I am drawing lines using Canvas (HTML 5), since lines/shapes are not stored as objects in Canvas, I cannot attach unique events to it (eg onmouseclick)

I wish to attach a onmouseover event to a line, is it possible by getting to know if the mouse if over a particular line (using its 2 X and 2 Y co-ordinates) in Canvas using Javascript. Would this work for different line widths (eg: 2,5 pixels)

Want to avoid using SVG as the entire project is built on Canvas

Please advise.