基于MFC，用OpenGL把物体绕世界坐标系的单根轴连续旋转问题

章鱼小八 2018-12-20 07:03:06

要求：选择旋转的坐标轴，鼠标拖动模型绕该坐标轴旋转；要求是多次操作，模型可以连续绕不动的世界坐标系的坐标轴旋转，切换坐标轴，模型能够接着上次的位置继续旋转。

我先画出了绘图坐标系和世界坐标系。
我发现我运行程序后，选择旋转轴的顺序不同会有不同的结果，比如先选绕Z轴转（此时分辨不出，因为绘图坐标系与世界坐标系重合），然后选择绕X,Y轴转都是按照世界坐标系，但是再选绕Z轴转，却是绕绘图坐标系的Z轴。

以上是一些代码的顺序，先画世界坐标系，再调用旋转函数，在画绘图坐标系和模型。

以上是绕不同轴旋转的函数，我发现哪一个放在最下面，则它一定是按照绘图坐标系转而不是世界坐标系，并且先执行它，则其他两个正确。

以下是主要的代码，环境搭建的我都删了，以下是实现功能的，大佬帮我看看问题出在哪儿？能不能用简单一点的方法达到我的要求？我也是初学者~



CMy001View::CMy001View()

{

	// TODO: add construction code here

	xMax= 100;

	xMin=-100;

	yMax= 100;

	yMin=-100;

	zMax=500;

	zMin=-50;





	m_bInMouseRotate=0;

	m_LeftDownPos=(0,0);

	m_xRotate=0;

	m_yRotate=0;

	m_zRotate=0;

	m_xMouseRotation=0;

	m_yMouseRotation=0;

	m_zMouseRotation=0;



}





void CMy001View::OnDraw(CDC* pDC)

{

	CMy001Doc* pDoc = GetDocument();

	ASSERT_VALID(pDoc);

	// TODO: add draw code for native data here

	HDC hdc;

	HGLRC rc;

	glDrawBuffer(GL_BACK);

	//GetCurrent(hdc, rc);//Store current rendering and device contexts

	//MakeActive();//Make view's rendering context current

	::glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

	SetupOrtho();

	::glPushMatrix();

	

	

	gluLookAt(200.0,200.0,200.0,0.0,0.0,0.0,  0.0,0.0,1.0);//定义观察坐标系





	glBegin(GL_LINES);//世界坐标系



	glColor3f(0.0,0.0,1.0);

	glVertex3f( 0.0, 0.0, 0.0);        

	glVertex3f( 60.0, 0.0, 0.0);



	glColor3f(0.0,1.0,0.0);

	glVertex3f( 0.0, 0.0, 0.0);       

	glVertex3f( 0.0, 60.0, 0.0);



	glColor3f(1.0,0.0,0.0);

	glVertex3f( 0.0, 0.0, 0.0);        

	glVertex3f( 0.0, 0.0, 60.0);



	glEnd();





	DoMouseRotate();//坐标旋转变换



	

	glBegin(GL_LINES);//模型坐标系



	glColor3f(0.0,0.0,1.0);

	glVertex3f( 0.0, 0.0, 0.0);        

	glVertex3f( 60.0, 0.0, 0.0);



	glColor3f(0.0,1.0,0.0);

	glVertex3f( 0.0, 0.0, 0.0);       

	glVertex3f( 0.0, 60.0, 0.0);



	glColor3f(1.0,0.0,0.0);

	glVertex3f( 0.0, 0.0, 0.0);        

	glVertex3f( 0.0, 0.0, 60.0);



	glEnd();



	RenderScene(); //画一个正方体





	//在这里添加绘图的函数

	::glPopMatrix();



	// Tell OpenGL to flush its pipeline

	::glFinish();

	

	// Now Swap the buffers

	if ( FALSE == ::SwapBuffers(m_pDC->GetSafeHdc()))

		return;

}



/////////////////////////////////////////////////////////////////////////////

// CMy001View printing





void CMy001View::DoMouseRotate()

{		

	

		glRotatef(m_xMouseRotation, 1.0, 0.0, 0.0);

		glRotatef(m_yMouseRotation, 0.0, 1.0, 0.0);

		glRotatef(m_zMouseRotation, 0.0, 0.0, 1.0);

	

}







void CMy001View::OnLButtonDown(UINT nFlags, CPoint point) 

{

	// TODO: Add your message handler code here and/or call default

	if(m_bool==1)

