C++ ViewExp::MapScreenToView方法代码示例

//.........这里部分代码省略.........
	}

	// Show quick preview
	if(_options->getQuickView()){

		float fNear = 1.0f;
		float fFar = 1000.0f;

		// Get the active viewport and the win32 window within it.
		// The position and size will be retreive from this.
		ViewExp* viewExp = _ip->GetActiveViewport();
		float fov = viewExp->GetFOV();
		HWND hWnd = viewExp->getGW()->getHWnd();
		RECT sRect;
		BOOL ok = GetWindowRect(hWnd, &sRect);
		int width = 100;
		int height = 100;
		int x =100;
		int y =100;
		if(ok){
			x = sRect.left;
			y = sRect.top;
			width = sRect.right - sRect.left;
			height = sRect.bottom - sRect.top;
		}

		// Create previewer window and set size.
		Previewer previewer;
		previewer.setWindowSize(x, y, width, height);


		// The affine TM transforms from world coords to view coords
		// so we need the inverse of this matrix
		Matrix3 aTM, camTM, coordSysTM;
		Point3 viewDir, viewPos, lookAtPos, upVector;
		INode* camera;
		float dist = 100;

		Point3 upperLeft = viewExp->MapScreenToView(IPoint2(0, 0), fFar);
		Point3 lowerRight = viewExp->MapScreenToView(IPoint2(width, height), fFar);
		
		viewExp->GetAffineTM(aTM);
		coordSysTM = Inverse(aTM);	

		viewDir = coordSysTM.VectorTransform(Point3(0.0f, 0.0f, -1.0f));
		viewPos = coordSysTM.GetRow(3);
		lookAtPos = viewPos + viewDir;
		upVector.Set(0.0f, 0.0f, 1.0f);

		switch(viewExp->GetViewType()){
			case VIEW_ISO_USER:
			case VIEW_PERSP_USER:
				previewer.setProjectionMatrixAsFrustum(lowerRight.x, upperLeft.x,  upperLeft.y, lowerRight.y, fFar, -fFar);
				break;
			case VIEW_CAMERA:
				previewer.setProjectionMatrixAsFrustum(upperLeft.x, lowerRight.x, lowerRight.y, upperLeft.y, fFar, -fFar);
				camera = viewExp->GetViewCamera();
				camTM = camera->GetObjTMBeforeWSM(_ip->GetTime());
				viewDir = camTM.VectorTransform(Point3(0.0f, 0.0f, -1.0f));
				viewPos = camTM.GetRow(3);
				lookAtPos = viewPos + viewDir;
				break;
			case VIEW_LEFT:
			case VIEW_RIGHT:
			case VIEW_TOP:
			case VIEW_BOTTOM:
			case VIEW_FRONT:
			case VIEW_BACK:
				previewer.setProjectionMatrixAsOrtho(upperLeft.x, lowerRight.x, lowerRight.y, upperLeft.y, -fFar, fFar);
				//cam->setOrtho(upperLeft.x, lowerRight.x, lowerRight.y, upperLeft.y, -fFar, fFar);
				// Go far away from the viewing point in the negative viewing direction.
				viewPos = coordSysTM.PointTransform(Point3(0.0f, 0.0f, fFar));
				lookAtPos = viewPos + viewDir;
				// In top view the up vector on the camera is the positive y-axis.
				if(viewExp->GetViewType() == VIEW_TOP)
					upVector.Set(0.0f, 1.0f, 0.0f);
				// In bottom view the up vector on the camera is the negative y-axis.
				if(viewExp->GetViewType() == VIEW_BOTTOM)
					upVector.Set(0.0f, -1.0f, 0.0f);
				break;
		}
		// When we are done with the viewport we should release it.
		_ip->ReleaseViewport(viewExp);

		// Set scene data.
		previewer.setSceneData(rootTransform.get());

		// set the view - OpenGL look at
		previewer.setViewMatrixAsLookAt(osg::Vec3( viewPos.x, viewPos.y, viewPos.z),
										 osg::Vec3(lookAtPos.x, lookAtPos.y, lookAtPos.z),
										 osg::Vec3(upVector.x, upVector.y, upVector.z) );
 		previewer.run();

		isExporting = FALSE;
		return TRUE;
	}
}
	isExporting = FALSE;
	return TRUE;
}