Hello all,
Just thought I’d show what I have for a button class that uses sprites and open it up for improvements or suggestions. Anything would be appreciated. I used some methods from @Reefwing’s button tutorial. I hope it’s all right
Button = class()
function Button:init(btnNorm,btnSel,x,y)
self.pos = vec2(x,y)
self.btnNorm = btnNorm
self.btnSel = btnSel
self.selected = false
self.action = nil
self.w,self.h = spriteSize(self.btnNorm)
end
function Button:draw()
if self.selected == true then
sprite(self.btnSel,self.pos.x,self.pos.y,self.w,self.h)
elseif self.selected == false then
sprite(self.btnNorm,self.pos.x,self.pos.y,self.w,self.h)
end
end
function Button:touched(touch)
if touch.state == BEGAN or touch.state == MOVING then
if math.abs(self.pos.x - touch.x) <= (self.w/2)
and math.abs(self.pos.y - touch.y) <= (self.h/2) then
self.selected = true
else
self.selected = false
end
elseif touch.state == ENDED then
if self.selected == true and self.action then
self.action()
end
self.selected = false
end
end
And here’s a little example
-- Use this function to perform your initial setup
function setup()
print("Hello World!")
button = Button("Planet Cute:Chest Closed","Planet Cute:Chest Open",WIDTH/2,HEIGHT/2)
button.action = function() buttonPressed() end
end
function draw()
-- This sets a dark background color
background(40, 40, 50)
button:draw()
end
function buttonPressed()
print("Button pressed")
end
function touched(touch)
button:touched(touch)
end
EDIT: Juuuuuust kidding.
Again, any improvements or suggestions are more than welcome.
@ChrisF - copying the examples and extending or improving the code is exactly what it is there for. @Simeon wrote the button class, I was just explaining how it works. I will link in this post from the Tutorial so that other people learning can see another approach. That is the beauty of coding, there are lots of ways to skin that cat and the search for the most elegant solution is never ending.
However, you do raise an interesting point. Is the code on these forums and elsewhere released under any particular licence? I’m assuming it is the DWTHYLWMCJDSM licence (Do What The Hell You Like With My Code Just Don’t Sue Me) but perhaps it should be explicitly stated somewhere (if it isn’t already). There is probably not too much code being written to run Nuclear Reactors using Codea (yet), so the risk is low but nevertheless…
Thanks ChrisF, thats what I was looking for. i extended the code a bit to have a matrix of buttons, e.g. As level selector. Maybe its useful for somebody:
Button = class()
function Button:init(btnNorm,btnSel,x,y,sizex, sizey)
self.pos = vec2(x,y)
self.btnNorm = btnNorm
self.btnSel = btnSel
self.selected = false
self.action = nil
--self.w,self.h = spriteSize(self.btnNorm)
self.w = sizex
self.h = sizey
end
function Button:draw()
if self.selected == true then
sprite(self.btnSel,self.pos.x,self.pos.y,self.w,self.h)
elseif self.selected == false then
sprite(self.btnNorm,self.pos.x,self.pos.y,self.w,self.h)
end
end
function Button:touched(touch)
if touch.state == BEGAN or touch.state == MOVING then
if math.abs(self.pos.x - touch.x) <= (self.w/2)
and math.abs(self.pos.y - touch.y) <= (self.h/2) then
self.selected = true
else
self.selected = false
end
elseif touch.state == ENDED then
if self.selected == true and self.action then
self.action()
end
self.selected = false
end
end
-- Use this function to perform your initial setup
function setup()
buttons = {}
local button
xPos = 100
for x = 1, 7 do
yPos = 100
for y = 1, 5 do
button = Button("Planet Cute:Chest Closed","Planet Cute:Chest Open",xPos, yPos, 70, 70)
button.action = function() buttonPressed(x, y) end
table.insert(buttons, button)
yPos = yPos + 80
end
xPos = xPos + 80
end
end
function draw()
-- This sets a dark background color
background(40, 40, 50)
for i = 0, table.maxn(buttons) do
if buttons[i] == nil then
else
buttons[i]:draw()
end
end
end
function buttonPressed(x, y)
print(string.format("Button pressed %i, %i", x, y))
end
function touched(touch)
for i = 0, table.maxn(buttons) do
if buttons[i] == nil then
else
buttons[i]:touched(touch)
end
end
end
Nice! With your ideas, I would like to do something like letting out of the treasure box a sprite for using it later, like position it on different places any time… But I’m a newbie… and I hope I’ll find the way soon.
-- Star selection matox
--
-- Use this function to perform your initial setup
function setup()
show1 = 0
show2 = 0
show3 = 0
show4 = 0
a = 0; c = 0
b = 0; d = 0
e = 0; f = 0
hit = 0
rects = {}
w,h = spriteSize("SpaceCute:Star")
for i = 1, 4 do
rects[i] = {}
rects[i].x = 100 * i * 1.5
rects[i].y = 200
rects[i].id = i
rects[i].p = math.random(100)
end
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)
-- Do your drawing here
drawSprite()
font("Georgia")
fontSize(50)
fill(255)
text("1. Player 2. Player", 300, 700)
text(show1,150,600)
text(show2,450,600)
text(show3,150,500)
text(show4,450,500)
line(100,450,700,450)
text(e,150,400)
text(f,450,400)
end
function drawSprite()
for i = 1, #rects do
sprite("SpaceCute:Star", rects[i].x,rects[i].y,80,100)
end
end
function touched(touch)
local TouchX = CurrentTouch.x
local TouchY = CurrentTouch.y
if touch.state == ENDED then
local toRemove = {}
for i = 1, #rects do
if TouchX >= (rects[i].x - (w/2))and
TouchX <= (rects[i].x + (w/2)) and
TouchY >= (rects[i].y - (h/2)) and
TouchY <= (rects[i].y + (h/2)) then
print(rects[i].id,rects[i].p)
hit = hit + 1
if hit ==1 then
show1 = (rects[i].p)
elseif hit == 2 then
show2 = (rects[i].p)
elseif hit == 3 then
show3 = (rects[i].p)
elseif hit == 4 then
show4 = (rects[i].p)
end
a = show1
b = show2
c = show3
d = show4
e = a + c
f = b + d
table.insert(toRemove, i)
end
end
for i = 1, #toRemove do
table.remove(rects,toRemove[i])
end
end
end
Hi great class, thank all of you for your efforts.
I have a question for the main section, how would one go about if you wanted to keep the chest open for a certain amount of time/frames before it changes back to the closed chest?
