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You mean to draw a line on a canvas?  http://www.w3schools.com/tags/canvas_lineto.asp


Keep in mind that 2d drawing is like plotting a path, the pixel where one line ends is where the next line will begin with a lineTo(x, y), unless you move to a new position with moveTo(x, y).


Also, keep in mind that in the link provided, they don't use ctx.closePath(), which is needed if you are using 2d drawing in a loop.  Not closing the path will just keep your 2d drawing commands stacking paths and eventually you'll notice some performance issues.

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