南昌大学- -计算机图形学实验报告

南昌大学实验报告计算机图形学实验学生姓名：学号： 6100专业班级：计科112班教学老师：徐老师目录一、实验一直线和圆 (1)二、实验二填充算法 (5)三、实验三裁剪算法 (7)四、实验四曲线的绘制（Bezier） (11)五、实验五曲线的绘制（B样条） (14)南昌大学实验报告一学生姓名：学号：6100 专业班级：计科112 班实验类型：□验证■综合□设计□创新实验日期：实验成绩：一．实验名称直线和圆二．实验目的1、掌握中点画圆算法2、熟悉曲线的整数加减来计算沿圆周的像素位置三．实验内容1、使用中点画圆算法，熟悉算法的内容和原理。

2、通过改变参数值设定背景色和圆的大小四．实验结果如图2-1.画直线算法如图2-2.中点画圆算法五．程序源码：//Line.cpp#include<GL/glut.h>void init(void){glClearColor(1.0,1.0,1.0,0.0) ;glMatrixMode(GL_PROJECTION);gluOrtho2D(0.0,200.0,0.0,150.0);}void lineSegment(void){glClear(GL_COLOR_BUFFER_BIT);glColor3f(1.0,0.0,0.0);glBegin(GL_LINES);glVertex2i(180,15);glVertex2i(10,145);glEnd();glFlush();}void main(int argc,char**argv) {glutInit(&argc,argv);glutInitDisplayMode(GLUT_SING LE|GLUT_RGB);glutInitWindowPosition(50,100 );glutInitWindowSize(400,300);glutCreateWindow("Line");init();glutDisplayFunc(lineSegment);glutMainLoop();}`#include<GL/glut.h> void init(void) {glClearColor(1.0,1.0,1.0,0.0);glMatrixMode(GL_PROJECTION);gluOrtho2D(0.0,200.0,0.0,150.0);}class screenPt{private:GLint x,y;public:screenPt(){x=y=0;}void setCoords(GLint xCoordValue,GLint yCoordValue){x=xCoordValue;y=yCoordValue;}GLint getx()const{return x;}GLint gety()const{return y;}void incrementx(){x++;}void decrementy(){y--;}};void setPixel(GLint xCoord,GLint yCoord){glBegin(GL_POINTS);glVertex2i(xCoord,yCoord);glEnd();}void circleMidpoint(GLint xc,GLint yc,GLint radius){screenPt circPt;GLint p=1-radius;circPt.setCoords(0,radius);voidcirclePlotPoints(GLint,GLint,scr eenPt);circlePlotPoints(xc,yc,circPt );while(circPt.getx()<circPt.ge ty()){circPt.incrementx();if(p<0)p+=2*circPt.getx()+1;else{circPt.decrementy();p+=2*(circPt.getx()-circPt.ge ty())+1;}circlePlotPoints(xc,yc,circPt );}}void circlePlotPoints(GLint xc,GLint yc,screenPt circPt){setPixel(xc+circPt.getx(),yc+ circPt.gety());setPixel(xc-circPt.getx(),yc+ circPt.gety());setPixel(xc+circPt.getx(),yc-circPt.gety());setPixel(xc-circPt.getx(),yc-circPt.gety());setPixel(xc+circPt.gety(),yc+ circPt.getx());setPixel(xc-circPt.gety(),yc+ circPt.getx());setPixel(xc+circPt.gety(),yc-circPt.getx());setPixel(xc-circPt.gety(),yc-circPt.getx());}void display(void){screenPt a;glClear(GL_COLOR_BUFFER_BIT);glColor3f(1.0,0.0,0.0);//glViewport(0,0,500,500);circleMidpoint(90,90,50);circlePlotPoints(8,8,a);glFlush();}void main(int argc,char**argv) {glutInit(&argc,argv);glutInitDisplayMode(GLUT_SING LE|GLUT_RGB);glutInitWindowPosition(50,100 ); glutInitWindowSize(400,300);glutCreateWindow("Circle"); init();glutDisplayFunc(display);glutMainLoop();}南昌大学实验报告二学生姓名：学号：6100 专业班级：计科112 班实验类型：□验证■综合□设计□创新实验日期：实验成绩：一．实验名称：区域填充二．实验目的1、掌握种子填充算法。

