Problem with painting

Examples
1

Hi,
I want to make a painting programm.
I want to Draw a ellipse where the user touch (I know that it works with CurrentTouch.x and CurrentTouch.y)
The Problem is because of the draw Funktion Starts again and again the Circle goes away.
I want the Circle still there so that you can draw something.

2

Get rid of the background function in draw()

3

Here’s a simple painting program. You can change the color and line size. Just drag your finger around the screen.

function setup()
    backingMode(RETAINED)
    parameter.color("col",255)
    parameter.integer("size",2,40,2)    
end

function draw()
    if dr then
        stroke(col)
        strokeWidth(size)
        line(bx,by,tx,ty)
        bx,by=tx,ty
    end
end

function touched(t)
    if t.state==BEGAN then
        bx,by=t.x,t.y
    end 
    if t.state==MOVING then
        dr=true
        tx,ty=t.x,t.y
    end
    if t.state==ENDED then
        dr=false
    end
end
4

@lidddl You can find a lot of information/examples by doing a forum search. The search area is at the top right above the New Discussion box.

5 
displayMode(FULLSCREEN)

function setup()
    pos={}  -- x,y position
end

function draw()
    background(0)
    fill(255,0,0)
    for a,b in pairs(pos) do
        ellipse(b.x,b.y,40,20)  
    end 
end

function touched(t)
    if t.state==BEGAN then
        table.insert(pos,vec2(t.x,t.y))
    end
end
6

Thank you for your answers.I will try it