opengl圆环的绘制
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#include "stdafx.h"
#include <GL/glut.h>
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#define PI_ 3.14159265358979323846
GLuint theTorus;
/* Draw a torus */
static void torus(int numc, int numt)
{
int i, j, k;
double s, t, x, y, z, twopi;
twopi = 2 * PI_;
for (i = 0; i < numc; i++) {
glBegin(GL_QUAD_STRIP);
for (j = 0; j <= numt; j++) {
for (k = 1; k >= 0; k--) {
s = (i + k) % numc + 0.5;
t = j % numt;
x = (1+.1*cos(s*twopi/numc))*cos(t*twopi/numt);
y = (1+.1*cos(s*twopi/numc))*sin(t*twopi/numt);//圆环的公式
z = .1 * sin(s * twopi / numc);
glVertex3f(x, y, z);
}
}
glEnd();
}
}
/* Create display list with Torus and initialize state */
static void init(void)
{
theTorus = glGenLists (1); //建立显示列表空间
glNewList(theTorus, GL_COMPILE); //创建一个显示列表
torus(8, 25);
glEndList(); //现实列表完成
glShadeModel(GL_FLAT); //设置着色模式,GL_FLAT表示采用恒定着色,使用图元中某个顶点的颜色来渲染整个图元。
glClearColor(0.0, 0.0, 0.0, 0.0);
}
/* Clear window and draw torus */
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f (1.0, 0.0, 0.0);
glCallList(theTorus); //执行显示列表
glFlush();
}
/* Handle window resize */
void reshape(int w, int h)
{
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(30, (GLfloat) w/(GLfloat) h, 1.0, 100.0); //透视投影
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
}
/* Rotate about x-axis when "yx" typed; rotate about y-axis
when "y" typed; "i" returns torus to original view */
void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case 'x':
case 'X':
glRotatef(30.,1.0,0.0,0.0);
glutPostRedisplay(); //重绘窗口
break;
case 'y':
case 'Y':
glRotatef(30.,0.0,1.0,0.0);
glutPostRedisplay();
break;
case 'i':
case 'I':
glLoadIdentity();
gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
glutPostRedisplay();
break;
case 27:
exit(0);
break;
}
}
int main(int argc, char **argv)
{
glutInitWindowSize(200, 200);
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutCreateWindow("yuanhuan");
init();
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
return 0;
#include <GL/glut.h>
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#define PI_ 3.14159265358979323846
GLuint theTorus;
/* Draw a torus */
static void torus(int numc, int numt)
{
int i, j, k;
double s, t, x, y, z, twopi;
twopi = 2 * PI_;
for (i = 0; i < numc; i++) {
glBegin(GL_QUAD_STRIP);
for (j = 0; j <= numt; j++) {
for (k = 1; k >= 0; k--) {
s = (i + k) % numc + 0.5;
t = j % numt;
x = (1+.1*cos(s*twopi/numc))*cos(t*twopi/numt);
y = (1+.1*cos(s*twopi/numc))*sin(t*twopi/numt);//圆环的公式
z = .1 * sin(s * twopi / numc);
glVertex3f(x, y, z);
}
}
glEnd();
}
}
/* Create display list with Torus and initialize state */
static void init(void)
{
theTorus = glGenLists (1); //建立显示列表空间
glNewList(theTorus, GL_COMPILE); //创建一个显示列表
torus(8, 25);
glEndList(); //现实列表完成
glShadeModel(GL_FLAT); //设置着色模式,GL_FLAT表示采用恒定着色,使用图元中某个顶点的颜色来渲染整个图元。
glClearColor(0.0, 0.0, 0.0, 0.0);
}
/* Clear window and draw torus */
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f (1.0, 0.0, 0.0);
glCallList(theTorus); //执行显示列表
glFlush();
}
/* Handle window resize */
void reshape(int w, int h)
{
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(30, (GLfloat) w/(GLfloat) h, 1.0, 100.0); //透视投影
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
}
/* Rotate about x-axis when "yx" typed; rotate about y-axis
when "y" typed; "i" returns torus to original view */
void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case 'x':
case 'X':
glRotatef(30.,1.0,0.0,0.0);
glutPostRedisplay(); //重绘窗口
break;
case 'y':
case 'Y':
glRotatef(30.,0.0,1.0,0.0);
glutPostRedisplay();
break;
case 'i':
case 'I':
glLoadIdentity();
gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
glutPostRedisplay();
break;
case 27:
exit(0);
break;
}
}
int main(int argc, char **argv)
{
glutInitWindowSize(200, 200);
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutCreateWindow("yuanhuan");
init();
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
return 0;
}
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