Hello all,
I’ve been working on a small project recently, which I hope to eventually turn into a cellular automata simulation. Right now it’s just a grid of squares that you can turn on or off by touching and I’d like to be able to change their values in the code too, but I can’t. Only the touched function seems to have this permission.
I tried changing it directly in the console, and then i tried making a function to do it, which works fine when called by touched, but nothing’s working and it’s really frustrating.
My code is below:
-- cells
local gridWidth = 10
local gridHeight = 10
local cellSize = 50/1080
local margin = 10
local startX = (WIDTH - (gridWidth * (cellSize + margin) - margin)) / 2
local startY = (HEIGHT - (gridHeight * (cellSize + margin) - margin)) / 2
local onColour = color(0, 255, 0)
local offColour = color(255)
local bgColour = color(40, 40, 50)
grid = {}
for i = 1, gridWidth do
grid[i] = {}
for j = 1, gridHeight do
grid[i][j] = false
end
end
-- Use this function to perform your initial setup
function setup()
print("Hello Automata!")
viewer.mode = OVERLAY
noSmooth()
end
function touched(touch)
if touch.state == BEGAN then
local i = math.floor((touch.x - startX) / (cellSize + margin)) + 1
local j = math.floor((touch.y - startY) / (cellSize + margin)) + 1
if i >= 1 and i <= gridWidth and j >= 1 and j <= gridHeight then
cell(i,j)
end
end
end
-- This function gets called once every frame
function draw()
background(bgColour)
for i = 1, gridWidth do
for j = 1, gridHeight do
if grid[i][j] then
fill(onColour)
else
fill(offColour)
end
rect(startX + (i - 1) * (cellSize + margin), startY + (j - 1) * (cellSize + margin), cellSize, cellSize)
end
end
end
function cell(xIndex,yIndex)
grid[xIndex][yIndex] = not grid[xIndex][yIndex]
print(xIndex,yIndex)
end
@DJMoffinz@sim - modified your code to define variables from within setup() and a number of errors fired up. Added some definitions to the draw() function, but still errors.
Looks like all definitions outside the draw() function are ignored.
What version of Codea are you running in?
-- Template2
-- Use this function to perform your initial setup
function setup()
print("Hello Automata!")
viewer.mode = OVERLAY
noSmooth()
init()
end
function touched(touch)
if touch.state == BEGAN then
local i = math.floor((touch.x - startX) / (cellSize + margin)) + 1
local j = math.floor((touch.y - startY) / (cellSize + margin)) + 1
if i >= 1 and i <= gridWidth and j >= 1 and j <= gridHeight then
cell(i,j)
end
end
end
-- This function gets called once every frame
function draw()
background(0)
gridWidth, gridHeight = 10, 10
for i = 1, gridWidth do
for j = 1, gridHeight do
if grid[i][j] then
fill(onColour)
else
fill(offColour)
end
rect(startX + (i - 1) * (cellSize + margin), startY + (j - 1) * (cellSize + margin), cellSize, cellSize)
end
end
end
function cell(xIndex,yIndex)
grid[xIndex][yIndex] = not grid[xIndex][yIndex]
print(xIndex,yIndex)
end
function init()
--
gridWidth = 10
gridHeight = 10
cellSize = 50/1080
margin = 10
startX = (WIDTH - (gridWidth * (cellSize + margin) - margin)) / 2
local startY = (HEIGHT - (gridHeight * (cellSize + margin) - margin)) / 2
onColour = color(0, 255, 0)
offColour = color(255)
bgColour = color(40, 40, 50)
grid = {}
for i = 1, gridWidth do
grid[i] = {}
for j = 1, gridHeight do
grid[i][j] = false
end
end
end
Edit: oops not had my brain switched on today. Removed local refs from init() and ran as per your initial project but no display. Also, can you have Local defs in global space?
@DJMoffinz Heres something I threw together that might show what you’re trying to do. It was easier to start from scratch then try to get yours to work. Tap a white cell to show a red dot there. If you tap the green cell, it will show a red dot above, below, right, left of it to show that you can update any cell you want besides the one you touch. When you update cells, they should be done either in draw() or a function called from draw().
viewer.mode=FULLSCREEN
function setup()
gridSize=20
cellSize=30
startX=100
startY=100
xx,yy=0,0
center=gridSize//2
end
function draw()
background(0)
-- draw grid
for x=1,gridSize do
for y=1,gridSize do
fill(255)
-- draw green grid at center
if x==center and y==center then
fill(0,255,0)
end
rect(x*cellSize+startX,y*cellSize+startY,cellSize)
end
end
-- draw ellipse up / down / sideways from center if selected
fill(255,0,0)
if xx+yy>0 then
ellipse(xx*cellSize+startX+cellSize/2,yy*cellSize+startY+cellSize/2,10)
if xx==center and yy==center then
drawExtra()
end
end
end
function touched(t)
if t.state==BEGAN then
for x=1,gridSize do
for y=1,gridSize do
x1=x*cellSize+startX
y1=y*cellSize+startY
if t.x>x1 and t.x<x1+cellSize and t.y>y1 and t.y<y1+cellSize then
xx,yy=x,y -- cell touched
end
end
end
end
end
function drawExtra()
for x=1,gridSize do
ellipse(x*cellSize+startX+cellSize/2,center*cellSize+startY+cellSize/2,10)
end
for y=1,gridSize do
ellipse(center*cellSize+startX+cellSize/2,y*cellSize+startY+cellSize/2,10)
end
end
@Bri_G Just looked at it again and the problem is the local cellSize = 50/1080. 50/1080 is .0463 which is really, really small. Change the cellSize to 40 or so and the cells show.
@DJMoffinz Here’s an example for saving info in a table for each cell when touched and it wasn’t already touched.
viewer.mode=FULLSCREEN
function setup()
gridSize=20
cellSize=30
startX=100
startY=100
count=0
tab={} -- table to save each cell info
for x=1,gridSize do
tab[x]={}
for y=1,gridSize do
tab[x][y]=0 -- init to 0, no info
end
end
end
function draw()
background(0)
for x=1,gridSize do
for y=1,gridSize do
fill(255)
rect(x*cellSize+startX,y*cellSize+startY,cellSize)
if tab[x][y]>0 then
fill(255,0,0)
x1=x*cellSize+startX+cellSize/2 -- center x of cell
y1=y*cellSize+startY+cellSize/2 -- center y of cell
text(tab[x][y],x1,y1)
end
end
end
end
function touched(t)
if t.state==BEGAN then
for x=1,gridSize do
for y=1,gridSize do
x1=x*cellSize+startX
y1=y*cellSize+startY
if t.x>x1 and t.x<x1+cellSize and t.y>y1 and t.y<y1+cellSize then
if tab[x][y]==0 then -- update only if cell is blank
count=count+1
tab[x][y]=count -- set cell to count
end
end
end
end
end
end
@Bri_G@dave1707 thanks for your help both of you! I’ve now diagnosed the problem, and it is simply that I was defining all my variables as local. Force of habit ig.
