int main(int argc, char *argv[]) {
const int rows = 180;
const int cols = 320;
const int nFrames = 100;
View3D view;
Matrix vtm;
Polygon side[6];
Polygon tpoly;
Point tv[4];
Point v[8];
Color color[6];
Image *src;
int i, t;
char filename[256];
// set some colors
color_set( &color[0], 0, 0, 1 );
color_set( &color[1], 0, 1, 0 );
color_set( &color[2], 1, 0, 0 );
color_set( &color[3], 1, 0, 1 );
color_set( &color[4], 0, 1, 1 );
color_set( &color[5], 1, 1, 0 );
for(t=0;t<nFrames;t++) {
// initialize polygons
for(i=0;i<6;i++) {
polygon_init( &side[i] );
}
// corners of a cube, centered at (0, 0, 0)
point_set1( &v[0], -1, -1, -1 );
point_set1( &v[1], 1, -1, -1 );
point_set1( &v[2], 1, 1, -1 );
point_set1( &v[3], -1, 1, -1 );
point_set1( &v[4], -1, -1, 1 );
point_set1( &v[5], 1, -1, 1 );
point_set1( &v[6], 1, 1, 1 );
point_set1( &v[7], -1, 1, 1 );
// front side
polygon_set( &side[0], 4, &(v[0]) );
// back side
polygon_set( &side[1], 4, &(v[4]) );
// top side
point_copy( &tv[0], &v[2] );
point_copy( &tv[1], &v[3] );
point_copy( &tv[2], &v[7] );
point_copy( &tv[3], &v[6] );
polygon_set( &side[2], 4, tv );
// bottom side
point_copy( &tv[0], &v[0] );
point_copy( &tv[1], &v[1] );
point_copy( &tv[2], &v[5] );
point_copy( &tv[3], &v[4] );
polygon_set( &side[3], 4, tv );
// left side
point_copy( &tv[0], &v[0] );
point_copy( &tv[1], &v[3] );
point_copy( &tv[2], &v[7] );
point_copy( &tv[3], &v[4] );
polygon_set( &side[4], 4, tv );
// right side
point_copy( &tv[0], &v[1] );
point_copy( &tv[1], &v[2] );
point_copy( &tv[2], &v[6] );
point_copy( &tv[3], &v[5] );
polygon_set( &side[5], 4, tv );
// grab command line argument to determine viewpoint
// and set up the view structure
/*if( argc > 1 ) {
float alpha = atof( argv[1] );
if( alpha < 0.0 || alpha > 1.0 )
alpha = 0.0;
point_set1( &(view.vrp), 3*alpha, 2*alpha, -2*alpha - (1.0-alpha)*3 );
}
else {
point_set1( &(view.vrp), 3, 2, -2 );
} */
float alpha = abs(t - (0.5*nFrames)) / (0.5*nFrames);
point_set1( &(view.vrp), 3*alpha, 2*alpha, -2*alpha - (1.0-alpha)*3 );
vector_set( &(view.vpn), -view.vrp.val[0], -view.vrp.val[1], -view.vrp.val[2] );
vector_set( &(view.vup), 0, 1, 0 );
view.d = 1; // focal length
view.du = 2;
view.dv = view.du * (float)rows / cols;
view.f = 0; // front clip plane
view.b = 4; // back clip plane
view.screenx = cols;
view.screeny = rows;
matrix_setView3D( &vtm, &view );
// create image
src = image_create( rows, cols );
// use a temprary polygon to transform stuff
polygon_init( &tpoly );
//printf("Drawing Polygons\n");
for(i=0;i<6;i++) {
polygon_copy( &tpoly, &side[i] );
matrix_xformPolygon( &vtm, &tpoly );
// normalize by homogeneous coordinate before drawing
polygon_normalize( &tpoly );
polygon_draw( &tpoly, src, color[i] );
