HandleUtility.CalcLineTranslation 计算线条转换

static function CalcLineTranslation (src : Vector2, dest : Vector2, srcPosition : Vector3, constraintDir : Vector3) : float

Parameters参数

• src
  the source point of the drag //拖拽的源点
• dest
  the destination point of the drag //拖拽的目标点
• srcPosition
  the 3D position the dragged object had at src ray.
  在src射线拖拽物体的3D位置
• constraintDir
  3D direction of constrained movement
  约束移动的3D方向

float - the distance travelled along constraintDir

返回浮点数，沿constraintDir的移动距离

Description描述

Helper function for doing arrows.

做箭头的辅助函数。