hexadecimal to retrive a colour

[Yambanshee]

I know that somehow using bitmap data or something that i can get the colour from a bitmap object. Thing is though i have never worked with these type of things. So i ask newgrounds two questions:

how do i get the colour of a object (colour squares) and store it as a variable to be called latter in the hexadecimal parameter for the drawing api

[Johnny]

At 6/19/09 11:39 AM, Yambanshee wrote: how do i get the colour of a object (colour squares) and store it as a variable to be called latter in the hexadecimal parameter for the drawing api

You can use getPixel(x, y) or getPixel32(x,y) if you're using alpha to retrieve the color. Then just store it in a variable cast as uint

var color:uint = getPixel(20, 50);

[northxiv]

Also, one minor note is that if your image is being imported in to the library, the hex values will not be the same in Flash as they might be in Photoshop. Even when importing an image in, Flash will compress it somewhat, which will distort the actual color values. I figured this out when I was trying to generate an image with specific pixel values in Photoshop, yet when I traced the values in Flash, they were different.

[Yambanshee]

thanx, but for some reason the code i use doesint work. i used:
trace(thing.getPixel(_root._xmouse, _root._ymouse));
but it always returns as undefined

thing is a screenshot that i turned into a movieclip and even selected the convert to bitmap at runtime option.

im using AS2 btw

[liaaaam]

Is the trace happening as soon as the flash is loaded? Put it inside onMouseDown and then click the image and it should work.

[Johnny]

Didn't realize you're using AS2.0. I don't think uint was supported. You can use :Number instead.

Like Liam said, also make sure the image is fully loaded before trying it.

[Yambanshee]

its on a onEnterFrame loop

[liaaaam]

At 6/19/09 12:05 PM, Yambanshee wrote: its on a onEnterFrame loop

Strange, post your code :p

[Yambanshee]

full code. I was playing around with this to learn it so i got nothing else on this fla but a bitmap movieclip

var myvar:Number = 0
function onEnterFrame() {
	myvar = thing.getPixel(_root._xmouse, _root._ymouse)
	trace(myvar);
}

[UnknownFury]

I'm fairly sure you can't do it like that. Try something along the lines of:

import flash.display.BitmapData;
import flash.geom.Matrix;

var bmp:BitmapData = new BitmapData(550, 400);

var m:Matrix = new Matrix();
m.tx = theMC._x;
m.ty = theMC._x;
bmp.draw(theMC, m);

trace(bmp.getPixel(50, 50));

[Johnny]

You might have to place that movieclip inside a bitmapData object in order to use the setPixel function properly.

Then reference the bitmapData object directly:

bitmapData.getPixel(x,y);

[liaaaam]

Aha, so the problem was you were trying to get the pixel of a bitmap object.. haha. Yeah, it has to be a bitmapdata object not an actual bitmap, so you need to draw the bitmap to the bitmapdata.

[Yambanshee]

well it works, but i've got my next problem.
current code:

btn.onPress = function() {
	import flash.display.BitmapData;
	import flash.geom.Matrix;
	var bmp:BitmapData = new BitmapData(600, 400);
	var m:Matrix = new Matrix();
	m.tx = btn._x;
	m.ty = btn._y;
	bmp.draw(btn, m);
	rgb = bmp.getPixel(_root._xmouse, _root._ymouse);
	rgb = "0x"+rgb;
	var obj = new Color("obj");
	obj.setRGB(rgb);
};

and the swf

[knugen]

At 6/19/09 12:56 PM, Yambanshee wrote: rgb = "0x"+rgb;

Try removing this line, it's not the correct way to convert a decimal number to hexadecimal, and you don't need to pass the setRGB function a hexadecimal value.

[Yambanshee]

At 6/19/09 01:10 PM, knugen wrote:

At 6/19/09 12:56 PM, Yambanshee wrote: rgb = "0x"+rgb;

Try removing this line, it's not the correct way to convert a decimal number to hexadecimal, and you don't need to pass the setRGB function a hexadecimal value.

That sure did fix it :D

Thanx a lot to all of you! sorry for seeming to ask such noobie questions, but through my past experiance i have never worked with this!
I think that's all I'm gonna need, thanx guys!

[knugen]

By the way, if you would still like to do the converting (to show on screen or something), do this:

var rgbString:String = "#" + rgb.toString(16);

[Yambanshee]

At 6/19/09 01:30 PM, knugen wrote: By the way, if you would still like to do the converting (to show on screen or something), do this:

var rgbString:String = "#" + rgb.toString(16);

thanx, ill keep it in mind what i made with all your help!

[liaaaam]

Just for the record, Flash has a colour picker component .. lol :P

[Yambanshee]

At 6/19/09 02:06 PM, liaaaam wrote: Just for the record, Flash has a colour picker component .. lol :P

:O oh well. Dont know how to use them anyways + now i learned a new thing :D