import { ScreenBounds } from "../common/screen-bounds";
import { ScreenXY } from "../common/screen-xy";
import { PointSymbol } from "./symbol";
/**
 * 字符符号
 * @remarks
 * 中英文皆可，注意控制长度，推荐单个字符
 */
export declare class LetterSymbol extends PointSymbol {
    /**
     * 外圈半径
     */
    radius: number;
    /**
     * 字符，中英文皆可，推荐单个字符
     */
    letter: string;
    /**
     * 字体颜色
     */
    fontColor: string;
    /**
     * 字体大小
     */
    fontSize: number;
    /**
     * 字体
     */
    fontFamily: string;
    /**
     * 字体粗细
     */
    fontWeight: string;
    /**
     * 绘制字符符号
     * @param {CanvasRenderingContext2D} ctx - 绘图上下文
     * @param {ScreenXY} screenXY - 屏幕坐标
     */
    draw(ctx: CanvasRenderingContext2D, screenXY: ScreenXY): void;
    /**
     * 获取包络矩形
     * @param {ScreenXY} screenXY - 屏幕坐标
     */
    getScreenBounds(screenXY: ScreenXY): ScreenBounds;
}