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What would be the preferred way to convert opacity (0 - 1) to hex (00 - ff) in Javascript?
My thoughts are to use an if statement to check if opacity is between 1 and 0.95 then use ff. Work my way down to 0.
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An alpha value of 0 (or 00 in hex strings) corresponds to fully transparent and an alpha value of 1 (or FF in hex strings) corresponds to fully opaque. If a color hex string in R does not provide an explicit alpha transparency, the color is assumed to be fully opaque.
Converting RGBA to hex with the #rgba or #rrggbbaa notation follows virtually the same process as the opaque counterpart. Since the alpha ( a ) is normally a value between 0 and 1, we need to multiply it by 255, round the result, then convert it to hexadecimal.
At the most basic level, you're just converting a decimal to hex: How to convert decimal to hex in JavaScript?:
yourNum = yourNum.toString(16);
The 0.0 - 1.0 range is just a percentage format of the 0-255 range. So multiply your value (e.g. 0.5 * 255) then convert to hex, you'll get the correct value.
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