irrlicht实现沿平面移动物体
来源：互联网 发布：如何屏蔽公司网络监控 编辑：程序博客网 时间：2024/04/30 04:32
使用到的原理：射线与面相交性检测
源码引用地址：http://irrlicht.sourceforge.net/forum/viewtopic.php?f=1&t=33059&p=190974&hilit=drag+move+model#p190974
// IrrEditor.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include <irrlicht.h>using namespace irr;using namespace core;using namespace scene;using namespace video;using namespace io;using namespace gui;#pragma comment(lib, "Irrlicht.lib")IrrlichtDevice *device = 0;IVideoDriver *driver = 0;ISceneManager *smgr = 0;IGUIEnvironment *guienv = 0;ICameraSceneNode *camera = 0;ISceneCollisionManager *CollMan = 0;enum EditorMode{ MODE_NONE, MODE_QUIT, MODE_TRANSLATE, MODE_ROTATE, MODE_SCALE,};position2di initialCursorPosition; // where mouse cursor startedposition2di initialObjectPosition; // where ray from camera to object intersected screenISceneNode* SelectedNode = 0; // the selected nodebool ShiftIsPressed = 0; // is the shift key pressed?bool LMouseButtonDown = 0; // is the left mouse button down?EditorMode Mode = MODE_TRANSLATE;float RotateSpeed = 0.01f;float ScaleSpeed = 0.01f;#define ID_QUIT 101#define ID_TRANSLATE 102#define ID_ROTATE 103#define ID_SCALE 104class MyEventReceiver : public IEventReceiver{public: virtual bool OnEvent(const SEvent& anevent) { switch(anevent.EventType) { case EET_GUI_EVENT : { switch (anevent.GUIEvent.EventType) { case EGET_BUTTON_CLICKED: { switch (anevent.GUIEvent.Caller->getID()) { case ID_QUIT : { Mode = MODE_QUIT; } break; case ID_TRANSLATE : { Mode = MODE_TRANSLATE; } break; case ID_ROTATE : { Mode = MODE_ROTATE; } break; case ID_SCALE : { Mode = MODE_SCALE; } break; } break; } break; } } break; case EET_KEY_INPUT_EVENT : { if (anevent.KeyInput.Shift) ShiftIsPressed = true; else ShiftIsPressed = false; } break; // if it is a mouse event case EET_MOUSE_INPUT_EVENT : { // based upon the mouse event type switch (anevent.MouseInput.Event) { case EMIE_LMOUSE_PRESSED_DOWN : { // what a freakin hack LMouseButtonDown = true; // check for a node being selected SelectedNode = CollMan->getSceneNodeFromScreenCoordinatesBB(device->getCursorControl()->getPosition(),0,true); // If we selected a node if(SelectedNode) { // Remember where the node and cursor were when it was clicked on initialCursorPosition = device->getCursorControl()->getPosition(); initialObjectPosition = CollMan->getScreenCoordinatesFrom3DPosition(SelectedNode->getAbsolutePosition(), camera); } // we used this message? return (SelectedNode != 0); } break; case EMIE_LMOUSE_LEFT_UP : { LMouseButtonDown = false; return false; } break; case EMIE_MOUSE_MOVED : { if (!LMouseButtonDown) return false; if (Mode == MODE_TRANSLATE) { if (SelectedNode) { vector3df p = SelectedNode->getPosition(); if (ShiftIsPressed) { plane3df const planeXY(SelectedNode->getAbsolutePosition(), vector3df(1.f, 0.f, 0.f)); position2di currentCursorPosition(device->getCursorControl()->getPosition()); position2di effectiveObjectPosition = initialObjectPosition + currentCursorPosition - initialCursorPosition; line3df ray(CollMan->getRayFromScreenCoordinates(effectiveObjectPosition, camera)); vector3df intersectWithPlane; vector3df oldPos = SelectedNode->getAbsolutePosition(); if(planeXY.getIntersectionWithLine(ray.start, ray.getVector(), intersectWithPlane)) { intersectWithPlane.X = oldPos.X; intersectWithPlane.Z = oldPos.Z; SelectedNode->setPosition(intersectWithPlane); } } else { plane3df const planeXZ(SelectedNode->getAbsolutePosition(), vector3df(0.f, 