It depends on the background to which your transparent color will be applied. But if you know the color of the background (e.g. white), you can calculate the RGB color resulting of the RGBA color applied to the specific background. It’s just the weighted average between the color and the background, the weight being the … Read more
The hex codec has been chucked in 3.x. Use binascii instead: >>> binascii.hexlify(b’hello’) b’68656c6c6f’
From the discussion here, and especially this answer, this is the function I currently use: private static final char[] HEX_ARRAY = “0123456789ABCDEF”.toCharArray(); public static String bytesToHex(byte[] bytes) { char[] hexChars = new char[bytes.length * 2]; for (int j = 0; j < bytes.length; j++) { int v = bytes[j] & 0xFF; hexChars[j * 2] = … Read more
As I am on Kotlin 1.3 you may also be interested in the UByte soon (note that it’s an experimental feature. See also Kotlin 1.3M1 and 1.3M2 announcement) E.g.: @ExperimentalUnsignedTypes // just to make it clear that the experimental unsigned types are used fun ByteArray.toHexString() = asUByteArray().joinToString(“”) { it.toString(16).padStart(2, ‘0’) } The formatting option is … Read more
If you’re not bothered about too much control, and just want a generally darker version of a colour, then: col = (col & 0xfefefe) >> 1; Is a nice quick way to halve a colour value (assuming it’s packed as a byte per channel, obviously). In the same way brighter would be: col = (col … Read more
Just use a for loop to go through each couple of characters in the string, convert them to a character and then whack the character on the end of a string builder: String hex = “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”; StringBuilder output = new StringBuilder(); for (int i = 0; i < hex.length(); i+=2) { String str = hex.substring(i, … Read more
By default, jQuery serializes the data (passed in data property) – and it means 0xFD008001 number gets passed to the server as ‘4244668417’ string (10 bytes, not 4), that’s why the server treats it not as expected. It’s necessary to prevent such behaviour by setting $.ajax property processData to false: By default, data passed in … Read more
Python’s integers can grow arbitrarily large. In order to compute the raw two’s-complement the way you want it, you would need to specify the desired bit width. Your example shows -199703103 in 64-bit two’s complement, but it just as well could have been 32-bit or 128-bit, resulting in a different number of 0xf‘s at the … Read more
The accepted answer does not consider leading zeros which may cause problems This question answers it. Depending on whether you want to see how its done or just use a java built-in method. Here are the solutions copied from this and this answers respectively from the SO question mentioned. Option 1: Util method public static … Read more