src/cpml/tests/test-arc.c

   1 /* ADG - Automatic Drawing Generation
   2  * Copyright (C) 2007-2019  Nicola Fontana <ntd at entidi.it>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301, USA.
  18  */
  19
  20
  21 #include <adg-test.h>
  22 #include <cpml.h>
  23 #include <math.h>
  24
  25
  26 static cairo_path_data_t arc_data[] = {
  27     { .header = { CPML_MOVE, 2 }},
  28     { .point = { 0, 3 }},
  29
  30     { .header = { CPML_ARC, 3 }},
  31     { .point = { 3, 0 }},
  32     { .point = { 0, -3 }}
  33 };
  34
  35 CpmlPrimitive arc = {
  36     NULL,
  37     &arc_data[1],
  38     &arc_data[2]
  39 };
  40
  41
  42 static void
  43 _cpml_sanity_info(gint i)
  44 {
  45     switch (i) {
  46     case 1:
  47         cpml_arc_info(NULL, NULL, NULL, NULL, NULL);
  48         break;
  49     default:
  50         g_test_trap_assert_failed();
  51         break;
  52     }
  53 }
  54
  55 static void
  56 _cpml_sanity_to_cairo(gint i)
  57 {
  58     cairo_t *cr;
  59
  60     cr = adg_test_cairo_context();
  61
  62     switch (i) {
  63     case 1:
  64         cpml_arc_to_cairo(NULL, cr);
  65         break;
  66     case 2:
  67         cpml_arc_to_cairo(&arc, NULL);
  68         break;
  69     default:
  70         g_test_trap_assert_failed();
  71         break;
  72     }
  73
  74     cairo_destroy(cr);
  75 }
  76
  77 static void
  78 _cpml_sanity_to_curves(int i)
  79 {
  80     CpmlSegment segment;
  81
  82     switch (i) {
  83     case 1:
  84         cpml_arc_to_curves(NULL, &segment, 1);
  85         break;
  86     case 2:
  87         cpml_arc_to_curves(&arc, NULL, 1);
  88         break;
  89     case 3:
  90         /* XXX: this generates a division by 0 but on Travis, for some reason,
  91          * that is not enough to crash the process:
  92          * https://travis-ci.org/ntd/adg/builds/189592982
  93          *
  94          * Disabling for now.
  95          */
  96         cpml_arc_to_curves(&arc, &segment, 0);
  97         break;
  98     default:
  99         g_test_trap_assert_failed();
 100         break;
 101     }
 102 }
 103
 104 static void
 105 _cpml_method_info(void)
 106 {
 107     CpmlPair center;
 108     double r, start, end;
 109
 110     /* Passing NULL to the output arguments is valid */
 111     g_assert_true(cpml_arc_info(&arc, NULL, NULL, NULL, NULL));
 112
 113     g_assert_true(cpml_arc_info(&arc, &center, &r, &start, &end));
 114
 115     adg_assert_isapprox(center.x, 0);
 116     adg_assert_isapprox(center.y, 0);
 117     adg_assert_isapprox(r, 3);
 118     adg_assert_isapprox(start, M_PI_2);
 119     adg_assert_isapprox(end, -M_PI_2);
 120 }
 121
 122 static void
 123 _cpml_method_to_curves(void)
 124 {
 125     cairo_path_data_t data[4*2];
 126     CpmlSegment segment = { NULL, data, 0 };
 127
 128     /* Approximate with a single curve */
 129     cpml_arc_to_curves(&arc, &segment, 1);
 130
 131     g_assert_cmpint(data[0].header.type, ==, CPML_CURVE);
 132     adg_assert_isapprox(data[1].point.x, 4);
 133     adg_assert_isapprox(data[1].point.y, 3);
 134     adg_assert_isapprox(data[2].point.x, 4);
 135     adg_assert_isapprox(data[2].point.y, -3);
 136     adg_assert_isapprox(data[3].point.x, 0);
 137     adg_assert_isapprox(data[3].point.y, -3);
 138
 139     /* Approximate with two curves */
 140     cpml_arc_to_curves(&arc, &segment, 2);
 141
 142     g_assert_cmpint(data[0].header.type, ==, CPML_CURVE);
 143     adg_assert_isapprox(data[1].point.x, 1.65685425);
 144     adg_assert_isapprox(data[1].point.y, 3);
 145     adg_assert_isapprox(data[2].point.x, 3);
 146     adg_assert_isapprox(data[2].point.y, 1.65685425);
 147     adg_assert_isapprox(data[3].point.x, 3);
 148     adg_assert_isapprox(data[3].point.y, 0);
 149
 150     g_assert_cmpint(data[4].header.type, ==, CPML_CURVE);
 151     adg_assert_isapprox(data[5].point.x, 3);
 152     adg_assert_isapprox(data[5].point.y, -1.65685425);
 153     adg_assert_isapprox(data[6].point.x, 1.65685425);
 154     adg_assert_isapprox(data[6].point.y, -3);
 155     adg_assert_isapprox(data[7].point.x, 0);
 156     adg_assert_isapprox(data[7].point.y, -3);
 157 }
 158
 159
 160
 161 int
 162 main(int argc, char *argv[])
 163 {
 164     adg_test_init(&argc, &argv);
 165
 166     adg_test_add_traps("/cpml/arc/sanity/info", _cpml_sanity_info, 1);
 167     adg_test_add_traps("/cpml/arc/sanity/to-cairo", _cpml_sanity_to_cairo, 2);
 168     adg_test_add_traps("/cpml/arc/sanity/to-curves", _cpml_sanity_to_curves, 2);
 169
 170     g_test_add_func("/cpml/arc/method/info", _cpml_method_info);
 171     g_test_add_func("/cpml/arc/method/to-curves", _cpml_method_to_curves);
 172
 173     return g_test_run();
 174 }