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lab5.c
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//backface elimination of wire frame objects
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <FPT.h>
#include "M3d_matrix_tools.c"
int numpoints[10];
double x[10][15000], y[10][15000], z[10][15000], display_x[10][15000], display_y[10][15000];
int numpolys[10];
int psize[10][15000];
int con[10][15000][8];
int numobjects, poly_size, q, s, sign, action,k;
double xp[15000], yp[15000], x_prime[10][15000], y_prime[10][15000];
double half_angle = 40;
double V[4][4], translated[4][4], rotated[4][4];
double cs, sn, avx, avy, avz;
int backface_sign = 1;
int color = 1;
int backface_eliminate(int key, int polynum){
double A[3], B[3], C[3], D[3], E[3], perpendicular[3], origin[3], dot;
A[0] = x[key][con[key][polynum][0]]; A[1] = y[key][con[key][polynum][0]]; A[2] = z[key][con[key][polynum][0]];
B[0] = x[key][con[key][polynum][1]]; B[1] = y[key][con[key][polynum][1]]; B[2] = z[key][con[key][polynum][1]];
C[0] = x[key][con[key][polynum][2]]; C[1] = y[key][con[key][polynum][2]]; C[2] = z[key][con[key][polynum][2]];
D[0] = B[0] - A[0]; D[1] = B[1] - A[1]; D[2] = B[2] - A[2];
E[0] = C[0] - A[0]; E[1] = C[1] - A[1]; E[2] = C[2] - A[2];
perpendicular[0] = D[1]*E[2] - E[1]*D[2];
perpendicular[1] = -(D[0]*E[2] - E[0]*D[2]);
perpendicular[2] = D[0]*E[1] - E[0]*D[1];
origin[0] = -A[0]; origin[1] = -A[1]; origin[2] = -A[2];
dot = backface_sign*(perpendicular[0]*origin[0] + perpendicular[1]*origin[1] + perpendicular[2]*origin[2]);
if(dot > 0){
return 1;
}
else{
return 0;
}
}
void move_to_screen(int key){
double H, scale_factor;
H = tan(half_angle);
scale_factor = 300/H;
for(int i =0; i<numpoints[key]; i++){
y_prime[key][i] = (y[key][i])/(z[key][i]);
x_prime[key][i] = (x[key][i])/(z[key][i]);
display_y[key][i] = (y_prime[key][i]*scale_factor)+300;
display_x[key][i] = (x_prime[key][i]*scale_factor)+300;
}
}
void draw_image(int key){
double h;
int eliminated;
move_to_screen(key);
for(int i = 0; i<numpolys[key]; i++){
poly_size = psize[key][i];
for(int j = 0; j<poly_size; j++){
h = con[key][i][j] ;
xp[j] = display_x[key][con[key][i][j]];
yp[j] = display_y[key][con[key][i][j]];
}
eliminated = backface_eliminate(key, i);
if(eliminated != 0){
if(color < 3){
G_rgb(0.9, 0.1, 0.5);
}
else if(color >= 3 && color < 5){
G_rgb(0.9, 0.5, 0.2);
}
else if(color >= 5 && color < 7){
G_rgb(0.8, 0.6, 0.1);
}
else if(color >= 7 && color < 9){
G_rgb(0, 0.7, 0.4);
}
else if(color >= 9 && color < 11){
G_rgb(0.2,0.5,0.8);
}
else if(color >= 11){
G_rgb(0.7, 0.7, 1);
}
G_polygon(xp,yp,poly_size);
}
}
}
int main(int argc, char **argv){
FILE *fp;
int key = 0;
numobjects = argc-1;
G_init_graphics(600,600);
G_rgb(0,0,0);
G_clear();
for(key = 0; key<numobjects; key++){
fp = fopen(argv[key+1], "r");
if(fp == NULL){
printf("Broken File\n");
exit(0);
}
fscanf(fp, "%d", &numpoints[key]);
for(int i = 0; i<numpoints[key]; i++){
fscanf(fp, "%lf %lf %lf", &x[key][i], &y[key][i], &z[key][i]);
}
fscanf(fp, "%d", &numpolys[key]);
for(int j = 0; j<numpolys[key]; j++){
fscanf(fp, "%d", &psize[key][j]);
for(int k = 0; k<psize[key][j]; k++){
fscanf(fp, "%d", &con[key][j][k]);
}
}
move_to_screen(key);
draw_image(key);
}
q = '0';
s = '0';
sign = 1;
action = 't';
key = 0;
while(1==1){
M3d_make_identity(V); M3d_make_identity(translated), M3d_make_identity(rotated);
q = G_wait_key();
