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/**
* Creates the U.F.O. object in obv format as required by our Vlib.
* Basically a cone with 8 round "shields" (or laser beam thrower, or whatever
* they are) all around, 4 red to the right, 4 green to the left.
* Sends its output to stdout, so one has to redirect it to
* ../objects/aircraft/ufo.obv by hand.
*
* @file
* @author Umberto Salsi <salsi@icosaedro.it>
* @version $Date: 2017/10/30 02:17:57 $
*/
/*
* LINKER_OPTIONS -lm
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "../src/V/Vlibmath.h"
//#include "../src/V/VObjects.h"
// Height (ft):
#define H (20.0)
// Base radius:
#define R (1.1*H)
// Shields' radius:
#define S (0.25*H)
static int no_of_points;
static int no_of_polygons;
static char this_polygon_color[100];
static int this_polygon_no_vertices;
static char this_polygon_vertices[2000];
static char points[2000];
static char polygons[2000];
static void openPolygon(char *colors)
{
strcpy(this_polygon_color, colors);
this_polygon_no_vertices = 0;
strcpy(this_polygon_vertices, "");
}
static void addPoint(VPoint *p)
{
char s[100];
no_of_points++;
sprintf(s, "%d %.2f %.2f %.2f\n", no_of_points, p->x, p->y, p->z);
strcat(points, s);
sprintf(s, " %d", no_of_points);
strcat(this_polygon_vertices, s);
this_polygon_no_vertices++;
}
static void closePolygon()
{
char s[1000];
sprintf(s, "%s %d%s\n", this_polygon_color, this_polygon_no_vertices,
this_polygon_vertices);
strcat(polygons, s);
no_of_polygons++;
}
static void writeAll()
{
printf("%d %d\n", no_of_points, no_of_polygons);
printf("%s", points);
printf("%s", polygons);
}
int main(int argc, char** argv)
{
int i, j;
double da;
VPoint shield[6];
printf("ufo\n");
// The fuselage is a cone with vertex (0,0,-H) and base on the xy plane:
da = 2 * M_PI / 8;
for(i = 0; i < 8; i++){
openPolygon("(gray44 clip)");
addPoint(&(VPoint){R*cos(i*da+da), R*sin(i*da+da), 0});
addPoint(&(VPoint) {0, 0, -H});
addPoint(&(VPoint){R*cos(i*da), R*sin(i*da), 0});
closePolygon();
}
// Vertices of an hexagonal shield located along x:
for(i = 0; i < 6; i++){
double a = - 2 * M_PI / 6 * i;
shield[i] = (VPoint) {1.1*R, S*cos(a), S*sin(a)};
}
// Place 8 shields around the base, right red, left green:
for(i = 0; i < 8; i++){
VMatrix m;
VPoint q;
VIdentMatrix(&m);
VRotate(&m, 3, 2*M_PI/16 + i * da);
openPolygon(i < 4? "(red clip)" : "(green clip)");
for(j = 0; j < 6; j++){
VTransform(&shield[j], &m, &q);
addPoint(&q);
}
closePolygon();
}
writeAll();
return 0;
}
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