AntTweakBar with OpenGL
本文共 12219 字，大约阅读时间需要 40 分钟。
1,下载AntTweakbar,http://sourceforge.net/projects/anttweakbar/files/latest/download?source=dlp
2,用VS2010新建控制台工程，这里我们命名为FirstSample_withGLUT，新建main.cpp。
3,将antTweakBar/src/TwEventGLUT.c拷贝到main.cpp里面，略有改动，
内容如下：
// ---------------------------------------------------------------------------//// @file TwSimpleGLUT.c// @brief A simple example that uses AntTweakBar with OpenGL and GLUT.//// AntTweakBar: http://anttweakbar.sourceforge.net/doc// OpenGL: http://www.opengl.org// GLUT: http://opengl.org/resources/libraries/glut// // @author Philippe Decaudin// @date 2006/05/20//// ---------------------------------------------------------------------------#include "AntTweakBar.h"#include4，将glut32.lib glut32.dll opengl.lib opengldll glu.lib glu.dll拷贝到main.cpp所有在文件夹下，并在项目属性页的输入－附加依赖项加入这些库，如下图：#include #include #if defined(_WIN32) || defined(_WIN64)// MiniGLUT.h is provided to avoid the need of having GLUT installed to // recompile this example. Do not use it in your own programs, better// install and use the actual GLUT library SDK.# define USE_MINI_GLUT#endif#if defined(USE_MINI_GLUT)# include "MiniGLUT.h"#elif defined(_MACOSX)# include #else# include #endif// This example displays one of the following shapestypedef enum { SHAPE_TEAPOT=1, SHAPE_TORUS, SHAPE_CONE } Shape;#define NUM_SHAPES 3Shape g_CurrentShape = SHAPE_TORUS;// Shapes scalefloat g_Zoom = 1.0f;// Shape orientation (stored as a quaternion)float g_Rotation[] = { 0.0f, 0.0f, 0.0f, 1.0f };// Auto rotateint g_AutoRotate = 0;int g_RotateTime = 0;float g_RotateStart[] = { 0.0f, 0.0f, 0.0f, 1.0f };// Shapes materialfloat g_MatAmbient[] = { 0.5f, 0.0f, 0.0f, 1.0f };float g_MatDiffuse[] = { 1.0f, 1.0f, 0.0f, 1.0f };// Light parameterfloat g_LightMultiplier = 1.0f;float g_LightDirection[] = { -0.57735f, -0.57735f, -0.57735f };// Routine to set a quaternion from a rotation axis and angle// ( input axis = float[3] angle = float output: quat = float[4] )void SetQuaternionFromAxisAngle(const float *axis, float angle, float *quat){ float sina2, norm; sina2 = (float)sin(0.5f * angle); norm = (float)sqrt(axis[0]*axis[0] + axis[1]*axis[1] + axis[2]*axis[2]); quat[0] = sina2 * axis[0] / norm; quat[1] = sina2 * axis[1] / norm; quat[2] = sina2 * axis[2] / norm; quat[3] = (float)cos(0.5f * angle);}// Routine to convert a quaternion to a 4x4 matrix// ( input: quat = float[4] output: mat = float[4*4] )void ConvertQuaternionToMatrix(const float *quat, float *mat){ float yy2 = 2.0f * quat[1] * quat[1]; float xy2 = 2.0f * quat[0] * quat[1]; float xz2 = 2.0f * quat[0] * quat[2]; float yz2 = 2.0f * quat[1] * quat[2]; float zz2 = 2.0f * quat[2] * quat[2]; float wz2 = 2.0f * quat[3] * quat[2]; float wy2 = 2.0f * quat[3] * quat[1]; float wx2 = 2.0f * quat[3] * quat[0]; float xx2 = 2.0f * quat[0] * quat[0]; mat[0*4+0] = - yy2 - zz2 + 1.0f; mat[0*4+1] = xy2 + wz2; mat[0*4+2] = xz2 - wy2; mat[0*4+3] = 0; mat[1*4+0] = xy2 - wz2; mat[1*4+1] = - xx2 - zz2 + 1.0f; mat[1*4+2] = yz2 + wx2; mat[1*4+3] = 0; mat[2*4+0] = xz2 + wy2; mat[2*4+1] = yz2 - wx2; mat[2*4+2] = - xx2 - yy2 + 1.0f; mat[2*4+3] = 0; mat[3*4+0] = mat[3*4+1] = mat[3*4+2] = 0; mat[3*4+3] = 1;}// Routine to multiply 2 quaternions (ie, compose rotations)// ( input q1 = float[4] q2 = float[4] output: qout = float[4] )void MultiplyQuaternions(const float *q1, const float *q2, float *qout){ float qr[4]; qr[0] = q1[3]*q2[0] + q1[0]*q2[3] + q1[1]*q2[2] - q1[2]*q2[1]; qr[1] = q1[3]*q2[1] + q1[1]*q2[3] + q1[2]*q2[0] - q1[0]*q2[2]; qr[2] = q1[3]*q2[2] + q1[2]*q2[3] + q1[0]*q2[1] - q1[1]*q2[0]; qr[3] = q1[3]*q2[3] - (q1[0]*q2[0] + q1[1]*q2[1] + q1[2]*q2[2]); qout[0] = qr[0]; qout[1] = qr[1]; qout[2] = qr[2]; qout[3] = qr[3];}// Return elapsed time in millisecondsint GetTimeMs(){#if !defined(_WIN32) return glutGet(GLUT_ELAPSED_TIME);#else // glutGet(GLUT_ELAPSED_TIME) seems buggy on Windows return (int)GetTickCount(); #endif}// Callback function called by GLUT to render screenvoid Display(void){ float v[4]; // will be used to set light parameters float mat[4*4]; // rotation matrix // Clear frame buffer glClearColor(0, 0, 0, 1); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glEnable(GL_DEPTH_TEST); glDisable(GL_CULL_FACE); glEnable(GL_NORMALIZE); // Set light glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); v[0] = v[1] = v[2] = g_LightMultiplier*0.4f; v[3] = 1.0f; glLightfv(GL_LIGHT0, GL_AMBIENT, v); v[0] = v[1] = v[2] = g_LightMultiplier*0.8f; v[3] = 1.0f; glLightfv(GL_LIGHT0, GL_DIFFUSE, v); v[0] = -g_LightDirection[0]; v[1] = -g_LightDirection[1]; v[2] = -g_LightDirection[2]; v[3] = 0.0f; glLightfv(GL_LIGHT0, GL_POSITION, v); // Set material glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, g_MatAmbient); glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, g_MatDiffuse); // Rotate and draw shape glPushMatrix(); glTranslatef(0.5f, -0.3f, 0.0f); if( g_AutoRotate ) { float axis[3] = { 0, 1, 0 }; float angle = (float)(GetTimeMs()-g_RotateTime)/1000.0f; float quat[4]; SetQuaternionFromAxisAngle(axis, angle, quat); MultiplyQuaternions(g_RotateStart, quat, g_Rotation); } ConvertQuaternionToMatrix(g_Rotation, mat); glMultMatrixf(mat); glScalef(g_Zoom, g_Zoom, g_Zoom); glCallList(g_CurrentShape); glPopMatrix(); // Draw tweak bars TwDraw(); // Present frame buffer glutSwapBuffers(); // Recall Display at next frame glutPostRedisplay();}// Callback function called by GLUT when window size changesvoid Reshape(int width, int height){ // Set OpenGL viewport and camera glViewport(0, 0, width, height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(40, (double)width/height, 1, 10); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0,0,5, 0,0,0, 0,1,0); glTranslatef(0, 0.6f, -1); // Send the new window size to AntTweakBar TwWindowSize(width, height);}// Function called at exitvoid Terminate(void){ glDeleteLists(SHAPE_TEAPOT, NUM_SHAPES); TwTerminate();}// Callback function called when the 'AutoRotate' variable value of the tweak bar has changedvoid TW_CALL SetAutoRotateCB(const void *value, void *clientData){ (void)clientData; // unused g_AutoRotate = *(const int *)value; // copy value to g_AutoRotate if( g_AutoRotate!=0 ) { // init rotation g_RotateTime = GetTimeMs(); g_RotateStart[0] = g_Rotation[0]; g_RotateStart[1] = g_Rotation[1]; g_RotateStart[2] = g_Rotation[2]; g_RotateStart[3] = g_Rotation[3]; // make Rotation variable read-only TwDefine(" TweakBar/ObjRotation readonly "); } else // make Rotation variable read-write TwDefine(" TweakBar/ObjRotation readwrite ");}// Callback function called by the tweak bar to get the 'AutoRotate' valuevoid TW_CALL GetAutoRotateCB(void *value, void *clientData){ (void)clientData; // unused *(int *)value = g_AutoRotate; // copy g_AutoRotate to value} // Mainint main(int argc, char *argv[]){ TwBar *bar; // Pointer to the tweak bar float axis[] = { 0.7f, 0.7f, 0.0f }; // initial model rotation float angle = 0.8f; // Initialize GLUT glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); glutInitWindowSize(640, 480); glutCreateWindow("AntTweakBar simple example using GLUT"); glutCreateMenu(NULL); // Set GLUT callbacks glutDisplayFunc(Display); glutReshapeFunc(Reshape); atexit(Terminate); // Called after glutMainLoop ends // Initialize AntTweakBar TwInit(TW_OPENGL, NULL); // Set GLUT event callbacks // - Directly redirect GLUT mouse button events to AntTweakBar glutMouseFunc((GLUTmousebuttonfun)TwEventMouseButtonGLUT); // - Directly redirect GLUT mouse motion events to AntTweakBar glutMotionFunc((GLUTmousemotionfun)TwEventMouseMotionGLUT); // - Directly redirect GLUT mouse "passive" motion events to AntTweakBar (same as MouseMotion) glutPassiveMotionFunc((GLUTmousemotionfun)TwEventMouseMotionGLUT); // - Directly redirect GLUT key events to AntTweakBar glutKeyboardFunc((GLUTkeyboardfun)TwEventKeyboardGLUT); // - Directly redirect GLUT special key events to AntTweakBar glutSpecialFunc((GLUTspecialfun)TwEventSpecialGLUT); // - Send 'glutGetModifers' function pointer to AntTweakBar; // required because the GLUT key event functions do not report key modifiers states. TwGLUTModifiersFunc(glutGetModifiers); // Create some 3D objects (stored in display lists) glNewList(SHAPE_TEAPOT, GL_COMPILE); glutSolidTeapot(1.0); glEndList(); glNewList(SHAPE_TORUS, GL_COMPILE); glutSolidTorus(0.3, 1.0, 16, 32); glEndList(); glNewList(SHAPE_CONE, GL_COMPILE); glutSolidCone(1.0, 1.5, 64, 4); glEndList(); // Create a tweak bar bar = TwNewBar("TweakBar"); TwDefine(" GLOBAL help='This example shows how to integrate AntTweakBar with GLUT and OpenGL.' "); // Message added to the help bar. TwDefine(" TweakBar size='200 400' color='96 216 224' "); // change default tweak bar size and color // Add 'g_Zoom' to 'bar': this is a modifable (RW) variable of type TW_TYPE_FLOAT. Its key shortcuts are [z] and [Z]. TwAddVarRW(bar, "Zoom", TW_TYPE_FLOAT, &g_Zoom, " min=0.01 max=2.5 step=0.01 keyIncr=z keyDecr=Z help='Scale the object (1=original size).' "); // Add 'g_Rotation' to 'bar': this is a variable of type TW_TYPE_QUAT4F which defines the object's orientation TwAddVarRW(bar, "ObjRotation", TW_TYPE_QUAT4F, &g_Rotation, " label='Object rotation' opened=true help='Change the object orientation.' "); // Add callback to toggle auto-rotate mode (callback functions are defined above). TwAddVarCB(bar, "AutoRotate", TW_TYPE_BOOL32, SetAutoRotateCB, GetAutoRotateCB, NULL, " label='Auto-rotate' key=space help='Toggle auto-rotate mode.' "); // Add 'g_LightMultiplier' to 'bar': this is a variable of type TW_TYPE_FLOAT. Its key shortcuts are [+] and [-]. TwAddVarRW(bar, "Multiplier", TW_TYPE_FLOAT, &g_LightMultiplier, " label='Light booster' min=0.1 max=4 step=0.02 keyIncr='+' keyDecr='-' help='Increase/decrease the light power.' "); // Add 'g_LightDirection' to 'bar': this is a variable of type TW_TYPE_DIR3F which defines the light direction TwAddVarRW(bar, "LightDir", TW_TYPE_DIR3F, &g_LightDirection, " label='Light direction' opened=true help='Change the light direction.' "); // Add 'g_MatAmbient' to 'bar': this is a variable of type TW_TYPE_COLOR3F (3 floats color, alpha is ignored) // and is inserted into a group named 'Material'. TwAddVarRW(bar, "Ambient", TW_TYPE_COLOR3F, &g_MatAmbient, " group='Material' "); // Add 'g_MatDiffuse' to 'bar': this is a variable of type TW_TYPE_COLOR3F (3 floats color, alpha is ignored) // and is inserted into group 'Material'. TwAddVarRW(bar, "Diffuse", TW_TYPE_COLOR3F, &g_MatDiffuse, " group='Material' "); // Add the enum variable 'g_CurrentShape' to 'bar' // (before adding an enum variable, its enum type must be declared to AntTweakBar as follow) { // ShapeEV associates Shape enum values with labels that will be displayed instead of enum values TwEnumVal shapeEV[NUM_SHAPES] = { {SHAPE_TEAPOT, "Teapot"}, {SHAPE_TORUS, "Torus"}, {SHAPE_CONE, "Cone"} }; // Create a type for the enum shapeEV TwType shapeType = TwDefineEnum("ShapeType", shapeEV, NUM_SHAPES); // add 'g_CurrentShape' to 'bar': this is a variable of type ShapeType. Its key shortcuts are [<] and [>]. TwAddVarRW(bar, "Shape", shapeType, &g_CurrentShape, " keyIncr='<' keyDecr='>' help='Change object shape.' "); } // Store time g_RotateTime = GetTimeMs(); // Init rotation SetQuaternionFromAxisAngle(axis, angle, g_Rotation); SetQuaternionFromAxisAngle(axis, angle, g_RotateStart); // Call the GLUT main loop glutMainLoop(); return 0;}
5.运行，结果如下：
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