| timeStart | 线性曲线的开始时间。 |
| valueStart | 线性曲线的开始值。 |
| timeEnd | 线性曲线的结束时间。 |
| valueEnd | 线性曲线的结束值。 |
AnimationCurve The (straight) curve created from the values specified.
以 timeStart, valueStart 开始、在 timeEnd, valueEnd 结束的直线。
This is something of an oxymoron as the generated "curve" is actually a straight line, however it is still called a "curve" and represented by an AnimationCurve object.