Making a Dotted/Dashed Line

[kexisse]

I'm trying to draw a dotted/dashed line.
I just found setLineStipple but it's removed in Löve 0.8.
Is there an alternative method?

[Anickyan]

You can create your own line drawing function. It would typically look something like this:

Code: Select all

function drawLine(x1, y1, x2, y2)
  love.graphics.setPointSize(1)

  local x, y = x2 - x1, y2 - y1
  local len = math.sqrt(x^2 + y^2)
  local stepx, stepy = x / len, y / len
  x = x1
  y = y1

  for i = 1, len do
    love.graphics.point(x, y)
    x = x + stepx
    y = y + stepy
  end
end

Now think of how you could make a strippled line. Thinking it up yourself always helps learning!

[darkfrei]

Based on diagonal marching, between two points is distance as longest coordinate difference:

Code: Select all

function getLinePoints(x1, y1, x2, y2)
  local points = {}

  local deltaX, deltaY = x2 - x1, y2 - y1
  local len = math.max (math.abs(deltaX), math.abs(deltaY))

  for iStep = 0, len do -- including first and last points
    table.insert (points, x1 + deltaX * iStep/len)
    table.insert (points, y1 + deltaY * iStep/len)
  end
  return points
end

For dash line check

Code: Select all

if iStep%4 < 2 then -- add point 

[milon]

Here's a pretty elegant method that still works!
viewtopic.php?t=83295

EDIT - Wow, just realized this is quite a necro! >_<
But it's amazing that a draw method from 7 years ago still works!

[togFox]

Also noting love.graphic.point doesn't work any more.

love.graphic.points can be used exactly the same way.