OpenGL缩放变换

代码：

  1 #define GLUT_DISABLE_ATEXIT_HACK
  2 #include "gl/glut.h"
  3 
  4 int i;
  5 void OnMouse(GLint,GLint,GLint,GLint);
  6 void OnDisplay(void);
  7 void OnReShape(int,int);
  8 void SetupLights();
  9 
 10 void main(int argc,char* argv[])
 11 {
 12     glutInit(&argc,argv);
 13     glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
 14     glutInitWindowSize(600,480);
 15     glutCreateWindow("OpenGL缩放变换");
 16     
 17     glutReshapeFunc(OnReShape);
 18     glutDisplayFunc(OnDisplay);
 19     glutMouseFunc(OnMouse);
 20 
 21 
 22     
 23     SetupLights();
 24     
 25     glutMainLoop();
 26 }
 27 
 28 void OnDisplay(void)
 29 {
 30     GLfloat sizes[]={1.0f,1.0f,1.0f,2.0f,
 31                     1.0f,1.0f,1.0f,2.0f,
 32                     1.0f,1.0f,1.0f,2.0f,
 33                     2.0f,2.0f,1.0f,2.0f,
 34                     1.0f,2.0f,1.0f,2.0f,
 35                     2.0f,2.0f,2.0f,2.0f,
 36     };
 37     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 38     
 39     glEnable(GL_DEPTH_TEST);
 40     
 41     glMatrixMode(GL_MODELVIEW);
 42     glLoadIdentity();
 43 
 44     glRotatef(30.0f,1.0f,0.0f,0.0f);
 45     glRotatef(15.0f,0.0f,1.0f,0.0f);
 46     
 47 
 48     glColor3f(1.0f,1.0f,0.0f);
 49     glScalef(sizes[i*3],sizes[i*3+1],sizes[i*3+2]);
 50     glutSolidCube(50.f);
 51 
 52 
 53     glutSwapBuffers();
 54     
 55 }
 56 
 57 void OnReShape(int w,int h)
 58 {
 59     GLfloat aspect =(GLfloat)w/(GLfloat)h;
 60     GLfloat nRange=100.0f;
 61     
 62     glViewport(0,0,w,h);
 63     
 64     glMatrixMode(GL_PROJECTION);     //将当前矩阵指定为投影模式
 65     glLoadIdentity();
 66     
 67     //设置三维投影区
 68     
 69     if (w<=h)
 70     {
 71         glOrtho(-nRange,nRange,-nRange*aspect,nRange*aspect,-nRange,nRange);
 72     } 
 73     else
 74     {
 75         glOrtho(-nRange,nRange,-nRange/aspect,nRange/aspect,-nRange,nRange);
 76     }
 77     
 78 }
 79 
 80 void OnMouse(GLint button, GLint State, GLint x, GLint y)
 81 {
 82     if(button==GLUT_LEFT_BUTTON && State==GLUT_UP) //鼠标左键释放
 83         i++;
 84     if(i==8)                                       //若i的值为8，则重回0
 85         i=0;
 86     glutPostRedisplay();
 87 }
 88 
 89 void SetupLights()
 90 {
 91     GLfloat ambientLight[]={0.2f,0.2f,0.2f,1.0f};//环境光
 92     GLfloat diffuseLight[]={0.9f,0.9f,0.9f,1.0f};//漫反射
 93     GLfloat specularLight[]={1.0f,1.0f,1.0f,1.0f};//镜面光
 94     GLfloat lightPos[]={50.0f,80.0f,60.0f,1.0f};//光源位置
 95     
 96     glEnable(GL_LIGHTING);                      //启用光照
 97     glLightfv(GL_LIGHT0,GL_AMBIENT,ambientLight);//设置环境光源
 98     glLightfv(GL_LIGHT0,GL_DIFFUSE,diffuseLight);//设置漫反射光源
 99     glLightfv(GL_LIGHT0,GL_SPECULAR,specularLight);//设置镜面光源
100     glLightfv(GL_LIGHT0,GL_POSITION,lightPos);//设置灯光位置
101     glEnable(GL_LIGHT0);                              //打开第一个灯光
102     
103     glEnable(GL_COLOR_MATERIAL);                      //启用材质的颜色跟踪
104     glColorMaterial(GL_FRONT,GL_AMBIENT_AND_DIFFUSE); //指定材料着色的面
105     glMaterialfv(GL_FRONT,GL_SPECULAR,specularLight); //指定材料对镜面光的反应
106     glMateriali(GL_FRONT,GL_SHININESS,100);           //指定反射系数
107     
108     
109  }



 posted on 2012-04-06 17:01  xiacl  阅读(491)  评论(0)    收藏  举报