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CHAPTER 8: ExtendScript Tools and Features Specifying measurement values 230
Specifying measurement values
ExtendScript provides the UnitValue object to represent measurement values. The properties and
methods of the
UnitValue object make it easy to change the value, the unit, or both, or to perform
conversions from one unit to another.
UnitValue object
Represents measurement values that contain both the numeric magnitude and the unit of measurement.
UnitValue object constructor
The UnitValue constructor creates a new UnitValue object. The keyword new is optional:
myVal = new UnitValue (value, unit);
myVal = new UnitValue ("value unit");
myVal = new UnitValue (value, "unit");
The value is a number, and the unit is specified with a string in abbreviated, singular, or plural form, as
shown in the following table.
If an unknown unit type is supplied, the type is set to
"?", and the UnitValue object prints as "UnitValue
0.00000".
Abbreviation Singular Plural Comments
in inch inches 2.54 cm
ft foot feet 30.48 cm
yd yard yards 91.44 cm
mi mile miles 1609.344 m
mm millimeter millimeters
cm centimeter centimeters
m meter meters
km kilometer kilometers
pt point points inches / 72
pc pica picas points * 12
tpt traditional point traditional points inches / 72.27
tpc traditional pica traditional picas 12 tpt
ci cicero ciceros 12.7872 pt
px pixel pixels baseless (see below)
% percent percent baseless (see below)
- JAVASCRIPT TOOLS GUIDE 1
- Contents 3
- Introduction 9
- External communication 11
- Startup scripts 12
- JavaScript variables 12
- The ExtendScript Toolkit 13
- Panel menus 14
- Document windows 15
- Workspaces 16
- Selecting scripts 17
- The Script Editor 18
- Navigation aids 19
- Bookmarks 20
- Coding aids 22
- Brace matching 23
- Block indentation 23
- Version comments 23
- Searching in text 24
- Syntax marking 26
- Debugging in the Toolkit 27
- The JavaScript console 28
- Controlling code execution 29
- Out Of Memory, always 30
- Setting breakpoints 31
- Breakpoint icons 32
- Evaluation in help tips 33
- Tracking data 33
- The call stack 34
- Inspecting object models 36
- File System Access 39
- The home directory 41
- Volume and drive names 41
- Portability issues 42
- Unicode I/O 43
- File error handling 43
- File access error messages 44
- Additional encodings 45
- Common encoding names 46
- File object 47
- File class properties 48
- File class functions 48
- File object properties 49
- File object functions 51
- Folder object 56
- Folder class functions 58
- Folder object properties 59
- Folder object functions 59
- User-Interface Tools 62
- ScriptUI programming model 63
- Container elements 64
- Window layout 64
- Adding elements to containers 65
- Creation properties 66
- Accessing child elements 66
- Types of controls 67
- User-interface controls 68
- Displaying images 72
- Creating multi-column lists 73
- Prompts and alerts 74
- Modal dialogs 74
- Dismissing a modal dialog 75
- Default and cancel elements 75
- Size and location objects 76
- Drawing objects 77
- Resource specifications 78
- Using resource strings 79
- Simulating user events 82
- Automatic layout 86
- Default layout behavior 87
- Automatic layout properties 87
- Container orientation 88
- Aligning children 88
- Alignment in two dimensions 90
- Setting margins 91
- Spacing between children 91
- Determining a preferred size 92
- Creating dynamic content 94
- Custom layout-manager example 95
- Managing control titles 98
- Title truncation 102
- ScriptUI object reference 105
- ScriptUI class 105
- ScriptUI class functions 107
- Common properties 108
- Window class 110
- Window class functions 111
- Window object 112
- Window object properties 113
- Container properties 115
- Window object functions 118
- Control objects 123
- NTER or the control 125
- Control object properties 135
- Control object functions 142
- List control object functions 144
- FlashPlayer control functions 145
- NTER. The exact behavior 147
- DrawState object 148
- Event handling 149
- UIEvent object functions 150
- KeyboardEvent object 151
- MouseEvent object 153
- MouseEvent object functions 154
- Graphic customization objects 155
- ScriptUIBrush object 161
- ScriptUIFont object 161
- ScriptUIImage object 162
- ScriptUIPath object 162
- ScriptUIPen object 163
- Custom element class 163
- LayoutManager object 165
- Communications overview 166
- Cross-DOM functions 167
- Startup folder locations 168
- Cross-DOM API reference 168
- Sending messages 170
- Receiving messages 172
- Handling unsolicited messages 172
- Passing simple types 177
- Passing complex types 177
- BridgeTalk class 179
- BridgeTalk class properties 180
- BridgeTalk class functions 181
- BridgeTalk message object 185
- Messaging error codes 190
- Application specifiers 191
- Namespace specifiers 193
- External Communication Tools 194
- Chat server sample 195
- Socket object reference 197
- ExternalObject object 201
- ExternalObject class function 202
- Additional functions 203
- Library initialization 204
- Library termination 205
- Shared-library function API 206
- SoServerInterface 207
- SoObjectInterface 210
- Support structures 213
- TaggedData 214
- Dollar ($) object 216
- Dollar ($) object functions 218
- Function Return type 220
- Reflection object 221
- ReflectionInfo object 222
- Locale names 225
- Testing localization 226
- Global localize function 226
- User notification dialogs 227
- Global confirm function 228
- Global prompt function 229
- Specifying measurement values 230
- UnitValue object properties 231
- UnitValue object functions 231
- Computing with unit values 232
- Preprocessor directives 233
- Operator overloading 235
- The XML Object 237
- Accessing XML elements 238
- Accessing XML attributes 239
- Viewing XML objects 239
- Retrieving contained elements 241
- Setting a default namespace 243
- Mixing XML and JavaScript 244
- XML lists 244
- XML Object Reference 246
- XML class functions 247
- XML object properties 247
- XML object functions 248
- Global functions 254
- QName object 255
- Namespace object 255
- Namespace object constructors 256
- Namespace object properties 256
- Using the XMP scripting API 258
- XMPScript object reference 261
- XMPAliasInfo object 262
- XMPConst object 262
- XMPDateTime object 265
- XMPDateTime object properties 266
- XMPDateTime object functions 266
- XMPFile object 267
- XMPFile object constructors 268
- XMPFile class properties 268
- XMPFile class functions 269
- XMPFile object functions 269
- XMPFileInfo object 271
- XMPIterator object 272
- XMPMeta object 272
- XMPMeta object constructors 273
- XMPMeta class properties 273
- XMPMeta class functions 273
- direct mapping. It can be 275
- XMPMeta object functions 276
- The new string value 284
- XMPPacketInfo object 287
- XMPProperty object 287
- XMPUtils object 288
- Porting Guide 294
- 295 295
- Index 296 296
- Index 297 297
- Index 298 298
- Index 299 299
- Index 300 300
- Index 301 301
- Index 302 302
- Index 303 303
- Index 304 304
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