/**
 * CrosshairTool - Crosshair positioning and cursor point conversion
 *
 * Extracted from DrawToolCore.ts:
 * - enableCrosshair
 * - convertCursorPoint
 * - setUpSphereOrigins
 */
import { BaseTool } from "./BaseTool";
import type { IConvertObjType } from "../core/types";
export declare class CrosshairTool extends BaseTool {
    enableCrosshair(): void;
    /**
     * Convert cursor point between axis views.
     *
     * MRI slices are generated from threejs based on mm, but displayed based on pixel distance.
     * The index number on each axis is the slice's depth in mm distance.
     * Width/height on screen is in pixel distance.
     *
     * When switching views, we convert depth to pixel distance and vice versa.
     *
     * @param from Current view axis
     * @param to Target view axis
     * @param cursorNumX Cursor X on current axis (pixel distance)
     * @param cursorNumY Cursor Y on current axis (pixel distance)
     * @param currentSliceIndex Current slice depth (mm distance)
     */
    convertCursorPoint(from: "x" | "y" | "z", to: "x" | "y" | "z", cursorNumX: number, cursorNumY: number, currentSliceIndex: number): IConvertObjType | undefined;
    /**
     * Render crosshair lines on the drawing context.
     * Called from the start() render loop when crosshair mode is active.
     *
     * @param ctx - The drawing canvas 2D context
     * @param width - Canvas width (changedWidth)
     * @param height - Canvas height (changedHeight)
     */
    renderCrosshair(ctx: CanvasRenderingContext2D, width: number, height: number): void;
    private drawLine;
    setUpSphereOrigins(mouseX: number, mouseY: number, sliceIndex: number): void;
}