C++ LLBBox::getCenterAgent方法代码示例

// only works for our specialized (AABB, position centered) bboxes
BOOL bbox_overlap(LLBBox bbox1, LLBBox bbox2)
{
	const F32 FUDGE = 0.001f;  // because of SL precision/rounding
	
	LLVector3 delta = bbox1.getCenterAgent() - bbox2.getCenterAgent();

	LLVector3 half_extent = (bbox1.getExtentLocal() + bbox2.getExtentLocal()) / 2.0;

	return ((fabs(delta.mV[VX]) < half_extent.mV[VX] - FUDGE) &&
			(fabs(delta.mV[VY]) < half_extent.mV[VY] - FUDGE) &&
			(fabs(delta.mV[VZ]) < half_extent.mV[VZ] - FUDGE));
}

void setup_transforms_bbox(LLBBox bbox)
{
	// translate to center
	LLVector3 center = bbox.getCenterAgent();
	gGL.translatef(center.mV[VX], center.mV[VY], center.mV[VZ]);

	// rotate
	LLQuaternion rotation = bbox.getRotation();
	F32 angle_radians, x, y, z;
	rotation.getAngleAxis(&angle_radians, &x, &y, &z);
	gGL.flush();
	gGL.rotatef(angle_radians * RAD_TO_DEG, x, y, z); 

	// scale
	LLVector3 scale = bbox.getMaxLocal() - bbox.getMinLocal();
	gGL.scalef(scale.mV[VX], scale.mV[VY], scale.mV[VZ]);
}

void setup_transforms_bbox(LLBBox bbox)
{
	// translate to center
	LLVector3 center = bbox.getCenterAgent();
	gGL.translatef(center.mV[VX], center.mV[VY], center.mV[VZ]);

	// rotate
	LLQuaternion rotation = bbox.getRotation();
	F32 angle_radians, x, y, z;
	rotation.getAngleAxis(&angle_radians, &x, &y, &z);
	// gGL has no rotate method (despite having translate and scale) presumably because
	// its authors smoke crack.  so we hack.
	gGL.flush();
	glRotatef(angle_radians * RAD_TO_DEG, x, y, z); 

	// scale
	LLVector3 scale = bbox.getMaxLocal() - bbox.getMinLocal();
	gGL.scalef(scale.mV[VX], scale.mV[VY], scale.mV[VZ]);
}

// This function selects an ideal viewing distance based on the focused object, pick normal, and padding value
void LLViewerMediaFocus::setCameraZoom(LLViewerObject* object, LLVector3 normal, F32 padding_factor, bool zoom_in_only)
{
	if (object)
	{
		gAgentCamera.setFocusOnAvatar(FALSE, ANIMATE);

		LLBBox bbox = object->getBoundingBoxAgent();
		LLVector3d center = gAgent.getPosGlobalFromAgent(bbox.getCenterAgent());
		F32 height;
		F32 width;
		F32 depth;
		F32 angle_of_view;
		F32 distance;

		// We need the aspect ratio, and the 3 components of the bbox as height, width, and depth.
		F32 aspect_ratio = getBBoxAspectRatio(bbox, normal, &height, &width, &depth);
		F32 camera_aspect = LLViewerCamera::getInstance()->getAspect();
		
		lldebugs << "normal = " << normal << ", aspect_ratio = " << aspect_ratio << ", camera_aspect = " << camera_aspect << llendl;

		// We will normally use the side of the volume aligned with the short side of the screen (i.e. the height for 
		// a screen in a landscape aspect ratio), however there is an edge case where the aspect ratio of the object is 
		// more extreme than the screen.  In this case we invert the logic, using the longer component of both the object
		// and the screen.  
		bool invert = (camera_aspect > 1.0f && aspect_ratio > camera_aspect) ||
			(camera_aspect < 1.0f && aspect_ratio < camera_aspect);

		// To calculate the optimum viewing distance we will need the angle of the shorter side of the view rectangle.
		// In portrait mode this is the width, and in landscape it is the height.
		// We then calculate the distance based on the corresponding side of the object bbox (width for portrait, height for landscape)
		// We will add half the depth of the bounding box, as the distance projection uses the center point of the bbox.
		if(camera_aspect < 1.0f || invert)
		{
			angle_of_view = llmax(0.1f, LLViewerCamera::getInstance()->getView() * LLViewerCamera::getInstance()->getAspect());
			distance = width * 0.5 * padding_factor / tan(angle_of_view * 0.5f );

			lldebugs << "using width (" << width << "), angle_of_view = " << angle_of_view << ", distance = " << distance << llendl;
		}
		else
		{
			angle_of_view = llmax(0.1f, LLViewerCamera::getInstance()->getView());
			distance = height * 0.5 * padding_factor / tan(angle_of_view * 0.5f );

			lldebugs << "using height (" << height << "), angle_of_view = " << angle_of_view << ", distance = " << distance << llendl;
		}

		distance += depth * 0.5;

