Cesium JS API
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Cesium ConstantSpline 文档

概述

Cesium ConstantSpline 是一种用于对输入点的一次插值进行平滑插值的插值方法。插值算法基于重复一组数值序列的方法来创建连续的函数。此算法在cesiumjs中主要用于补充在样条曲线中缺失的点。

方法

Constructor

new ConstantSpline(options)

使用 options 创建一个新的 ConstantSpline 对象。

options 是一个包含以下属性的对象:

  • points:一个包含一组要插值的点的数组。
  • firstTangent:三维向量,表示第一条线段的斜率。默认值为 (0,0,0)
  • lastTangent:三维向量,表示最后一条线段的斜率。默认值为 (0,0,0)

Properties

getPoints() 返回 ConstantSpline 曲线中的所有点。

Methods

evaluate(t, result) 在曲线上计算给定点的值。

t 是要计算的点。result 是将计算结果存储的可选对象。如果没有提供 result,则会创建一个新的 Cesium.Cartesian3 对象作为结果。

示例

var spline = new Cesium.ConstantSpline({
    points : [new Cesium.Cartesian3(1.0, 0.0, 0.0),
              new Cesium.Cartesian3(-1.0, 0.0, 0.0)]
});

var point = new Cesium.Cartesian3();
spline.evaluate(0.5, point);
console.log(point); // (-0.5, 0.0, 0.0)

参考文献