export type IFontWeight = 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900;
export declare class CanvasUtil {
    static createCanvas(opt?: {
        width: number;
        height: number;
    }): HTMLCanvasElement | undefined;
    static getImageUrlFromCanvas(canvas: HTMLCanvasElement): Promise<string>;
    static getTextLength(canvas: HTMLCanvasElement, text: string, fontSize: number): number;
    static scaleUnit: (pixel: number) => number;
    /**
     * 绘制圆图像
     *  @param context
     * @param image
     * @param dx
     * @param dy
     * @param dw
     * @param dh
     */
    static drawCircleImage(context: CanvasRenderingContext2D, image: CanvasImageSource, dx: number, dy: number, dw: number, dh: number): void;
    /**
     * 绘制背景
     * @param context
     * @param image
     * @param dx
     * @param dy
     * @param dw
     * @param dh
     */
    static drawBackground(context: CanvasRenderingContext2D, image: HTMLImageElement, dx: number, dy: number, dw: number, dh: number, radius?: number): void;
    /**
     * 绘制图像
     * @param context
     * @param image
     * @param dx
     * @param dy
     * @param dw
     * @param dh
     */
    static drawImage(context: CanvasRenderingContext2D, image: CanvasImageSource, dx: number, dy: number, dw: number, dh: number): void;
    /**
     * 绘制带有边框的矩形
     * @param context
     * @param x
     * @param y
     * @param width
     * @param height
     * @param radius
     * @param fillStyle
     * @param stroke
     */
    static drawRoundedRect: (options: {
        context: CanvasRenderingContext2D;
        x: number;
        y: number;
        width: number;
        height: number;
        radius?: number | {
            tl: number;
            tr: number;
            br: number;
            bl: number;
        };
        fillStyle?: string;
        stroke?: boolean;
    }) => void;
    /**
     * 绘制矩形
     * @param context
     * @param x
     * @param y
     * @param width
     * @param height
     * @param fillStyle
     */
    static drawRect: (context: CanvasRenderingContext2D, x: number, y: number, width: number, height: number, fillStyle: string) => void;
    /**
     * 获取文本最多行数
     * @param context
     * @param text
     * @param fontSize
     * @param maxWidth
     * @param lineHeight
     * @returns
     */
    static getTextsHeight(context: CanvasRenderingContext2D, text: string, fontSize: number, maxWidth: number, lineHeight: number, fontWeight?: IFontWeight): number;
    /**
     * 加载img
     * @param url
     * @returns
     */
    static generateCanvasImageSource: (url: string) => Promise<HTMLImageElement>;
    /**
     * 绘制文字
     * @param obj
     * @returns
     */
    static drawFont(obj: {
        canvas: HTMLCanvasElement;
        size: number;
        fontWeight?: IFontWeight;
        color?: string;
        family?: string;
        textBaseline?: CanvasTextBaseline;
        maxWidth?: number;
        maxHeight?: number;
        lineHeight?: number;
        rotate?: number;
        value: string;
        x: number;
        y: number;
        noWrap?: boolean;
        maxLines?: number;
    }): void;
    /**
     * 绘制多行文字
     * @param options
     * @returns
     */
    private static wrapText;
    /**
     * 绘制单行文字
     * @param options
     * @returns
     */
    private static noWrapText;
}