import { OnDestroy, Renderer2, AfterViewInit, ElementRef, Injector } from '@angular/core';
import { CanvasDrawMode } from './enums/canvas-draw-mode.enum';
import { ICanvas } from './interfaces/canvas.interface';
import { Point } from './classes/point';
import * as i0 from "@angular/core";
/**
 * The base directive that is used to extend canvas components.
 */
export declare abstract class CanvasBaseDirective implements OnDestroy, AfterViewInit {
    protected injector: Injector;
    /**
     * If a different element should handle the inputs, put it into eventElement.
     */
    eventElement: HTMLElement | null;
    protected elementRef: ElementRef;
    protected renderer: Renderer2;
    protected height: number;
    protected width: number;
    protected drawMode: CanvasDrawMode;
    protected clearOnDraw: boolean;
    private dragAndDropEnabled;
    private dragging;
    private dragStartPosition;
    private dragMaxDistance;
    private dragStartTimeout;
    private dragStartTimeoutHandle;
    private inDrawingLoop;
    private currentFrameRequestID;
    private lastTime;
    private disposed;
    private canvas;
    constructor(injector: Injector);
    ngAfterViewInit(): void;
    ngOnDestroy(): void;
    private attachCanvas;
    toBase64(): string;
    toBlob(type?: string, quality?: number): Promise<Blob | null>;
    getCanvas(): ICanvas;
    resize(width: number, height: number): void;
    protected getCanvasNode(): HTMLElement;
    protected startDrawing(): void;
    protected createOffscreenBuffer(width: number, height: number): ICanvas;
    draw(): void;
    setDrawMode(drawMode: CanvasDrawMode): void;
    isDragAndDropEnabled(): boolean;
    enableDragAndDrop(enable: boolean): void;
    protected abstract onDraw(canvas: ICanvas, deltaTime?: number): void;
    protected eventResize(width: number, height: number): void;
    protected eventDrag(event: PointerEvent): boolean;
    protected eventDragMove(event: PointerEvent): void;
    protected eventDrop(event: PointerEvent, startPosition: Point): void;
    protected eventClick(event: PointerEvent): void;
    protected eventPointerMove(event: PointerEvent): void;
    protected eventPointerUp(event: PointerEvent): void;
    protected eventPointerDown(event: PointerEvent): void;
    protected eventPointerLeave(event: PointerEvent): void;
    protected getTime(): number;
    protected getTimeDelta(): number;
    protected getDistance(x1: number, y1: number, x2: number, y2: number): number;
    private requestDraw;
    private mouseUp;
    private mouseMove;
    private mouseDown;
    private mouseLeave;
    static ɵfac: i0.ɵɵFactoryDeclaration<CanvasBaseDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<CanvasBaseDirective, never, never, { "eventElement": "eventElement"; }, {}, never>;
}