PALETTE: Difference between revisions
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Created page with "The PALETTE statement can swap color settings, set colors to default or set the red, green and blue color components of palette colors. {{PageSyntax}} : PALETTE [{{Parameter|attribute%}}, ''red%'' + (''green%'' * 256) + (''blue%'' * 65536)] : PALETTE [{{Parameter|existingAttribute%}}, {{Parameter|newAttribute%}}] {{PageDescription}} * {{Parameter|red%}}, {{Parameter|green%}} and {{Parameter|blue%}} values can range from 0 to 63. Many color shades are po..." |
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{{Cl|SCREEN (statement)|SCREEN}} 9 ' background is default black | {{Cl|SCREEN (statement)|SCREEN}} 9 ' background is default black | ||
{{Cl|LOCATE}} 20, 33: {{Cl|PRINT}} "Press any Key!" | {{Cl|LOCATE}} 20, 33: {{Cl|PRINT}} "Press any Key!" | ||
{{Cl|FOR...NEXT|FOR}} i = 1 {{Cl|TO}} | {{Cl|FOR...NEXT|FOR}} i = 1 {{Cl|TO}} 63 | ||
a$ = {{Cl|INPUT$}}(1) ' wait for a keypress | a$ = {{Cl|INPUT$}}(1) ' wait for a keypress | ||
{{Cl|PALETTE}} 0, i | {{Cl|PALETTE}} 0, i | ||
Revision as of 22:15, 3 May 2022
The PALETTE statement can swap color settings, set colors to default or set the red, green and blue color components of palette colors.
Syntax
- PALETTE [attribute%, red% + (green% * 256) + (blue% * 65536)]
- PALETTE [existingAttribute%, newAttribute%]
Description
- red%, green% and blue% values can range from 0 to 63. Many color shades are possible in non-DAC color attributes.
- If the red%, green% and blue% color intensity settings are all the same value the resulting color is a shade of grey.
- A swap is often used with DAC color attributes that cannot change RGB settings. Only the RGB color settings are swapped from original existingAttribute% to newAttribute%. Screens 0 thru 9 support swaps. Screen 10 supports up to attribute 8 only.
- PALETTE without any value sets any changed RGB settings back to the default color settings, including DAC colors.
- PALETTE USING can be used when color intensity values are stored in an array.
- QB64 implements the _PALETTECOLOR statement to provide extended palette functionality.
QBasic/QuickBASIC
- Screens 0, 7 and 9 (DAC) colors could not be changed using the first syntax, but the program could use OUT to change intensity settings of attributes 1 thru 5.
Examples
Example: Displaying all 64 DAC color hues as backgrounds in SCREEN 9 using a PALETTE swap.
SCREEN 9 ' background is default black LOCATE 20, 33: PRINT "Press any Key!" FOR i = 1 TO 63 a$ = INPUT$(1) ' wait for a keypress PALETTE 0, i NEXT |
- Note: Other attributes (1 to 15) can also be swapped for DAC foreground colors.
See also