//polygon_print( &tpoly, stdout );
}
sprintf(filename, "frame-%04d.ppm", t );
image_write( src, filename );
/*printf("Writing image\n");
image_write( src, "cube.ppm" );*/
}
system("convert frame-*.ppm cube.gif");
system("rm frame-*.ppm");
return(0);
}
int main(int argc, char *argv[]) {
const int rows = 1000;
const int cols = 1000;
View3D view;
Matrix vtm;
Polygon side[4];
Polygon tpoly;
Point tv[3];
Point v[4];
Color color[4];
Image *src;
char filename[100];
double x;
int i;
// set some colors
Color_set( &color[0], 0, 0, 1 );
Color_set( &color[1], 0, 1, 0 );
Color_set( &color[2], 1, 0, 0 );
Color_set( &color[3], 1, 0, 1 );
// initialize polygons
for(i=0;i<4;i++) {
polygon_init( &side[i] );
}
// corners of a cube, centered at (0, 0, 0)
point_set3D( &v[0], 0, 1, 0 );
point_set3D( &v[1], 1, -1, 0);
point_set3D( &v[2], -1, -1, 0 );
point_set3D( &v[3], 0, 0, 1 );
//base of the pyramid
polygon_set(&side[3], 3, &(v[0]));
//side1
point_copy(&tv[0], &v[0]);
point_copy(&tv[1], &v[2]);
point_copy(&tv[2], &v[3]);
polygon_set(&side[0], 3, tv);
//side2
point_copy(&tv[0], &v[0]);
point_copy(&tv[1], &v[1]);
point_copy(&tv[2], &v[3]);
polygon_set(&side[1], 3, tv);
//side3
point_copy(&tv[0], &v[1]);
point_copy(&tv[1], &v[2]);
point_copy(&tv[2], &v[3]);
polygon_set(&side[2], 3, tv);
point_set3D( &(view.vrp), 1, 0, 0);
vector_set( &(view.vpn), -view.vrp.val[0], -view.vrp.val[1], -view.vrp.val[2] );
vector_set( &(view.vup), 0, 0, 1 );
view.d = 1; // focal length
view.du = 2;
view.dv = view.du * (float)rows / cols;
view.f = 0; // front clip plane
view.b = 4; // back clip plane
view.screenx = cols;
view.screeny = rows;
matrix_setView3D( &vtm, &view );
// use a temprary polygon to transform stuff
polygon_init( &tpoly );
printf("Drawing pyramid\n");
x = -2;
int j;
for (j=0; j<50; j++){
// create image
src = image_create( rows, cols );
point_set3D(&(view.vrp), x , 2, 0.5);
vector_set( &(view.vpn), -x, -2, -0.5);
matrix_setView3D(&vtm, &view);
i=0;
for(i=0;i<4;i++) {
polygon_copy( &tpoly, &side[i] );
matrix_xformPolygon( &vtm, &tpoly );
// normalize by homogeneous coordinate before drawing
polygon_normalize( &tpoly );
polygon_draw( &tpoly, src, color[i] );
//polygon_print( &tpoly, stdout );
}
printf("Writing image\n");
sprintf(filename, "pyramid_%04d.ppm", j);
image_write( src, filename);
free(src);
if(j<25){
x += 0.08;
}else{
x -= 0.08;
}
}
printf("Making the .gif file...\n");
system("convert -delay 10 pyramid_*.ppm ../images/ext1.gif");
system("rm -f pyramid*");
return(0);
}
/*
* Draw the module into the image using the given view transformation matrix [VTM],
* Lighting and DrawState by traversing the list of Elements.
* (For now, Lighting can be an empty structure.)
