Accueil / npm / three@0.186.1 / examples / jsm / webxr / Text2D.js
Text2D.js
import { DoubleSide, Mesh, MeshBasicMaterial, PlaneGeometry, Texture } from 'three';
/**
* @module Text2D
* @three_import import * as Text2D from 'three/addons/webxr/Text2D.js';
*/
/**
* A helper function for creating a simple plane mesh
* that can be used as a text label. The mesh's material
* holds a canvas texture that displays the given message.
*
* @param {string} message - The message to display.
* @param {number} height - The labels height.
* @return {Mesh} The plane mesh representing a text label.
*/
function createText( message, height ) {
const canvas = document.createElement( 'canvas' );
const context = canvas.getContext( '2d' );
let metrics = null;
const textHeight = 100;
context.font = 'normal ' + textHeight + 'px Arial';
metrics = context.measureText( message );
const textWidth = metrics.width;
canvas.width = textWidth;
canvas.height = textHeight;
context.font = 'normal ' + textHeight + 'px Arial';
context.textAlign = 'center';
context.textBaseline = 'middle';
context.fillStyle = '#ffffff';
context.fillText( message, textWidth / 2, textHeight / 2 );
const texture = new Texture( canvas );
texture.needsUpdate = true;
const material = new MeshBasicMaterial( {
color: 0xffffff,
side: DoubleSide,
map: texture,
transparent: true,
} );
const geometry = new PlaneGeometry(
( height * textWidth ) / textHeight,
height
);
const plane = new Mesh( geometry, material );
return plane;
}
export { createText };