LÖVE

Posted: **Mon Dec 29, 2014 6:40 pm**

Hello boys and girls!
I have a question(s) about the canvas example (see link below):

1.

love.graphics.setCanvas(canvas)

Why does canvas appear again inside the parentheses?

2.

Code: Select all

love.graphics.setBlendMode('alpha')

What's this line of code used for? and why should someone use it?

I thank you for your time and happy new year!

And yes I have checked the wiki thoroughly.
https://www.love2d.org/wiki/canvas

[EDIT]

thanks for clearing it up for me but I now have some new questions.
I would make another thread about it but I think that the new questions I have are similar to each other.

1. A mentor of mine said that canvases draws it to an offscreen object (let's call it canvas object) and that got me thinking:
Does the canvas function work like like a layer in Photoshop?
You have this canvas object on the screen that you collect everything on and if you want you can erase it to start a new one.
(Let me know if you want me to clear it up what I mean with it)

2. I have played around with the example for a while and started to see some similarities with something:

Code: Select all

--Does this:
love.graphics.setCanvas(canvas)
love.graphics.setCanvas()

--work similar to:

function love.draw()
end

To clear it up:
does setCanvas(canvas) and setCanvas() work like a function within a function? like what I did in a example function love.draw() and end.
Am right? or am I way wrong?

Posted: **Mon Dec 29, 2014 7:25 pm**

1.) canvas is a variable passed to the function known as love.graphics.setCanvas. if you do not understand that you need to read up on lua some more.

2.) Did you read the documentation for love.graphics.setBlendMode? It's explained there and in the links on that page.

Posted: **Mon Dec 29, 2014 7:37 pm**

S0lll0s wrote:1.) canvas is a variable passed to the function known as love.graphics.setCanvas. if you do not understand that you need to read up on lua some more.

2.) Did you read the documentation for love.graphics.setBlendMode? It's explained there and in the links on that page.

1. I guess you're right that I need to read up on Lua, might as well order a book about it as I find reading on my laptop distracts me.

2. I did read it and I tried out the example and from what I understand is that you can draw a colour on screen and then you can change it so that you can make the colour darker or lighter, am I correct.

It might sound like kinda stupid questions but I just want more in depth knowledge on what it does and to me adding the word canvas within parentheses is to me unlogical unless I have a proper explanation to why it's there.

Posted: **Mon Dec 29, 2014 8:55 pm**

This example probably makes some more sense. applePie is now the name of the canvas.

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applePie = love.graphics.newCanvas(1920,1080)
love.graphics.setCanvas(applePie)

Posted: **Mon Dec 29, 2014 9:09 pm**

Evine wrote:This example probably makes some more sense. applePie is now the name of the canvas.
Code: Select all
applePie = love.graphics.newCanvas(1920,1080)
love.graphics.setCanvas(applePie)

I think I understand it better now, you can name the function what you want but this:

Code: Select all

love.graphics.newCanvas

needs to be inside for the function to work.

Am I right or completely off?

Posted: **Mon Dec 29, 2014 9:50 pm**

Best explained in code. (untested but i think it should work)

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function love.load()
    applePie = love.graphics.newCanvas(1920,1080)  -- Creates canvas
end

function love.draw()
    --Draw to screen
    love.graphics.setCanvas(applePie)
    --Draw to canvas
    love.graphics.setCanvas() -- setCanvas without arguments to go back to drawing to screen
    --Draw to screen
end

Posted: **Tue Dec 30, 2014 11:42 am**

Evine wrote:Best explained in code. (untested but i think it should work)

Code: Select all

function love.load()
    applePie = love.graphics.newCanvas(1920,1080)  -- Creates canvas
end

function love.draw()
    --Draw to screen
    love.graphics.setCanvas(applePie)
    --Draw to canvas
    love.graphics.setCanvas() -- setCanvas without arguments to go back to drawing to screen
    --Draw to screen
end

I'll take a look at it, thanks!

Posted: **Tue Dec 30, 2014 1:24 pm**

nice wrote:
Evine wrote:This example probably makes some more sense. applePie is now the name of the canvas.
Code: Select all
applePie = love.graphics.newCanvas(1920,1080)
love.graphics.setCanvas(applePie)
I think I understand it better now, you can name the function what you want but this:
Code: Select all
love.graphics.newCanvas
needs to be inside for the function to work.

Am I right or completely off?

You don't name The function. The function name is in front of the parenthesis, everything in between are the parameters.

Posted: **Tue Dec 30, 2014 2:17 pm**

S0lll0s wrote: You don't name The function. The function name is in front of the parenthesis, everything in between are the parameters.

Quick correction

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applepie = love.graphics.newCanvas

does create a variable called "applepie" that in a way is an alternative name for the function, but

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applepie = love.graphics.newCanvas(<params>)

actually calls the function, and if it returns something, that will be put into applepie; a new canvas in this case.

LÖVE

[EDITED]Quick question about the canvas example

[EDITED]Quick question about the canvas example

Re: [QUESTION]Quick question about the canvas example

Re: [QUESTION]Quick question about the canvas example

Re: [SOLVED]Quick question about the canvas example

Re: [SOLVED]Quick question about the canvas example

Re: [SOLVED]Quick question about the canvas example

Re: [SOLVED]Quick question about the canvas example

Re: [SOLVED]Quick question about the canvas example

Re: [SOLVED]Quick question about the canvas example