Multiple physics objects

Questions
21

That didn’t work :frowning: out it increased the value infinitely
But I found out a solution I made a table called score and ADDED THIS
And btw “b =nil” didn’t remove the bullet from the table (found out by parameter.watch(“#bullets”) so I also changed that to “table.remove(bullets, 1, b”)

function draw()

    ....other code

    pushStyle()
    fill(0, 0, 0, 255) -- drawing the bullets
    for i,b in pairs(bullets) do
    ellipse(b.x,b.y,10)
        if b.x<1 or b.x>WIDTH or b.y<1 or b.y>HEIGHT then
            table.remove(bullets,1,b)
            table.insert(score, 1)     -- ADDED THIS
        end
    end
    popStyle()

    .....other code....
end

It increased a value in the table since I added only one element ‘1’ by one only and I could find the value using parameter.watch(“#score”)

Now I have one more question.

  1. If I add a value to the table what position is it stored at the last position or the first position or a random position if I haven’t mentioned the position?

  2. if I want to remove a value from the last instead of the first position want should i put in table.remove
    Example table.remove(bullets, ??, b) what should be there for last position

22

Actually, the code below works perfectly for me, in scoring

for i,b in pairs(bullets) do
       if b.x<1 or b.x>WIDTH or b.y<1 or b.y>HEIGHT then
            b:destroy()
            table.remove(bullets,i) 
            score=score+1
       else 
            fill(0)
            ellipse(b.x,b.y,10) 
        end
    end

Lua stores all table values as key-value pairs, in no particular order. It’s too hard to explain this properly in a forum post.

Tables are very important in Codea, so I recommend you look at the Lua documentation, and some tutorials or explanations on the Internet, I have a tutorial as well, which refers to another good one by Reefwing.

23

I dont know why it didnt work for me! This is the whole game till now if you want to check it out not that difficult but okay to pass your time. I’m still building it up but here’s where I’ve reached till


function setup()
    physics.pause()
    physics.gravity(0,0)
    score = {}
    bullets = {}
    number = {}
    ball = {}
    for i = 1,5 do
        ball[i] = Ballons()
    end
    sound(DATA, "ZgBAKgBLQFRAQEBAAAAAAK5T+j46fh4/UwBAf0BAQEBAZEBA")
    parameter.watch("#number")
    parameter.watch("#score")
    t = 300
end

function draw()
    t = t - 1
    if t>=0 then
    background(255, 255, 255, 255)
    pushStyle()
    font("MarkerFelt-Thin")
    fontSize(25)
    fill(0, 199, 255, 255)
    text("no more than 5 lives", WIDTH - 380, HEIGHT - 50)
    text("waste an arrow or miss a balloon and lose a life", WIDTH - 250, HEIGHT - 75)    
    popStyle()
    pushStyle()
    fontSize(100)
    font("SnellRoundhand-Black")
    fill(192, 26, 18, 117)
    text("BALLONS", WIDTH/2, HEIGHT/2)
    popStyle()
    pushStyle()
    font("AmericanTypewriter-Bold")
    fontSize(20)
    text("(inspired by the old windows game)", WIDTH/2, HEIGHT/2 - 75)
    text("game begins in 5 seconds", WIDTH/2,HEIGHT/2 - 95)
    popStyle()
    pushStyle()
    font("MarkerFelt-Thin")
    fontSize(25)
    fill(0, 199, 255, 255)
    text("Touch behined this line to shoot arrows", 350, HEIGHT - 250)
    strokeWidth(3)
    stroke(0, 200, 255, 255)
    lineCapMode(ROUND)
    line(160,HEIGHT-250,75,HEIGHT-250)
    line(75,HEIGHT-250,85,HEIGHT-245)
    line(75,HEIGHT-250,85,HEIGHT-255)
    popStyle()
    pushStyle()
    strokeWidth(2)
    stroke(81, 31, 31, 255)
    line(50,0,50,HEIGHT)
    popStyle()
    end
    if t<= 0 then
        background(255, 255, 255, 255)
        strokeWidth(2)
        stroke(81, 31, 31, 255)
        line(50,0,50,HEIGHT)
        physics.resume()
    end

