$COLOR: Difference between revisions

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:To prevent these conflicts, the [[COLOR]] values have had '''NP_''' prepended to the front of them, to distinguish them from the non-prefixed command names.  All other color names remain the same, with only the three colors in conflict having to use '''NP_''' (for '''N'''o '''P'''refix) in front of them.
:To prevent these conflicts, the [[COLOR]] values have had '''NP_''' prepended to the front of them, to distinguish them from the non-prefixed command names.  All other color names remain the same, with only the three colors in conflict having to use '''NP_''' (for '''N'''o '''P'''refix) in front of them.
(¹) (QBPE = QB64 Phoenix Edition)
(¹) QBPE = QB64 Phoenix Edition





Revision as of 23:57, 28 April 2022

$COLOR is a metacommand that adds named color constants in a program.


Syntax

$COLOR:0
$COLOR:32


Description

  • $COLOR:0 adds constants for colors 0-15. The actual constant names can be found in the file source/utilities/color0.bi.
  • $COLOR:32 adds constants for 32-bit colors, similar to HTML color names. The actual constant names can be found in the file source/utilities/color32.bi.
  • $COLOR is a shorthand to manually using $INCLUDE pointing to the files listed above.
  • Prior to QBPE v0.5 (¹), $COLOR was not compatible with $NOPREFIX.
  • Since QBPE v0.5, $COLOR can now be used with $NOPREFIX, with a few notable differences to three conflicting colors -- Red, Green, Blue.
Red would conflict with _RED, Green would conflict with _GREEN, and Blue would conflict with _BLUE, once the underscore was removed from those commands with $NOPREFIX.
To prevent these conflicts, the COLOR values have had NP_ prepended to the front of them, to distinguish them from the non-prefixed command names. All other color names remain the same, with only the three colors in conflict having to use NP_ (for No Prefix) in front of them.

(¹) QBPE = QB64 Phoenix Edition


Examples

Example 1: Adding named color constants for SCREEN 0:

$COLOR:0
COLOR BrightWhite, Red
PRINT "Bright white on red."
Bright white on red.

Example 2: Adding named color constants for 32-bit modes:

SCREEN _NEWIMAGE(640, 400, 32)
$COLOR:32
COLOR CrayolaGold, DarkCyan
PRINT "CrayolaGold on DarkCyan."

Example 3: Adding named color constants for 32-bit modes (with $NOPREFIX in effect):

SCREEN _NEWIMAGE(640, 400, 32)
$COLOR:32
$NOPREFIX
COLOR NP_Red, White 'notice the NP_ in front of Red?  
'This is to distinguish the color from the command with $NOPREFIX.
PRINT "Red on White."


See also



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