Two touches = one moving?

Mac_n_chese

When I touch one area then touch another (2 touches at once)codea recognizes it as one single touch moving, meaning that if the first or second touch is lifted, both are recognized as ended. Help?

dave1707

@Mac_n_chese Look at this code to see how multiple touches can be kept independent of each other. Touch the screen with several fingers and move them. Lift your finger and retouch to see how the touched are seperate from each other.

displayMode(FULLSCREEN)

function setup()
    tab={}  -- table for touched info, (x,y,id,color)
    col={}  -- table for 10 colors
    for z=1,10 do   -- create 10 random colors
        c=color(math.random(255),math.random(255),math.random(255))
        table.insert(col,c)
    end
end

function draw()
    background(0, 0, 0, 255)
    for a,b in pairs(tab) do    -- use touch info to draw colored circles
        fill(col[b.w])  -- set color of touched circle
        ellipse(b.x,b.y, 100, 100)  -- draw circle at touched x,y location
    end
end

function touched(t)
    if t.state==BEGAN then  -- touch started
        for a,b in pairs(tab) do    -- check if touched id is already in table
            if t.id==b.z then   -- id in table, exit touched function
                return
            end
        end
        -- touch id isn't in the table
        -- save x,y values, touch id, and a color from 1,10
        table.insert(tab,vec4(t.x,t.y,t.id,math.random(10)))
    end            
    if t.state==MOVING then -- check which touch id is moving
        for a,b in pairs(tab) do
            if t.id==b.z then   -- id matches table
                b.x=t.x -- update x,y values with new location
                b.y=t.y
            end
        end
    end
    if t.state==ENDED then  -- check which touch id has ended
        for a,b in pairs(tab) do
            if t.id==b.z then   -- touch id matches table
                table.remove(tab,a) -- remove it from the table
            end
        end
    end
end

Mac_n_chese

You never cease to amaze me with your quick and helpful replies @dave1707
I'll look into it

dave1707

@Mac_n_chese I don't have any comments on the code, so if you have any questions, I can add some.

Mac_n_chese

I'm understanding most of it, but if I have any questions I'll ask. Thanks

Mac_n_chese

Heh, I'm kinda embarrassed, but could you please add comments? XD

dave1707

@Mac_n_chese I added comments to the above code. If you still have questions, just ask.

Mac_n_chese

I do have one question..... In the multitouch example ( which I found after posting this discussion) uses something like: tab[t.id]=t. What is it in this example that does the same thing?

dave1707

@Mac_n_chese tab[t.id]=t is just creating a table using the id as the key to a table. What I'm doing is saving the x,y,id,color values as a vec4 in a table. So the uses of the tables are different.

Mac_n_chese

Ah I see, thanks again