import { vec2 } from "gl-matrix";
import Shape from "./shape";
/**
 * Represents a circle in 2D space with a radius and centre.
 */
export default class Circle extends Shape {
    private radius;
    /**
     * Creates a new {@link Circle} instance with a radius, position and rotation.
     *
     * @param radius The radius of the circle
     * @param centre The circle's centre in world space, default is [0, 0]
     * @param rotation The circle's rotation, default is 0.
     */
    constructor(radius: number, centre?: vec2, rotation?: number);
    /**
     * Calculates the circle's vertices relative to the provided origin in world space.
     *
     * @param origin The origin to calculate the vertices relative to, should be a world position
     * @param rotation An optional world space rotation to apply to the vertices
     * @param returnVecs Wether or not to return the vertices as vec2s or raw numbers
     * @returns The circle's vertices relative to the provided origin in world space
     */
    getVerticesWorld(origin: vec2, rotation?: number, returnVecs?: boolean): number[] | vec2[];
    /**
     * Calculates the base vertices of the circle.
     *
     * These vertices are the base vertices for a quad, scaled to the diameter of the {@link Circle} instance.
     *
     * @returns The circle's base vertices
     */
    getBaseVertices(): vec2[];
    /**
     * Gets the circle's vertex indices for drawing using element arrays.
     *
     * @param offset An offset to apply to each index
     * @returns The circle's vertex indices with the given offset added to each index
     */
    getIndices(offset?: number): Uint16Array;
    /**
     * Calculates the circle's UV coords to be used for texture rendering.
     *
     * @returns the circle's UV coords
     */
    getUVCoords(): Float32Array;
    /**
     * Scales the first vector by the components in the second vector, returning the resultant vector.
     *
     * @param v1 The first vector
     * @param v2 The second vector
     * @returns A new vector with the scaled components
     */
    private vertexScale;
    /**
     * Sets the circle's radius.
     *
     * @throws When the provided radius is < 0
     *
     * @param radius The circle's new radius
     */
    setRadius(radius: number): void;
    /**
     * Gets the radius of the circle.
     *
     * @returns The radius of the circle
     */
    getRadius(): number;
}