<!DOCTYPE html> <html lang="zh"> <head> <meta charset="utf-8" /> <base href="../../../" /> <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>代码示例</h2> <code> const dir = new THREE.Vector3( 1, 2, 0 ); //normalize the direction vector (convert to vector of length 1) dir.normalize(); const origin = new THREE.Vector3( 0, 0, 0 ); const length = 1; const hex = 0xffff00; const arrowHelper = new THREE.ArrowHelper( dir, origin, length, hex ); scene.add( arrowHelper ); </code> <h2>例子</h2> <p> [example:webgl_shadowmesh WebGL / shadowmesh] </p> <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] -- The width of the head of the arrow. Default is 0.2 * headLength.<br /> </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:undefined 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:undefined 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 -- The width of the head of the arrow.<br /><br /> 设置箭头辅助对象的长度. </p> <h3>[method:undefined 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>