import { BoundsUnmodifiable } from './bounds';
import { Axis2D } from './plot/axis';
export declare function glOrtho(left: number, right: number, bottom: number, top: number, near: number, far: number): Float32Array;
export declare function glOrthoViewport(viewport: BoundsUnmodifiable): Float32Array;
export declare function glOrthoAxis(axis: Axis2D): Float32Array;