void drawit(int i) {
int k, j;
double tempx[points[i]], tempy[points[i]];
double plane_x[points[i]], plane_y[points[i]], plane_z[points[i]];
double mod = (HEIGHT / 2) / tan(halfangle * (M_PI / 180));
for (k = 0; k < polys[i]; k++) {
j = 0;
while (j < shapes[i][k]) {
// printf("%d", shapeorder[i][k][j]);
if (fabs(z[i][shapeorder[i][k][j]]) > 10e-7) { //Checks if z == 0
tempx[j] = mod * (x[i][shapeorder[i][k][j]] /
z[i][shapeorder[i][k][j]]) + (WIDTH / 2);
tempy[j] = mod * (y[i][shapeorder[i][k][j]] /
z[i][shapeorder[i][k][j]]) + (HEIGHT / 2);
plane_x[j] = x[i][shapeorder[i][k][j]];
plane_y[j] = y[i][shapeorder[i][k][j]];
plane_z[j] = z[i][shapeorder[i][k][j]];
j++;
} else {
j++;
}
}
if (check_if_behind(plane_x, plane_y, plane_z, j) == 1) {
G_rgb(1, 0, .3);
G_polygon(tempx, tempy, j);
}
}
}
int main()
// this tests clipping of polygon to convex window
//prefix -p == polygon; prefix -w == window
{
int pn, wn ;
double pt[2], u, v, q ;
double px[100] = { 70, 460, 400} ;
double py[100] = { 350, 25, 550} ;
pn = 3 ;
double wx[100] = { 100, 600, 550, 150} ;
double wy[100] = { 150, 200, 450, 500} ;
wn = 4 ;
srand48(100) ;
G_init_graphics (700, 700) ;
G_rgb (0, 0, 0) ;
G_clear() ;
G_rgb (1, 0, 0) ;
G_polygon(wx, wy, wn) ;
G_rgb (0, 0, 1) ;
G_polygon(px, py, pn) ;
q = G_wait_key() ;
pn = Clip_Polygon_Against_Convex_Window (px, py, pn, wx, wy, wn) ;
G_rgb (1, 1, 0) ;
for (int i = 0; i < pn; i++) {
G_fill_circle(px[i], py[i], 2);
printf("x:%.2lf, y:%.2lf\n", px[i], py[i]);
}
G_fill_polygon(px, py, pn) ;
q = G_wait_key() ;
}
int main()
{
double j ;
char q ;
G_init_graphics(601, 601) ;
// the original design was for a 400x400
// window and the object is centered on 200,200
// so we recenter it and make it larger
translate(-200, -200) ;
scale(2.0) ;
translate(300, 300) ;
j = 0 ;
while (j < 100) {
G_rgb(0,0,0) ;
G_clear() ;
G_rgb(0, 0.5, 1) ;
G_fill_polygon(x,y,n) ;
G_rgb(1, 1, 0) ;
G_polygon(x,y,n) ;
// q = G_wait_key() ;
G_display_image() ;
usleep(25000) ; // microseconds
translate(-300, -300) ;
scale(0.95) ;
rotate(4) ;
translate(300, 300) ;
j=j+1 ;
}
G_rgb(1,0,0) ;
G_fill_circle(300,300, 50) ;
q = G_wait_key() ;
}
void display(int pnum, int sign, int specpow, double diffusepro, double ambient, double lightx, double lighty, double lightz){
int i, j, k, m;
G_rgb(0,0,0);
G_clear();
double halfAngle = 30*M_PI/180;
G_clear(1,1,1);
if(sign == 0){
sign = -1;
}else{
sign=1;
}
int n=0;
for(n=0; n<plsize; n++){
double xtemp[100];
double ytemp[100];
double ztemp[100];
for(j=0; j<poly_sizes[polyLoc[n].objnum][polyLoc[n].polynum];j++){
xtemp[j] = x[polyLoc[n].objnum][polygons[polyLoc[n].objnum][polyLoc[n].polynum][j]];
ytemp[j] = y[polyLoc[n].objnum][polygons[polyLoc[n].objnum][polyLoc[n].polynum][j]];
ztemp[j] = z[polyLoc[n].objnum][polygons[polyLoc[n].objnum][polyLoc[n].polynum][j]];
}
int tempsize = poly_sizes[polyLoc[n].objnum][polyLoc[n].polynum];
double perpendicular[3], first[3], second[3], eye[3], light[3],reflection[3];
tempsize = Clip_Polygon_Against_Window(xtemp,ytemp,ztemp, poly_sizes[polyLoc[n].objnum][polyLoc[n].polynum]);
if(tempsize < 1)continue;
first[0] = xtemp[0]-xtemp[1];
first[1] = ytemp[0]-ytemp[1];
first[2] = ztemp[0]-ztemp[1];
second[0] = xtemp[0]-xtemp[2];
second[1] = ytemp[0]-ytemp[2];
second[2] = ztemp[0]-ztemp[2];
eye[0] = 0 - xtemp[0] ;
eye[1] = 0 - ytemp[0] ;
eye[2] = 0 - ztemp[0] ;
light[0]= lightx - xtemp[0] ;
light[1]= lighty - ytemp[0] ;
light[2]= lightz - ztemp[0] ;
double xfinal[tempsize], yfinal[tempsize];
for(j=0; j<tempsize;j++){
xfinal[j] = xtemp[j]/ztemp[j];
