Write a Program to implement Parallel Projection in 3-Dimensions.

 

Write a Program to implement Parallel Projection in 3-Dimensions.

1. #include<iostream.h>  
2. #include<conio.h>  
3. #include<graphics.h>  
4. #include<math.h>  
5. #include<stdio.h>  
6. #include<stdlib.h>  
7. #define pi 3.14  
8. class per  
9. {  
10.     float x[10], y[10], z [10], d, m[10], q1[10], r1[10], m1[10];  
11.     float x1 [10], y1[10], xm, ym, z1 [10], cav[4] [4], p[10] [10];  
12.     float p1[10] [10];  
13.     float a, b, c, ang, theta, f;  
14.     int i, k, j, n;  
15.     public:  
16.     void get();  
17.     void par_v();  
18.     void par_vnr0();  
19.     void map();  
20.     void graph();  
21.     void project(float m[],float q[], float r[]);  
22. };  
23. void per:: perproject(float m[], float q[], float r[])  
24. {  
25.     cout<<"\n ENTER WIDTH FOR Z-AXIS d";  
26.     cin>>d;  
27.     cout<< "\n AFTER PROJECTION, VERTICES OF POLYGON ARE--";  
28.             for(i=0;i<n;i++)  
29.     {  
30.         cout<<"x?["<<i<<"]="<<x1[i]<< "\t";  
31.         cout<<"y?["<<i<<"]="<<y1[i]<< "\t";  
32.         cout<<"z?["<<i<<"]="<<z1[i]<< "\t";  
33.         cout<<"\n";  
34.     }  
35.     getch();  
36.     clearviewport();  
37.     graph();  
38.     for(i=0;i<n-1;i++)  
39.     {  
40.         line(m[i]*100+xm,(-q[i]*100+ym),m[i+1]*100+xm,(-n1[i+1]*100+ym));  
41.   
42.             }  
43.     line(m[n-1]*100+xm,(-q[n-1]*100+ym),m[0]*100+xm,(-q[0]*100+ym));  
44. getch();  
45. }  
46. void per::get()  
47. {  
48.     cout<< "\n ENTER OF VERTICES";  
49.             cin>>n;  
50.     cout<<"\n ENTER";  
51.             for (i=0;i<n;i++)  
52.     {  
53.         cout<<"\n x["?i<<"], y["<<i<<"] and z ["<<i<<"]";  
54.         cin>>x[i]>>y[i]>>z[i];  
55.     }  
56.         cout<<"\n ENTER WIDTH FOR Z-AXIS-d";  
57.         cin>>d;  
58.         int ch=100;  
59.         do  
60.         {  
61.             cout<< "\n 1->orthographic projection";  
62.                                 cout<<"\n 2->oblique projection";  
63.                                 cout<<"\n 0-> exit";  
64.             cout<<"\n enter ch";  
65.             cin>>ch;  
66.             switch (ch)  
67.             {  
68.                 case1:  
69.                     int ch1=100;  
70.                 do  
71.                 {  
72.                     cout<<"\n 1->for xy viewplane";  
73.                     cout<<"\n 2->for yz viewplane";  
74.                     cout"\n 3->for zx viewplane";  
75.                     cout<<"\n 0->exit";  
76.                     cout<<"\n enter ch1";  
77.                     cin>>ch1;  
78.                     switch(ch1)  
79.                     {  
80.                         case1:  
81.                             x1[i]=x[i];  
82.                             y1[i]=y[i];  
83.                             z1[i]=0;  
84.                             project(x1,y1,z1);  
85.                             break;  
86.                         case2:  
87.                             x1[i]=0;  
88.                             y1[i]=0;  
89.                             z1[i]=z[i];  
90.                             project(x1,y1,z1);  
91.                             break;  
92.                         case3:  
93.                             x1[i]=x[i];  
94.                             y1[i]=0;  
95.                             z1[i]=z[i];  
96.                             project(x1,y1,z1);  
97.                             break;  
98.                     }  
99.                 }  
100.             while (ch!=0)  
101.                  break;  
102.                    case2:  
103.                 ch1=100;  
104.                 do  
105.                 {  
106.                     cout<<"\n 1->on xy plane";  
107.                     cout<<"\n 2->cavalier";  
108.                     cout<<"\n 0->exit";  
109.                     cout<<"\n enter ch1";  
110.                     cin>>ch1;  
111.                     switch(ch1)  
112.                     {  
113.                         case1:  
114.                             par_v();  
115.                             break;  
116.                         case2:  
117.                             par_vnr0();  
118.                             break();  
119.                     }  
120.                     while(ch!=0);  
121.                     break;  
122.                 }  
123.                 while(ch!=0)  
124.             }  
125.     void per::par_v()  
126.     {  
127.         cout<<"\n enter v (a, b, c) " ;  
128.         cin>>a>>b>>c;  
129.         for(i=0; i<n;i++)  
130.         {  
131.             x1[i]=x[i]-((a*z[i]/c);  
132.             y1[i]=y[i]-((b*z[i]/c);  
133.             project(x1,y1, z1);  
134.         }  
135.          }  
136.         void per::par_vnr0()  
137.         {  
138.         cout<<"\n enter f";  
139.         cin>>f;  
140.         cout<<"\n enter angle";  
141.         cin>>angle;  
142.         theta= ((pi/180)* ang);  
143.         for(i=0;i<4;i++)  
144.         {  
145.             for(j=0;j<4;j++)  
146.             {  
147.                 if(i==j)  
148.                 cav[i] [j]=1;  
149.                 else  
150.                     cav[i] [j]=0;  
151.             }  
152.         }  
153.         cav[0] [2]=f*cos(theta);  
154.         cav[1][2]=f*sin (theta);  
155.         cav[2][2]=0;  
156.         for(i=0;i<n;i++)  
157.         {  
158.             p[0][i]=x[i];  
159.             p[1][i]=y[i];  
160.             p[2][i]=z[i];  
161.             p[3][i]=1;  
162.         }  
163.         for(i=0;i<4;i++)  
164.         {  
165.             for(j=0;j<n;j++)  
166.             {  
167.                 p1[i][j]=0;  
168.                 for(k=0;k<4;k++)  
169.                 {  
170.                     p1[i][j]+=cav[i][k]*p[k][j];  
171.                 }  
172.             }  
173.         }  
174.         for(i=0;i<n;i++)  
175.         {  
176.             x1[i]=p1[0][i];  
177.             y1[i]=p1[1][i];  
178.             z1[i]=p1[i];  
179.         }  
180.         project(x1,y1,z1);  
181.         }  
182. void per :: map()  
183. {  
184.     int gd=DETECT;  
185.     initgraph (&gd, &gm, "");  
186.     int errorcode = graphresult();  
187.     /*an error occurred */  
188.            if (errorcode!=grOK)  
189.     {  
190.         printf("Graphics error: %s \n",grapherrormsg (errorcode));  
191.                       printf("Press and key to halt: ");  
192.                       getch();  
193.                       exit(1); /* terminate with an error code */  
194.             }  
195. }  
196. void per::graph()  
197. {  
198.     xm= get maxx()/2;  
199.     ym=get maxy()/2  
200.     line (xm,0, xm, 2 * ym);  
201.     line (0, ym, 2 * xm, ym);  
202. }  
203. void main()  
204. {  
205.     class per a;  
206.     clrscr();  
207.     a.map();  
208.     a.get();  
209.     getch();  
210. }  

Output

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