第二次试验.doc

附录一：绘制Bezier曲线#includegraphics.h#includeconio.h#includestdio.htypedef struct double x,y;DPOINT; /定义结构体class Bezier /定义Bezier类 private: DPOINT* bP; int m_maxIndex; void drawFrame(); void drawCurve(); void drawCurve(int p0,int p1,int p2,int p3); public: Bezier(DPOINT* p,int len); /定义构造函数 void draw();Bezier:Bezier(DPOINT* p,int len) /构造函数的实现 this -bP=p;m_maxIndex=len-1;void Bezier:draw() /通过公有函数调用私有函数 drawFrame();drawCurve();void Bezier:drawFrame() /其功能是绘制出多边形和各个端点setcolor(12);for(int i=0;im_maxIndex;i+)line( bPi.x, bPi.y, bPi+1.x, bPi+1.y ); /绘制多边形circle(bPi.x, bPi.y,5); /绘制各个端点circle(bPm_maxIndex.x,bPm_maxIndex.y,5);void Bezier:drawCurve() /实现多段Bezier曲线绘制的功能 for(int i=0;i=m_maxIndex-3;i+=3)drawCurve(i,i+1,i+2,i+3);void Bezier:drawCurve(int p0,int p1,int p2,int p3) /绘制某一段Bezier曲线的功能 double tmpx=0.0;double tmpy=0.0;double t=0.0;for(;t=1.0;t+=0.001)tmpx=(-bPp0.x+3*bPp1.x-3*bPp2.x+bPp3.x)*t*t*t+(3*bPp0.x-6*bPp1.x+3*bPp2.x)*t*t+(-3*bPp0.x+3*bPp1.x)*t+bPp0.x;tmpy=(-bPp0.y+3*bPp1.y-3*bPp2.y+bPp3.y)*t*t*t+(3*bPp0.y-6*bPp1.y+3*bPp2.y)*t*t+(-3*bPp0.y+3*bPp1.y)*t+bPp0.y;putpixel(tmpx,tmpy,3);void main() /主函数的实现int graphdriver=DETECT,graphmode;initgraph(&graphdriver,&graphmode,E:tc3bgi);setbkcolor(15);DPOINT* p;p=new DPOINT10; p0.x=50.0; p0.y=100.0; p1.x=80.0; p1.y=230.0;p2.x=100.0; p2.y=270.0; p3.x=140.0; p3.y=160.0;p4.x=180.0; p4.y=50.0; p5.x=240.0; p5.y=65.0;p6.x=270.0; p6.y=120.0; p7.x=330.0; p7.y=230.0;p8.x=380.0; p8.y=230.0; p9.x=430.0; p9.y=150.0;Bezier bzr(p,10);bzr.draw();delete p;getch();closegraph();运行结果为附录二：子程序affine.cdouble sin(),cos();double xmax=639.0,ymax=399.0;double f33,xx,yy;scx(double xj) int x; x=(int)(xj+xmax/2); return(x);scy(double yi) int y; y=(int)ymax-(int)(yi+(ymax/2); return(y);parallel(double dx,double dy) f00=1.0;f01=0.0;f02=0.0; f10=0.0;f11=1.0;f12=0.0; f20=dx;f21=dy;f22=1.0; return(0);rotate(double theta) double th; th=theta/180*3.1415927; f00=cos(th);f01=sin(th);f02=0.0; f10=-sin(th);f11=cos(th); f20=0.0;f21=0.0;f22=1.0; return(0);scale(double ss) f00=ss;f01=0.0;f02=0.0; f10=0.0;f11=ss;f12=0.0; f20=0.0;f21=0.0;f22=1.0; return(0);taishao_x() f00=1.0;f01=1.0;f02=0.0; f10=0.0;f11=-1.0;f12=0.0; f20=0.0;f21=0.0;f22=1.0; return(0);taishao_y() f00=-1.0;f01=1.0;f02=0.0; f10=0.0;f11=-1.0;f12=0.0; f20=0.0;f21=0.0;f22=1.0; return(0);taishao_o() f00=-1.0;f01=1.0;f02=0.0; f10=0.0;f11=-1.0;f12=0.0; f20=0.0;f21=0.0;f22=1.0; return(0);taishao_xy() f00=0.0;f01=1.0;f02=0.0; f10=1.0;f11=0.0;f12=0.0; f20=0.0;f21=0.0;f22=1.0; return(0);taishl(double aa,double bb,double cc) double y,p; y=bb*bb-aa*aa; p=aa*aa+bb*bb; f00=-y/p; f21=-2*aa*bb/p;f22=0.0; f10=-2*aa*bb/p;f11=-y/p; f12=0.0; f20=-2*aa*cc/p;f21=-2*bb*cc/p;f22=1.0; return(0);axis() line(scx(0),scy(-ymax/2),scx(0),scy(ymax/2); line(scx(-xmax/2),scy(0.0),scx(xmax/2),scy(0.0); return(0);tuoq(double a,double b) f00=1.0;f01=b;f02=0.0; f10=a;f11=1.0;f12=0.0; f20=0.0;f21=0.0;f22=1.0; return(0);affinex(double x,double y,double d) xx=x*f00+y*f10+d*f20; return(xx) ;affiney(double x,double y,double d) yy=x*f01+y*f11+d*f21; return(yy);附录三：四边形的旋转#include affine.c#includemain()int graphdriver=DETECT, graphmode;static double x1=0.0,10.0,100.0,110.0,0.0;static double y1=0.0,50.0,50.0,0.0,0.0; static double x25;static double y25;int i;double r,xx,yy;initgraph(&graphdriver,&graphmode,);for(r=0;r=360;r=r+10)rotate(r);for(i=0;i=4;i+)x2i=affinex(x1i,y1i,1.0);y2i=affiney(x1i,y1i,1.0)/2;for(i=0;i=3;i+)line(scx(x2i),scy(y2i),scx(x2i+1),scy(y2i+1);getch();closegraph();附录四：四边形的平移#includeaffine.c#include#define PI 3.1415926void main()int driver=DETECT,mode; static double x1=-20.0,0.0,30.0,10.0,-20.0; static double y1=0.0,17.0,-10.0,-20.0,0.0; static double x25;static double y25; int i; double r; initgraph(&driver,&mode, ); axis();for(r=0;r360;r=r+10) rotate(r); for(i=0;i=4;i+) x2i=affinex (x1i,y1i,1.0); y2i=affiney (x1i,y1i,1.0); parallel