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svg output is getting closer

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This commit is contained in:
Trammell Hudson 2014-12-14 12:21:18 -05:00
parent 2881e65d18
commit 13f69b663f
1 changed files with 50 additions and 52 deletions
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102
unfold.c
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@ -8,6 +8,10 @@
#include <unistd.h>
#include <math.h>
#ifndef M_PI
#define M_PI 3.1415926535897932384
#endif
#define EPS 0.0001
typedef struct
@ -152,16 +156,58 @@ recurse(
// print out a svg group for this triangle, starting with
// the incoming edge
printf("%p %d %f %f %f\n", f, start_edge, f->sides[0], f->sides[1], f->sides[2]);
float a = f->sides[(start_edge + 0) % 3];
float c = f->sides[(start_edge + 1) % 3];
float b = f->sides[(start_edge + 2) % 3];
float x2 = (a*a + b*b - c*c) / (2*a);
float y2 = sqrt(b*b - x2*x2);
printf("<polyline points=\"0,0 %f,0 %f,%f\ 0,0\" fill=\"none\" stroke=\"#FF0000\" />\n",
a,
x2,
y2
);
//printf("%p %d %f %f %f\n", f, start_edge, f->sides[0], f->sides[1], f->sides[2]);
// for each edge, find the triangle that matches
for (int edge = 0 ; edge < 3 ; edge++)
{
face_t * const f2 = f->next[edge];
face_t * const f2 = f->next[(edge+start_edge) % 3];
if (f2->used)
continue;
// create a group that translates and rotates
// such that it lines up with this edge
float trans_x, trans_y, rotate;
if (edge == 0)
{
trans_x = a;
trans_y = 0;
rotate = 180;
} else
if (edge == 1)
{
trans_x = x2;
trans_y = y2;
rotate = atan2(y2, a-x2) * 180 / M_PI;
} else
if (edge == 2)
{
trans_x = 0;
trans_y = 0;
rotate = atan2(y2, x2) * 180 / M_PI;
}
printf("<!-- edge %d --><g transform=\"translate(%f,%f) rotate(%f)\">\n",
edge,
trans_x,
trans_y,
rotate
);
recurse(f2, f->next_edge[edge]);
printf("</g>\n");
}
// no success
@ -258,59 +304,11 @@ int main(void)
// we now have a graph that shows the connection between
// all of the faces and their sizes. start converting them
printf("<svg xmlns=\"http://www.w3.org/2000/svg\">\n");
//for (int i = 0 ; i < num_triangles ; i++)
recurse(&faces[0], 0);
#if 0
// worst case -- all separate polygons
poly_t * const polys = calloc(num_triangles, sizeof(*polys));
v3_t * const vertices = calloc(num_triangles*3, sizeof(*vertices));
int num_vertices = 0;
for(int i = 0 ; i < num_triangles ; i++)
{
// see if this matches an existing vertex
const stl_face_t * const t = &faces[i];
poly_t * const p = &polys[i];
p->n = 3;
p->p[0] = p->p[1] = p->p[2] = -1;
for (int j = 0 ; j < num_vertices ; j++)
{
const v3_t * const v = &vertices[j];
if (p->p[0] == -1 && v3_eq(v, &t->p0))
p->p[1] = j;
if (p->p[1] == -1 && v3_eq(v, &t->p1))
p->p[1] = j;
if (p->p[2] == -1 && v3_eq(v, &t->p2))
p->p[2] = j;
// check if we've found all of them
if (p->p[0] >= 0 && p->p[1] >= 0 && p->p[2] >= 0)
break;
}
// create new points if we haven't found matches
if (p->p[0] < 0)
{
p->p[0] = num_vertices;
vertices[num_vertices++] = t->p0;
}
if (p->p[1] < 0)
{
p->p[1] = num_vertices;
vertices[num_vertices++] = t->p1;
}
if (p->p[3] < 0)
{
p->p[3] = num_vertices;
vertices[num_vertices++] = t->p2;
}
}
fprintf(stderr, "unique vertices: %d\n", num_vertices);
#endif
printf("</svg>\n");
return 0;
}