*/
void module_draw(Module *md, Matrix *VTM, Matrix *GTM, DrawState *ds,
Lighting *lighting, Image *src){
/* for antialiasing
Module *thickLineMod = module_create();
Element *thickLineE;
float dx, dy, dz, lineLength;
Vector u, v, w;*/
// all locally needed variables
Matrix LTM, tempGTM;
Line tempLine;
DrawState *tempds = drawstate_create();
Point tempPointLTM, tempPointGTM, tempPointVTM;
Polyline *tempPolyline = polyline_create();
Polygon *tempPolygon = polygon_create();
Element *e = md->head;
matrix_identity(<M);
// loop until the end of the linked list is reached
while(e){
//printf("Handling type %d\n", e->type);
// draw based on type
switch(e->type){
case ObjNone:
break;
case ObjPoint:
//printf("drawing point ");
// copy, xform, normalize, draw
matrix_xformPoint(<M, &(e->obj.point), &tempPointLTM);
matrix_xformPoint(GTM, &tempPointLTM, &tempPointGTM);
matrix_xformPoint(VTM, &tempPointGTM, &tempPointVTM);
point_normalize(&(tempPointVTM));
//point_print(&tempPointVTM, stdout);
point_draw(&tempPointVTM, src, ds->color);
break;
case ObjLine:
line_copy(&tempLine, &(e->obj.line));
//printf("drawing line ");
// copy, xform, normalize, draw
matrix_xformLine(<M, &tempLine);
matrix_xformLine(GTM, &tempLine);
matrix_xformLine(VTM, &tempLine);
line_normalize(&tempLine);
line_draw(&tempLine, src, ds->color);
//line_print(&tempLine, stdout);
/*if(antialias){
dx = tempLine.b.val[0]-tempLine.a.val[0];
dy = tempLine.b.val[1]-tempLine.a.val[1];
dz = tempLine.b.val[2]-tempLine.a.val[2];
lineLength = sqrt(dx*dx+dy*dy+dz*dz);
module_scale( thickLineMod, 1, lineLength, 1 );
vector_set(&v, dx, dy, dz);
vector_normalize(&v);
vector_set(&u, -dz, dx, dy);
vector_cross(&u, &v, &w);
vector_cross(&v, &w, &u);
vector_normalize(&u);
vector_normalize(&w);
module_rotateXYZ( thickLineMod, &u, &v, &w );
module_translate( thickLineMod, tempLine.a.val[0],
tempLine.a.val[1],
tempLine.a.val[2] );
module_cylinder( thickLineMod, 4, 1, 1, 0, 0, 0 );
thickLineE = element_init(ObjModule, thickLineMod);
thickLineE->next = e->next;
e->next = thickLineE;
}*/
break;
case ObjPolyline:
//printf("drawing polyline ");
// copy, xform, normalize, draw
polyline_copy(tempPolyline, &(e->obj.polyline));
matrix_xformPolyline(<M, tempPolyline);
matrix_xformPolyline(GTM, tempPolyline);
matrix_xformPolyline(VTM, tempPolyline);
polyline_normalize(tempPolyline);
//polyline_print(tempPolyline, stdout);
polyline_draw(tempPolyline, src, ds->color);
break;
case ObjPolygon:
//printf("drawing polygon ");
// copy, xform, normalize, draw
polygon_copy(tempPolygon, &(e->obj.polygon));
matrix_xformPolygon(<M, tempPolygon);
matrix_xformPolygon(GTM, tempPolygon);
matrix_xformPolygon(VTM, tempPolygon);
polygon_normalize(tempPolygon);
//polygon_print(tempPolygon, stdout);
polygon_draw(tempPolygon, src, ds);
break;
case ObjColor:
drawstate_setColor(ds, e->obj.color);
break;
case ObjBodyColor:
break;
case ObjSurfaceColor:
break;
case ObjSurfaceCoeff:
break;
case ObjLight:
break;
case ObjIdentity:
matrix_identity(<M);
break;
case ObjMatrix:
matrix_multiply(&(e->obj.matrix), <M, <M);
break;
case ObjModule:
matrix_multiply(GTM, <M, &tempGTM);
drawstate_copy(tempds, ds);
module_draw(e->obj.module, VTM, &tempGTM, tempds, lighting, src);
break;
default:
printf("ObjectType %d is not handled in module_draw\n",e->type);
}
// advance traversal
e = e->next;
}
// clean up
polygon_free(tempPolygon);
polyline_free(tempPolyline);
free(tempds);
}
