计算机图形学上机代码

1、E.g1第一个OpenGL程序#include <GL/glut.h>void myDisplay(void) glClear(GL_COLOR_BUFFER_BIT); glRectf(-0.5f, -0.5f, 0.5f, 0.5f); glFlush();int main(int argc, char *argv) glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); glutInitWindowPosition(100, 100); glutInitWindowSize(400, 40

2、0); glutCreateWindow("第一个OpenGL程序"); glutDisplayFunc(&myDisplay); glutMainLoop(); return 0;E.g.2画圆#include <math.h>const int n = 20;const GLfloat R = 0.5f;const GLfloat Pi = 3.1415926536f;void myDisplay(void) int i; glClear(GL_COLOR_BUFFER_BIT); glBegin(GL_POLYGON); for(i=0; i<

3、;n; +i) glVertex2f(R*cos(2*Pi/n*i), R*sin(2*Pi/n*i); glEnd(); glFlush();E.g.3正弦函数#include <math.h>const GLfloat factor = 0.1f;void myDisplay(void) GLfloat x; glClear(GL_COLOR_BUFFER_BIT); glBegin(GL_LINES); glVertex2f(-1.0f, 0.0f); glVertex2f(1.0f, 0.0f); / 以上两个点可以画x轴 glVertex2f(0.0f, -1.0f);

4、glVertex2f(0.0f, 1.0f); / 以上两个点可以画y轴 glEnd(); glBegin(GL_LINE_STRIP); for(x=-1.0f/factor; x<1.0f/factor; x+=0.01f) glVertex2f(x*factor, sin(x)*factor); glEnd(); glFlush();E.g.4五角星#include <GL/glut.h>#include <math.h>const GLfloat Pi = 3.1415926536f;void myDisplay(void) GLfloat a = 1 /

5、 (2-2*cos(72*Pi/180); GLfloat bx = a * cos(18 * Pi/180); GLfloat by = a * sin(18 * Pi/180); GLfloat cy = -a * cos(18 * Pi/180); GLfloat PointA2 = 0, a , PointB2 = bx, by , PointC2 = 0.5, cy , PointD2 = -0.5, cy , PointE2 = -bx, by ; glClear(GL_COLOR_BUFFER_BIT); / 按照A->C->E->B->D->A的顺

6、序，可以一笔将五角星画出 glBegin(GL_LINE_LOOP);glVertex2fv(PointA);glVertex2fv(PointC);glVertex2fv(PointE);glVertex2fv(PointB); glVertex2fv(PointD); glEnd(); glFlush();E.g.5线型#include <GL/glut.h>void myDisplay(void) glClear(GL_COLOR_BUFFER_BIT); glEnable(GL_LINE_STIPPLE); glLineStipple(2, 0x0F0F); glLineW

7、idth(10.0f); glBegin(GL_LINES); glVertex2f(0.0f, 0.0f); glVertex2f(0.5f, 0.5f); glEnd(); glFlush();E.g.6镂空多边形#include <GL/glut.h>#include <stdio.h>#include <stdlib.h>void myDisplay(void)/*static GLubyte Mask128 = 0x00, 0x00, 0x00, 0x00, / 这是最下面的一行 0x00, 0x00, 0x00, 0x00, 0x03, 0x80

8、, 0x01, 0xC0, / 麻 0x06, 0xC0, 0x03, 0x60, / 烦 0x04, 0x60, 0x06, 0x20, / 的 0x04, 0x30, 0x0C, 0x20, / 初 0x04, 0x18, 0x18, 0x20, / 始 0x04, 0x0C, 0x30, 0x20, / 化 0x04, 0x06, 0x60, 0x20, / ， 0x44, 0x03, 0xC0, 0x22, / 不 0x44, 0x01, 0x80, 0x22, / 建 0x44, 0x01, 0x80, 0x22, / 议 0x44, 0x01, 0x80, 0x22, / 使 0x

9、44, 0x01, 0x80, 0x22, / 用 0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22, 0x66, 0x01, 0x80, 0x66, 0x33, 0x01, 0x80, 0xCC, 0x19, 0x81, 0x81, 0x98, 0x0C, 0xC1, 0x83, 0x30, 0x07, 0xE1, 0x87, 0xE0, 0x03, 0x3F, 0xFC, 0xC0, 0x03, 0x31, 0x8C, 0xC0, 0x03, 0x3F, 0xFC, 0xC0, 0x06, 0x64, 0x26, 0x60, 0x0C, 0xCC

