Keyframe.inTangent

Description

设置此关键帧的传入切线。传入切线会影响从上一个关键帧到此关键帧的曲线斜率。

传入切线与曲线的传入斜率匹配。inTangent 的正值会形成向下切线，而负值会形成向上切线。

另请参阅：outTangent。

using UnityEngine;

public class KeyFrameTangentExample : MonoBehaviour
{
    AnimationCurve  animCurve = null;

    void Start()
    {
        Keyframe[] ks = new Keyframe[3];

        ks[0] = new Keyframe(0, 0);
        ks[0].inTangent = 5f;    // -5 units on the y axis for 1 unit on the x axis.

        ks[1] = new Keyframe(4, 0);
        ks[1].inTangent = 0f;    // straight

        ks[2] = new Keyframe(6, 0);
        ks[2].inTangent = -5f;    // +5 units on the y axis for 1 unit on the x axis.

        animCurve = new AnimationCurve(ks);
    }

    void Update()
    {
        if (animCurve != null)
            transform.position = new Vector3(Time.time, animCurve.Evaluate(Time.time), 0);
    }
}