Using Colors [Revelation On-Line Wiki]

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====== Using Colors ======

The [[addtable_set_printer_message|ADDTABLE]], [[fillstyle_set_printer_message|FILLSTYLE]], [[font_set_printer_message|FONT]], [[fontheadfoot_set_printer_message|FONTHEADFOOT]], and [[linestyle_set_printer_message|LINESTYLE]] messages have a color parameter. This color parameter must contain a valid COLORREF value, which is passed to the printer engine. The formula for calculating a COLORREF is:

<code>
color = 0
color += red
color += green * 256
color += blue * 65536
</code>

Where red is the red value from 0 to 255, green is the green value from 0 to 255, and blue is the blue value from 0 to 255. Black is equal to 0 and white is equal to 16843008.
                                                                                                                                                                                                                                                    
The setup program for the OIPI installed a function called [[rgb|RGB()]] that can be called from a Basic+ program to perform the conversion to the COLORREF format. There are three parameters for the [[rgb|RGB()]] function: red, green, and blue. These parameters must have values between 0 and 255. The value for each color specifies how much of each color component is contained in the COLORREF. 
Another method of obtaining a valid COLORREF is to use the Basic+ [[utility|UTILITY()]] function. The common dialog box for Colors can be displayed with the first parameter of UTILITY set to [[choosecolor_service|CHOOSECOLOR.]]
                                                                                                                                                                               
The [[oiprint_equates|OIPRINT_EQUATES]] $INSERT record contains constants for common color codes.                                                                                                                                                                                                                                                                                                                                 

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