Pixilated circle

[darkfrei]

How to make it without canvas?

Code: Select all

function love.draw()
	love.graphics.scale(20) -- really huge scale
	love.graphics.setDefaultFilter( 'nearest', 'nearest' )
	love.graphics.setLineStyle( "rough" )
	
	love.graphics.circle('line', width/2, height/2, height/2)
end

Expected: pixelated circle as above, got: almost smooth line.

[RNavega]

@darkfrei The canvas in that case is the one used by the window. If you don't / can't afford to use a Canvas object, then you need to manually plot the "pixels" of the circle using huge square rectangles, with the coordinates themselves scaled so that each circle pixel involves huge steps of screen pixels.

There's some sample code in here, but without this special scaled treatment I said above:
https://rosettacode.org/wiki/Bitmap/Mid ... orithm#Lua

[Yozzaxia]

If you're using the midpoint circle func mentioned above, I suggest using love.graphics.points:

Code: Select all

function drawPixelCircle(x, y, radius, pixelsize)
  local points = {}
  local dx, dy, err = math.floor(radius / pixelsize), 0, 1-math.floor(radius / pixelsize)
  
  while dx >= dy do
    local pdx, pdy = dx * pixelsize, dy * pixelsize
    points[#points + 1] = pdx
    points[#points + 1] = pdy
    points[#points + 1] = -pdx
    points[#points + 1] = pdy
    points[#points + 1] = pdx
    points[#points + 1] = -pdy
    points[#points + 1] = -pdx
    points[#points + 1] = -pdy
    points[#points + 1] = pdy
    points[#points + 1] = pdx
    points[#points + 1] = -pdy
    points[#points + 1] = pdx
    points[#points + 1] = pdy
    points[#points + 1] = -pdx
    points[#points + 1] = -pdy
    points[#points + 1] = -pdx
    
    dy = dy + 1
    if err < 0 then
      err = err + 2 * dy + 1
    else
      dx, err = dx-1, err + 2 * (dy - dx) + 1
    end
  end
  
  love.graphics.setPointSize(pixelsize)
  love.graphics.push()
  love.graphics.translate(x, y)
  love.graphics.points(points)
  love.graphics.pop()
end

[RNavega]

@Yozzaxia I hadn't thought of drawing using thick points. Nice code!