253 lines
8.4 KiB
C
253 lines
8.4 KiB
C
/*
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* Copyright © 2020 Benjamin Otte
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#include <gtk/gtk.h>
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#include <gtk/gtk.h>
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#include "gsk/gskpath.h"
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#include "gsk/gskpathbuilder.h"
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#include "gsk/gskpathmeasure.h"
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#include "gsk/gskpathpoint.h"
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static void
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test_bad_split (void)
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{
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GskPath *path, *path1;
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GskPathMeasure *measure, *measure1;
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GskPathBuilder *builder;
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float split, length, epsilon;
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/* An example that was isolated from the /path/segment test path.c
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* It shows how uneven parametrization of cubics can lead to bad
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* lengths reported by the measure.
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*/
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path = gsk_path_parse ("M 0 0 C 2 0 4 0 4 0");
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measure = gsk_path_measure_new (path);
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split = 2.962588;
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length = gsk_path_measure_get_length (measure);
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epsilon = MAX (length / 256, 1.f / 1024);
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_segment (builder, measure, 0, split);
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path1 = gsk_path_builder_free_to_path (builder);
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measure1 = gsk_path_measure_new (path1);
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g_assert_cmpfloat_with_epsilon (split, gsk_path_measure_get_length (measure1), epsilon);
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gsk_path_measure_unref (measure1);
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gsk_path_unref (path1);
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gsk_path_measure_unref (measure);
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gsk_path_unref (path);
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}
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static void
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test_bad_in_fill (void)
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{
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GskPath *path;
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GskPathMeasure *measure;
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gboolean inside;
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/* A fat Cantarell W */
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path = gsk_path_parse ("M -2 694 M 206.1748046875 704 L 390.9371337890625 704 L 551.1888427734375 99.5035400390625 L 473.0489501953125 99.5035400390625 L 649.1048583984375 704 L 828.965087890625 704 L 1028.3077392578125 10 L 857.8111572265625 10 L 710.0489501953125 621.251708984375 L 775.9720458984375 598.426513671875 L 614.5245361328125 14.0489501953125 L 430.2237548828125 14.0489501953125 L 278.6783447265625 602.230712890625 L 330.0909423828125 602.230712890625 L 195.88818359375 10 L 5.7342529296875 10 L 206.1748046875 704 Z");
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measure = gsk_path_measure_new (path);
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/* The midpoint of the right foot of a fat Cantarell X */
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inside = gsk_path_measure_in_fill (measure, &GRAPHENE_POINT_INIT (552.360107, 704.000000), GSK_FILL_RULE_WINDING);
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g_assert_false (inside);
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gsk_path_measure_unref (measure);
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gsk_path_unref (path);
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}
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static void
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test_rect (void)
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{
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GskPathBuilder *builder;
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GskPath *path;
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GskPathMeasure *measure;
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GskPathPoint *point;
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graphene_point_t p;
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graphene_vec2_t tangent, expected_tangent;
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float length;
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_rect (builder, &GRAPHENE_RECT_INIT (0, 0, 100, 50));
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path = gsk_path_builder_free_to_path (builder);
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measure = gsk_path_measure_new (path);
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length = gsk_path_measure_get_length (measure);
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g_assert_true (length == 300);
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#define TEST_POS_AT(distance, X, Y) \
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point = gsk_path_measure_get_point (measure, distance); \
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gsk_path_point_get_position (point, &p); \
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g_assert_true (graphene_point_near (&p, &GRAPHENE_POINT_INIT (X, Y), 0.01)); \
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gsk_path_point_unref (point); \
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point = gsk_path_measure_get_closest_point (measure, &GRAPHENE_POINT_INIT (X, Y), INFINITY); \
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if (distance < length) \
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g_assert_true (fabs (gsk_path_point_get_distance (point) - distance) < 0.01); \
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else \
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g_assert_true (fabs (gsk_path_point_get_distance (point)) < 0.01); \
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gsk_path_point_get_position (point, &p); \
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g_assert_true (graphene_point_near (&p, &GRAPHENE_POINT_INIT (X, Y), 0.01)); \
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gsk_path_point_unref (point);
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#define TEST_TANGENT_AT(distance, x1, y1, x2, y2) \
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point = gsk_path_measure_get_point (measure, distance); \
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gsk_path_point_get_tangent (point, GSK_PATH_START, &tangent); \
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g_assert_true (graphene_vec2_near (&tangent, graphene_vec2_init (&expected_tangent, x1, y1), 0.01)); \
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gsk_path_point_get_tangent (point, GSK_PATH_END, &tangent); \
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g_assert_true (graphene_vec2_near (&tangent, graphene_vec2_init (&expected_tangent, x2, y2), 0.01)); \
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gsk_path_point_unref (point); \
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#define TEST_POS_AT2(distance, X, Y, expected_distance) \
