private static Rect GetMaskDestRect(SvgMaskElement maskElement, Rect bounds)
{
Rect result = new Rect(0, 0, 0, 0);
result.X = CalcPatternUnit(maskElement, maskElement.X.AnimVal as SvgLength,
SvgLengthDirection.Horizontal, bounds);
result.Y = CalcPatternUnit(maskElement, maskElement.Y.AnimVal as SvgLength,
SvgLengthDirection.Vertical, bounds);
result.Width = CalcPatternUnit(maskElement, maskElement.Width.AnimVal as SvgLength,
SvgLengthDirection.Horizontal, bounds);
result.Height = CalcPatternUnit(maskElement, maskElement.Height.AnimVal as SvgLength,
SvgLengthDirection.Vertical, bounds);
return result;
}
private static double CalcPatternUnit(SvgMaskElement maskElement, SvgLength length,
SvgLengthDirection dir, Rect bounds)
{
if (maskElement.MaskUnits.AnimVal.Equals(SvgUnitType.UserSpaceOnUse))
{
return length.Value;
}
else
{
double calcValue = length.ValueInSpecifiedUnits;
if (dir == SvgLengthDirection.Horizontal)
{
calcValue *= bounds.Width;
}
else
{
calcValue *= bounds.Height;
}
if (length.UnitType == SvgLengthType.Percentage)
{
calcValue /= 100F;
}
return calcValue;
}
}