三．实验内容1、熟悉和掌握种子填充算法。

四．实验结果如图3-1.区域填充五．程序源码：#include<GL/glut.h>#include<stdlib.h>#include<math.h>#include<windows.h>void init(void){glClearColor(1.0,1.0,1.0,0.0);glMatrixMode(GL_PROJECTION);gluOrtho2D(0.0,300.0,0.0,300.0);/ /初始化投影窗口，保持与显示的窗口一致}void setPixel(int x,int y,long fillColor)//定义setPixel函数{glColor3f(fillColor<<16,fillColor <<8,fillColor);glBegin(GL_POINTS);glVertex2i(x,y);glEnd();}void boundaryFill4(int x,int y,long fillColor,long borderColor)//递归的边界填充算法{unsigned char params[3];long interiorColor;glReadPixels(x,y,1,1,GL_RGB,GL_UN SIGNED_BYTE,params);interiorColor=RGB(params[0],param s[1],params[2]);//内部颜色获取if(interiorColor!=borderColor&&in teriorColor!=fillColor)//递归{setPixel(x,y,fillColor);boundaryFill4(x+1,y,fillColor,bor derColor);//boundaryFill4(x-1,y,fillColor,bor derColor);//左boundaryFill4(x,y+1,fillColor,bor derColor);//上boundaryFill4(x,y-1,fillColor,bor derColor);//下}}void lineSegment(void){long borderColor=RGB(255,0,0);//定义边界颜色long fillColor=RGB(0,0,255);//定义填充颜色glClear(GL_COLOR_BUFFER_BIT);glColor3f(255,0,0);glBegin(GL_LINE_LOOP);//画填充的六边形glVertex2i(0,40);glVertex2i(20,0);glVertex2i(60,0);glVertex2i(80,40);glVertex2i(60,80);glVertex2i(20,80);glEnd();boundaryFill4(60,60,fillColor,bor derColor);//调用递归函数glFlush();}void main(int argc,char** argv){glutInit(&argc,argv);glutInitDisplayMode(GLUT_SINGLE|G LUT_RGB);glutInitWindowPosition(150,100);glutInitWindowSize(300,300);glutCreateWindow("种子填充");init();glutDisplayFunc(lineSegment);glutMainLoop();}南昌大学实验报告三学生姓名：学号：610 专业班级：计科112 班实验类型：□验证■综合□设计□创新实验日期：实验成绩：一．实验名称：裁剪算法二．实验目的1、掌握梁友栋算法。

2、提高程序编写能力。

三．实验内容1、掌握梁友栋算法2、学会编写程序四．实验结果如图1.梁友栋-Barsky线段裁剪五．程序源码#include <stdio.h>#include <gl\glut.h>#include <stdlib.h>#include <math.h>class wcPt2D{public:GLfloat x,y;void setCoords(GLfloat xCoord,GLfloatyCoord){x=xCoord;y=yCoord;}GLfloat getx() const{return x;}GLfloat gety() const{return y;} };inline GLint round(const GLfloat a){return GLint(a+0.5);}void setPixel(int x,int y){glBegin(GL_POINTS);glVertex2i(x,y);glEnd();}void init(){glClearColor(1.0,1.0,1.0,0.0);glMatrixMode (GL_PROJECTION);gluOrtho2D(-200.0,200.0,-200.0,20 0.0);}void lineBres(GLfloat x0,GLfloat y0,GLfloat xEnd,GLfloat yEnd){int dx = fabs(xEnd - x0),dy = fabs(yEnd - y0);int p = 2*dy - dx;int twoDy = 2*dy,twoDyMinusDx = 2*(dy - dx);int x,y;if(x0>xEnd){x = xEnd;y = yEnd;xEnd = x0;}else{x = x0;y = y0;}setPixel(x,y);while(x<xEnd){x++;if(p<0)p+=twoDy;else{y++;p+=twoDyMinusDx;}setPixel(x,y);}}GLint clipTest(GLfloat p,GLfloat q,GLfloat *u1,GLfloat *u2){GLfloat r;GLint Value = true;if(p<0.0){r = q/p;if(r>*u2)Value = false;elseif(r>*u1)*u1 = r;}elseif(p>0.0){r = q/p;if(r<*u1)Value = false;else if(r<*u2)*u2 = r;}elseif(q<0.0)Value = false;return(Value);}void lineClipLiangBarsk(wcPt2D winMin,wcPt2D winMax,wcPt2D p1,wcPt2D p2){GLfloat u1 = 0.0,u2 = 1.0,dx = p2.getx()-p1.getx(),dy;GLfloat x1 = p1.getx(),y1 = p1.gety();GLfloat x2 = p2.getx(),y2 = p2.gety();if(clipTest(-dx,p1.getx()-winMin. getx(),&u1,&u2))if(clipTest(dx,winMax.getx()-p1.g etx(),&u1,&u2)){dy = p2.gety()-p1.gety();if(clipTest(-dy,p1.gety()-winMin. gety(),&u1,&u2)){if(clipTest(dy,winMax.gety()-p1.g ety(),&u1,&u2)){if(u2<1.0){p2.setCoords(p1.getx()+u2*dx,p1.g ety()+u2*dy);}if(u1>0.0){p1.setCoords(p1.getx()+u1*dx,p1.g ety()+u1*dy);}glColor3f(0.0,1.0,0.0);//裁剪了的线的颜色。