three 基础库
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import {
CanvasTexture,
LinearFilter,
Mesh,
MeshBasicMaterial,
PlaneGeometry,
sRGBEncoding
} from '../../../build/three.module.js';
class HTMLMesh extends Mesh {
constructor( dom ) {
const texture = new HTMLTexture( dom );
const geometry = new PlaneGeometry( texture.image.width * 0.001, texture.image.height * 0.001 );
const material = new MeshBasicMaterial( { map: texture, toneMapped: false } );
super( geometry, material );
function onEvent( event ) {
material.map.dispatchEvent( event );
}
this.addEventListener( 'mousedown', onEvent );
this.addEventListener( 'mousemove', onEvent );
this.addEventListener( 'mouseup', onEvent );
this.addEventListener( 'click', onEvent );
}
}
class HTMLTexture extends CanvasTexture {
constructor( dom ) {
super( html2canvas( dom ) );
this.dom = dom;
this.anisotropy = 16;
this.encoding = sRGBEncoding;
this.minFilter = LinearFilter;
this.magFilter = LinearFilter;
}
dispatchEvent( event ) {
htmlevent( this.dom, event.type, event.data.x, event.data.y );
this.update();
}
update() {
this.image = html2canvas( this.dom );
this.needsUpdate = true;
}
}
//
function html2canvas( element ) {
var range = document.createRange();
function Clipper( context ) {
var clips = [];
var isClipping = false;
function doClip() {
if ( isClipping ) {
isClipping = false;
context.restore();
}
if ( clips.length === 0 ) return;
var minX = - Infinity, minY = - Infinity;
var maxX = Infinity, maxY = Infinity;
for ( var i = 0; i < clips.length; i ++ ) {
var clip = clips[ i ];
minX = Math.max( minX, clip.x );
minY = Math.max( minY, clip.y );
maxX = Math.min( maxX, clip.x + clip.width );
maxY = Math.min( maxY, clip.y + clip.height );
}
context.save();
context.beginPath();
context.rect( minX, minY, maxX - minX, maxY - minY );
context.clip();
isClipping = true;
}
return {
add: function ( clip ) {
clips.push( clip );
doClip();
},
remove: function () {
clips.pop();
doClip();
}
};
}
function drawText( style, x, y, string ) {
if ( string !== '' ) {
if ( style.textTransform === 'uppercase' ) {
string = string.toUpperCase();
}
context.font = style.fontSize + ' ' + style.fontFamily;
context.textBaseline = 'top';
context.fillStyle = style.color;
context.fillText( string, x, y );
}
}
function drawBorder( style, which, x, y, width, height ) {
var borderWidth = style[ which + 'Width' ];
var borderStyle = style[ which + 'Style' ];
var borderColor = style[ which + 'Color' ];
if ( borderWidth !== '0px' && borderStyle !== 'none' && borderColor !== 'transparent' && borderColor !== 'rgba(0, 0, 0, 0)' ) {
context.strokeStyle = borderColor;
context.beginPath();
context.moveTo( x, y );
context.lineTo( x + width, y + height );
context.stroke();
}
}
function drawElement( element, style ) {
var x = 0, y = 0, width = 0, height = 0;
if ( element.nodeType === 3 ) {
// text
range.selectNode( element );
var rect = range.getBoundingClientRect();
x = rect.left - offset.left - 0.5;
y = rect.top - offset.top - 0.5;
width = rect.width;
height = rect.height;
drawText( style, x, y, element.nodeValue.trim() );
} else {
if ( element.style.display === 'none' ) return;
var rect = element.getBoundingClientRect();
x = rect.left - offset.left - 0.5;
y = rect.top - offset.top - 0.5;
width = rect.width;
height = rect.height;
style = window.getComputedStyle( element );
var backgroundColor = style.backgroundColor;
if ( backgroundColor !== 'transparent' && backgroundColor !== 'rgba(0, 0, 0, 0)' ) {
context.fillStyle = backgroundColor;
context.fillRect( x, y, width, height );
}
drawBorder( style, 'borderTop', x, y, width, 0 );
drawBorder( style, 'borderLeft', x, y, 0, height );
drawBorder( style, 'borderBottom', x, y + height, width, 0 );
drawBorder( style, 'borderRight', x + width, y, 0, height );
if ( element.type === 'color' || element.type === 'text' ) {
clipper.add( { x: x, y: y, width: width, height: height } );
drawText( style, x + parseInt( style.paddingLeft ), y + parseInt( style.paddingTop ), element.value );
clipper.remove();
}
}
/*
// debug
context.strokeStyle = '#' + Math.random().toString( 16 ).slice( - 3 );
context.strokeRect( x - 0.5, y - 0.5, width + 1, height + 1 );
*/
var isClipping = style.overflow === 'auto' || style.overflow === 'hidden';
if ( isClipping ) clipper.add( { x: x, y: y, width: width, height: height } );
for ( var i = 0; i < element.childNodes.length; i ++ ) {
drawElement( element.childNodes[ i ], style );
}
if ( isClipping ) clipper.remove();
}
var offset = element.getBoundingClientRect();
var canvas = document.createElement( 'canvas' );
canvas.width = offset.width;
canvas.height = offset.height;
var context = canvas.getContext( '2d'/*, { alpha: false }*/ );
var clipper = new Clipper( context );
// console.time( 'drawElement' );
drawElement( element );
// console.timeEnd( 'drawElement' );
return canvas;
}
function htmlevent( element, event, x, y ) {
const mouseEventInit = {
clientX: ( x * element.offsetWidth ) + element.offsetLeft,
clientY: ( y * element.offsetHeight ) + element.offsetTop,
view: element.ownerDocument.defaultView
};
window.dispatchEvent( new MouseEvent( event, mouseEventInit ) );
const rect = element.getBoundingClientRect();
x = x * rect.width + rect.left;
y = y * rect.height + rect.top;
function traverse( element ) {
if ( element.nodeType !== 3 ) {
const rect = element.getBoundingClientRect();
if ( x > rect.left && x < rect.right && y > rect.top && y < rect.bottom ) {
element.dispatchEvent( new MouseEvent( event, mouseEventInit ) );
}
for ( var i = 0; i < element.childNodes.length; i ++ ) {
traverse( element.childNodes[ i ] );
}
}
}
traverse( element );
}
export { HTMLMesh };