Before you rotate your ship, you push matrix and then when done, popmatrix. This is how you keep everything from rotating I think…
.@D4rk_Code - Asteroids is a good beginner project. I would suggest you use meshes for the graphics.
I will be extending my SpaceWar! game tutorial with physics at some stage so the ships are attracted toward the sun in the centre of the screen.
In the meantime, if you want to look at another Asteroids version check out @juaxix’s version at: http://twolivesleft.com/Codea/Talk/discussion/114/asteroides-source-code#Item_21
I tried this version, and to be honest I don’t like it; controls horrendously for me…now the Spacewar! game, I like the tutorials so far, though they have all confused me to death, I believe I might use your triangle ship mesh for the ships if I can’t get the one that wrmichael drew me to animate, in the mean time I’m also working on an Enduro port for the Casio Prizm 
With permission of course hahha!
Oh well I have a minimal level of understanding, but I guess I don’t fully understand how what you’re doing works
Also, I"m super bogged down at college so Developing this asteroids will be slowish, help is welcomed, and hopefully a link with the code will be available soon (week or 2)
I have been playing. I have a ship, two buttons. No throttle or firing yet… Just spinning
Button = class()
-- Fast Mesh Button Class courtesy of @Vega
-- 3 Aug 2012
--
-- Modified: - Call Back Functionality added
-- - pushStyle() & popStyle() added to draw()
-- - tapped status added
-- - pointInRect() function added
-- - changed vec2 location to x and y (to reduce typing!)
--
-- Version 1.3 (4 Aug 2012)
function Button:init(text,x,y,width,height)
self.state = "normal"
self.text = text
self.textColor = color(255,255,255,192)
self.x = x
self.y = y
self.width = width
self.height = height
self.visible = true
self.fontSize = 28
self.font = "ArialRoundedMTBold"
self.color1 = color(255, 255, 255, 96)
self.color2 = color(128,128,128,32)
self.presscolor1 = color(192, 224, 224, 128)
self.presscolor2 = color(96, 192, 224, 128)
self.verts = self:createVerts(self.width, self.height)
self.myMesh = mesh()
self.myMesh.vertices = triangulate(self.verts)
self.vertColor = {}
self:recolor()
self.action = nil
self.tapped = false
self.actionpress= false
self.istouched = false
end
function Button:setColors(c1,c2,p1,p2)
self.color1 = c1
self.color2 = c2
self.presscolor1 = p1
self.presscolor2 = p2
self:recolor()
end
function Button:textOptions(fn, sz, col)
self.font = fn
self.fontSize = sz
self.textColor = col
end
function Button:draw()
if self.visible == true then
pushStyle()
pushMatrix()
translate(self.x,self.y)
self.myMesh:draw()
fill(self.textColor)
fontSize(self.fontSize)
font(self.font)
text(self.text, self.width/2,self.height/2)
self:drawLines(self.verts)
popMatrix()
popStyle()
if self.istouched then
if self.actionpress then
if self.action then
self.action()
end
end
end
end
end
function Button:touched(touch)
self.tapped = false
if self.visible then
if pointInRect(touch.x, touch.y, self.x, self.y, self.width, self.height) then
if touch.state == BEGAN then
self.tapped = true
self.state = "pressing"
self:recolor()
self.istouched = true
elseif touch.state == ENDED then
if self.state == "pressing" then
self.state = "normal"
self.tapped = true
self:recolor()
end
if self.actionpress == false then
if self.action then
self.action()
actiontook = true
end
end
self.istouched = false
end
else
self.state = "normal"
self:recolor()
end
end
if touch.state == ENDED then
self.istouched = false
end
end
function Button:createVerts(w,h)
local r
local v = {}
if w > 100 or h > 100 then
if w>=h then r = math.round(h/100) else r = math.round(w/100) end
else
r = 1
end
v[1] = vec2(w,6*r)
v[2] = vec2(w-r,4*r)
v[3] = vec2(w-2*r,2*r)
v[4] = vec2(w-4*r,r)
v[5] = vec2(w-6*r,0)
v[6] = vec2(6*r,0)
v[7] = vec2(4*r,r)
v[8] = vec2(2*r,2*r)
v[9] = vec2(r,4*r)
v[10] = vec2(0,6*r)
v[11] = vec2(0,h-6*r)
v[12] = vec2(r,h-4*r)
v[13] = vec2(2*r,h-2*r)
v[14] = vec2(4*r,h-r)
v[15] = vec2(6*r,h)
v[16] = vec2(w-6*r,h)
v[17] = vec2(w-4*r,h-r)
v[18] = vec2(w-2*r,h-2*r)
v[19] = vec2(w-r,h-4*r)
v[20] = vec2(w,h-6*r)
return v
end
function Button:drawLines(v)
noSmooth()
strokeWidth(1)
stroke(0, 0, 0, 192)
for i=1, #v-1 do
line(v[i].x,v[i].y,v[i+1].x,v[i+1].y)
end
line(v[#v].x,v[#v].y,v[1].x,v[1].y)
end
function Button:recolor()
local lt, dk
if self.state == "normal" then
lt = self.color1
dk = self.color2
else
lt = self.presscolor1
dk = self.presscolor2
end
for i=1,3 * #self.verts - 6 do
if self.myMesh.vertices[i].y > self.height/2 then
self.vertColor[i] = lt
else
self.vertColor[i] = dk
end
end
self.myMesh.colors = self.vertColor
end
-- Math Utilities
function math.round(value)
-- math.round function courtesy of Vega.
return math.floor(value + 0.5)
end
function pointInRect(pointX, pointY, x, y, w, h)
-- Returns true if point (pointX, pointY) is within the rectangle
-- with lower left corner at (x, y) with a width of w and a
-- height of h.
