opengl opengl初学者 地球-可旋转鼠标按键缩放

#include "MyTexMgr.h" #include <iostream> #include <stdlib.h> #include <vector> #include "MyTexMgr.h" #ifdef __APPLE__ #include <OpenGL/OpenGL.h> #include <GLUT/glut.h> #else #include <GL/glut.h> #endif using namespace std; static float _angle = 30.0f; static float _cameraAngle = 0.0f; static int oldX; static int oldY; static float _rotX=0; static float _rotY=0; static float xyz[3]={1,1,1}; static float r=200; static GLUquadric* _earth; static MyTexMgr _texLoader; //按按键操作 void handleKeypress(unsigned char key, int x, int y) { switch (key) { case 27: //Escape key exit(0);break; //按上则放大 case 'w': xyz[0]+=0.1;xyz[1]+=0.1;xyz[2]+=0.1; //r+=10; glutPostRedisplay();break; //按下则缩小缩小到一定程度不让缩小 case 's': if(xyz[0]>0.5){ xyz[0]-=0.1;xyz[1]-=0.1;xyz[2]-=0.1; } //r-=10; glutPostRedisplay();break; } } //定义光照 void initLight() { GLfloat ambientLight[]={0.2,0.2,0.2,1}; GLfloat diffuseLight[]={0.8,.8,0.8,1}; GLfloat specularLight[]={0.5,0.5,0.5,1}; GLfloat posLight[]={400,240,1,1}; GLfloat specref[]={1,1,1,1}; glLightModelfv(GL_LIGHT_MODEL_AMBIENT,ambientLight); //glLightfv(GL_LIGHT0,GL_POSITION,posLight); //指定光源位置 glLightfv(GL_LIGHT0,GL_AMBIENT,ambientLight); glLightfv(GL_LIGHT0,GL_DIFFUSE,diffuseLight); glLightfv(GL_LIGHT0,GL_SPECULAR,specularLight); glMaterialf(GL_FRONT_AND_BACK,GL_SHININESS,128); } //定义D建模光照材质 void initRendering() { //创建二次曲面对象 _earth=gluNewQuadric(); //装载纹理 _texLoader.loadTex(L"earth",L"E:/pic/earth1.bmp"); initLight(); glEnable(GL_LIGHT0); glEnable(GL_LIGHTING); glEnable(GL_DEPTH_TEST); glEnable(GL_LINE_SMOOTH); //glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL,GL_SEPARATE_SPECULAR_COLOR);//镜面亮点 } //删除建模 void deinitRendering() { gluDeleteQuadric(_earth); } //窗口调整调用 void handleResize(int w, int h) { if (h==0) { h=1; } glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0,w,0,h,-200,200); glMatrixMode(GL_MODELVIEW); } //画地球 void drawEarth() { static bool loaded=false; //纹理绑定到目标 glBindTexture(GL_TEXTURE_2D,_texLoader.getTex(L"earth")); if (!loaded) { //纹理坐标自动生成 glTexGeni(GL_S,GL_TEXTURE_GEN_MODE,GL_SPHERE_MAP); glTexGeni(GL_T,GL_TEXTURE_GEN_MODE,GL_SPHERE_MAP); //表面生成纹理坐标 gluQuadricDrawStyle(_earth,GL_FILL); gluQuadricNormals(_earth,GLU_SMOOTH); gluQuadricTexture(_earth,GL_TRUE); } //生成球体 glPushMatrix(); { glEnable(GL_TEXTURE_2D); glRotatef(-90,1,0,0); gluSphere(_earth,r,100,100); glDisable(GL_TEXTURE_2D); } glPopMatrix(); } //绘制D场景 void drawScene() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); //切换到绘图透视图 glLoadIdentity(); //重置绘图透视图 glPushMatrix(); //实现缩放 glScalef(xyz[0],xyz[1],xyz[2]); //此处需要把地球往后方移动防止放大的时候中间出现黑色圆圈 glTranslatef(400,240,-200); //实现拖动旋转 glRotatef(_rotX/100,0,1,0); glRotatef(-_rotY/100,1,0,0); //实现自动旋转 glRotatef(_angle,0,1,0); drawEarth(); glPopMatrix(); glutSwapBuffers(); } //实现自动旋转效果 void update(int value) { _angle += 2.0f; if (_angle > 360) { _angle -= 360; } //重画 glutPostRedisplay(); //60FPS glutTimerFunc(16, update, 0); } //处理鼠标点击旋转事件 //处理鼠标点击滑动事件 void handleMotion(int x,int y) { int rx=x-oldX; int ry=480-y-oldY; _rotX+=rx; _rotY+=ry; //重画 glutPostRedisplay(); } //处理鼠标点击事件 void handleMouse(int button,int state,int x,int y) { static bool done=false; if (button==GLUT_LEFT_BUTTON) { oldX=x; oldY=480-y; } } int main(int argc, char** argv) { //初始化 glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH); glutInitWindowSize(800, 480); //创建窗口 glutCreateWindow("地球仪"); initRendering(); //设置用户操作 glutDisplayFunc(drawScene); glutKeyboardFunc(handleKeypress); glutReshapeFunc(handleResize); glutMotionFunc(handleMotion); glutMouseFunc(handleMouse); //运动效果 glutTimerFunc(16, update, 0); glutMainLoop(); //退出时删除建模 deinitRendering(); return 0; }