yfinal[j] = ytemp[j]/ztemp[j];
xfinal[j] = (xfinal[j] * (300/tan(halfAngle))) + 300;
yfinal[j] = (yfinal[j] * (300/tan(halfAngle))) + 300;
}
D3d_x_product(perpendicular,first,second);
double length = sqrt(perpendicular[0]*perpendicular[0] + perpendicular[1]*perpendicular[1] + perpendicular[2]*perpendicular[2]);
perpendicular[0] = perpendicular[0]/length;
perpendicular[1] = perpendicular[1]/length;
perpendicular[2] = perpendicular[2]/length;
double lightLength = sqrt(light[0]*light[0] + light[1]*light[1] + light[2]*light[2]);
light[0] = light[0]/lightLength;
light[1] = light[1]/lightLength;
light[2] = light[2]/lightLength;
double eyelength = sqrt(eye[0]*eye[0] + eye[1]*eye[1] + eye[2]*eye[2]);
eye[0] = eye[0]/eyelength;
eye[1] = eye[1]/eyelength;
eye[2] = eye[2]/eyelength;
double pl = dot_product(perpendicular, light);
if(pl < 0){
perpendicular[0] = -1 * perpendicular[0];
perpendicular[1] = -1 * perpendicular[1];
perpendicular[2] = -1 * perpendicular[2];
pl = dot_product(perpendicular, light);
}
double pe = dot_product(perpendicular, eye);
double intensity;
if (pe < 0) { intensity = ambient ; goto JJJ ; }
double diffuse = diffusepro * pl;
reflection[0] = ((2 * pl) * perpendicular[0]) - light[0];
reflection[1] = ((2 * pl) * perpendicular[1]) - light[1];
reflection[2] = ((2 * pl) * perpendicular[2]) - light[2];
double specular;
specular = (1 - ambient - diffusepro) * pow((dot_product(eye, reflection)),specpow);
intensity = ambient + diffuse + specular;
JJJ : ;
double redt, greent, bluet;
if(intensity <= ambient + diffusepro){
double f = intensity/ (ambient + diffusepro);
redt = f*red[polyLoc[n].objnum];
greent = f* green[polyLoc[n].objnum];
bluet = f*blue[polyLoc[n].objnum];
}
else{
double I[3];
I[0] = 1-red[polyLoc[n].objnum];
I[1] = 1-green[polyLoc[n].objnum];
I[2] = 1-blue[polyLoc[n].objnum];
double f = (intensity - ambient - diffusepro)/ (1 - ambient - diffusepro);
redt = f*I[0] + red[polyLoc[n].objnum];
greent = f*I[1] + green[polyLoc[n].objnum];
bluet = f*I[2] + blue[polyLoc[n].objnum];
}
G_rgb(redt,greent,bluet);
G_fill_polygon(xfinal, yfinal, tempsize);
G_rgb(0,0,0);
G_polygon(xfinal, yfinal, tempsize);
}
}
int main()
{
double swidth, sheight ;
double lowleftx, lowlefty, width, height ;
double x[10],y[10] ;
double numpoints,q, x0,y0,x1,y1 ;
double p[2] ;
// must do this before you do 'almost' any other
// graphical tasks
swidth = 400 ; sheight = 400 ;
G_init_graphics (swidth, sheight) ;
// draw a point, a line, some rectangles, some triangles
G_rgb(1, 0, 0) ; // red
G_point(200, 380) ;
G_rgb(0, 1, 0) ; // green
// G_line (0, 0, 400, 400) ; // won't show if part is off screen
G_line (0, 0, 399, 399) ;
G_rgb(0, 0, 1) ; // blue
lowleftx = 200 ; lowlefty = 50 ; width = 10 ; height = 30 ;
G_rectangle (lowleftx, lowlefty, width, height) ;
lowleftx = 250 ;
G_fill_rectangle (lowleftx, lowlefty, width, height) ;
G_rgb(1, 1, 0) ; // yellow
G_triangle (10, 300, 40,300, 60,250) ;
G_fill_triangle (10,100, 40,100, 60,150) ;
G_rgb(1, 0.5, 0) ; // orange
G_circle (100, 300, 75) ;
G_fill_circle (370, 200, 50) ;
// prints text in your graphics window
G_rgb(0, 0, 0) ; // black
G_draw_string ("hello",300,100) ;
// draw a polygon
x[0] = 100 ; y[0] = 100 ;
x[1] = 100 ; y[1] = 300 ;
x[2] = 300 ; y[2] = 300 ;
x[3] = 300 ; y[3] = 100 ;
x[4] = 200 ; y[4] = 175 ;
numpoints = 5 ;
G_polygon (x,y,numpoints) ;
q = G_wait_key() ; // pause to look ...any key to continue
G_rgb (0.4, 0.2, 0.1) ; // brown
G_fill_polygon (x,y,numpoints) ;
G_rgb (0.5, 0.8, 0.4) ;// what color is this?
