OPENGL学习 3D小雪人

#include <math.h> #include <GL/glut.h> #include <stdlib.h> static float angle=0.0,ratio; static float x=0.0f,y=1.75f,z=5.0f; //照相机所在位置 static float lx=0.0f,ly=0.0f,lz=-1.0f; //观察方向 static GLint snowman_display_list; void DrawSnowman() { glColor3f(1.0,1.0,1.0); //画身体 glTranslatef(0.0f,0.75f,0.0f); //坐标转换，用当前矩阵乘以参数指定的平移矩阵 glutSolidSphere(0.75f,20,20); //绘制实心球体。 //0.75f,球体的半径; //20,球体围绕z轴(相对于经度线)分割的数目; //20,球体沿着z轴(相对于维度线)分割的数目 //glutWireSphere(GLdouble radius,GLint slices,GLint stacks)—绘制线框球体,参数意义同上。 //画脑袋 glTranslatef(0.0f,1.0f,0.0f); glutSolidSphere(0.25f,20,20); //画眼睛 glPushMatrix(); glColor3f(0.0f,0.0f,0.0f); glTranslatef(0.05f,0.1f,0.18f); glutSolidSphere(0.05f,10,10); glTranslatef(-0.1f,0.0f,0.0f); glutSolidSphere(0.05f,10,10); glPopMatrix(); //画鼻子 glColor3f(1.0f,0.5f,0.5f); glRotatef(0.0f,1.0f,0.0f,0.0f); glutSolidCone(0.08f,0.5f,10,2); //绘制实心圆锥体 //0.08f,圆锥体基底的半径; //0.5f,圆锥体的高度; //10,圆锥体围绕z轴的分割数; //2,圆锥体沿着z轴的分割数 //glutSolidTorus(GLdouble innerradius,GLdouble outerradius,GLint nslices,GLint nstacks)绘制实心圆环 //innerradius,圆环内半径; //outerradius,圆环外半径; //nslices,沿着圆环方向的分割数; //nstacks,圆环的换线数 } GLuint CreateDL() { GLuint SnowmanDL; SnowmanDL=glGenLists(1); // 开始显示列表 glNewList(SnowmanDL,GL_COMPILE); // call the function that contains the rendering commands DrawSnowman(); // endList glEndList(); return SnowmanDL; } void initScene() { glEnable(GL_DEPTH_TEST); snowman_display_list =CreateDL(); } void Resize(int w,int h) { if(h==0)h=1; ratio=1.0*w/h; glMatrixMode(GL_PROJECTION); //指定哪一个矩阵式当前操作的矩阵。 //可选择的数值为： //GL_PROJECTION,对投影矩阵堆栈应用随后的矩阵操作 //GL_MODELVIEW,对模型视图矩阵堆栈应用随后的矩阵操作 //GL_TEXTRUE,对纹理矩阵堆栈应用随后的矩阵操作 glLoadIdentity(); //将当前矩阵设置为单位矩阵 glViewport(0,0,w,h); gluPerspective(45,ratio,1,1000);//创建透视投影矩阵函数。 //45是y方向上可见区域的夹角(视场角)，单位度； //ratio纵横比，确定x方向的可见区域； //(1,1000)从观察者到近修建平面和远修建平面的距离。 glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(x,y,z,x+lx,y+ly,z+lz,0.0,1.0,0.0);//定义视景转换函数。 //(x,y,z)视点的位置; //(lx,ly,lz)参考点的位置; //(0.0,1.0,0.0)向上矢量的方向 } void renderScene(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //画一个地面 glColor3f(0.9f, 0.9f, 0.9f); glBegin(GL_QUADS); glVertex3f(-100.0f, 0.0f, -100.0f); glVertex3f(-100.0f, 0.0f, 100.0f); glVertex3f( 100.0f, 0.0f, 100.0f); glVertex3f( 100.0f, 0.0f, -100.0f); glEnd(); //画36个雪人 for(int i = -3; i < 3; i++) for(int j=-3; j < 3; j++) { glPushMatrix(); glTranslatef(i*10.0,0,j * 10.0); glCallList(snowman_display_list);; glPopMatrix(); } glutSwapBuffers(); } void orientMe(float ang) { lx = sin(ang); lz = -cos(ang); glLoadIdentity(); gluLookAt(x, y, z, x + lx,y + ly,z + lz,0.0f,1.0f,0.0f); } void moveMeFlat(int direction) { x = x + direction*(lx)*0.1; z = z + direction*(lz)*0.1; glLoadIdentity(); gluLookAt(x, y, z, x + lx,y + ly,z + lz,0.0f,1.0f,0.0f); } void inputKey(int key, int x, int y) { switch (key) { case GLUT_KEY_LEFT : angle -= 0.01f; orientMe(angle);break; case GLUT_KEY_RIGHT : angle +=0.01f; orientMe(angle);break; case GLUT_KEY_UP : moveMeFlat(1);break; case GLUT_KEY_DOWN : moveMeFlat(-1);break; } } void main(int argc,char** argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA); glutInitWindowPosition(100,100); glutInitWindowSize(640,360); glutCreateWindow("SnowMen from 3D-Tech"); initScene(); glutSpecialFunc(inputKey); //鼠标回调函数 glutDisplayFunc(renderScene); glutIdleFunc(renderScene); //空闲任务函数 glutReshapeFunc(Resize); glutMainLoop(); }