大一的时候学画法几何，感觉很难画三视图。近日，计算机图形学老师教了我们一个三视图的算法，感觉很好。特来发表。因为时间关系，我编了个特别简单的做为示例。

#include<graphics.h>
int dx[12]={0,60,60,0,0,60,60,0,60,0,60,0}; /*确定组合体X坐标*/
int dy[12]={0,0,120,120,0,0,40,40,80,80,120,120};/*确定组合体Y坐标*/
int dz[12]={0,0,0,0,80,80,80,80,40,40,40,40};/*确定组合体Z坐标*/
int ld[24]={0,1,2,3,0,4,5,6,7,4,10,11,9,8,10,2,3,11,8,6,9,7,1,5};/*确定连接各线的顺序*/
int tl[24]={0,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,0,1,0,1,0,1,0,1};
int i,j,vh=100,vw=120,x,y,x0=250,y0=200;
main()
{
int driver=DETECT,mode=0;
initgraph(&driver,&mode,"");
setbkcolor(BLUE);
setcolor(YELLOW);
zu();
fu();
zo();
fo();
getch();
closegraph();
}
zu()/*主视图*/
{
for(i=0;i<24;i )
{
j=ld[i];
x=x0-dx[j];
y=y0-dz[j];
if(tl[i]==0)
moveto(x,y);
lineto(x,y);
}
}

fu()/*俯视图*/

{
for(i=0;i<24;i )
{j=ld[i];
x=x0-dx[j];
y=y0 dy[j] vh;
if(tl[i]==0)
moveto(x,y);
lineto(x,y);
}
}

zo()/*侧视图*/

{
for(i=0;i<24;i )
{
j=ld[i];
x=x0 dy[j] vw;
y=y0-dz[j];
if(tl[i]==0)
moveto(x,y);
lineto(x,y);
}
}

fo()/*轴侧图*/

{
for(i=0;i<24;i )
{j=ld[i];
x=x0-0.7071*dx[j] 0.7071*dy[j] 150;
y=y0 0.4082*dx[j] 0.4082*dy[j]-0.8165*dz[j] 150;
if(tl[i]==0)
moveto(x,y);
lineto(x,y);
}
}