mirror of
https://github.com/QB64-Phoenix-Edition/QB64pe.git
synced 2024-07-26 17:55:52 +00:00
6e01fc8dce
Added new _STRCMP and _STRICMP commands for quick string comparisons. Cleaned up QB64 to finish removing the QUI (quick user insert) code and folders. Altered UCASE and LCASE routines to be faster in some situations for us.
58 lines
2.7 KiB
Plaintext
58 lines
2.7 KiB
Plaintext
The {{KW|_RGBA32}} function ALWAYS returns the 32-bit ''RGBA'' color value with specified red, green, blue and alpha component intensities.
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{{PageSyntax}}
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:{{Parameter|result~&}} = [[_RGBA32]]'''({{Parameter|red&}}, {{Parameter|green&}}, {{Parameter|blue&}}, {{Parameter|alpha&}})'''
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{{PageDescription}}
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* The value returned is ALWAYS a 32 bit [[_UNSIGNED]] [[LONG]] color value.
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* '''Return variable types MUST be [[LONG]] or you 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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* {{Parameter|alpha&}} specifies the [[_ALPHA|''alpha'']] component transparency value from 0 (fully transparent) to 255 (opaque).
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* Alpha or intensity values outside of the valid range of 0 to 255 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$]]([[MKL$]](colorvalue&), 3) to place 3 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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''Example:'' Changing the [[ALPHA]] value to fade an image in and out using a 32 bit PNG image!
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{{CodeStart}} '' ''
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{{Cl|SCREEN (statement)|SCREEN}} {{Cl|_NEWIMAGE}}(600, 400, 32)
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img& = {{Cl|_LOADIMAGE}}("qb64.png") 'use any 24/32 bit image
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'//Turn off auto display
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{{Cl|_DISPLAY}}
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' Fade in
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{{Cl|FOR...NEXT|FOR}} i% = 255 {{Cl|TO}} 0 {{Cl|STEP}} -5
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{{Cl|_LIMIT}} 20 'control fade speed
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{{Cl|_PUTIMAGE}} (0, 0)-(600, 400), img&
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{{Cl|LINE}} (0, 0)-(600, 400), {{Cl|_RGBA}}(0, 0, 0, i%), BF 'increase black box transparency
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{{Cl|_DISPLAY}}
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{{Cl|NEXT}}
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' Fade out
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{{Cl|FOR...NEXT|FOR}} i% = 0 {{Cl|TO}} 255 {{Cl|STEP}} 5
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{{Cl|_LIMIT}} 20 'control fade speed
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{{Cl|_PUTIMAGE}} (0, 0)-(600, 400), img&
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{{Cl|LINE}} (0, 0)-(600, 400), {{Cl|_RGBA}}(0, 0, 0, i%), BF 'decrease black box transparency
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{{Cl|_DISPLAY}}
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{{Cl|NEXT}}
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{{Cl|END}} '' ''
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{{CodeEnd}}
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{{small|Code by Unseen Machine}}
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:''Note:'' The QB64.PNG bee image used is available at the top of the QB64 forum: http://www.qb64.net/forum/index.php
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{{PageSeeAlso}}
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* [[_RGB32]], [[_RGBA]], [[_RGB]]
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* [[_RED32]], [[_GREEN32]], [[_BLUE32]]
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* [[HEX$ 32 Bit Values]], [[POINT]]
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* [[SAVEIMAGE]] {{text|(bitmap creator)}}
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* [http://www.w3schools.com/html/html_colornames.asp Hexadecimal Color Values]
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{{PageNavigation}} |