10、, 0x33, 0x30, 0x18, 0xCC, 0x33, 0x18, 0x10, 0xC4, 0x23, 0x08, 0x10, 0x63, 0xC6, 0x08, 0x10, 0x30, 0x0C, 0x08, 0x10, 0x18, 0x18, 0x08, 0x10, 0x00, 0x00, 0x08 / 这是最上面的一行;*/ static GLubyte Mask128; FILE *fp; fp = fopen("D:/Mask/Mask.bmp", "rb"); /注意此处的格式 fp = fopen("D:/vclx/mas

11、k.bmp", "rb"); if( !fp ) exit(0); if( fseek(fp, -(int)sizeof(Mask), SEEK_END) ) exit(0); if( !fread(Mask, sizeof(Mask), 1, fp) ) exit(0); fclose(fp); glClear(GL_COLOR_BUFFER_BIT); glEnable(GL_POLYGON_STIPPLE); glPolygonStipple(Mask); glRectf(-0.5f, -0.5f, 0.0f, 0.0f); / 在左下方绘制一个有镂空效果的

12、正方形 glDisable(GL_POLYGON_STIPPLE); glRectf(0.0f, 0.0f, 0.5f, 0.5f); / 在右上方绘制一个无镂空效果的正方形 glFlush();E.g.7着色模型#include <GL/glut.h>#include <math.h>const GLdouble Pi = 3.1415926536;void myDisplay(void) int i; / glShadeModel(GL_FLAT); / glShadeModel(GL_SMOOTH); glClear(GL_COLOR_BUFFER_BIT); g

13、lBegin(GL_TRIANGLE_FAN); glColor3f(1.0f, 1.0f, 1.0f); glVertex2f(0.0f, 0.0f); for(i=0; i<=8; +i) glColor3f(i&0x04, i&0x02, i&0x01); glVertex2f(cos(i*Pi/4), sin(i*Pi/4); glEnd(); glFlush();E.g.8 #include "stdafx.h"#include <GL/glut.h>static int day = 180; / day的变化：从0到35

14、9void myDisplay(void) glEnable(GL_DEPTH_TEST); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(75, 1, 1, 400000000); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0, -200000000, 200000000, 0, 0, 0, 0, 0, 1); / 绘制红色的"太阳&

15、quot; glColor3f(1.0f, 0.0f, 0.0f); glutSolidSphere(69600000, 200, 200); / 绘制蓝色的"地球" glColor3f(0.0f, 0.0f, 1.0f); glRotatef(day/360.0*360.0, 0.0f, 0.0f, -1.0f); glTranslatef(150000000, 0.0f, 0.0f); glutSolidSphere(15945000, 20, 20); / 绘制黄色的"月亮" glColor3f(1.0f, 1.0f, 0.0f); glRotat

16、ef(day/30.0*360.0 - day/360.0*360.0, 0.0f, 0.0f, -1.0f); glTranslatef(38000000, 0.0f, 0.0f); glutSolidSphere(4345000, 20, 20); glFlush();void keyboard(unsigned char key,int x,int y) switch (key) case 'f' : day =day +5; glutPostRedisplay(); break; case 'b': day =day -5; glutPostRedisp

17、lay(); break; default: break; int main(int argc, char* argv)glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); glutInitWindowPosition(100, 100); glutInitWindowSize(400, 400); glutCreateWindow("第一个OpenGL程序"); glutDisplayFunc(&myDisplay);glutKeyboardFunc(keyboard); g

18、lutMainLoop();return 0;E.g.9机器人手臂#include "stdafx.h"#include <GL/glut.h>static int shoulder =0,elbow =0; void init(void) glClearColor(0.0,0.0,0.0,0.0); glShadeModel(GL_FLAT); void display(void) glClear(GL_COLOR_BUFFER_BIT); glPushMatrix(); glTranslatef(-1.0,0.0,0.0); glRotatef(GLfloa

19、t)shoulder,0.0,0.0,1.0); glTranslatef(1.0,0.0,0.0); glPushMatrix(); glScalef(2.0,0.4,1.0); glutWireCube(1.0); glPopMatrix(); glTranslatef(1.0,0.0,0.0); glRotatef(GLfloat)elbow,0.0,0.0,1.0); glTranslatef(1.0,0.0,0.0); glPushMatrix(); glScalef(2.0,0.4,1.0); glutWireCube(1.0); glPopMatrix(); glPopMatri

20、x(); glutSwapBuffers(); void reshape(int w,int h) glViewport(0,0,(GLsizei)w,(GLsizei)h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(65.0,(GLfloat)w/(GLfloat)h,1.0,20.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0.0,0.0,-5.0); void keyboard(unsigned char key,int x,int y) switch (key) case 's' :/*s key rotates at shoulder */ shoulder =(shoulder +5)%360; glutPostRedisplay(); break; case 'S': shoulde