elseif lines.current.pending.mode == 'circle' then
        local mx,my = coord(x-16), coord(y-lines.current.y)
        if mx >= 0 and mx < 256 and my >= 0 and my < lines.current.h then
          local center = lines.current.points[lines.current.pending.center]
          lines.current.pending.radius = math.dist(center.x,center.y, mx,my)
          table.insert(lines.current.shapes, lines.current.pending)
        end

        elseif current_mode == 'circle' then
          local j = insert_point(drawing.points, coord(x-16), coord(y-drawing.y))
          drawing.pending = {mode=current_mode, center=j}

  elseif shape.mode == 'circle' then
    local center = drawing.points[shape.center]
    love.graphics.circle('line', pixels(center.x)+left,pixels(center.y)+top, pixels(shape.radius))

  elseif shape.mode == 'circle' then
    local center = drawing.points[shape.center]
    local mx,my = coord(love.mouse.getX()-16), coord(love.mouse.getY()-drawing.y)
    if mx < 0 or mx >= 256 or my < 0 or my >= drawing.h then
      return
    end
    local cx,cy = pixels(center.x)+left, pixels(center.y)+top
    love.graphics.circle('line', cx,cy, math.dist(cx,cy, love.mouse.getX(),love.mouse.getY()))

  elseif shape.mode == 'circle' then
    local center = drawing.points[shape.center]
    return math.dist(center.x,center.y, x,y) == shape.radius

  elseif chord == 'C-c' then
    current_mode = 'circle'

function math.dist(x1,y1, x2,y2) return ((x2-x1)^2+(y2-y1)^2)^0.5 end