Joining lines with circles?

[ffive]

How can one implement this?

[ivan]

This is typically called a rounded join.
Doesn't seem to be supported according to the love2d documentation.

[zorg]

You could fake it by drawing filled circles at the end-points of line segments yourself, with love.graphics.circle.
(And make sure to optimize it so only one gets drawn between two segments, not two because of the end-points.)

[grump]

You could fake it by drawing filled circles at the end-points of line segments yourself, with love.graphics.circle.

Beware: lines (may?) have antialiasing applied to them, filled circles do not. The result might look unsatisfactory.


You achieve better results if you draw both filled and line circles:

Code: Select all

function love.draw()
	local w = 40
	love.graphics.setColor(255, 255, 255)
	love.graphics.setLineWidth(w)
	love.graphics.setLineJoin('none')
	love.graphics.line(100, 200, 240, 100, 300, 200, 320, 100)
	love.graphics.setLineWidth(2)
	love.graphics.circle('line', 240, 100, w * .5 - 1)
	love.graphics.circle('line', 300, 200, w * .5 - 1)
	love.graphics.circle('fill', 240, 100, w * .5 - 1)
	love.graphics.circle('fill', 300, 200, w * .5 - 1)
end

Tweaking the circle sizes might yield even better results.

[ffive]

Thanks for responding!
Well, i've actually tried this solution and it worked for drawing lines.
The problem is in the way how love handles line rendering internally.
Say, if you draw an outline of a slim ellipse (1:10, for example) you may notice how outline kinda 'breaks' on the ends of an ellipse
(To clarify: calling " love.graphics.ellipse( "line" , x,y , 50 , 5 ) " will draw an ellipse strerched along x-axis. So, the outline will break on the left and right side of the shape.)
The effect gets more visible if strokes are wide.
So, clarifying the question, is there a way to add some new kind of linejoin to love?
--
This isn't crucial actually, I know that might appear way too hard to implement. Just curious.

[zorg]

Well, i've actually tried this solution and it worked for drawing lines.
The problem is in the way how love handles line rendering internally.
Say, if you draw an outline of a slim ellipse (1:10, for example) you may notice how outline kinda 'breaks' on the ends of an ellipse

But here's what i don't understand... both with a single line or multiple line segments joined, you still never would have to draw an ellipse, only circles.

[pgimeno]

There's this library: viewtopic.php?f=5&t=83841 which reimplements Löve's line drawing algorithm. That one you can modify to add a new kind of linejoin.