Using mirrored quads in a spritebatch?

[rougan]

Hi there,
I'm looking for a way to add a combination of normal and mirrored instances of a
quad to a spritebatch. (I'm adding objects to an isometric map)

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Quad:flip

looked like it would've done the job if it wasn't removed

I appreciate you can draw mirrored quads using lg.draw() but I don't think that'd be much to use to me when drawing the whole spritebatch.

I found this old answers by bartbes, but I don't really understand how I would use viewports to acheive the mirroring.. so if anybody could provide any enlightenment that'd be great!
Thanks!

[pgimeno]

What bartbes said means this:

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  local x, y, w, h = quad:getViewport()
  quad:setViewport(x, y, -w, h) -- horizontal mirror; put the sign in h for vertical mirror

What I'm not sure is whether you need to do this instead. I imagine the above is correct, but if it shows the wrong tile, try this:

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  local x, y, w, h = quad:getViewport()
  quad:setViewport(x+w, y, -w, h)

[slime]

You can apply the mirroring by using a negative scale parameter in SpriteBatch:add (rather than love.graphics.draw).

[drunken_munki]

Both the above are correct, it works for me. I do something like this:

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      if object.mirror == true then
        ATLAS_SPRITEBATCH:add(object.source, object.drawx + object.w, object.drawy, object.r, -object.s, object.s)
      else
        ATLAS_SPRITEBATCH:add(object.source, object.drawx, object.drawy, object.r, object.s, object.s)
      end

The negative on the scale x will mirror, but you must add the width to offset it back into position.

[rougan]

Thanks so much for the replies. I managed to get it working using slime's method... I can't believe I missed that!