Game of Life for TI-Nspire

life.lua

--[[
The MIT License (MIT)

Copyright (c) 2015 Oskar Sveinsen

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
]]--

pause = true
editMode = false

period = 0.1
pix_width = 16
pix_height = 16
width = 0
height = 0
grid = {}

menu = {
	{"Edit", edit},
	{"Clear", clear},
	"-",
	{"Resize", resize},
	{"Adjust speed", speed}
}

function on.draw(gc)

end

function on.timer()

end

function on.escapeKey()
	if pause then
		timer.start(period)
	else
		timer.stop()
	end
end

function on.mouseDown(x, y)
	if editMode then
		-- flip pixel
		grid[x / pix_width][y / pix_height] = not grid[x / pix_width][y / pix_height]
	else
		-- skip tick
	end
end

function on.charIn(char)
	if char == "+" then
		period = period - 0.01
	else if char == "-" then
		period = period + 0.01
	else if char == "*" then
		period = period - 0.1
	else if char == "/" then
		period = period + 0.1
	end
	timer.start(period)
end

function on.save()

end

function on.restore(state)

end

function edit()

end

function clear()

end

function resize()
	math.eval("Request \"Pixel width:\",pixel_width")
	pixel_width = var.recall("pixel_width")
	math.eval("Request \"Pixel height:\",pixel_height")
	pixel_height = var.recall("pixel_height")
	math.eval("Request \"Grid width (0 = auto):\",width")
	width = var.recall("width")
	math.eval("Request \"Grid height (0 = auto):\",height")
	height = var.recall("height")
end

function speed()
	math.eval("Request \"Seconds per tick:\",period")
	period = var.recall("period")
end