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Lua and JavaScript

Scripting Tutorial - Lesson 10.4: Putting It All Together

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
		local type = 1

function drawArray(number, x, y, length, height, gc)
			if type == 1 then
				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
			elseif type == 2 then
				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
			else
				gc:drawLine(x, y, x + length * (number+1) - length, y )
				gc:drawLine(x + length * number, y, x + length * number, y + height * number)

for k = 1, number do
					for m = k, number do
						gc:drawLine(x + length*(m-1), y + height * m, 
									x + length * number, y + height * m)
						gc:drawLine(x + length * (k-1), y, 
									x + length * (k-1), y + height * k)
					end
				end
			end
		end

function drawCircles(number, x, y, length, height, gc)
			if type == 1 then
				for k = 0, number - 1 do
					for m = 0, number - 1 do
						gc:fillArc(x + length * m,y + height * k, length, height, 0, 360)
					end
				end
			elseif type == 2 then
				for k = 0, number - 1 do
					for m = 0, number do
						gc:fillArc(x + length * m,y + height * k, length, height, 0, 360)
					end
				end
			else
				for k = 0, number - 1 do
					for m = k, number - 1 do
						gc:fillArc(x + length * m,y + height * k, length, height, 0, 360)
					end
				end
			end
		end

function on.arrowKey(key)
			if key == "left" then
				type = type % 3 - 1
			elseif key == "right" then
				type = type % 3 + 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 + 2) * yval / 2

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

As you will see, the arrow key responses in this environment can be touchy! Enough, though, to get a taste of the possibilities! Fortunately, when we introduce classes in the next section of these tutorials, we learn a much better way to control actions!

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