【MSCE C++】在相机模式下，利用代码实现窗口之间的联合显示时，窗口发生抖动

Question

void MyIViewMonitor::_OnViewChanged(ViewportP viewport)
{	
	if (m_isSelfFire)
	{
 return;
	}
	if (MyIViewMonitor::m_toolType == 3){
 if (viewport->GetViewNumber() == 2) {	
 Dpoint3d position;
 Dpoint3d target;
 Dpoint3d upVector;
 double angle;
 DRange2d screenWindow;
 double frontClipDist;
 double backClipDist;
 mdlView_getCameraParameters(&position, &target, &upVector, &angle, &screenWindow, &frontClipDist, &backClipDist, 2); //得到视图3相机参数
 if (!mdlView_getDisplayControl(VIEWCONTROL_CAMERA, 0))	mdlView_setDisplayControl(VIEWCONTROL_CAMERA, 0, true); //打开视图1相机
 mdlView_setCameraParameters(&position, &target, &upVector, &angle, NULL, &screenWindow, &frontClipDist, &backClipDist, 0); //设置视图1相机
 m_isSelfFire = true;
 mdlView_updateSingle(0);//更新视图1
 m_isSelfFire = false;
 }
 return;
	}
} 这段代码是实现视图3和视图1之间的联动显示，需要先手动打开视图3的相机模式，联动显示时，平移和缩放都正常，旋转时视图1发生抖动，非常影响联合显示效果，请问怎么优化代码来解决这个问题。

HongQiang Guo · Accepted Answer

抖动是因为动态旋转过程中，每一帧显示以后后台又会把视图的参数恢复到动态开始时的状态，您可以利用如下代码示例这样控制一下即可： 
 
	bool m_isSelfFire;
	DPoint3d m_position;
	DPoint3d m_target;
	DPoint3d m_upVector;
	double m_angle = DBL_MIN;
	DRange2d m_screenWindow;
	double m_frontClipDist;
	double m_backClipDist;
	virtual void _OnViewChanged(ViewportP viewport) override
	{
 if (m_isSelfFire)
 return;
 if (viewport->GetViewNumber() == 2)
 {
 static bool isRestore = false;
 if (isRestore)
 {
 isRestore = false;
 return;
 }
 isRestore = true;
 DPoint3d position,target,upVector;
 double angle, frontClipDist, backClipDist;
 DRange2d screenWindow;
 mdlView_getCameraParameters(&position, &target, &upVector, &angle, &screenWindow, &frontClipDist, &backClipDist, 2);
 if (DBL_MIN != m_angle)
 {
 if (m_position == position && m_target == target && m_upVector == upVector && m_angle == angle &&
 m_screenWindow.low == screenWindow.low && m_screenWindow.high == screenWindow.high && m_frontClipDist == frontClipDist && m_backClipDist == backClipDist)
 {
 isRestore = false;
 return;
 }
 }
 m_position = position;m_target = target;m_upVector = upVector;m_angle = angle;m_screenWindow = screenWindow;m_frontClipDist = frontClipDist;m_backClipDist = backClipDist;
 if(!mdlView_getDisplayControl(VIEWCONTROL_CAMERA,0))
 mdlView_setDisplayControl(VIEWCONTROL_CAMERA, 0, true);
 mdlView_setCameraParameters(&position, &target, &upVector, &angle, NULL, &screenWindow, &frontClipDist, &backClipDist, 0);
 m_isSelfFire = true;
 mdlView_updateSingle(0);
 m_isSelfFire = false;
 }
 return;
	} 
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【MSCE C++】在相机模式下，利用代码实现窗口之间的联合显示时，窗口发生抖动

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