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| More programming stuff... http://x404.co.uk/forum/viewtopic.php?f=3&t=4880 |
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| Author: | Fogmeister [ Fri Dec 11, 2009 9:31 am ] |
| Post subject: | More programming stuff... |
Hi Guys, I'm trying to do some work with colours (RGB values, etc...). The control that I have returns an integer and I have found a function that converts the integer into separate red, green and blue values. But it isn't working. The function I found is... input colourvalue. redvalue = colourvalue MOD 256. greenvalue = (colourvalue / 256) MOD 256. bluevalue = (colourvalue / 256 / 256) MOD 256. This seems to almost work but not quite. I have put the same formulae into Excel to check it is working correctly and it does. For instance, when I click a cyan like colour RGB(0,255,255). The int returned is 16776960. Excel turns this into 0,255,255 but my program thyinks it is 0,255,0. Simililarly when I select white, Excel says it is 255,255,255 but my program thinks it is 255,0,0. Not sure what could be going on here. Any ideas?! |
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| Author: | Fogmeister [ Fri Dec 11, 2009 9:34 am ] |
| Post subject: | Re: More programming stuff... |
Woohoo! Truncate is your freind! Stupid thing |
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| Author: | EddArmitage [ Fri Dec 11, 2009 9:35 am ] |
| Post subject: | Re: More programming stuff... |
I'd check the double-division for the blue one and add some extra brackets to be safe/clear. |
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| Author: | Fogmeister [ Fri Dec 11, 2009 9:42 am ] | |||||||||
| Post subject: | Re: More programming stuff... | |||||||||
That's what I thought is might be but it's down to rounding. The program was being too clever and turning 255.56738239... into 256. I needed to truncate instead. |
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