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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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54 lines
2.7 KiB
Plaintext
54 lines
2.7 KiB
Plaintext
{{DISPLAYTITLE:_RGBA}}
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The [[_RGBA]] function returns the closest palette index (legacy SCREEN modes) OR the 32-bit [[LONG]] color value (32-bit screens).
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{{PageSyntax}}
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: {{Parameter|colorIndex~&}} = [[_RGBA]]({{Parameter|red&}}, {{Parameter|green&}}, {{Parameter|blue&}}, {{Parameter|alpha&}}[, {{Parameter|imageHandle&}}]''')'''
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* The value returned is either the closest color attribute number or a 32-bit [[_UNSIGNED]] [[LONG]] color value.
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* '''Return variable types must be [[LONG]] or the resulting color may lose the [[_BLUE]] value.'''
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* {{Parameter|red&}} specifies the red component intensity from 0 to 255.
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* {{Parameter|green&}} specifies the green component intensity from 0 to 255.
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* {{Parameter|blue&}} specifies the blue component intensity from 0 to 255.
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* The [[_ALPHA|''alpha&'']] value can be set to make the color transparent (0), opaque (255) or somewhere in between.
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* Parameter values outside of the 0 to 255 range are clipped.
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* Returns [[LONG]] 32-bit hexadecimal values from '''&H00{{text|00|red}}{{text|00|green}}{{text|00|blue}}''' to '''&HFF{{text|FF|red}}{{text|FF|green}}{{text|FF|blue}}''' with varying [[_ALPHA]] transparency.
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* When [[LONG]] values are [[PUT]] to file, the ARGB values become BGRA. Use [[LEFT$]]([[MKL$]]({{Parameter|colorIndex~&}}), 3) to place 3 colors.
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* If {{Parameter|imageHandle&}} is omitted, the image is assumed to be the current [[_DEST|destination]] or [[SCREEN]] page.
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* Allows the blending of pixel colors red, green and blue to create any of 16 million colors.
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* '''NOTE: Default 32-bit backgrounds are clear black or [[_RGBA]](0, 0, 0, 0). Use [[CLS]] to make the black opaque.'''
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{{PageExamples}}
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''Example:'' Setting a font's background color alpha to clear to overlay a second text color.
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{{CodeStart}} '' ''
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scrn& = {{Cl|_NEWIMAGE}}(400, 400, 32)
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{{Cl|SCREEN (statement)|SCREEN}} scrn&
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fnt& = {{Cl|_LOADFONT}}("C:\WINDOWS\FONTS\ARIAL.TTF", 26)
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{{Cl|_FONT}} fnt&
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X% = 20
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Y% = 20
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{{Cl|COLOR}} {{Cl|_RGB}}(255, 255, 255), {{Cl|_RGB}}(0, 0, 0) 'Foreground set to WHITE background to BLACK
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{{Cl|_PRINTSTRING}} (X%, Y%), "Hello World"
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{{Cl|COLOR}} {{Cl|_RGB}}(255, 0, 0), {{Cl|_RGBA}}(0, 0, 0, 0) 'Foreground set to RED background to TRANSPARENT BLACK
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{{Cl|_PRINTSTRING}} (X% + 2, Y% + 2), "Hello World"
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{{Cl|END}} '' ''
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{{CodeEnd}}
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{{small|Code by Unseen Machine}}
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''Explanation:'' [[_PRINTSTRING]] allows text or font colors to be alpha blended in 32 bit screens.
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{{PageSeeAlso}}
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* [[_RGB]], [[_RGB32]], [[_RGBA32]]
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* [[_RED]], [[_GREEN]], [[_BLUE]]
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* [[_LOADIMAGE]]
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* [[_PRINTSTRING]]
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* [[HEX$ 32 Bit Values]], [[POINT]]
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* [[SAVEIMAGE]]
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* [http://www.w3schools.com/html/html_colornames.asp Hexadecimal Color Values]
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{{PageNavigation}}
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