	{

		trackball_MouseDown(point);

	}





	CView::OnLButtonDown(nFlags, point);

}

	void CMy001View::trackball_MouseDown(CPoint point)

{

	m_LeftDownPos = point;//将该值赋给变量m_LeftDownPos

	SetCapture();

	::SetCursor(LoadCursor(NULL, IDC_SIZEALL));

	m_bInMouseRotate=TRUE;//////////////////

	



}



void CMy001View::OnMouseMove(UINT nFlags, CPoint point) 

{

	// TODO: Add your message handler code here and/or call default

	

	if(m_bInMouseRotate==true)

	{

		trackball_MouseMove(point);//获得鼠标点的坐标，并调用trackball_MouseMove()

	}







	CView::OnMouseMove(nFlags, point);

}



void CMy001View::trackball_MouseMove(CPoint point)

{

	ASSERT(GetCapture()==this);

	::SetCursor(LoadCursor(NULL, IDC_SIZEALL));

	if(m_bInMouseRotate==true)

	{	

		if(m_xRotate==1)

		{

			m_xMouseRotation -= (float)(m_LeftDownPos.x - point.x)/3.0f;

		}

		if(m_yRotate==1)

		{

			m_yMouseRotation -= (float)(m_LeftDownPos.x - point.x)/3.0f;

		}

		if(m_zRotate==1)

		{

			m_zMouseRotation -= (float)(m_LeftDownPos.x - point.x)/3.0f;

		}





		m_LeftDownPos = point;

	}

	

	InvalidateRect(NULL,FALSE);

}



void CMy001View::OnLButtonUp(UINT nFlags, CPoint point) 

{

	// TODO: Add your message handler code here and/or call default

	if(m_bInMouseRotate==true)

	{

		trackball_MouseUp(point);//获得鼠标点的坐标，并调用trackball_MouseUp()

		

	}



	CView::OnLButtonUp(nFlags, point);

}

void CMy001View::trackball_MouseUp(CPoint point)

{

	//m_LeftDownPos = CPoint(0,0);	// forget where we clicked

	//m_LeftUpPos=point;

	ReleaseCapture();

	m_bInMouseRotate=FALSE;

	

}



void CMy001View::OnxRotate() 

{

	// TODO: Add your command handler code here

	m_xRotate=1;

	m_yRotate=0;

	m_zRotate=0;

	m_bool=1;

}



void CMy001View::OnyRotate() 

{

	// TODO: Add your command handler code here

	m_yRotate=1;

	m_xRotate=0;

	m_zRotate=0;

	m_bool=1;

}



void CMy001View::OnzRotate() 

{

	// TODO: Add your command handler code here

	m_zRotate=1;

	m_xRotate=0;

	m_yRotate=0;

	m_bool=1;

}

void CMy001View::RenderScene()

{



	

	cube();

}



void CMy001View::cube()

{	





	glBegin(GL_LINES);//画一个正方体

     

    glVertex3f( 0.0, 0.0, 0.0);        

	glVertex3f( 30.0, 0.0, 0.0);        

	glVertex3f( 0.0, 0.0, 0.0);        

	glVertex3f( 0.0, 30.0, 0.0);  

	glVertex3f( 30.0, 30.0, 0.0);        

	glVertex3f( 30.0, 0.0, 0.0);  

	glVertex3f( 30.0, 30.0, 0.0);        

	glVertex3f( 0.0, 30.0, 0.0);  



	glVertex3f( 0.0, 0.0, 0.0);        

	glVertex3f( 0.0, 0.0, 30.0);        

	glVertex3f( 30.0, 0.0, 0.0);        

	glVertex3f( 30.0, 0.0, 30.0);  

	glVertex3f( 0.0, 30.0, 0.0);        

	glVertex3f( 0.0, 30.0, 30.0);  

	glVertex3f( 30.0, 30.0, 0.0);        

	glVertex3f( 30.0, 30.0, 30.0);  



	glVertex3f( 0.0, 0.0, 30.0);        

	glVertex3f( 30.0, 0.0, 30.0);        

	glVertex3f( 0.0, 0.0, 30.0);        

	glVertex3f( 0.0, 30.0, 30.0);  

	glVertex3f( 30.0, 30.0, 30.0);        

	glVertex3f( 0.0, 30.0, 30.0);  

	glVertex3f( 30.0, 30.0, 30.0);        

	glVertex3f( 30.0, 0.0, 30.0); 



	glEnd();

}