G_wait_click(p) ; // wait for a mouse click
x0 = p[0] ; y0 = p[1] ; // extract coordinates
G_fill_rectangle (x0-2, y0-2, 4,4) ;// mark the clicked point
G_wait_click(p) ;
x1 = p[0] ; y1 = p[1] ;
G_fill_rectangle (x1-2, y1-2, 4,4) ;
G_rgb (0.5, 0.5, 0.5) ; // a grey
G_line (x0,y0, x1,y1) ;
q = G_wait_key() ; // pause again before exit
G_save_image_to_file ("t01c.xwd") ;
G_close() ; // terminate graphics...probably not fatal if forgotten
}
int main()
{
int swidth, sheight ;
double lowleftx, lowlefty, width, height ;
double x[10],y[10] ;
double numpoints,q, x0,y0,x1,y1 ;
double p[2] ;
int i ;
// must do this before you do 'almost' any other
// graphical tasks
swidth = 400 ; sheight = 500 ;
G_init_graphics (swidth, sheight) ;
// draw a point, a line, some rectangles, some triangles
G_rgb(1, 0, 0) ; // red
G_point(200, 380) ;
G_fill_rectangle (300,400, 50, 20) ;
G_rgb(0, 1, 0) ; // green
// G_line (0, 0, 400, 400) ; // won't show if part is off screen
G_line (0, 0, 399, 399) ;
G_fill_triangle(50, 400, 100,400, 150,475) ;
G_rgb(0, 0, 1) ; // blue
lowleftx = 200 ; lowlefty = 50 ; width = 10 ; height = 30 ;
G_rectangle (lowleftx, lowlefty, width, height) ;
lowleftx = 250 ;
G_fill_rectangle (lowleftx, lowlefty, width, height) ;
G_rgb(1, 1, 0) ; // yellow
G_triangle (10, 300, 40,300, 60,250) ;
G_fill_triangle (10,100, 40,100, 60,150) ;
G_rgb(1, 0.5, 0) ; // orange
G_circle (100, 300, 75) ;
G_fill_circle (370, 200, 50) ;
// prints text in your graphics window
G_rgb(0, 0, 0) ; // black
G_draw_string ("hello",300,100) ;
// draw a polygon
x[0] = 100 ; y[0] = 100 ;
x[1] = 100 ; y[1] = 300 ;
x[2] = 300 ; y[2] = 300 ;
x[3] = 300 ; y[3] = 100 ;
x[4] = 200 ; y[4] = 175 ;
numpoints = 5 ;
G_polygon (x,y,numpoints) ;
G_rgb (0.4, 0.2, 0.1) ; // brown
G_fill_polygon (x,y,numpoints) ;
G_rgb (0.5, 0.8, 0.4) ;// what color is this?
int xc,yc ;
int pixel ;
int rgbI[3] ;
double rgb[3] ;
G_wait_click(p) ;
xc = p[0] ; yc = p[1] ;
while (yc > 20) {
printf("%d %d\n",xc,yc) ;
pixel = G_get_pixel(xc,yc) ;
G_convert_pixel_to_rgbI(pixel, rgbI) ;
G_convert_rgbI_to_rgb(rgbI, rgb) ;
printf("pixel = %x\n",pixel) ;
printf("%3d %3d %3d\n",rgbI[0],rgbI[1],rgbI[2]) ;
printf("%lf %lf %lf\n",rgb[0],rgb[1],rgb[2]) ;
printf("\n") ;
G_wait_click(p) ;
xc = p[0] ; yc = p[1] ;
}
}