if(q =='q'){
exit(0);}
else if(q == 'c'){
sign = -sign;
}
else if(q == 'b'){
backface_sign = -backface_sign;
}
else if(q == 't'){
action = q;}
else if(q == 'r'){
action = q;}
else if(('0' <= q) && (q <= '9')){
k = q - '0';
if(k < numobjects){
key = k;}}
else if((q=='x') && (action == 't')){
if(sign > 0){
M3d_make_translation(V, 0.2, 0., 0.);
}
else{
M3d_make_translation(V, -0.2, 0., 0.);
}
}
else if((q == 'y') && (action == 't')){
if(sign > 0){
M3d_make_translation(V, 0, 0.2, 0.);
}
else{
M3d_make_translation(V, 0, -0.2, 0.);
}
}
else if((q == 'z') && (action == 't')){
if(sign > 0){
M3d_make_translation(V, 0., 0., 0.2);
}
else{
M3d_make_translation(V, 0., 0., -0.2);
}
}
else if((q == 'x') && (action == 'r')){
avy = 0; avz = 0;
for (int i = 0; i<numpoints[key]; i++){
avy += y[key][i];
avz += z[key][i];
}
avy = avy/numpoints[key];
avz = avz/numpoints[key];
M3d_make_translation(translated, 0, -avy, -avz);
M3d_mat_mult_points(x[key], y[key], z[key], translated, x[key], y[key], z[key], numpoints[key]+1);
if(sign > 0){
cs = cos(M_PI/180);
sn = sin(M_PI/180);
M3d_make_x_rotation_cs(rotated, cs, sn);
M3d_mat_mult_points(x[key], y[key], z[key], rotated, x[key], y[key], z[key], numpoints[key]+1);
if(color < 13){
color ++;
}
else{
color = 1;
}
}
else{
cs = cos(-M_PI/180);
sn = sin(-M_PI/180);
M3d_make_x_rotation_cs(rotated, cs, sn);
M3d_mat_mult_points(x[key], y[key], z[key], rotated, x[key], y[key], z[key], numpoints[key]+1);
if(color < 13){
color ++;
}
else{
color = 1;
}
}
M3d_make_translation(V, 0, avy, avz);
}
else if((q == 'y') && (action == 'r')){
avx = 0; avz = 0;
for(int i = 0; i<numpoints[key]; i++){
avx += x[key][i];
avz += z[key][i];
}
avx = avx/numpoints[key];
avz = avz/numpoints[key];
M3d_make_translation(translated, -avx, 0, -avz);
M3d_mat_mult_points(x[key], y[key], z[key], translated, x[key], y[key], z[key], numpoints[key]+1);
if(sign>0){
cs = cos(M_PI/180);
sn = sin(M_PI/180);
M3d_make_y_rotation_cs(rotated, cs, sn);
M3d_mat_mult_points(x[key], y[key], z[key], rotated, x[key], y[key], z[key], numpoints[key]+1);
if(color < 13){
color ++;
}
else{
color = 1;
}
}
else{
cs = cos(-M_PI/180);
sn = sin(-M_PI/180);
M3d_make_y_rotation_cs(rotated, cs, sn);
M3d_mat_mult_points(x[key], y[key], z[key], rotated, x[key], y[key], z[key], numpoints[key]+1);
if(color < 13){
color ++;
}
else{
color = 1;
}
}
M3d_make_translation(V, avx, 0, avz);
}
else if((q == 'z') && (action == 'r')){
avx = 0; avy = 0;
for(int i = 0; i<numpoints[key]; i++){
avx += x[key][i];
avy += y[key][i];
}
avx = avx/numpoints[key];
avy = avy/numpoints[key];
M3d_make_translation(translated, -avx, -avy, 0);
M3d_mat_mult_points(x[key], y[key], z[key], translated, x[key], y[key], z[key], numpoints[key]+1);
if(sign>0){
cs = cos(M_PI/180);
sn = sin(M_PI/180);
M3d_make_z_rotation_cs(rotated, cs, sn);
M3d_mat_mult_points(x[key], y[key], z[key], rotated, x[key], y[key], z[key], numpoints[key]+1);
if(color < 13){
color ++;
}
else{
color = 1;
}
}
else{
cs = cos(-M_PI/180);
sn = sin(-M_PI/180);
M3d_make_z_rotation_cs(rotated, cs, sn);
M3d_mat_mult_points(x[key], y[key], z[key], rotated, x[key], y[key], z[key], numpoints[key]+1);
if(color < 13){
color ++;
}
else{
color = 1;
}
}
M3d_make_translation(V, avx, avy, 0);
}
else{
printf("no action\n");
}
M3d_mat_mult_points(x[key], y[key], z[key], V, x[key], y[key], z[key], numpoints[key]+1);
G_rgb(0,0,0);
G_clear();
draw_image(key);
}
}