HTML5 Canvas Cookbook

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HTML5 canvas lines can also have one of three varying line caps, including butt, round, and square. The line cap style can be set using the lineCap property of the canvas context. Unless otherwise specified, the line cap style is defaulted to butt. The following diagram shows three lines, each with varying line cap styles. The top line is using the default butt line cap, the middle line is using the round line cap, and the bottom line is using a square line cap:

Notice that the middle and bottom lines are slightly longer than the top line, even though all of the line widths are equal. This is because the round line cap and the square ...