3d.cpp

create 3D by 2D.I do not know i can do it well because i am learning

#include "conio.h"
#include "stdio.h"
#include "graphics.h"
#include "dos.h"
typedef struct
{
	float x1, y1;
}POINT1;
typedef struct
{
	POINT1 b[100];
}HINH2D;
typedef struct
{
	int x, y,z;
}POINT;
typedef struct
{
	POINT a[100];
}HINH;
void nhap(HINH &A,int &n)
{
	printf("nhap n : ");
	scanf("%d",&n);
	for(int i=1;i<=n;i++)
	{
		printf("\nnhap X[%d] : ",i);
		scanf("%d",&A.a[i].x);
		printf("\nnhap Y[%d] : ",i);
		scanf("%d",&A.a[i].y);
		printf("\nnhap Z[%d] : ",i);
		scanf("%d",&A.a[i].z);
		printf("\n----------------------------------\n");
	}
}
float xacdinh_x(int x1,int x2)
{
	float a=getmaxx()/2;
	float b=getmaxy()/2;
	float x=a-x1*0.7975;
	float y=(-b/a)*x+2*b;
	float xx=a+x2*0.7975;
	float yy=(b/a)*xx;
	return( ((yy-y)+(b/a)*(xx+x)) / ((2*b)/a));
}
float xacdinh_y(int x1,int x2)
{
	float a=getmaxx()/2;
	float b=getmaxy()/2;
	float x=a-x1*0.7975;
	float y=(-b/a)*x+2*b;
	return( (b/a)*xacdinh_x(x1,x2)+y-(b/a)*x);
}
void ve(HINH A,int n)
{
	HINH2D B;
	int m,k,i=1;
	while(i<=n)
	{
		B.b[i].x1=xacdinh_x(A.a[i].x,A.a[i].y);
		B.b[i].y1=xacdinh_y(A.a[i].x,A.a[i].y)-A.a[i].z;
		i++;
	}
	printf("\n day co bao nhieu dinh ? ");
	scanf("%d",&m);
	k=n;   // n ban dau
	n=2*m;
	for(int j=k+1;j<=n;j++)
	{
		B.b[j]=B.b[k];
	}
	i=1;
	while(i<m)
	{
		line(B.b[i].x1,B.b[i].y1,B.b[i+1].x1,B.b[i+1].y1);
		line(B.b[i+m].x1,B.b[i+m].y1,B.b[i+m+1].x1,B.b[i+m+1].y1);
		line(B.b[i].x1,B.b[i].y1,B.b[i+m].x1,B.b[i+m].y1);
		i++;
	}
	if(B.b[n].x1==B.b[k].x1 && B.b[n].y1==B.b[k].y1)
	{
		line(B.b[m].x1,B.b[m].y1,B.b[1].x1,B.b[1].y1);
		line(B.b[n].x1,B.b[n].y1,B.b[k].x1,B.b[k].y1);
		line(B.b[m].x1,B.b[m].y1,B.b[n].x1,B.b[n].y1);
	}
	else
	{
		line(B.b[m].x1,B.b[m].y1,B.b[1].x1,B.b[1].y1);
		line(B.b[n].x1,B.b[n].y1,B.b[m+1].x1,B.b[m+1].y1);
		line(B.b[m].x1,B.b[m].y1,B.b[n].x1,B.b[n].y1);
	}
}
void main()
{
	int n,nn=0,m=0;
	HINH A;
	nhap(A,n);
	initgraph(&nn,&m,"C:\\TC\\BGI");
   /*	float a=getmaxx()/2;
	float b=getmaxy()/2;
	printf("(%f,%f)",2*a,2*b);
	line(a,b,0,2*b);
	line(a,b,2*a,2*b);
	line(a,b,a,0);    */
	ve(A,n);
	getch();
	closegraph();
}