TI-Nspire Lua Editor: Try Your Own

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Lua and JavaScript

Scripting Tutorial - Lesson 9.2 (Rectangular 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 + 1 do
				for m = 0, number do
					gc:drawLine(x,y + height * m,x + length * (number + 1),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 + 1) * 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!

Try now to link the position of the boxes to a variable and use arrow keys to drag the boxes around the Lua window. You may also like to insert a scale variable and use it to control the dimensions of our model.

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