private void drag(Point MousePt)
{
Quat4f ThisQuat = new Quat4f();
arcBall.drag(MousePt, ThisQuat); // Update End Vector And Get Rotation As Quaternion
lock (matrixLock)
{
//lock 的目的很明确：就是不想让别人使用这段代码，
//体现在多线程情况下，只允许当前线程执行该代码区域，
//其他线程等待直到该线程执行结束；这样可以多线程避免同时使用某一方法造成数据混乱。
ThisRot.Rotation = ThisQuat; // Convert Quaternion Into Matrix3fT
ThisRot.mul(ThisRot, LastRot); // Accumulate Last Rotation Into This One
}
}
private void drag(Point MousePt)
{
Quat4f ThisQuat = new Quat4f();
arcBall.drag(MousePt, ThisQuat); // Update End Vector And Get Rotation As Quaternion
lock (matrixLock)
{
ThisRot.Rotation = ThisQuat; // Convert Quaternion Into Matrix3fT
ThisRot.mul(ThisRot, LastRot); // Accumulate Last Rotation Into This One
}
}
