Root/solidify/project.c

Source at commit f6ed3bf762b63b950cf801c9282101a818c0ff8e created 8 years 8 months ago.
By Werner Almesberger, solidify now stores the context of sessions in project description files.
1/*
2 * project.c - Load and save solidify project descriptions
3 *
4 * Written 2010 by Werner Almesberger
5 * Copyright 2010 by Werner Almesberger
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13
14#include <stdlib.h>
15#include <stdio.h>
16#include <string.h>
17#include <errno.h>
18#include <math.h>
19
20#include "util.h"
21#include "face.h"
22#include "solid.h"
23#include "project.h"
24
25
26static struct project *make_project(const char *name,
27    const char *top, const char *bottom, double dist_mm)
28{
29    struct project *prj;
30
31    prj = alloc_type(struct project);
32    prj->name = stralloc(name);
33    prj->top = stralloc(top);
34    prj->bottom = stralloc(bottom);
35    prj->s.a = read_face(top);
36    prj->s.b = read_face(bottom);
37
38    if (prj->s.a->x_step != prj->s.a->x_step ||
39        prj->s.a->y_step != prj->s.a->y_step ||
40        prj->s.a->z_step != prj->s.a->z_step) {
41        fprintf(stderr, "both faces must have the same resolution\n");
42        exit(1);
43        }
44
45    prj->s.dist = dist_mm/prj->s.a->z_step;
46    return prj;
47}
48
49
50struct project *new_project(const char *name,
51    const char *top, const char *bottom, double dist_mm)
52{
53    FILE *file;
54
55    file = fopen(name, "r");
56    if (file) {
57        fprintf(stderr, "%s: already exists\n", name);
58        exit(1);
59    }
60    return make_project(name, top, bottom, dist_mm);
61}
62
63
64static void read_face_data(FILE *file, struct face *f)
65{
66    float v;
67
68    if (fscanf(file, "%f", &v) != 1)
69        return;
70    f->z_ref = v/f->z_step;
71
72    if (fscanf(file, "%f", &v) != 1)
73        return;
74    f->fx = sin(v/180*M_PI);
75
76    if (fscanf(file, "%f", &v) != 1)
77        return;
78    f->fy = sin(v/180*M_PI);
79
80    if (fscanf(file, "%f", &v) != 1)
81        return;
82    v = v/180*M_PI;
83    f->m.a[0][0] = cos(v);
84    f->m.a[0][1] = -sin(v);
85    f->m.a[1][0] = sin(v);
86    f->m.a[1][1] = cos(v);
87
88    if (fscanf(file, "%f", &v) != 1)
89        return;
90    f->m.b[0] = v/f->x_step;
91    
92    if (fscanf(file, "%f", &v) != 1)
93        return;
94    f->m.b[1] = v/f->y_step;
95}
96
97
98static void read_optional(FILE *file, struct project *prj)
99{
100    float v;
101
102    if (fscanf(file, "%f", &v) != 1)
103        return;
104    prj->s.dist = v/prj->s.a->z_step;
105
106    read_face_data(file, prj->s.a);
107    read_face_data(file, prj->s.b);
108}
109
110
111struct project *load_project(const char *name)
112{
113    FILE *file;
114    char top[1000], bottom[1000]; /* @@@ enough */
115    struct project *prj;
116
117    file = fopen(name, "r");
118    if (!file) {
119        perror(name);
120        exit(1);
121    }
122
123    if (!fgets(top, sizeof(top), file)) {
124        fprintf(stderr, "%s: can't read name of top face\n", name);
125        exit(1);
126    }
127    if (strchr(top, '\n'))
128        *strchr(top, '\n') = 0;
129
130    if (!fgets(bottom, sizeof(bottom), file)) {
131        fprintf(stderr, "%s: can't read name of bottom face\n",
132            bottom);
133        exit(1);
134    }
135    if (strchr(bottom, '\n'))
136        *strchr(bottom, '\n') = 0;
137
138    prj = make_project(name, top, bottom, 0);
139
140    read_optional(file, prj);
141
142    return prj;
143}
144
145
146static void save_face_data(FILE *file, const char *name, const struct face *f)
147{
148    double a;
149
150    a = asin(-f->m.a[0][1])/M_PI*180;
151    if (f->m.a[0][0] < 0)
152        a = 180-a;
153    if (fprintf(file, "%g %g %g\n%g %g %g\n",
154        f->z_ref*f->z_step,
155        asin(f->fx)/M_PI*180, asin(f->fy)/M_PI*180,
156        a, f->m.b[0]*f->x_step, f->m.b[1]*f->y_step) < 0) {
157        perror(name);
158        exit(1);
159    }
160}
161
162
163void save_project(const struct project *prj)
164{
165    char tmp[1000]; /* @@@ enough */
166    FILE *file;
167
168    sprintf(tmp, "%s~", prj->name);
169    file = fopen(tmp, "w");
170    if (!file) {
171        perror(tmp);
172        exit(1);
173    }
174    if (fprintf(file,
175        "%s\n%s\n%g\n", prj->top, prj->bottom,
176        prj->s.dist*prj->s.a->z_step) < 0) {
177        perror(tmp);
178        exit(1);
179    }
180    save_face_data(file, tmp, prj->s.a);
181    save_face_data(file, tmp, prj->s.b);
182    if (fclose(file) < 0) {
183        perror(tmp);
184        exit(1);
185    }
186
187    if (rename(tmp, prj->name) < 0) {
188        fprintf(stderr, "rename %s to %s: %s\n", tmp, prj->name,
189            strerror(errno));
190        exit(1);
191    }
192}
193

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