how to access a display.line's nth vertex?

Games
#1

I’d like to draw distance joints (without setting the physics drawMode to “debug” or “hybrid”).

What I am doing right now is maintaining a joints-and-hints table:

physics.pause()  
  
local joints = {}  
  
function join(b1, b2)  
 local j = physics.newJoint( "distance", b1, b2, b1.x, b1.y, b2.x, b2.y)  
 local l = display.newLine(b1.x,b1.y, b2.x, b2.y)  
 l.width = 8  
 l:setColor(255,255,255)  
 joints[#joints+1] = {joint=j, hint=l, body1=b1, body2=b2}  
end

Now, I’d like to update the hints for these joints while physics is playing. So, figuring I can tap into enterFrame events, I set up a listener just for that purpose:

...  
  
Runtime:addEventListener("enterFrame", updateJointHints)  
  
function updateJointHints()  
 for i=1,#joints do  
 joints[i].hint.x = joints[i].body1.x  
 joints[i].hint.y = joints[i].body1.y  
 -- HOW DO I DO THIS? access hint's 2nd vertex so that I can update its position?  
 end  
end

Question: how do I access a display line’s nth vertex?

Thanks
Alex
[import]uid: 3473 topic_id: 2328 reply_id: 302328[/import]