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<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="utf-8" />
<base href="../../../" />
<script src="list.js"></script>
<script src="page.js"></script>
<link type="text/css" rel="stylesheet" href="page.css" />
</head>
<body>
[page:Object3D] →
<h1>[name]</h1>
<p class="desc">用于模拟方向的3维箭头对象.</p>
<h2>例子</h2>
<div>[example:webgl_geometries WebGL / geometries]</div>
<div>[example:webgl_geometry_normals WebGL / geometry / normals]</div>
<div>[example:webgl_shadowmesh WebGL / shadowmesh]</div>
<code>
var dir = new THREE.Vector3( 1, 2, 0 );
//normalize the direction vector (convert to vector of length 1)
dir.normalize();
var origin = new THREE.Vector3( 0, 0, 0 );
var length = 1;
var hex = 0xffff00;
var arrowHelper = new THREE.ArrowHelper( dir, origin, length, hex );
scene.add( arrowHelper );
</code>
<h2>构造函数</h2>
<h3>[name]([param:Vector3 dir], [param:Vector3 origin], [param:Number length], [param:Number hex], [param:Number headLength], [param:Number headWidth] )</h3>
<p>
[page:Vector3 dir] -- 基于箭头原点的方向. 必须为单位向量. <br />
[page:Vector3 origin] -- 箭头的原点.<br />
[page:Number length] -- 箭头的长度. 默认为 *1*.<br />
[page:Number hex] -- 定义的16进制颜色值. 默认为 0xffff00.<br />
[page:Number headLength] -- 箭头头部(锥体)的长度. 默认为箭头长度的0.2倍(0.2 * length).<br />
[page:Number headWidth] -- 箭头的宽度. 默认为箭头头部(锥体)长度的0.2倍(0.2 * headLength).
</p>
<h2>属性</h2>
<p>请到基类 [page:Object3D] 页面查看公共属性.</p>
<h3>[property:Line line]</h3>
<p>包含箭头辅助对象的线段部分.</p>
<h3>[property:Mesh cone]</h3>
<p>包含箭头辅助对象的锥体部分.</p>
<h2>方法</h2>
<p>请到基类 [page:Object3D] 页面查看公共方法.</p>
<h3>[method:null setColor]([param:Color color])</h3>
<p>
color -- 所需的颜色。<br /><br />
设置箭头辅助对象的颜色.
</p>
<h3>[method:null setLength]([param:Number length], [param:Number headLength], [param:Number headWidth])</h3>
<p>
length -- 要设置的长度.<br />
headLength -- 要设置的箭头头部(锥体)的长度.<br />
headWidth -- 要设置的箭头的宽度.<br /><br />
设置箭头辅助对象的长度.
</p>
<h3>[method:null setDirection]([param:Vector3 dir])</h3>
<p>
dir -- 要设置的方向. 必须为单位向量.<br /><br />
设置箭头辅助对象的方向.
</p>
<h2>源码</h2>
<p>
[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
</p>
</body>
</html>
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