C++ Trackball::updatePositionNeg方法代码示例

void motion(int x, int y)
{   
    OSG::Real32 w = win->getWidth(), h = win->getHeight();
    

    OSG::Real32  a = -2. * ( lastx / w - .5 ),
                 b = -2. * ( .5 - lasty / h ),
                 c = -2. * ( x / w - .5 ),
                 d = -2. * ( .5 - y / h );

    if ( mouseb & ( 1 << GLUT_LEFT_BUTTON ) )
    {
        tball.updateRotation( a, b, c, d );     
    }
    else if ( mouseb & ( 1 << GLUT_MIDDLE_BUTTON ) )
    {
        tball.updatePosition( a, b, c, d );     
    }
    else if ( mouseb & ( 1 << GLUT_RIGHT_BUTTON ) )
    {
        tball.updatePositionNeg( a, b, c, d );  
    }
    lastx = x;
    lasty = y;
}

void MyOSGQGLWidget::mouseMoveEvent(QMouseEvent *me)
{
    OSG::Real32 w = osgWin->getWidth();  // force the calc to Real32
    OSG::Real32 h = osgWin->getHeight();

    OSG::Real32 a = -2. * (lastx / w - .5 );
    OSG::Real32 b = -2. * (.5 - lasty / h );
    OSG::Real32 c = -2. * (me->pos().x() / w - .5);
    OSG::Real32 d = -2. * (.5 - me->pos().y() / h);

    if(mouseb & Qt::LeftButton)
    {
        tball.updateRotation(a, b, c, d);
    }
    else if(mouseb & Qt::MidButton)
    {
        tball.updatePosition(a, b, c, d);
    }
    else if(mouseb & Qt::RightButton)
    {
        tball.updatePositionNeg(a, b, c, d);
    }

    lastx = me->pos().x();
    lasty = me->pos().y();
    
    updateGL();
}

void motion(int x, int y)
{
	float w = win->getWidth(),
		  h = win->getHeight();

	float	a = -2 * ( lastx / w - 0.5 ),
			b = -2 * ( 0.5 - lasty / h ),
			c = -2 * ( x / w - 0.5 ),
			d = -2 * ( 0.5 - y / h );

	if ( mouseb & ( 1 << GLUT_LEFT_BUTTON ) )
	{
		trackball.updateRotation( a, b, c, d );
	}
	else if ( mouseb & ( 1 << GLUT_MIDDLE_BUTTON ) )
	{
		trackball.updatePosition( a, b, c, d );
	}
	else if ( mouseb & ( 1 << GLUT_RIGHT_BUTTON ) )
	{
		trackball.updatePositionNeg( a, b, c, d );
	}
	lastx = x;
	lasty = y;
}

static OSStatus handleMouseEvent(EventHandlerCallRef nextHandler, EventRef event, void *userData)
{
    OSStatus err;
    OSG::Real32 w,h,a,b,c,d;

    // Get the pressed mouse button
    EventMouseButton mouseButton;
    err = GetEventParameter(event, kEventParamMouseButton, typeMouseButton, 0, sizeof(mouseButton), 0, &mouseButton);
    if (err != noErr)
        return err;

    // Get the modifier keys
    ::UInt32 modifierKeys;
    err = GetEventParameter(event, kEventParamKeyModifiers, typeUInt32, 0, sizeof(modifierKeys), 0, &modifierKeys);
    if (err != noErr)
        return err;

    // Traditionally, Apple mice just have one button. It is common practice to simulate
    // the middle and the right button by pressing the option or the control key.
    if (mouseButton == kEventMouseButtonPrimary)
    {
        if (modifierKeys & optionKey)
            mouseButton = kEventMouseButtonTertiary;
        if (modifierKeys & controlKey)
            mouseButton = kEventMouseButtonSecondary;
    }

    // Get the location of the mouse pointer
    ::Point location;
    err = GetEventParameter(event, kEventParamMouseLocation, typeQDPoint, 0, sizeof(location), 0, &location);
    if (err != noErr)
        return err;

    // Handle the different kinds of events
    ::UInt32 eventKind = GetEventKind(event);
    switch (eventKind)
    {
    // mouse button pressed
    case kEventMouseDown:
        lastx = location.h;
        lasty = location.v;
        switch (mouseButton)
        {
        case kEventMouseButtonPrimary: // left button
            break;
        case kEventMouseButtonSecondary: // right button
            tball.setAutoPositionNeg(true);
            break;
        case kEventMouseButtonTertiary: // middle button
            tball.setAutoPosition(true);
            break;
        }
        break;

    // mouse button released
    case kEventMouseUp:
        switch (mouseButton)
        {
        case kEventMouseButtonPrimary: // left button
            break;
        case kEventMouseButtonSecondary: // right button
            tball.setAutoPositionNeg(false);
            break;
        case kEventMouseButtonTertiary: // middle button
            tball.setAutoPosition(false);
            break;
        }
        break;

    // mouse moved while a button is pressed
    case kEventMouseDragged:
        w = win->getWidth();
        h = win->getHeight();
        a = -2. * ( lastx / w - .5 );
        b = -2. * ( .5 - lasty / h );
        c = -2. * ( location.h / w - .5 );
        d = -2. * ( .5 - location.v / h );
        switch (mouseButton)
        {
        case kEventMouseButtonPrimary: // left button
            tball.updateRotation( a, b, c, d );
            break;
        case kEventMouseButtonSecondary: // right button
            tball.updatePositionNeg( a, b, c, d );
            break;
        case kEventMouseButtonTertiary: // middle button
            tball.updatePosition( a, b, c, d );
            break;
        }
        lastx = location.h;
        lasty = location.v;

        // Redraw the whole window
        redraw();

        break;
    }

    // We have to return eventNotHandledErr, otherwise the system is
    // not able to operate the menu and the window border
//.........这里部分代码省略.........