/** @noSelfInFile */

/**
 * These functions require that a screen or other viewport is created and active.
 */
declare namespace gfx {
    /**
     * Fill the entire active viewport with the current background color.
     */
    export function cls(): void;

    /**
     * Get/set the current foreground color of the active viewport.
     */
    export function fgcolor(color?: number): number;

    /**
     * Get/set the current background color of the active viewport.
     */
    export function bgcolor(color?: number): number;

    /**
     * Draw a line with the current foreground color.
     */
    export function line(x1: number, y1: number, x2: number, y2: number): void;
}