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Color Codes Question?

Started by clabinsky Dec 20, 2002 at 2:07 AM 3 replies 350+ views

Original Post

Dec 20, 2002 at 2:07 AM

Ok, this is probably very simple but I have tried finding info and downloaded som program that should help, but I still cannot get it right. The problem is that I need to create background colors but I do not get the hex codes, using C++ and direct X. For example, I have a function: void paintCircle(int radii, unsigned int color) { //do the painting } To call this function and get a red circle what should the argument of color be? What should the data type be? Is there an easy way to calculate this? If anyone knows a good article about it, I''d appreciate a URL. Thanks!

ZoomBoy

Dec 20, 2002 at 2:34 AM

1st assumption is that your unsigned int colour refers to 32 bit colour and that usually works out to a 4 Byte quantity = in the format RGBA or other types
R = red Range of 0 to 255
G = Green Range of 0 to 255
B = Blue Range of 0 to 255
A = Alpha Range of 0 to 255

Black would = 0, 0, 0, 0
White would = 255, 255, 255, (0 or whatever)

A reasonable Green R0, G215, B0, A0

Now to combine the components, you are going to have to shift them
And IF the format is RGBA
colour = (Red << 24) + (Green << 16) + (Blue << 8) + Alpha

But if you can get a pixel off of a screen, you can just store the value and display it onscreen

ZoomBoy
Developing a iso-tile 2D RPG with skills, weapons, and adventure. See my old Hex-Tile RPG GAME, character editor, diary, 3D Art resources at Check out my web-site

clabinsky

Dec 20, 2002 at 2:38 AM

Thanks a lot!

It is partly what I wanted. I have done it that way and from your answer I realize that either I am doing somthing else wrong or I might not have been thorough enough in my question.

With DX, I am using the DDBLTFX structure and I am actually using the function argument to set the .dwFillColor of the struct.

Is that correct, because I never seem to get the colors I want...

Sorry for not being more precise from the start.

Regards

//EDIT: I seem to miss information here: I am working in 16 bit colors with DX

[edited by - clabinsky on December 20, 2002 3:41:16 AM]

ZoomBoy

Dec 20, 2002 at 5:22 AM

Hehe I work in 16bit

You have the usual 565 deciphering to do
0-63, 0-128, 0-63 are the ranges

colour = (Red << 11) + (Green << 6??) + (Blue)

I use digit numbers for my colours
Red 63648
Blue 543
Green 24543
Blackish 2407
Total White 65535
Total Black 0

ZoomBoy
Developing a iso-tile 2D RPG with skills, weapons, and adventure. See my old Hex-Tile RPG GAME, character editor, diary, 3D Art resources at Check out my web-site

[edited by - ZoomBoy on December 20, 2002 6:24:51 AM]

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