Gange font color

[ishkabible]

how do you change font color, i can seem to figure this one out looking though the documentation. it always shows up white.

[nevon]

Code: Select all

function love.draw()
    love.graphics.setColor(255,0,0)
    love.graphics.print("Red text", x, y)
    love.graphics.setColor(0,0,0,127)
    love.graphics.print("Black text at 50% opacity", x, y)
end

[ishkabible]

thanks, i had tired that before but nothing happened. i changed color mode this time to modulate before i called print then i changed it back to replace to achieve the effect i wanted

[TechnoCat]

Code: Select all

function love.draw()
    love.graphics.setColor(255,0,0)
    love.graphics.print("Red text", x, y)
    love.graphics.setColor(0,0,0,127)
    love.graphics.print("Black text at 50% opacity", x, y)
end

I think it is worth noting that the color isn't cleared between callback calls.

Code: Select all

function love.draw()
    love.graphics.print("TEXT ONE", x, y)
    love.graphics.setColor(255,0,0)
    love.graphics.print("TEXT TWO", x, y)
    love.graphics.setColor(0,0,0,127)
    love.graphics.print("TEXT THREE", x, y)
end

Will print:

Code: Select all

(love.draw() call 1)
TEXT ONE (white opaque)
TEXT TWO (red opaque)
TEXT THREE (black half opaque)
(love.draw() call 2)
TEXT ONE (black half opaque)
TEXT TWO (red opaque)
TEXT THREE (black half opaque)
(love.draw() call 3)
TEXT ONE (black half opaque)
TEXT TWO (red opaque)
TEXT THREE (black half opaque)
...

Essentially making TEXT ONE and TEXT THREE the same color when it wraps around.

So some people might opt to put a love.setColor(255,255,255,255) at the beginning of love.draw()
Then:

Code: Select all

function love.draw()
    love.graphics.setColor(255,255,255,255)
    love.graphics.print("TEXT ONE", x, y)
    love.graphics.setColor(255,0,0)
    love.graphics.print("TEXT TWO", x, y)
    love.graphics.setColor(0,0,0,127)
    love.graphics.print("TEXT THREE", x, y)
end

Will print:

Code: Select all

(love.draw() call 1)
TEXT ONE (white opaque)
TEXT TWO (red opaque)
TEXT THREE (black half opaque)
(love.draw() call 2)
TEXT ONE (white opaque)
TEXT TWO (red opaque)
TEXT THREE (black half opaque)
...

[ishkabible]

another thing i have not been able to find is how to change the alpha of an image when displayed without changing the color of the whole image aslo

[TechnoCat]

another thing i have not been able to find is how to change the alpha of an image when displayed without changing the color of the whole image aslo

if you keep the color as white, (255,255,255,alpha), and just change alpha, that should work to make images transparent.
I believe this is assuming your blending mode is default. Not too sure if changing the blending mode will change this.

Here is an example

Code: Select all

function love.load()
  image = love.graphics.newImage("girl.jpg")
  color = {}
  color.r = 255
  color.g = 255
  color.b = 255
  color.a = 255
end

function love.update(dt)
  color.a = color.a - dt*40
  if color.a < 0 then
    color.a = 255
  end
end

function love.draw()
  love.graphics.setColor(255,255,255,255)
  love.graphics.print("I am hidden text!", 0,0)
  love.graphics.setColor(color.r,color.g,color.b,color.a)
  love.graphics.draw(image, 0,0)
end

[ishkabible]

yep it worked, love is amazing, the productivity is astounding compared to what i have used in the past.

[Jasoco]

Does using SetColor and SetFont a lot slow down Löve at all? Or is there no impact at all on speed and no reason to optimize the code to reduce color/font calls?

[thelinx]

Does using SetColor and SetFont a lot slow down Löve at all? Or is there no impact at all on speed and no reason to optimize the code to reduce color/font calls?

Technically, it shouldn't.

The fonts are loaded into memory anyway and the colour is only used while drawing. The only overhead would probably be setting a C variable.

[Jasoco]

Good to know! Thanks. I was afraid calling them a lot would slow things down.