计算机图形学实验C++代码.doc

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1、一、bresenham算法画直线#include#include#includevoiddraw_pixel(intix,intiy){glBegin(GL_POINTS);glVertex2i(ix,iy);glEnd();}voidBresenham(intx1,inty1,intxEnd,intyEnd){intdx=abs(xEnd-x1),dy=abs(yEnd-y1);intp=2*dy-dx;inttwoDy=2*dy,twoDyMinusDx=2*dy-2*dx;intx,y;if(x1>xEnd){x

2、=xEnd;y=yEnd;xEnd=x1;}else{x=x1;y=y1;}draw_pixel(x,y);while(x

3、e(1.0);glMatrixMode(GL_PROJECTION);glLoadIdentity();gluOrtho2D(0.0,500.0,0.0,500.0);}voidmain(intargc,char**argv){glutInit(&argc,argv);glutInitDisplayMode(GLUT_SINGLE

4、GLUT_RGB);glutInitWindowSize(500,500);glutInitWindowPosition(200.0,200.0);glutCreateWindow("CG_test_Bresenham_Lineexampl

5、e");glutDisplayFunc(display);myinit();glutMainLoop();}一、中点法绘制椭圆#include#include#includeinlineintround(constfloata){returnint(a+0.5);}voidsetPixel(GLintxCoord,GLintyCoord){glBegin(GL_POINTS);glVertex2i(xCoord,yCoord);glEnd();}voidellipseMidpoint(intxCenter,intyCe

6、nter,intRx,intRy){intRx2=Rx*Rx;intRy2=Ry*Ry;inttwoRx2=2*Rx2;inttwoRy2=2*Ry2;intp;intx=0;inty=Ry;intpx=0;intpy=twoRx2*y;voidellipsePlotPoints(int,int,int,int);11ellipsePlotPoints(xCenter,yCenter,x,y);p=round(Ry2-(Rx2*Ry)+(0.25*Rx2));while(px

7、y-=twoRx2;p+=Ry2+px-py;}ellipsePlotPoints(xCenter,yCenter,x,y);}p=round(Ry2*(x+0.5)*(x+0.5)+Rx2*(y-1)*(y-1)-Rx2*Ry2);while(y>0){y--;py-=twoRx2;if(p>0)p+=Rx2-py;else{x++;px+=twoRy2;p+=Rx2-py+px;}ellipsePlotPoints(xCenter,yCenter,x,y);}}voidellipsePlotPoints(intxCenter,intyCenter,intx,int

8、y){setPixel(xCenter+x,yCenter+y);setPixel(xCenter-x,yCenter+y);setPixel(xCenter+x,yCenter-y);setPixel(xCenter-x,yCenter-y);}voiddisplay(){glClear(GL_COLOR_BUFFER_BIT);ellipseMidpoint(200,200,50,30);glFlush();}voidmyinit(){glClearColor(0.8,1.0,1.0,1.0);glColor3f(0.0,0.0,1.0);glP