Color Save/Restore

[Ranguna259]

This is not a library or a game it's just two pieces of code that became really helpful to me, so why not share it

I've came across times where I had to save the current color into local variables, change the color to the color I wanted and then changing it back, this process occupies a total of three lines of code, not much but It can get smaller to two lines (not much but) and WAY better.

With this code you can do things like fast RGB changes with the actual color name, type one line to save and another to restore, simple.

Some exemples for the use:

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--(love's default color is white, 255,255,255)
saveColor()
love.graphics.print('white',10,10)
love.graphics.setColor(255,0,0)
love.graphics.print('red',10,25)
restoreColor()
love.graphics.print('white again',10,40)

Color profile exemple:

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saveColor('magenta',255,0,255)
saveColor()
love.graphics.print('white',10,10)
restoreColor('magenta')
love.graphics.print('magenta',10,25)
retoreColor()
love.graphics.print('white again',10,40)

You can even save the current color to a profile:

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saveColor()
love.graphics.print('white',10,10)
love.graphics.setColor(255,0,0)
saveColor('red')
love.graphics.print('red',10,25)
restoreColor()
love.graphics.print('white again',10,40)
restoreColor('red')
love.graphics.print('red again',10,55)

Those were some (or all) exemples of what these two function can do.
And here they are:

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function restoreColor(profile)
	 if colorsavetable==nil then colorsavetable={} return end
	 if profile==nil then profile='SaveRestore' end
	 love.graphics.setColor(colorsavetable[profile].r,colorsavetable[profile].g,colorsavetable[profile].b)
end
function saveColor(profile,r,g,b)
	 if colorsavetable==nil then colorsavetable={} end
	 if profile==nil then profile='SaveRestor' end
	 colorsavetable[profile]={}
	 if profile~='SaveRestore' and r~=nil and g~=nil and b~=nil then
		 colorsavetable[profile].r,colorsavetable[profile].g,colorsavetable[profile].b=r,g,b
	 else
		 colorsavetable[profile].r,colorsavetable[profile].g,colorsavetable[profile].b=love.graphics.getColor()
	 end
end

( 'SaveRestor' profile is used for fast save and restore, so if you set a RGB to it, it'll change it again if you do saveColor() )
Licence free to use, share and copy for commercial and none commercial works, no need to copy the licence to your work.

[raidho36]

Making a function for a one-liner piece of code is an utter performance waste. And I don't honestly beleive that something as simple as that really needs to be a library.

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r, g, b, a= love.graphics.getColor ( )
love.graphics.draw ( )
love.graphics.setColor ( r, g, b, a )

[Ranguna259]

Actualy

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r, g, b, a= love.graphics.getColor ( )
love.graphics.setColor(your color)
love.graphics.draw ( )
love.graphics.setColor ( r, g, b, a )

[raidho36]

You can actually make a useful library by making hsv-rgb converter. Although I'm pretty sure there's vast loads of them already.

[Ranguna259]

Yeah, found this:

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function HSV(h, s, v)
    if s <= 0 then return v,v,v end
    h, s, v = h/256*6, s/255, v/255
    local c = v*s
    local x = (1-math.abs((h%2)-1))*c
    local m,r,g,b = (v-c), 0,0,0
    if h < 1     then r,g,b = c,x,0
    elseif h < 2 then r,g,b = x,c,0
    elseif h < 3 then r,g,b = 0,c,x
    elseif h < 4 then r,g,b = 0,x,c
    elseif h < 5 then r,g,b = x,0,c
    else              r,g,b = c,0,x
    end return (r+m)*255,(g+m)*255,(b+m)*255
end

But the main thing about those two functions is the saveColor(name of color,r,g,b) and then you can do stuff like restoreColor('red') and restoreColor('brown')

[raidho36]

Then how about replace that with "createColor" and "reuseColor"?

[Ranguna259]

Sure, what are your ideas ?

[Germanunkol]

Well, I think it's nice that it lets you use names and associate them with colors.

Even if that's very simple to do as well, this library, or at least the idea behind it, can come in handy when using lots of color switches.

[raidho36]

If I was doing it, I'd made it like that:

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--color.lua
local _r = { }
local _g = { }
local _b = { }
local _a = { }

function loadColors ( colors )
    for col, tbl in pairs ( colors ) do
        _r[ col ] = tbl[ 1 ]
        _g[ col ] = tbl[ 2 ]
        _b[ col ] = tbl[ 3 ]
        _a[ col ] = tbl[ 4 ] or 255
    end
end

function newColor ( color, r, g, b, a )
    if b then    
        _r[ color ] = r
        _g[ color ] = g
        _b[ color ] = b
        _a[ color ] = a or 255
    else
        _r[ color ], _g[ color ], _b[ color ], _a[ color ] = love.graphics.getColor ( )
    end
end

function useColor ( color )
    love.graphics.setColor ( _r[ color ], _g[ color ], _b[ color ] )
end

function useColorAlpha ( color )
    love.graphics.setColor ( _r[ color ], _g[ color ], _b[ color ], _a[ color ] )
end

[Ranguna259]

How about this:

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--color.lua
local _r = { }
local _g = { }
local _b = { }
local _a = { }

function loadColors ( colors )
    for col, tbl in pairs ( colors ) do
        _r[ col ] = tbl[ 1 ]
        _g[ col ] = tbl[ 2 ]
        _b[ col ] = tbl[ 3 ]
        _a[ col ] = tbl[ 4 ] or 255
    end
end

function newColor ( color, r, g, b, a )
	if not color then
		color='FastColor'
	end
	if b then   
		_r[ color ] = r
		_g[ color ] = g
		_b[ color ] = b
		_a[ color ] = a or 255
	else
		_r[ color ], _g[ color ], _b[ color ], _a[ color ] = love.graphics.getColor ( )
	end
end

function useColor ( color, alpha )
	if not color then
		color='FastColor'
	end
	if alpha~=true then
		love.graphics.setColor ( _r[ color ], _g[ color ], _b[ color ] )
	else
		love.graphics.setColor ( _r[ color ], _g[ color ], _b[ color ], _a[ color ] )
	end
end

exemple code:

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require 'color'
function love.load()
	 newColor('white',255,255,255)
	 newColor('black',0,0,0)
	 newColor('magenta',255,0,255,100)
end
function love.draw()
	 love.graphics.setColor(255,0,0)
	 newColor()
	 love.graphics.print('red',10,10)
	 useColor('white')
	 love.graphics.print('white',10,25)
	 useColor('magenta')
	 love.graphics.print('magenta',10,40)
	 useColor('magenta',true)
	 love.graphics.print('alphaed magenta',10,55)
	 useColor()
	 love.graphics.print('red again',10,70)
	 useColor('black')
	 love.graphics.print("can't see me",10,85)
end

FastColor is fast load reload, like SaveRestor