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devel / comp.lang.xharbour / Re: convert color to rgb

SubjectAuthor
* convert color to rgbMichael Hagl
+- convert color to rgbdlzc
`* convert color to rgbElla Stern
 `* convert color to rgbMichael Hagl
  `- convert color to rgbtimepro timesheet

1
convert color to rgb

<88a624c5-8fea-4860-9a2b-725ce7194b55n@googlegroups.com>

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Subject: convert color to rgb
From: inf...@hagl.de (Michael Hagl)
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 by: Michael Hagl - Fri, 10 Dec 2021 10:11 UTC

hi,
how can I convert a color value (1-255) to an RGB value?

I think I need an Array {{nColor, nRgbForegrundColor, nRgbBackgrundColor}} with 255 Lines. Im I right?

Thank you for some answers!

Michael Hagl

Re: convert color to rgb

<ae99cbde-8a01-4af4-a244-2e22b05269aan@googlegroups.com>

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Subject: Re: convert color to rgb
From: dlz...@cox.net (dlzc)
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 by: dlzc - Fri, 10 Dec 2021 14:12 UTC

Good morning Michael:

On Friday, December 10, 2021 at 3:11:15 AM UTC-7, in...@hagl.de wrote:
> hi,
> how can I convert a color value (1-255) to an RGB value?
>
> I think I need an Array {{nColor, nRgbForegrundColor, nRgbBackgrundColor}} with 255 Lines. Im I right?
>
> Thank you for some answers!

https://www.dostips.com/forum/viewtopic.php?t=8493
.... your problem in reverse.

It is just math. You parse the bits, and make them the highest order bits of the appropriate color. You can make an array, if you do this a lot.

David A. Smith

Re: convert color to rgb

<e0478eee-de77-4412-a19d-1a2b71e714a6n@googlegroups.com>

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Subject: Re: convert color to rgb
From: ellail...@gmail.com (Ella Stern)
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 by: Ella Stern - Fri, 10 Dec 2021 22:36 UTC

On Friday, December 10, 2021 at 12:11:15 PM UTC+2, in...@hagl.de wrote:
> hi,
> how can I convert a color value (1-255) to an RGB value?
>
> I think I need an Array {{nColor, nRgbForegrundColor, nRgbBackgrundColor}} with 255 Lines. Im I right?
>
> Thank you for some answers!
>
> Michael Hagl

In case of desktop apps the RGB value is an integer (on 4 bytes). The formula is described here (it does not include alpha channel):
https://math.stackexchange.com/questions/1635999/algorithm-to-convert-integer-to-3-variables-rgb
....but I don't understand what you need. If you are generating html files, the hexa color codes are simpler.

Re: convert color to rgb

<0ceaca54-1b62-4146-b71c-45957fe289e4n@googlegroups.com>

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https://www.novabbs.com/devel/article-flat.php?id=10398&group=comp.lang.xharbour#10398

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Subject: Re: convert color to rgb
From: inf...@hagl.de (Michael Hagl)
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 by: Michael Hagl - Mon, 13 Dec 2021 08:25 UTC

Hi Ella,

I need it for PageScript function PsTextOut()
Function PSTextOut(nTop, nLeft, xValue, cPicture, nJustify, cFontName, nFontSize, nFontStyle, nFontFColor, nFontBColor, nAngle)

nFontFColor, nFontBColor has to be RGB values. I want to convert Colorstring "b/n" t two RGB values.

Ella Stern schrieb am Freitag, 10. Dezember 2021 um 23:36:38 UTC+1:
> On Friday, December 10, 2021 at 12:11:15 PM UTC+2, wrote:
> > hi,
> > how can I convert a color value (1-255) to an RGB value?
> >
> > I think I need an Array {{nColor, nRgbForegrundColor, nRgbBackgrundColor}} with 255 Lines. Im I right?
> >
> > Thank you for some answers!
> >
> > Michael Hagl
> In case of desktop apps the RGB value is an integer (on 4 bytes). The formula is described here (it does not include alpha channel):
> https://math.stackexchange.com/questions/1635999/algorithm-to-convert-integer-to-3-variables-rgb
> ...but I don't understand what you need. If you are generating html files, the hexa color codes are simpler.

Re: convert color to rgb

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Subject: Re: convert color to rgb
From: timecost...@gmail.com (timepro timesheet)
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 by: timepro timesheet - Mon, 13 Dec 2021 11:42 UTC

On Monday, December 13, 2021 at 1:55:25 PM UTC+5:30, in...@hagl.de wrote:
> Hi Ella,
>
> I need it for PageScript function PsTextOut()
> Function PSTextOut(nTop, nLeft, xValue, cPicture, nJustify, cFontName, nFontSize, nFontStyle, nFontFColor, nFontBColor, nAngle)
>
> nFontFColor, nFontBColor has to be RGB values. I want to convert Colorstring "b/n" t two RGB values.
>
>
> Ella Stern schrieb am Freitag, 10. Dezember 2021 um 23:36:38 UTC+1:
> > On Friday, December 10, 2021 at 12:11:15 PM UTC+2, wrote:
> > > hi,
> > > how can I convert a color value (1-255) to an RGB value?
> > >
> > > I think I need an Array {{nColor, nRgbForegrundColor, nRgbBackgrundColor}} with 255 Lines. Im I right?
> > >
> > > Thank you for some answers!
> > >
> > > Michael Hagl
> > In case of desktop apps the RGB value is an integer (on 4 bytes). The formula is described here (it does not include alpha channel):
> > https://math.stackexchange.com/questions/1635999/algorithm-to-convert-integer-to-3-variables-rgb
> > ...but I don't understand what you need. If you are generating html files, the hexa color codes are simpler.

i simply use this, works ok:
xnb=rgb(0,0,128) - navy blue
xw=rgb(255,255,255) - white
pssetfont(fontname,fontstyle,fontsize,xnb,xw)
pstextout(xx,yy,'blah blah...')
....

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