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Home Page: https://grhp.github.io/pixels/
pixel-perfect canvas test
Home Page: https://grhp.github.io/pixels/
This test draws a small set of single-pixel thick lines onto a 2D canvas. It draws vertical lines into the left-most pixel column, the 101st column, and the right-most column. The right-most column is what's tricky! It also does the same thing for the vertical axis. Because the test uses integer coordinates, it uses "translate" to apply an offset by a half-pixel, otherwise the lines appear thicker than intended. It is interesting to note that the following formula for determining physical width results in a non-integer value on some mobile devices: canvas.clientWidth * window.devicePixelRatio This results in subtle blurring around the lines, and right-most / bottom-most lines go missing.
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