Sanity check/question about a lesson...

[Wolfsong]

For this lesson here:

http://www.leadwerks.com/werkspace/page/tutorials/_/loops-r17

 

I want to see if I'm understanding something right. Though the lesson is about loops (which I do understand) I'm particularly interested in the bits about creating a Window and then a Context (which I'm not sure I understand).

 

------------

 

--Create a window

window = Window:Create()

 

--Create a rendering context

context = Context:Create(window)

 

--While loop

while window:KeyHit(Key.Escape)==false do

 

--Set the drawing color and clear the screen

context:SetColor(0,0,0)

context:Clear()

 

--Set the drawing color and blend mode

context:SetColor(1,1,1)

context:SetBlendMode(Blend.Alpha)

 

--Draw some text onscreen

context:DrawText("PRESS ESCAPE TO END THE PROGRAM.",2,2)

 

--Update the screen

context:Sync()

end

 

---------------

 

So, in this example, are we creating a Window which is then identified as 'window' - and then the Window ('window') is being assigned as the Context or "focus" of the following instructions?

 

So, using 'context:SetColor(0,0,0) would be the same as using window:SetColor(0,0,0)?

 

Am I understanding that right?

 

If so (or even if not), why would the line:

while window:KeyHit(Key.Escape)==false do

 

not be:

while context:KeyHit(Key.Escape)==false do

 

?

 

Or is hitting the Escape Key something that can only refer directly to 'window' as that relates directly to the actual Window, and not to 'context', since that relates to the variable 'window'?

 

Hopefully I explained that well lol.

 

 

Anyway, thanks!

 

Edit: Tried to place the code inside Code tags, but it ended up adding a ton of color tags.

Edited December 31, 2016 by Wolfsong

[Genebris]

Context and Window are different classes, SetColor is a method of Context class:

http://www.leadwerks.com/werkspace/page/api-reference/_/context/

KeyHit is in Window class:

http://www.leadwerks.com/werkspace/page/api-reference/_/window/

 

That's why you can't use KeyHit on context and SetColor on window.

[Wolfsong]

Ahhh I see. So creating a 'context' is creating the viewport inside the window. Got it.

 

Thanks!

[Rick]

Context is more like your gfx context. That doesn't take input. A window takes input and handles it while a gfx context handles drawing stuff.