/// <summary>
/// Scale the widths given in the column specification to split up the specified full width as evenly as possible
/// </summary>
/// <exception cref="System.ArgumentOutOfRangeException">Thrown if the width is smaller than the number of columns</exception>
public static int[] ScaleColumnWidths(int fullWidth, ColumnFormat[] columnFormats)
{
fullWidth = Math.Abs(fullWidth);
// Two small to fit anything in
if (fullWidth < columnFormats.Length)
{
throw new ArgumentOutOfRangeException("fullWidth");
}
int[] specifiedWidths = columnFormats.Select(c => c.Width).ToArray();
return(ColumnFormat.ScaleWidths(fullWidth, specifiedWidths));
}
private static int[] ScaleWidths(int fullWidth, int[] widths)
{
int[] columnWidths = new int[widths.Length];
int remainingWidth = fullWidth;
int fractionalWidths = 0;
// Add up the specified widths
for (int i = 0; i < columnWidths.Length; i++)
{
fractionalWidths += (columnWidths[i] = widths[i]);
}
// Scale up to whole numbers, adding any remainder
bool zeroSpace = false;
double widthMultiplier = (double)fullWidth / fractionalWidths;
for (int i = 0; i < columnWidths.Length; i++)
{
int scaledWidth = (int)(columnWidths[i] * widthMultiplier);
if (scaledWidth == 0)
{
zeroSpace = true;
columnWidths[i] = 1;
}
else
{
columnWidths[i] = scaledWidth;
}
remainingWidth -= columnWidths[i];
}
if (remainingWidth > 0)
{
columnWidths[columnWidths.Length - 1] += remainingWidth;
}
if (zeroSpace)
{
// Recursing should continue to drop us down to a truer fit
return(ColumnFormat.ScaleWidths(fullWidth, columnWidths));
}
else
{
return(columnWidths);
}
}
