TI-Nspire Lua Editor: Try Your Own

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Lua and JavaScript

Scripting Tutorial - Lesson 9.1: Square Numbers

Play with the script in the text box below, and then click the "run your code" button above.

platform.apilevel = '1.0'

local screen = platform.window
		local w=screen:width() 
		local h=screen:height() 
		local num = 5

function drawArray(number, x, y, length, height, gc)
			for k = 0, number do
				for m = 0, number do
					gc:drawLine(x,y + height * m,x + length * number,y + height * m)
					gc:drawLine(x + length * k,y,x + length * k,y + height * number)
				end
			end
		end

function on.arrowKey(key)
			if key == "left" then
				num = num - 1
			elseif key == "right" then
				num = num + 1
			elseif key == "up" then
				num = num + 1
			else
				num = num - 1
			end
			screen:invalidate()
		end

function on.mouseUp(x, y)
	        if y < 0.2*h then
	            on.arrowKey("up")
	        elseif y > 0.8*h then
	            on.arrowKey("down")
	        elseif x < 0.2*w then
	            on.arrowKey("left")
	        elseif x > 0.8*w then
	            on.arrowKey("right")
	        end
			screen:invalidate()
	    end

function on.paint(gc)
			w=screen:width() 
			h=screen:height() 
			
			xval = math.floor(w/(num+4))
			yval = math.floor(h/(num+4))

x = w/2 - num * xval / 2
			y = h/2 - num * yval / 2

gc:setPen("thin", "smooth")
			gc:setColorRGB(165,42,42)
			drawArray(num, x, y, xval, yval, gc)
		end

Click "run your code!" to get started.

You can copy and paste the script (or type your own) into the lower text box and then click "run your code!" After that, explore and experiment!

How might you change the script to make the "square" actually appear to be square? Can you do this by changing only a single character?

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