1.f, 0.f)); position2di currentCursorPosition(device->getCursorControl()->getPosition()); position2di effectiveObjectPosition = initialObjectPosition + currentCursorPosition - initialCursorPosition; line3df ray(CollMan->getRayFromScreenCoordinates(effectiveObjectPosition, camera)); vector3df intersectWithPlane; if(planeXZ.getIntersectionWithLine(ray.start, ray.getVector(), intersectWithPlane)) { SelectedNode->setPosition(intersectWithPlane); } } } } // end mode translate else if (Mode == MODE_ROTATE) { if (SelectedNode) { vector3df rot = SelectedNode->getRotation(); position2di currentCursorPosition(device->getCursorControl()->getPosition()); if (ShiftIsPressed) { if (initialObjectPosition.X < currentCursorPosition.X) rot.X -= RotateSpeed; if (initialObjectPosition.X > currentCursorPosition.X) rot.X += RotateSpeed; } else { if (initialObjectPosition.X < currentCursorPosition.X) rot.Y -= RotateSpeed; if (initialObjectPosition.X > currentCursorPosition.X) rot.Y += RotateSpeed; if (initialObjectPosition.Y < currentCursorPosition.Y) rot.Z -= 1; if (initialObjectPosition.Y > currentCursorPosition.Y) rot.Z += 1; } initialObjectPosition = currentCursorPosition; SelectedNode->setRotation(rot); } } else if (Mode == MODE_SCALE) { if (SelectedNode) { vector3df scale = SelectedNode->getScale(); position2di currentCursorPosition(device->getCursorControl()->getPosition()); if (initialObjectPosition.X > currentCursorPosition.X) { scale.X -= ScaleSpeed; scale.Y -= ScaleSpeed; scale.Z -= ScaleSpeed; } if (initialObjectPosition.X < currentCursorPosition.X) { scale.X += ScaleSpeed; scale.Y += ScaleSpeed; scale.Z += ScaleSpeed; } initialObjectPosition = currentCursorPosition; SelectedNode->setScale(scale); } } } break; } } } return 0; }};int _tmain(int argc, _TCHAR* argv[]){ // create the device device = createDevice( video::EDT_OPENGL, dimension2d<s32>(640, 480), 16, false, false, false, 0); if (!device) return 1; MyEventReceiver receiver; device->setEventReceiver(&receiver); // get a pointer to all of the irr items driver = device->getVideoDriver(); smgr = device->getSceneManager(); guienv = device->getGUIEnvironment(); CollMan = smgr->getSceneCollisionManager(); // add my little plug int x = 10; int y = 10; int width = 100; int height = 20; int space = 5; guienv->addButton(core::rect<s32>(x,y,x+width,y+height),0,ID_QUIT,L"QUIT"); y += height + space; guienv->addButton(core::rect<s32>(x,y,x+width,y+height),0,ID_TRANSLATE,L"Translate"); y += height + space; guienv->addButton(core::rect<s32>(x,y,x+width,y+height),0,ID_ROTATE,L"Rotate"); y += height + space; guienv->addButton(core::rect<s32>(x,y,x+width,y+height),0,ID_SCALE,L"Scale"); // load a mesh IAnimatedMesh* mesh = smgr->getMesh("../media/sydney.md2"); if (!mesh) return 1; // create a node IAnimatedMeshSceneNode* node = smgr->addAnimatedMeshSceneNode( mesh ); if (node) { node->setMaterialFlag(EMF_LIGHTING, false); node->setMD2Animation(scene::EMAT_STAND); node->setMaterialTexture( 0, driver->getTexture("../media/sydney.bmp") ); } // add a camera camera = smgr->addCameraSceneNode(0, vector3df(0,30,-40), vector3df(0,5,0)); camera->setIsDebugObject(true); // run the scne while(Mode != MODE_QUIT) { device->run(); driver->beginScene(true, true, SColor(255,100,101,140)); smgr->drawAll(); guienv->drawAll(); driver->endScene(); } // kill the device device->drop(); return 0;} 0 0
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