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Topic: DDRMs RGB color picker improved (Read 461 times) |
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michael
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Posts: 335
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DDRMs RGB color picker improved
« Thread started on: May 31st, 2016, 12:58pm » |
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This is how open source would work .. kinda.. if it was open source.. And I rarely see open source happen on any forum, even though there are posts on open source.
We can make it faster, better stronger !!
DDRM Is this program open source or public domain?
I had to modify a few controls, as I wanted more control of positioning. I don't know why you had VDU 4 instead of VDU 5.
I also placed the RGB numbers above the color selector so its handy for a user to write down.
I keep wondering if there is a way to directly use the hexadecimal in a color without converting it..
Looking at how COLOUR works, I take it, hexadecimal and the output value from TINT would be useless without conversion.
Even HTML uses R,G,B values, and I can prove this with a simple conversion from a program I made that creates HTML/CSS web pages..
Code: MODE 8
OFF
c%=FNGetColour
MOVE 0,150
PRINT c%
COLOUR 0,c% AND 255,(c%>>8)AND 255,(c%>>16) AND 255
GCOL 0
CIRCLE FILL 200,500,150
END
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DEFFNGetColour
LOCAL x%,y%,z%,r%,g%,b%,done%
done%=FALSE
REPEAT
*REFRESH OFF
GCOL 0
CLS
RECTANGLE FILL0,0,400,100
GCOL 15
MOVE 0,30
PRINT"B"
RECTANGLE 20,10,255,20
MOVE 0,60
PRINT"G"
RECTANGLE 20,40,255,20
MOVE 0,90
PRINT"R"
MOVE 10,120:GCOL 15:PRINT "R: "+STR$(r%)+" G: "+STR$(g%)+" B: "+STR$(b%)
MOVE 0,0
RECTANGLE 20,70,255,20
LINE 20+r%,70,20+r%,90
LINE 20+g%,40,20+g%,60
LINE 20+b%,10,20+b%,30
COLOUR 7,r%,g%,b%
GCOL 7
RECTANGLE FILL 300,10,80,80
GCOL 15
RECTANGLE 390,10,80,80
MOVE 410,65
PRINT "OK"
VDU 5
MOUSE x%,y%,z%
IF z%>0 THEN
CASE TRUE OF
WHEN y%>9 AND y%<31 AND x%>19 AND x%<276:b%=x%-20
WHEN y%>39 AND y%<61 AND x%>19 AND x%<276:g%=x%-20
WHEN y%>69 AND y%<91 AND x%>19 AND x%<276:r%=x%-20
WHEN y%>10 AND y%<90 AND x%>390 AND x%<470:done%=TRUE
ENDCASE
ENDIF
*REFRESH
UNTIL done%
COLOUR 7,200,200,200
*REFRESH ON
=(r%+(g%<<8)+(b%<<16))
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I like making program generators and like reinventing the wheel
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DDRM
Administrator
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Posts: 321
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Re: DDRMs RGB color picker improved
« Reply #1 on: Jun 6th, 2016, 11:49am » |
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Hi Michael,
Feel free to use any code I post on here as the basis for your own work.
I like the addition of showing the R,G,B values: either at the top as you have done, or maybe next to the slider bars?
In my code I set VDU 5 to tie the text cursor to the graphics cursor, then I released it again with VDU 4 before ending the routine - since that's the default - to reduce the risk of messing up the user's program when the routine returns.
I don't think there's a way of setting the colour using the combined hex value using "standard" BB4W commands, but there is a variable pointing to the palette, so you can set the entry using SetPaletteEntries.
Here's a brief example. The parameters are the handle of the palette, the index of the first colour you want to change, the number of colours you want to change, and a pointer to (an array of) colour numbers. Strictly, these should be PALETTEENTRY structures, including flags in the top byte, but the flags can be 0.
Code:
r&=200
g&=100
b&=0
col%=(b&<<16)+(g&<<8)+r&
COLOUR 4,r&,g&,b&
GCOL 4
CIRCLE FILL 200,200,200
GCOL 5
CIRCLE FILL 500,500,200
WAIT 100
SYS "SetPaletteEntries",@hpal%,5,1,^col%
CIRCLE FILL 500,500,200
Best wishes,
D
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