How can CSS positioning be utilized to align lines accurately?

Recently, I created a basic jsbin to draw a line connecting two points. It doesn't rely on any drawing libraries; just plain JavaScript and jQuery.

I managed to calculate the angle using code I found in this library.

When dragging the circle at the bottom right (which I made draggable with jQuery), everything looks fine thanks to this snippet:

$("#line") .width(...)
           .css('-webkit-transform', 'rotate(' + angle  + 'deg)')
           .css('-webkit-transform-origin','top left').

The red line's rotation axis is set to the top left point, ensuring its proper display.

But things get complicated when I start moving the circle at the top left... I'm unsure how to handle the position of the red line then...

  • How can I adjust the code in -webkit-transform-origin to accommodate both changes seamlessly?
javascriptjqueryhtmlcss

Answer №1

Don't forget to include the left offset for the line:

Insert

.css('left',x2+10)

(and update 

.css('top',$('#box2').offset().top+10)
with .css('left',y2+10))

Once you make these changes, everything will function correctly:

Check out your modified example - now starting off right;)

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