A tutorial

A tutorial

Starting

require('space',sp)

sp.init(600,450)
function main()
	while(true)
		//drawing
		sp.rect(0,0,50,50)
		//refresh screen
		sp.refresh()
		//other
		sp.get(_)
main()

First, init initializes the library with a 600x450 window.

It's good practice to make a main function in which to encase the loop for our game (or simulation, UI, etc).

In main, we use sp.rect(0,0,50,50) to draw a rectangle and then refresh the screen. We'll get to sp.get later.

See: what is a relation?

Moving a Rectangle

function main()
	init x=0
	while(true)
		//drawing
		clear()
		sp.setRGB(0,0,0)
		sp.rect(x,0,50,50)
		sp.refresh()
		//get events
		sp.get(_)
		sp.delay(50)
		//update
		next x=x+1

Now, we set the rectangle to move by 1 pixel each time. It's important to clear the area to be drawn and then refresh to get the result in the screen. We also set the RGB value of the rectangle.

For good measure, we use delay to give some time between each loop.

Declarative programming

Our framework is unique in that it uses logic programming and temporal logic.

As a logic programming framework, actions have to be described.

function main()
	init x=0
	while(true)
		...
		next x=x+1

Hence, we state that our rectangle's x coordinate starts at 0 and that the number increases by 1 each time. This is easily done with the init and next keywords.

About

Cosmos and Space is open-source. Anyone can contribute to the project. It's given without any warranty.