《基于MFC的OpenGL编程》Part 6 Keyboard and Mouse Control

在上一篇的基础上加入对键盘和鼠标的事件处理程序,以便用其来控制 3D 物体的旋转和移动。

1,首先在CCY457OpenGLView类中为WM_KEYDOWN, WM_LBUTTONDOWN, WM_LBUTTONUP WM_MOUSEMOVE四个事件加入事件处理函数。

2,CCY457OpenGLView.h中加入下列用于控制旋转和移动的变量:并在构造函数中初始化:

     GLfloat m_xAngle;
     GLfloat m_yAngle;
     GLfloat m_xPos;
     GLfloat m_yPos;
     CPoint m_MouseDownPoint;
CCY457OpenGLView::CCY457OpenGLView()
{
     m_xPos
= 0.0f
;
     m_yPos
= 0.0f
;
     m_xAngle
= 0.0f
;
     m_yAngle
= 0.0f
;
}

3,加入绘制代码:

void COpenGLView::RenderScene ()
{
     glLoadIdentity();
     glTranslatef(m_xPos, m_yPos,
-5.0f
);
     glRotatef(m_xAngle,
1.0f,0.0f,0.0f
);
     glRotatef(m_yAngle,
0.0f,1.0f,0.0f
);

     glutWireCube(
1.0f
);
}

4,为四个事件处理函数加入控制代码

void COpenGLView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
    
// TODO: Add your message handler code here and/or call default

    switch (nChar)
     {
        
case VK_UP:         m_yPos = m_yPos + 0.1f
;
                        
break
;
        
case VK_DOWN:     m_yPos = m_yPos - 0.1f
;
                        
break
;
        
case VK_LEFT:     m_xPos = m_xPos - 0.1f
;
                        
break
;
        
case VK_RIGHT:   m_xPos = m_xPos + 0.1f
;
                        
break
;
        
default:         MessageBox("Press the arrow keys only"
);
                        
break
;
     }        

     InvalidateRect(NULL,FALSE);
    
     CView::OnKeyDown(nChar, nRepCnt, nFlags);
}

void
COpenGLView::OnLButtonDown(UINT nFlags, CPoint point)
{
    
// TODO: Add your message handler code here and/or call default

     m_MouseDownPoint= point;
     SetCapture();
    
     CView::OnLButtonDown(nFlags, point);
}

void
COpenGLView::OnLButtonUp(UINT nFlags, CPoint point)
{
    
// TODO: Add your message handler code here and/or call default

     m_MouseDownPoint=CPoint(0,0 );
     ReleaseCapture();
    
     CView::OnLButtonUp(nFlags, point);
}

void
COpenGLView::OnMouseMove(UINT nFlags, CPoint point)
{
    
//
TODO: Add your message handler code here and/or call default
    
// Check if we have captured the mouse

    if (GetCapture()==this )
     {
        
//Increment the object rotation angles

         m_xAngle+=(point.y-m_MouseDownPoint.y)/3.6 ;
         m_yAngle
+=(point.x-m_MouseDownPoint.x)/3.6
;
        
//Redraw the view

         InvalidateRect(NULL,FALSE);
        
//Set the mouse point

         m_MouseDownPoint= point;
     };
    
     CView::OnMouseMove(nFlags, point);
}

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