class
	EV_DRAWABLE_CONSTANTS

General
	cluster: interface
	description: 
		"Constants for use by and with EV_DRAWABLE.
		
		Note: With every drawing mode constant, a truth table is given.
		S means the source. This is the color of the pixel that is about
		to be applied. T means target. This is the color of the pixel that
		is currently on the place where the new pixel is about to be set."
	keywords: "figures, primitives, drawing, line, point, ellipse"

Ancestors
	ANY

Queries
	Drawing_mode_and: INTEGER_32
	Drawing_mode_copy: INTEGER_32
	Drawing_mode_invert: INTEGER_32
	Drawing_mode_or: INTEGER_32
	Drawing_mode_xor: INTEGER_32
	valid_drawing_mode (a_mode: INTEGER_32): BOOLEAN