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79 lines
4 KiB
Markdown
79 lines
4 KiB
Markdown
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The [_PALETTECOLOR](_PALETTECOLOR) statement sets the color value of a palette entry of an image using 256 color modes or less (4 or 8 BPP).
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## Syntax
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> [_PALETTECOLOR](_PALETTECOLOR) attribute%, newColor&[, destHandle&]
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## Description
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* The attribute% is the palette index number of the color to set, ranging from 0 to 15 (4 bit) or 0 to 255 (8 bit) color modes.
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* The [LONG](LONG) newColor& is the new color value to set using [_RGB32](_RGB32) or [_RGBA32](_RGBA32) values or using [HEX$ 32 Bit Values](HEX$-32-Bit-Values).
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* If destHandle& is omitted, [_DEST](_DEST) is assumed to be the current write page or screen surface.
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* If attribute% is outside of image or [SCREEN](SCREEN) mode attribute range (0 to 15 or 0 to 255), an [ERROR Codes](ERROR-Codes) error will occur.
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* If destHandle& does not use a palette, an [ERROR Codes](ERROR-Codes) error occurs. **Will not work in 24/32 bit color palette modes.**
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* If destHandle& is an invalid handle value, an [ERROR Codes](ERROR-Codes) error occurs.
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**Basic's 16 Default Color Attributes (non-[DAC](DAC))**
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```text
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Attribute Description Red Green Blue 32 HEX HTML Name
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0 Black 0 0 0 000000 Black
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1 Dark Blue 0 0 42 00008B DarkBlue
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2 Dark Green 0 42 0 006400 DarkGreen
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3 Dark Cyan 0 42 42 008B8B DarkCyan
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4 Dark Red 42 0 0 8B0000 DarkRed
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5 Dark Magenta 42 0 42 8B008B DarkMagenta
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6 Dark Yellow 42 21 0 DAA520 GoldenRod
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7 Light Grey 42 42 42 D3D3D3 LightGrey
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8 Dark Grey 21 21 21 696969 DimGray
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9 Blue 21 21 63 0000FF Blue
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10 Green 21 63 21 15FF15 Lime
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11 Cyan 21 63 63 15FFFF Cyan
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12 Red 63 21 21 FF1515 Red
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13 Magenta 63 21 63 FF15FF Magenta
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14 Yellow 63 63 21 FFFF00 Yellow
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15 White 63 63 63 FFFFFF White
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```
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[HTML Color Table Values and Names](http://www.w3schools.com/html/html_colornames.asp) or [Other RGB colors](http://www.tayloredmktg.com/rgb/#OR)
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* *Note:* **QB64** 32 bit color intensity values from 0 to 255 can be found by multiplying above values by 4.
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*Summary:* The red, green, and blue intensity values can be changed using [OUT](OUT) or [PALETTE](PALETTE) statements. Some **QBasic** RGB color attribute values can be changed in [DAC](DAC) [SCREEN (statement)](SCREEN-(statement)) modes and the [DAC](DAC) RGB intensity settings may be different.
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## Example(s)
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Creating custom background colors in SCREEN 0 that follow the text. [CLS](CLS) makes entire background one color.
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```vb
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_PALETTECOLOR 1, _RGB32(255, 255, 255) ' white.
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_PALETTECOLOR 2, _RGB32(255, 170, 170) ' lighter red.
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_PALETTECOLOR 3, _RGB32(255, 85, 85) ' light red.
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_PALETTECOLOR 4, _RGB32(255, 0, 0) ' red.
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_PALETTECOLOR 5, _RGB32(170, 0, 0) ' dark red.
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_PALETTECOLOR 6, _RGB32(85, 0, 0) ' darker red.
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COLOR 0, 1: PRINT "black on white."
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COLOR 0, 2: PRINT "black on lighter red."
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COLOR 0, 3: PRINT "black on light red."
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COLOR 0, 4: PRINT "black on red."
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COLOR 0, 5: PRINT "black on dark red."
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COLOR 0, 6: PRINT "black on darker red.
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COLOR 1, 6: PRINT "white on darker red"
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COLOR 2, 6: PRINT "ligher red on darker red"
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```
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> *Note:* [_PALETTECOLOR](_PALETTECOLOR) expects [LONG](LONG) [_RGB32](_RGB32) or [_RGBA32](_RGBA32) 32 bit color values, not [_RGB](_RGB) or [_RGBA](_RGBA) palette attribute values.
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## See Also
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* [COLOR](COLOR), [_RGB32](_RGB32), [_RGBA32](_RGBA32)
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* [_PALETTECOLOR (function)](_PALETTECOLOR-(function))
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* [PALETTE](PALETTE), [OUT](OUT), [INP](INP)
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* [Images](Images)
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* [HEX$ 32 Bit Values](HEX$-32-Bit-Values)
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