extern domain_t* cf_domain(double w, double h)
{
bbox_t b = {{-w/2, w/2},
{-h/2, h/2}};
vector_t v = {0, 0};
polyline_t p1, p2;
double R = w/10.0;
if ((polyline_rect(b, &p1) != 0) || (polyline_ngon(R, v, 32, &p2) != 0))
return NULL;
domain_t* dom;
dom = domain_insert(NULL, &p1);
dom = domain_insert(dom, &p2);
polyline_clear(&p1);
polyline_clear(&p2);
if (domain_orientate(dom) != 0)
{
domain_destroy(dom);
return NULL;
}
return dom;
}
extern domain_t* cylf_domain(cylf_t cylf)
{
bbox_t b = {{-1, 1}, {-1, 1}};
vector_t v = {cylf.x, cylf.y};
polyline_t p1, p2;
if ((polyline_rect(b, &p1) != 0) ||
(polyline_ngon(cylf.radius, v, 32, &p2) != 0))
return NULL;
domain_t* dom;
dom = domain_insert(NULL, &p1);
dom = domain_insert(dom, &p2);
polyline_clear(&p1);
polyline_clear(&p2);
if (domain_orientate(dom) != 0)
{
domain_destroy(dom);
return NULL;
}
return dom;
}
/*
De-allocates/allocates space as necessary in the destination Polyline data structure and copies the
vertex data from the source polyline (from) to the destination (to).
*/
void polyline_copy(Polyline *to, Polyline *from){
if(NULL != to && NULL != from){
polyline_clear(to);
to->vertex = malloc(sizeof(Point)*from->numVertex);
int i;
for (i=0; i < from->numVertex; i++)
{
to->vertex[i] = from->vertex[i];
}
to->numVertex = from->numVertex;
to->zBuffer = from->zBuffer;
}
}
/*
* free the element and the object it contains, as appropriate.
*/
void element_delete(Element *e){
if(!e){
printf("Null e passed to element_delete\n");
return;
}
//printf("deleting element of type %d\n", e->type);
switch(e->type){
case ObjPolyline:
polyline_clear(&(e->obj.polyline));
break;
case ObjPolygon:
polygon_clear(&(e->obj.polygon));
break;
default:
//printf("ObjectType %d is not handled in element_delete\n",e->type);
break;
}
free(e);
}
// draw some random lines, then two boxes
int main(int argc, char *argv[]) {
const int nPoints = 1000;
Polyline thing1;
Polyline *thing2;
Point p[nPoints];
int i;
int rows = 500;
int cols = 500;
Image *src;
Color Blue;
Color Red;
Color Green;
Color_set( &Blue, 0.1, 0.15, 0.7 );
Color_set( &Red, 0.8, 0.2, 0.1 );
Color_set( &Green, 0.2, 0.6, 0.2 );
printf("Startup\n");
for(i=0;i<nPoints;i++) {
point_set2D( &(p[i]), drand48()*cols/2, drand48()*rows/2 );
}
// init is necessary, because otherwise the fields are full of garbage
printf("Polyline init and set\n");
polyline_init( &thing1 );
polyline_set( &thing1, 20, &( p[42] ) );
printf("Polyline create\n");
thing2 = polyline_createp( 10, &(p[105] ) );
printf("Creating image\n");
src = image_create( rows, cols );
printf("Drawing poly-lines\n");
// draw some random lines
polyline_draw( &thing1, src, Blue );
polyline_draw( thing2, src, Red );
// draw a box going counter-clockwise, should be ok
point_set2D( &(p[500]), 50, 300 );
point_set2D( &(p[501]), 50, 350 );
point_set2D( &(p[502]), 100, 350 );
point_set2D( &(p[503]), 100, 300 );
point_set2D( &(p[504]), 50, 300 );
printf("Counter-clockwise box\n");
polyline_set( thing2, 5, &(p[500]) );
polyline_draw( thing2, src, Green );
// draw a box going clockwise, should not be ok
point_set2D( &(p[500]), 350, 300 );
point_set2D( &(p[501]), 400, 300 );
point_set2D( &(p[502]), 400, 350 );
point_set2D( &(p[503]), 350, 350 );
point_set2D( &(p[504]), 350, 300 );
printf("Clockwise box\n");
polyline_set( thing2, 5, &(p[500]) );
polyline_draw( thing2, src, Green );
image_write( src, "test3c.ppm");
printf("Cleanup\n");
polyline_clear( &thing1 );
printf("clear\n");
polyline_free( thing2 );
printf("free\n");
image_free( src );
return(0);
}