;
}
else
{
// If we split on a pixel, add 1px to the left
if (extraWidth % 2 == 1)
{
left += 1;
}
}
if (anchor.HasFlag(CropAnchor.Top))
{
bottom = extraHeight;
top = 0;
}
else if (anchor.HasFlag(CropAnchor.Bottom))
{
top = extraHeight;
bottom = 0;
}
else
{
// If we split on a pixel, add 1px to the top
if (extraHeight % 2 == 1)
{
top += 1;
}
}
var padding = new Padding(top, right, bottom, left);
return(new PaddedBox(size, padding));
}
// Align the box within the bounds
public static void Align(ref Rectangle box, Size bounds, CropAnchor anchor)
{
double x = 0d,
y = 0d;
// There's horizontal space
if (box.Width < bounds.Width)
{
if (anchor.HasFlag(CropAnchor.Left))
{
x = 0;
}
else if (anchor.HasFlag(CropAnchor.Right))
{
x = bounds.Width - box.Width;
}
else // center
{
x = (bounds.Width - box.Width) / 2d;
}
}
// There's vertical space
if (box.Height < bounds.Height)
{
if (anchor.HasFlag(CropAnchor.Top))
{
y = 0;
}
else if (anchor.HasFlag(CropAnchor.Bottom))
{
y = bounds.Height - box.Height;
}
else // Center
{
y = (bounds.Height - box.Height) / 2d;
}
}
box.X = (int)x;
box.Y = (int)y;
}
// source is ALWAYS bigger than bounds
private static Rectangle CalculateCropRectangle(Size source, Size target, CropAnchor anchor)
{
int x = 0,
y = 0;
// There's veritical space to distribute
if (source.Height > target.Height)
{
if (anchor.HasFlag(CropAnchor.Top))
{
y = 0;
}
else if (anchor.HasFlag(CropAnchor.Bottom))
{
y = source.Height - target.Height;
}
else // Center
{
y = (int)((source.Height - target.Height) / 2d);
}
}
// There's horizontal space to distribute
if (source.Width > target.Width)
{
if (anchor.HasFlag(CropAnchor.Left))
{
x = 0;
}
else if (anchor.HasFlag(CropAnchor.Right))
{
x = source.Width - target.Width;
}
else // center
{
x = (int)((source.Width - target.Width) / 2d);
}
}
return(new Rectangle(x, y, target.Width, target.Height));
}