papercraft/faces.c

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C
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/** \file
* Generate an svg file with the polygonal faces.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <unistd.h>
#include <math.h>
#include <err.h>
#include <assert.h>
#include "v3.h"
#include "stl_3d.h"
static const char * stroke_string
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= "stroke-width=\"0.1px\" fill=\"none\"";
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static void
svg_line(
const refframe_t * const ref,
const v3_t p1,
const v3_t p2
)
{
// project p1 and p2 into the plane
double x1, y1, x2, y2;
v3_project(ref, p1, &x1, &y1);
v3_project(ref, p2, &x2, &y2);
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const char * color = "#FF0000";
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printf("<line x1=\"%f\" y1=\"%f\" x2=\"%f\" y2=\"%f\" stroke=\"%s\" %s/>\n",
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x1, y1,
x2, y2,
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color,
stroke_string
);
}
static void
svg_circle(
const double x,
const double y,
const double rad,
const char * const color
)
{
printf("<circle cx=\"%f\" cy=\"%f\" r=\"%f\" stroke=\"%s\" %s/>\n",
x,
y,
rad,
color,
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stroke_string
);
}
int
main(void)
{
stl_3d_t * const stl = stl_3d_parse(STDIN_FILENO);
if (!stl)
return EXIT_FAILURE;
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const double inset_distance = 6;
const double hole_radius = 3.0/2;
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int * const face_used = calloc(sizeof(*face_used), stl->num_face);
// for each vertex, find the coplanar triangles
// \todo: do coplanar bits
printf("<svg xmlns=\"http://www.w3.org/2000/svg\">\n");
printf("<g transform=\"scale(3.543307)\"><!-- scale to mm -->\n");
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const stl_vertex_t ** const vertex_list = calloc(sizeof(*vertex_list), stl->num_vertex);
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for(int i = 0 ; i < stl->num_face ; i++)
{
if (face_used[i])
continue;
const stl_face_t * const f = &stl->face[i];
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const int vertex_count = stl_trace_face(
stl,
f,
vertex_list,
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face_used,
0
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);
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fprintf(stderr, "%d: %d vertices\n", i, vertex_count);
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// generate a refernce frame based on this face
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refframe_t ref;
refframe_init(&ref,
f->vertex[0]->p,
f->vertex[1]->p,
f->vertex[2]->p
);
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printf("<!-- face %d --><g>\n", i);
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// generate the polygon outline (should be one path?)
for (int j = 0 ; j < vertex_count ; j++)
svg_line(
&ref,
vertex_list[(j+0) % vertex_count]->p,
vertex_list[(j+1) % vertex_count]->p
);
// generate the inset mounting holes
for (int j = 0 ; j < vertex_count ; j++)
{
double x, y;
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refframe_inset(&ref, inset_distance, &x, &y,
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vertex_list[(j+0) % vertex_count]->p,
vertex_list[(j+1) % vertex_count]->p,
vertex_list[(j+2) % vertex_count]->p
);
svg_circle(x, y, hole_radius, "#00ff00");
}
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printf("</g>\n");
}
printf("</g></svg>\n");
return 0;
}