基于opengl的3d魔方（irrlicht）

// Copyright (C) 2002-2010 Nikolaus Gebhardt // This file is part of the "Irrlicht Engine". // For conditions of distribution and use, see copyright notice in irrlicht.h #include "cameraControler.h" #include "IVideoDriver.h" #include "ISceneManager.h" #include "Keycodes.h" #include "ICursorControl.h" #include "ISceneNodeAnimatorCollisionResponse.h" #include "ISceneCollisionManager.h" namespace irr { namespace scene { //! constructor CameraControler::CameraControler(gui::ICursorControl* cursorControl, ISceneManager * smgr, f32 rotateSpeed, bool invertY) : CursorControl(cursorControl), MaxVerticalAngle(88.0f), manager(smgr), RotateSpeed(rotateSpeed),MouseYDirection(invertY ? -1.0f : 1.0f),camera(0), LastAnimationTime(0), firstUpdate(true), hasPressedDown(false), directionPrepared(false), useLeftMouse(false) { #ifdef _DEBUG setDebugName("CameraControler"); #endif if (CursorControl) CursorControl->grab(); } //! destructor CameraControler::~CameraControler() { if (CursorControl) CursorControl->drop(); } //! It is possible to send mouse and key events to the camera. Most cameras //! may ignore this input, but camera scene nodes which are created for //! example with scene::ISceneManager::addMayaCameraSceneNode or //! scene::ISceneManager::addFPSCameraSceneNode, may want to get this input //! for changing their position, look at target or whatever. bool CameraControler::OnEvent(const SEvent& evt) { if(evt.EventType == EET_MOUSE_INPUT_EVENT) { if (evt.MouseInput.Event == EMIE_RMOUSE_PRESSED_DOWN) { now = then = CursorControl->getPosition(); video::IVideoDriver* driver = manager->getVideoDriver(); core::rect<s32> screenRect(0, 0, driver->getScreenSize().Width, driver->getScreenSize().Height); hasPressedDown = screenRect.isPointInside(then); directionPrepared = false; return true; } if (evt.MouseInput.Event == EMIE_MOUSE_MOVED) { if (hasPressedDown) { then = now; now = CursorControl->getPosition(); video::IVideoDriver* driver = manager->getVideoDriver(); core::rect<s32> screenRect(0, 0, driver->getScreenSize().Width, driver->getScreenSize().Height); directionPrepared = screenRect.isPointInside(now); if (useLeftMouse) { // 是否选中魔方 ISceneCollisionManager* collMan = manager->getSceneCollisionManager(); core::line3df ray = collMan->getRayFromScreenCoordinates(now, camera); scene::ISceneNode * selectedSceneNode = collMan->getSceneNodeFromRayBB(ray); int id = -1; if (selectedSceneNode) id = selectedSceneNode->getID(); if (id != -1) useLeftMouse = directionPrepared = hasPressedDown = false; } } return true; } if (evt.MouseInput.Event == EMIE_RMOUSE_LEFT_UP) { directionPrepared = hasPressedDown = false; return true; } if (evt.MouseInput.Event == EMIE_LMOUSE_PRESSED_DOWN) { if (camera == NULL) return true; now = then = CursorControl->getPosition(); // 是否选中魔方 ISceneCollisionManager* collMan = manager->getSceneCollisionManager(); core::line3df ray = collMan->getRayFromScreenCoordinates(now, camera); scene::ISceneNode * selectedSceneNode = collMan->getSceneNodeFromRayBB(ray); int id = -1; if (selectedSceneNode) id = selectedSceneNode->getID(); // 是否在视口内 video::IVideoDriver* driver = manager->getVideoDriver(); core::rect<s32> screenRect(0, 0, driver->getScreenSize().Width, driver->getScreenSize().Height); useLeftMouse = hasPressedDown = screenRect.isPointInside(then) && id == -1; directionPrepared = false; return true; } if (evt.MouseInput.Event == EMIE_LMOUSE_LEFT_UP) { if (useLeftMouse) useLeftMouse = directionPrepared = hasPressedDown = false; return true; } if (evt.MouseInput.Event == EMIE_MOUSE_WHEEL) { if (evt.MouseInput.Wheel > 0) camera->setPosition(camera->getPosition() * 0.9); else camera->setPosition(camera->getPosition() * 1.1); return true; } } return false; } void CameraControler::animateNode(ISceneNode* node, u32 timeMs) { if (!node || node->getType() != ESNT_CAMERA) return; camera = static_cast<ICameraSceneNode*>(node); if (firstUpdate) { camera->updateAbsolutePosition(); firstUpdate = false; } // If the camera isn't the active camera, and receiving input, then don't process it. if(!camera->isInputReceiverEnabled()) return; if(manager && manager->getActiveCamera() != camera) return; if (CursorControl && directionPrepared) { core::position2d<s32> move = now - then; video::IVideoDriver* driver = manager->getVideoDriver(); core::vector3df rotate(0, 0, 0); if (3 * core::abs_(move.X) > core::abs_(move.Y)) { f32 angle = (move.X * RotateSpeed) / driver->getScreenSize().Width; rotate.Y = angle; } else { f32 angle = (move.Y * RotateSpeed) / driver->getScreenSize().Height; bool XisPositive = camera->getPosition().X > 0; bool ZisPositive = camera->getPosition().Z > 0; bool atLelf = now.X * 2 < driver->getScreenSize().Width; if ((XisPositive + ZisPositive + atLelf) % 2) rotate.Z = XisPositive ? 1 : -1; else rotate.X = ZisPositive ? -1 : 1; // 修正角度 core::vector3df target = (camera->getTarget() - camera->getAbsolutePosition()); core::vector3df relativeRotation = target.getHorizontalAngle(); f32 MaxVerticalAngle = 88; f32 deg = (rotate.X + rotate.Z) * (relativeRotation.dotProduct(rotate) + angle); if (deg> MaxVerticalAngle * 2 && deg < 360.0f-MaxVerticalAngle) deg = 360.0f-MaxVerticalAngle; else if (deg > MaxVerticalAngle && deg < 360.0f-MaxVerticalAngle) deg = MaxVerticalAngle; angle = deg * (rotate.X + rotate.Z) - relativeRotation.dotProduct(rotate); rotate *= angle; } camera->setPosition(rotate.rotationToDirection(camera->getPosition())); camera->setTarget(rotate.rotationToDirection(camera->getTarget())); } } //! Sets the rotation speed void CameraControler::setRotateSpeed(f32 speed) { RotateSpeed = speed; } //! Gets the rotation speed f32 CameraControler::getRotateSpeed() const { return RotateSpeed; } //! Sets whether the Y axis of the mouse should be inverted. void CameraControler::setInvertMouse(bool invert) { if (invert) MouseYDirection = -1.0f; else MouseYDirection = 1.0f; } ISceneNodeAnimator* CameraControler::createClone(ISceneNode* node, ISceneManager* newManager) { CameraControler * newAnimator = new CameraControler(CursorControl, manager, RotateSpeed, core::iszero(MouseYDirection + 1.0f)); return newAnimator; } } // namespace scene } // namespace irr