EDOBE XDOM TAKE 6 IR - PRODUCTSHEET Especificaciones descargar pdf (Pagina 232)

CHAPTER 8: ExtendScript Tools and Features Specifying measurement values 232

Percentage values are relative to a total measurement. For example, 10% of 100 inches is 10 inches,

while 10% of 1 meter is 0.1 meters. The conversion base of a percentage is the unit value

corresponding to 100%.

The default

baseUnit of a unitValue object is 0.013889 inches, the base for pixels at 72 dpi. If the

unitValue is for pixels at any other dpi, or for a percentage value, you must set the baseUnit value

accordingly. The

baseUnit value is itself a unitValue object, containing both a magnitude and a unit.

For a system using a different DPI, you can change the

baseUnit value in the UnitValue class, thus

changing the default for all new

unitValue objects. For example, to double the resolution of pixels:

UnitValue.baseUnit = UnitValue (1/144, "in"); //144 dpi

To restore the default, assign null to the class property:

UnitValue.baseUnit = null; //restore default

You can override the default value for any particular unitValue object by setting the property in that

object. For example, to create a unitValue object for pixels with 96 dpi:

pixels = UnitValue (10, "px");

myPixBase = UnitValue (1/96, "in");

pixels.baseUnit = myPixBase;

For percentage measurements, set the baseUnit property to the measurement value for 100%. For

example, to create a

unitValue object for 40% of 10 feet:

myPctVal = UnitValue (40, "%");

myBase = UnitValue (10, "ft")

myPctVal.baseUnit = myBase;

Use the as() method to get to a percentage value as a unit value:

myFootVal = myPctVal.as ("ft"); // => 4

myInchVal = myPctVal.as ("in"); // => 36

You can convert a unitValue from an absolute measurement to pixels or percents in the same way:

myMeterVal = UnitValue (10, "m"); // 10 meters

myBase = UnitValue (1, "km");

myMeterVal.baseUnit = myBase; //as a percentage of 1 kilometer

pctOfKm = myMeterVal.as (’%’); // => 1

myVal = UnitValue ("1 in"); // Define measurement in inches

// convert to pixels using default base

myVal.convert ("px"); // => value=72 type=px

Computing with unit values

UnitValue objects can be used in computational JavaScript expressions. The way the value is used

depends on the type of operator.

X Unary operators (~, !, +, -)

~unitValue

The numeric value is converted to a 32-bit integer with inverted bits.

!unitValue

Result is true if the numeric value is nonzero, false if it is not.

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