shoot1

gistfile1.txt

-- Main

function setup()
    numtouches=0 --number of current touches
    aim={id=0,x=0,y=0} --details for touch which is aiming
    createScope() 
    shots={} --table for shots fired
    shotSize=7 --size of shot mark
    shotColour=color(255)
    print("Hold and move one finger on the screen to aim")
    print("Tap with a second finger to shoot")
end

function createScope()
    scopeBuffer=70 --draw scope this many pixels above finger (so user can see scope!)
    scopeOuterRing=50 --pixels
    scopeInnerRing=20
    crossHairExtends=10 --crosshairs extend this far outside rings
    local s=scopeOuterRing+crossHairExtends*2 --total width
    --since we're drawing the same scope a lot, we create an image
    imgScope=image(s,s)
    setContext(imgScope) --start drawing on the image instead of the screen
        ellipseMode(CENTER) 
        strokeWidth(.5)  --lines one pixel wide
        stroke(94, 89, 89, 255) --dark colour
        fill(0,0,0,0) --transparent fill (the last item, alpha, is nil)
        ellipse(s/2,s/2,scopeOuterRing)  --draw rings
        ellipse(s/2,s/2,scopeInnerRing)
        line(s/2,0,s/2,s) --draw crosshairs
        line(0,s/2,s,s/2)
    setContext() --stop drawing on image
end

function touched(touch)
    if touch.state==BEGAN then --user has just touched, hasn't let go yet
        numtouches=numtouches+1 --keep count
        if numtouches==1 then  --if first touch, it is aiming, store details
            aim.id=touch.id --so we know which touch is which when we shoot
            aim.x=touch.x
            aim.y=touch.y
        end
    elseif touch.state==MOVING then --finger is moving
        if touch.id==aim.id then --if the aiming finger, store new x,y
            aim.x=touch.x
            aim.y=touch.y
        end
    elseif touch.state==ENDED then 
        if touch.id==aim.id then aim.id=0 --if aiming finger lifted, remove scope
        elseif numtouches>1 then --if more than one finger, bang bang!
            shots[#shots+1]={x=aim.x,y=aim.y+scopeBuffer} --add shot to table
        end
        numtouches=numtouches-1 --adjust touch count  
    end
end

function draw()
    background(195, 211, 215, 255)
    popStyle()
        --draw target
        stroke(82, 181, 199, 255) --outer circle colour
        strokeWidth(25)
        fill(120, 141, 186, 255)  --inner circle colour
        ellipse(WIDTH/2,HEIGHT/2,100)
        if aim.id>0 then --if aiming, draw scope
            sprite(imgScope,aim.x,aim.y+scopeBuffer)
        end
        --draw past shots on screen
        for i,v in pairs(shots) do
            fill(shotColour)
            strokeWidth(0)
            ellipse(v.x,v.y,shotSize)
        end
    pushStyle()
end