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将浮点数转换为RGB或HEX

[英]convert floating point number to RGB or HEX

原文 2013-11-01 02:18:41 2 1 javascript/ floating-point/ hex/ rgb

I have the following floating point number 8.8489784e-39 extracted from the PCD DATA FORMAT which represents the RGB value of one point of the point cloud. 我从PCD数据格式中提取了以下浮点数8.8489784e-39 ，它表示点云的一个点的RGB值。

I have to convert this to either HEX directly or to Int->RGB or whichever way. 我必须将其直接转换为HEX或Int-> RGB或以任何方式转换。 I searched the web but couldn't put anything together so far as my experience with floating-point arithmetic in javascript is fairly limited. 我搜寻了网路，但无法进行任何整合，因为我在javascript中使用浮点运算的经验相当有限。

1 个解决方案

So I'm guessing that's one byte each of red, green, and blue, stored in the first three bytes of a 4-byte word, which is then inexplicably interpreted as a float instead of an int. 所以我猜这是一个红色，绿色和蓝色的字节，分别存储在一个4字节字的前三个字节中，然后莫名其妙地将其解释为浮点数而不是整数。

If that's the case, then 8.8489784e-39f represents the RGB triple (90,91,96) [decimal] or #5a5b60 in web hex. 如果是这种情况，则8.8489784e-39f代表Web十六进制中的RGB三重（90,91,96）[decimal]或#5a5b60 。

But doing that conversion in Javascript will not be easy. 但是用Javascript进行转换并不容易。 You could look at the conversion function decodeFloat defined here , or perhaps you can start with the answer to this question . 您可以查看此处定义的转换函数decodeFloat ，或者可以从此问题的答案开始。