(IX) Colors: depth, color & rgb

Helo everybody!

In this entry we will see how to work with colors. We will use the already known screenres instruction to define a depth color of 4 bits per pixel (4 bpp) to have 2^4=16 colors labeled from 0 to 15. Color 0 is black and also works as transparent in 4bpp.

Take a look at this code:

Let me explain the new keyword used:

color to change foreground and background colors. Must be followed with a cls to submit the changes.

When we execute this code we can see foreground and background colors changing with every step of the loop through all its possible values. This is one of this:

If we want to define 24 bpp depth we can use the instruction rgb to generate the color value.

rgb means red, green & blue components and we can use numbers from 0 to 255 to indicate the amount of each color this way:

rgb(0,0,0) for black
rgb (255,255,255) for white
rgb(255,0,0) for all red
rgb(0,255,0) for all green
rgb(0,0,255) for all blue
rgb(255,0,255) for magenta used as transparent in 24bpp
if the amount of r, g and b are the same it means a grey
and all the colors in between

Feel free to prove some values modifying the next code:

This is enough by now, in the next entry we will talk about writing in the screen.

Contact me for any question and tell me your feedback, see you!

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Learning FreeBASIC through videogames

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