第八周課堂作業

旋轉中的地球:
#include <GL/glut.h>
#include <opencv/highgui.h>
#include <opencv/cv.h>
GLUquadric * quad=NULL; //宣告二次曲面
float angle=0; //宣告angle值
void display()
{
glEnable(GL_DEPTH_TEST);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glPushMatrix();
glRotatef(90,1,0,0); //轉向

glRotatef(angle,0,0,1); //旋轉中的地球
gluQuadricTexture(quad,true); //二次曲面貼圖設定 打開
gluSphere(quad,0.8,30,30); //使用 glu 來畫圓球(圓球是二次曲面)
glPopMatrix();
glutSwapBuffers();
}
void idle()
{
angle++;  //連續轉動 每次改變angle值
glutPostRedisplay(); //重新播放畫面
}
int main()
{
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week08");
glutDisplayFunc(display);
glutIdleFunc(idle);

GLuint id;
IplImage * img = cvLoadImage("earth.jpg");
cvCvtColor(img, img, CV_BGR2RGB);
glEnable(GL_TEXTURE_2D);
glGenTextures(1,&id);
glBindTexture(GL_TEXTURE_2D,id);

glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D,0,GL_RGB,img->width,img->height,0,GL_RGB,GL_UNSIGNED_BYTE,img->imageData);

quad = gluNewQuadric();
glutMainLoop();
}