Scratch color parameter saving format?

GP1

Hello. I opened up the JSON of a project with the

<touching color [#000000]?>

block. The block's object looked like this:

["touchingColor:", -13687519]

The value that Scratch saves to the JSON is -13687519 for the color. Looking around, it looks like this is a 8-bit color format? Perhaps RRRGGGBB? If so, why is there a negative, unless it is unsigned (or signed, what ever it is, I can't remember).

blob8108

Hexadecimal 0xAARRGGBB, apparently.

Have a look at this project,: I believe it's the same idea.

tosh · slowly becoming a grown-up adult and very confused about it

scimonster

blob8108 wrote:
Hexadecimal 0xAARRGGBB, apparently.

Have a look at this project,: I believe it's the same idea.

I agree with the statement, but where does it say that on the wiki article? ~~~~

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blob8108

scimonster wrote:
where does it say that on the wiki article?

In a couple of places, describing color-related fields. For example, the `textColor` field on Scratch_2.0_File_Format#Costume_objects.

~~~~

tosh · slowly becoming a grown-up adult and very confused about it

MathWizz

To add to blob, it is also signed.

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davidkt

What's the A?

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GP1

davidkt wrote:
What's the A?

Alpha. It is the transparency of the image.

GP1

Ok, cool. I made some JavaScript on a JSFiddle to see if I could do it from the value to ARGB. Here is the code I got. I don't know whether I am supposed to keep the value in the project signed or not.

var colorNumber = -13687519;

var a = colorNumber >> 24 & 0xFF;
var r = colorNumber >> 16 & 0xFF;
var g = colorNumber >> 8 & 0xFF;
var b = colorNumber & 0xFF;

window.alert("a: " + a + "\nr: " + r + "\ng: " + g + "\nb: " + b);

Last edited by GP1 (April 16, 2014 22:57:30)

blob8108

MathWizz wrote:
To add to blob, it is also signed.

tosh · slowly becoming a grown-up adult and very confused about it

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