--
-- Reefwing Software (www.reefwing.com.au)
-- Version 1.0
if pointX >= x and pointX <= x + w and pointY >= y and pointY <= y + h then
return true
else
return false
end
end
-- main asteroids
shipr =0
-- Use this function to perform your initial setup
function rotateleft()
shipr = shipr + 10
if shipr >= 360 then
shipr = 0
end
end
function rotateright()
shipr = shipr - 10
if shipr <= 0 then
shipr = 360
end
end
function setup()
-- print("Hello World!")
x = 10
as = Asteroids()
local shipr =0
btn = Button("<=",100,100,100,50)
btn.action = function ()
--shipr = shipr +10
rotateleft()
-- print(shipr)
end
btn.actionpress = true
btn2 = Button("=>",300,100,100,50)
btn2.action = function ()
--shipr = shipr +10
rotateright()
-- print(shipr)
end
btn2.actionpress = true
cs = {}
table.insert(cs,btn)
table.insert(cs,btn2)
table.insert(cs,as)
end
-- This function gets called once every frame
function draw()
-- This sets a dark background color
background(40, 40, 50)
-- This sets the line thickness
strokeWidth(5)
pushMatrix()
translate(HEIGHT/2,WIDTH/2)
-- Draw our triangle invader
-- 60 pixels high, 40 pixels wide
-- print("sr:"..shipr)
rotate(shipr)
line( 0, 30, 20, -30 )
line( 0, 30,-20, -30 )
line( -20, -30, 20, -30 )
x = x + 10
-- Do your drawing here
popMatrix()
-- sprite(img,200,200,50,50)
for a,control in pairs(cs) do
control:draw()
end
end
function touched(touch)
for a,control in pairs(cs) do
control:touched(touch)
end
end
Asteroids = class()
function Asteroids:init()
-- you can accept and set parameters here
self.x = 600
self.y = 50
self.w = 50
self.h = 50
img = image(8, 8)
img:set(1,4,0,255,0,255)
img:set(1,5,0,255,0,255)
img:set(1,6,0,255,0,255)
img:set(2,1,0,255,0,255)
img:set(2,2,0,255,0,255)
img:set(2,3,0,255,0,255)
img:set(2,4,0,255,0,255)
img:set(2,5,0,255,0,255)
img:set(2,6,0,255,0,255)
img:set(2,7,0,255,0,255)
img:set(3,1,0,255,0,255)
img:set(3,2,0,255,0,255)
img:set(3,3,0,255,0,255)
img:set(3,4,0,255,0,255)
img:set(3,5,0,255,0,255)
img:set(3,6,0,255,0,255)
img:set(3,7,0,255,0,255)
img:set(4,1,0,255,0,255)
img:set(4,2,0,255,0,255)
img:set(4,3,0,255,0,255)
img:set(4,4,0,255,0,255)
img:set(4,5,0,255,0,255)
img:set(4,6,0,255,0,255)
img:set(4,7,0,255,0,255)
img:set(5,1,0,255,0,255)
img:set(5,2,0,255,0,255)
img:set(5,3,0,255,0,255)
img:set(5,4,0,255,0,255)
img:set(5,5,0,255,0,255)
img:set(5,6,0,255,0,255)
img:set(5,7,0,255,0,255)
img:set(6,2,0,255,0,255)
img:set(6,3,0,255,0,255)
img:set(6,4,0,255,0,255)
img:set(6,5,0,255,0,255)
img:set(6,6,0,255,0,255)
img:set(6,7,0,255,0,255)
img:set(7,3,0,255,0,255)
img:set(7,4,0,255,0,255)
img:set(7,5,0,255,0,255)
img:set(7,6,0,255,0,255)
self.mysprite = img
end
function Asteroids:draw()
-- Codea does not automatically call this method
sprite(self.mysprite,self.x,self.y)
end
function Asteroids:touched(touch)
-- Codea does not automatically call this method
end
Thanks! The button class is telling me it expects a table and gets a nil value so it’s broke, I’ll keep the asteroids one! I’m looking into physics today, as I got a day off school
does the button class give you a line the error is on? it should work… I can rotate left and right in my little app.
I have each class in its own code window. I merged them together for simplicity of cut and paste.
Hello World!
error: error: [string “Button = class()…”]:277: bad argument #1 to ‘pairs’ (table expected, got nil)
Pausing playback
At – main is where the main program is. Maybe but the button class into its own code window?
Everything is its own class, I have main, asteroids, button, and soon probably ship
Freeze, Space Police!
I assume you made a copy-and-paste error. It may not be immediately obvious as many of your own code is badly formatted. So if I may make a suggestion …
Apart from that: Make sure you have a function setup() that gets called and that it looks like this:
function setup()
. . .
cs = {}
table.insert(cs, btn)
table.insert(cs, btn2)
table.insert(cs, as)
end
There you have it, a table named cs to pass it to pairs.
Attempting the grafting now.