/// <summary>
/// Gets the value expressed in the English Metrics Units.
/// </summary>
private static Int64 ComputeInEmus(UnitMetric type, double value)
{
/* Compute width and height in English Metrics Units.
* There are 360000 EMUs per centimeter, 914400 EMUs per inch, 12700 EMUs per point
* widthInEmus = widthInPixels / HorizontalResolutionInDPI * 914400
* heightInEmus = heightInPixels / VerticalResolutionInDPI * 914400
*
* According to 1 px ~= 9525 EMU -> 914400 EMU per inch / 9525 EMU = 96 dpi
* So Word use 96 DPI printing which seems fair.
* http://hastobe.net/blogs/stevemorgan/archive/2008/09/15/howto-insert-an-image-into-a-word-document-and-display-it-using-openxml.aspx
* http://startbigthinksmall.wordpress.com/2010/01/04/points-inches-and-emus-measuring-units-in-office-open-xml/
*
* The list of units supported are explained here: http://www.w3schools.com/css/css_units.asp
*/
switch (type)
{
case UnitMetric.Auto:
case UnitMetric.Percent: return(0L); // not applicable
case UnitMetric.Emus: return((long)value);
case UnitMetric.Inch: return((long)(value * 914400L));
case UnitMetric.Centimeter: return((long)(value * 360000L));
case UnitMetric.Millimeter: return((long)(value * 3600000L));
case UnitMetric.EM:
// well this is a rough conversion but considering 1em = 12pt (http://sureshjain.wordpress.com/2007/07/06/53/)
return((long)(value / 72 * 914400L * 12));
case UnitMetric.Ex:
return((long)(value / 72 * 914400L * 12) / 2);
case UnitMetric.Point: return((long)(value * 12700L));
case UnitMetric.Pica: return((long)(value / 72 * 914400L) * 12);
case UnitMetric.Pixel: return((long)(value / 96 * 914400L));
default: goto case UnitMetric.Pixel;
}
}
public static Unit Parse(String str)
{
if (str == null)
{
return(Unit.Empty);
}
str = str.Trim().ToLowerInvariant();
int length = str.Length;
int digitLength = -1;
for (int i = 0; i < length; i++)
{
char ch = str[i];
if ((ch < '0' || ch > '9') && (ch != '-' && ch != '.' && ch != ','))
{
break;
}
digitLength = i;
}
if (digitLength == -1)
{
// No digits in the width, we ignore this style
return(str == "auto"? Unit.Auto : Unit.Empty);
}
UnitMetric type;
if (digitLength < length - 1)
{
type = Converter.ToUnitMetric(str.Substring(digitLength + 1).Trim());
}
else
{
type = UnitMetric.Pixel;
}
string v = str.Substring(0, digitLength + 1);
double value;
try
{
value = Convert.ToDouble(v, CultureInfo.InvariantCulture);
if (value < Int16.MinValue || value > Int16.MaxValue)
{
return(Unit.Empty);
}
}
catch (FormatException)
{
return(Unit.Empty);
}
catch (ArithmeticException)
{
return(Unit.Empty);
}
return(new Unit(type, value));
}
public Unit(UnitMetric type, Double value)
{
this.type = type;
this.value = value;
this.valueInEmus = ComputeInEmus(type, value);
}
public Unit(UnitMetric type, Double value)
{
this.type = type;
this.value = value;
this.valueInEmus = ComputeInEmus(type, value);
}
/// <summary>
/// Gets the value expressed in the English Metrics Units.
/// </summary>
private static Int64 ComputeInEmus(UnitMetric type, double value)
{
/* Compute width and height in English Metrics Units.
* There are 360000 EMUs per centimeter, 914400 EMUs per inch, 12700 EMUs per point
* widthInEmus = widthInPixels / HorizontalResolutionInDPI * 914400
* heightInEmus = heightInPixels / VerticalResolutionInDPI * 914400
*
* According to 1 px ~= 9525 EMU -> 914400 EMU per inch / 9525 EMU = 96 dpi
* So Word use 96 DPI printing which seems fair.
* http://hastobe.net/blogs/stevemorgan/archive/2008/09/15/howto-insert-an-image-into-a-word-document-and-display-it-using-openxml.aspx
* http://startbigthinksmall.wordpress.com/2010/01/04/points-inches-and-emus-measuring-units-in-office-open-xml/
*
* The list of units supported are explained here: http://www.w3schools.com/css/css_units.asp
*/
switch (type)
{
case UnitMetric.Auto:
case UnitMetric.Percent: return 0L; // not applicable
case UnitMetric.Emus: return (long) value;
case UnitMetric.Inch: return (long) (value * 914400L);
case UnitMetric.Centimeter: return (long) (value * 360000L);
case UnitMetric.Millimeter: return (long) (value * 3600000L);
case UnitMetric.EM:
// well this is a rough conversion but considering 1em = 12pt (http://sureshjain.wordpress.com/2007/07/06/53/)
return (long) (value / 72 * 914400L * 12);
case UnitMetric.Ex:
return (long) (value / 72 * 914400L * 12) / 2;
case UnitMetric.Point: return (long) (value * 12700L);
case UnitMetric.Pica: return (long) (value / 72 * 914400L) * 12;
case UnitMetric.Pixel: return (long) (value / 96 * 914400L);
default: goto case UnitMetric.Pixel;
}
}
public static Unit Parse(String str)
{
if (str == null) return Unit.Empty;
str = str.Trim().ToLower(CultureInfo.InvariantCulture);
int length = str.Length;
int digitLength = -1;
for (int i = 0; i < length; i++)
{
char ch = str[i];
if ((ch < '0' || ch > '9') && (ch != '-' && ch != '.' && ch != ','))
break;
digitLength = i;
}
if (digitLength == -1)
{
// No digits in the width, we ignore this style
return str == "auto"? Unit.Auto : Unit.Empty;
}
UnitMetric type;
if (digitLength < length - 1)
type = ConverterUtility.ConvertToUnitMetric(str.Substring(digitLength + 1).Trim());
else
type = UnitMetric.Pixel;
string v = str.Substring(0, digitLength + 1);
double value;
try
{
TypeConverter converter = new DoubleConverter();
value = (double) converter.ConvertFromString(null, CultureInfo.InvariantCulture, v);
if (value < Int16.MinValue || value > Int16.MaxValue)
return Unit.Empty;
}
catch (FormatException)
{
return Unit.Empty;
}
catch (ArithmeticException)
{
return Unit.Empty;
}
return new Unit(type, value);
}
