Class: TranslucentColor

• Inheritance
• Description
• Class protocol
  • instance creation
• Instance protocol
  • accessing
  • printing & storing
  • queries

Inheritance:

   Object
   |
   +--Color
      |
      +--TranslucentColor

Package:

stx:libview

Category:

Graphics-Support

Version:

rev: 1.3 date: 2007-06-06 16:58:02

user: cg

file: TranslucentColor.st directory: libview

module: stx stc-classLibrary: libview

Description:

TranslucentColor represents colors with an alpha (transparency)
channel.
This is experimental and not yet used by the system.

[Instance variables:]

  alpha           <Integer>       the internal alpha value (0..255)

Class protocol:

 red: r green: g blue: b alpha: alpha

Instance protocol:

 alpha

return the alpha value (0..1),
where 0 is completely transparent and 1 is completely opaque

 alpha: alphaFraction

set the alpha value (0..1),
where 0 is completely transparent and 1 is completely opaque

 privateAlpha

return the internal alpha value (0..255),
where 0 is completely transparent and 255 is completely opaque

 setAlphaByte: aByteValuedInteger

set the alpha value (0..255),
where 0 is completely transparent and 255 is completely opaque

 storeOn: aStream

append a string representing an expression to reconstruct the receiver
to the argument, aStream

 isOpaque

return true, if I represent an opaque color

 isTranslucent

return true, if I represent a translucent color;
that is: not completely opaque

 isTranslucentColor

return true, if I represent a translucent color;
This means: self isTranslucent, but isTransparent not

 isTransparent

return true, if I represent a completely transparent color