    if collision~=nil then        ------------------- see note 3. above
        ball[collision[1]].ballon:destroy()   --- see note 2 above
        table.remove(ball,collision[1])
        bullets[collision[2]]:destroy()
        table.remove(bullets,collision[2])
        collision=nil
        table.insert(score,1)
    end

    pushStyle()
    fill(0, 0, 0, 255) -- drawing the bullets
    for i,b in pairs(bullets) do
        sprite("Documents:arrow",b.x - 37,b.y,74)
        if b.x<1 or b.x>WIDTH or b.y<1 or b.y>HEIGHT then
            table.remove(bullets,1,b)
            table.insert(number,1)
        end
    end
    for i,b in pairs(ball) do
        if b.ballon.y>HEIGHT + b.radius then
            b:count()
        end
    end
    popStyle()

    for i,b in pairs(ball) do -- drawing the ballons
        pushStyle()
        fill(b.colr)
        ellipse(b.ballon.x, b.ballon.y, b.radius*2)
    end
        popStyle()
    
    if #number >= 5 then
        pushStyle()
        fill(255, 0, 0, 255)
        font("HoeflerText-BlackItalic")
        fontSize(50)
        text("Game Over", WIDTH/2, HEIGHT/2)
        physics.pause()
        popStyle()
    end
    
    if #ball == 0 then
        for i = 1,5 do
            ball[i] = Ballons()
        end
    end
end

function createBullet()
    local bullet = physics.body(CIRCLE,5)
    bullet.x = x
    bullet.y = y
    bullet.linearVelocity = vec2(750,0)
    bullet.restitution = 0
    bullet.type = DYNAMIC
    bullet.info = "bullet"
    table.insert(bullets,bullet)
end

function touched(touch)
    x = touch.x
    y = touch.y
    if touch.x<=50 then
        if touch.state == BEGAN then
            a = true
            createBullet()
        end
    end
end

function collide(contact) 
    if contact.bodyA.info~=nil and contact.bodyB.info~=nil then
        for i,v in pairs(ball) do
            if v.ballon==contact.bodyA or v.ballon==contact.bodyB then
                for j,bb in pairs(bullets) do
                    if bb==contact.bodyA or bb==contact.bodyB then
                        sound(DATA, "ZgNAXS4wQEBAQEBA/9iePiN3mD64nKs+cgBAf0BAQEBAb0BA  ")
                        collision={i,j}   -- see note 3 above
                    end
                end
            end
        end
    end      
end

Ballons = class()

function Ballons:init(x,y,r,c,lv)
    self.radius = r or math.random(25,50)
    self.ballon = physics.body(CIRCLE,self.radius)
    self.ballon.x = x or math.random(150,WIDTH - self.radius)
    self.ballon.y = y or math.random(-HEIGHT/2,-self.radius)
    self.ballon.linearVelocity = lv or vec2(0,math.random(100,200))
    self.ballon.info="ball"
    self.colr = c or color(math.random(255),math.random(255),math.random(255),math.random(100,150))
end

function Ballons:count()
    for i = 1,#ball do
        if self.ballon.y > HEIGHT + self.radius then
                table.insert(number,1)
                table.remove(ball,i,ball[i])
        end
    end
end

Can’t make a start button so I’ve added a five second delay.
How can I make a start button?
And how should I write the score as text not print in the end?

24

There was a recent post on how to create a start button, have a look for that

I would play around with writing text on the screen until you like it.

25

Thanks

26

How can I write number of values in a table on the screen as text?

27

You’d need to figure out the x,y values yourself and use the text function to write each item where you want it. There’s no shortcut.

28 

displayMode(FULLSCREEN)
supportedOrientations(PORTRAIT)

function setup()
    scores={21342,12657,32121,54324,43278,33287,55223,45121,21387,22418}
end

function draw()
    background(40, 40, 50)
    showScores()
end

function showScores()
    fill(255)
    fontSize(40)
    for z=1,#scores do
        text(scores[z],WIDTH/2,HEIGHT-80*z)
    end
end
29

Thanks for the code. Though I didn’t use it as it is but it helped me find a solution for my problem