		// Finally animate the camera to this new position and focal point
		LLVector3d camera_pos, target_pos;
		// The target lookat position is the center of the selection (in global coords)
		target_pos = center;
		// Target look-from (camera) position is "distance" away from the target along the normal 
		LLVector3d pickNormal = LLVector3d(normal);
		pickNormal.normalize();
        camera_pos = target_pos + pickNormal * distance;
        if (pickNormal == LLVector3d::z_axis || pickNormal == LLVector3d::z_axis_neg)
        {
			// If the normal points directly up, the camera will "flip" around.
			// We try to avoid this by adjusting the target camera position a 
			// smidge towards current camera position
			// *NOTE: this solution is not perfect.  All it attempts to solve is the
			// "looking down" problem where the camera flips around when it animates
			// to that position.  You still are not guaranteed to be looking at the
			// media in the correct orientation.  What this solution does is it will
			// put the camera into position keeping as best it can the current 
			// orientation with respect to the face.  In other words, if before zoom
			// the media appears "upside down" from the camera, after zooming it will
			// still be upside down, but at least it will not flip.
            LLVector3d cur_camera_pos = LLVector3d(gAgentCamera.getCameraPositionGlobal());
            LLVector3d delta = (cur_camera_pos - camera_pos);
            F64 len = delta.length();
            delta.normalize();
            // Move 1% of the distance towards original camera location
            camera_pos += 0.01 * len * delta;
        }

		// If we are not allowing zooming out and the old camera position is closer to 
		// the center then the new intended camera position, don't move camera and return
		if (zoom_in_only &&
		    (dist_vec_squared(gAgentCamera.getCameraPositionGlobal(), target_pos) < dist_vec_squared(camera_pos, target_pos)))
		{
			return;
		}

		gAgentCamera.setCameraPosAndFocusGlobal(camera_pos, target_pos, object->getID() );

	}
	else
	{
		// If we have no object, focus back on the avatar.
		gAgentCamera.setFocusOnAvatar(TRUE, ANIMATE);
	}
}

//.........这里部分代码省略.........
			return TRUE;
		case CLICK_ACTION_OPEN:
			if (parent && parent->allowOpen())
			{
				mClickActionObject = parent;
				mLeftClickSelection = LLToolSelect::handleObjectSelection(mPick, FALSE, TRUE, TRUE);
				if (LLSelectMgr::getInstance()->selectGetAllValid())
				{
					// call this right away, since we have all the info we need to continue the action
					selectionPropertiesReceived();
				}
			}
			return TRUE;	
		case CLICK_ACTION_PLAY:
			handle_click_action_play();
			return TRUE;
		case CLICK_ACTION_OPEN_MEDIA:
			// mClickActionObject = object;
			handle_click_action_open_media(object);
			return TRUE;
		case CLICK_ACTION_ZOOM:
			{	
				const F32 PADDING_FACTOR = 2.f;
				LLViewerObject* object = gObjectList.findObject(mPick.mObjectID);
				
				if (object)
				{
					gAgentCamera.setFocusOnAvatar(FALSE, ANIMATE);
					
					LLBBox bbox = object->getBoundingBoxAgent() ;
					F32 angle_of_view = llmax(0.1f, LLViewerCamera::getInstance()->getAspect() > 1.f ? LLViewerCamera::getInstance()->getView() * LLViewerCamera::getInstance()->getAspect() : LLViewerCamera::getInstance()->getView());
					F32 distance = bbox.getExtentLocal().magVec() * PADDING_FACTOR / atan(angle_of_view);
				
					LLVector3 obj_to_cam = LLViewerCamera::getInstance()->getOrigin() - bbox.getCenterAgent();
					obj_to_cam.normVec();
					
					LLVector3d object_center_global = gAgent.getPosGlobalFromAgent(bbox.getCenterAgent());
					gAgentCamera.setCameraPosAndFocusGlobal(object_center_global + LLVector3d(obj_to_cam * distance), 
													  object_center_global, 
													  mPick.mObjectID );
				}
			}
			return TRUE;			
		default:
			// nothing
			break;
		}
	}

	// put focus back "in world"
	gFocusMgr.setKeyboardFocus(NULL);

	BOOL touchable = (object && object->flagHandleTouch()) 
					 || (parent && parent->flagHandleTouch());

	// Switch to grab tool if physical or triggerable
	if (object && 
		!object->isAvatar() && 
		((object->usePhysics() || (parent && !parent->isAvatar() && parent->usePhysics())) || touchable) 
		)
	{
		gGrabTransientTool = this;
		LLToolMgr::getInstance()->getCurrentToolset()->selectTool( LLToolGrab::getInstance() );
		return LLToolGrab::getInstance()->handleObjectHit( mPick );
	}