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point = gsk_path_measure_get_point (measure, distance); \
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gsk_path_point_get_position (point, &p); \
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g_assert_true (graphene_point_near (&p, &GRAPHENE_POINT_INIT (X, Y), 0.01)); \
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gsk_path_point_unref (point); \
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point = gsk_path_measure_get_closest_point (measure, &GRAPHENE_POINT_INIT (X, Y), INFINITY); \
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g_assert_true (fabs (gsk_path_point_get_distance (point) - expected_distance) < 0.01); \
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gsk_path_point_get_position (point, &p); \
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g_assert_true (graphene_point_near (&p, &GRAPHENE_POINT_INIT (X, Y), 0.01)); \
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gsk_path_point_unref (point);
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TEST_POS_AT (0, 0, 0)
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TEST_POS_AT (25, 25, 0)
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TEST_POS_AT (100, 100, 0)
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TEST_POS_AT (110, 100, 10)
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TEST_POS_AT (150, 100, 50)
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TEST_POS_AT (175, 75, 50)
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TEST_POS_AT (250, 0, 50)
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TEST_POS_AT (260, 0, 40)
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TEST_POS_AT (300, 0, 0)
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TEST_TANGENT_AT (0, 0, -1, 1, 0)
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TEST_TANGENT_AT (50, 1, 0, 1, 0)
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TEST_TANGENT_AT (100, 1, 0, 0, 1)
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TEST_TANGENT_AT (125, 0, 1, 0, 1)
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TEST_TANGENT_AT (150, 0, 1, -1, 0)
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TEST_TANGENT_AT (200, -1, 0, -1, 0)
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TEST_TANGENT_AT (250, -1, 0, 0, -1)
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TEST_TANGENT_AT (275, 0, -1, 0, -1)
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gsk_path_measure_unref (measure);
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gsk_path_unref (path);
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_rect (builder, &GRAPHENE_RECT_INIT (100, 50, -100, -50));
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path = gsk_path_builder_free_to_path (builder);
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measure = gsk_path_measure_new (path);
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length = gsk_path_measure_get_length (measure);
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g_assert_true (length == 300);
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TEST_POS_AT (0, 100, 50)
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TEST_POS_AT (25, 75, 50)
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TEST_POS_AT (100, 0, 50)
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TEST_POS_AT (110, 0, 40)
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TEST_POS_AT (150, 0, 0)
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TEST_POS_AT (175, 25, 0)
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TEST_POS_AT (250, 100, 0)
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TEST_POS_AT (260, 100, 10)
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TEST_POS_AT (300, 100, 50)
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_rect (builder, &GRAPHENE_RECT_INIT (100, 0, -100, 50));
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path = gsk_path_builder_free_to_path (builder);
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measure = gsk_path_measure_new (path);
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length = gsk_path_measure_get_length (measure);
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g_assert_true (length == 300);
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TEST_POS_AT (0, 100, 0)
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TEST_POS_AT (25, 75, 0)
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TEST_POS_AT (100, 0, 0)
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TEST_POS_AT (110, 0, 10)
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TEST_POS_AT (150, 0, 50)
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TEST_POS_AT (175, 25, 50)
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TEST_POS_AT (250, 100, 50)
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TEST_POS_AT (260, 100, 40)
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TEST_POS_AT (300, 100, 0)
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_rect (builder, &GRAPHENE_RECT_INIT (0, 0, 100, 0));
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path = gsk_path_builder_free_to_path (builder);
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measure = gsk_path_measure_new (path);
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length = gsk_path_measure_get_length (measure);
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g_assert_true (length == 200);
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TEST_POS_AT2 (0, 0, 0, 0)
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TEST_POS_AT2 (25, 25, 0, 25)
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TEST_POS_AT2 (100, 100, 0, 100)
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TEST_POS_AT2 (110, 90, 0, 90)
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TEST_POS_AT2 (200, 0, 0, 0)
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_rect (builder, &GRAPHENE_RECT_INIT (100, 0, -100, 0));
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path = gsk_path_builder_free_to_path (builder);
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measure = gsk_path_measure_new (path);
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length = gsk_path_measure_get_length (measure);
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g_assert_true (length == 200);
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TEST_POS_AT2 (0, 100, 0, 0)
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TEST_POS_AT2 (25, 75, 0, 25)
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TEST_POS_AT2 (100, 0, 0, 100)
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TEST_POS_AT2 (110, 10, 0, 90)
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TEST_POS_AT2 (200, 100, 0, 0)
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_rect (builder, &GRAPHENE_RECT_INIT (0, 100, 0, -100));
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path = gsk_path_builder_free_to_path (builder);
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measure = gsk_path_measure_new (path);
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length = gsk_path_measure_get_length (measure);
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g_assert_true (length == 200);
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TEST_POS_AT2 (0, 0, 100, 0)
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TEST_POS_AT2 (25, 0, 75, 25)
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TEST_POS_AT2 (100, 0, 0, 100)
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TEST_POS_AT2 (110, 0, 10, 90)
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TEST_POS_AT2 (200, 0, 100, 0)
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#undef TEST_POS_AT
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#undef TEST_POS_AT2
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#undef TEST_TANGENT_AT
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gsk_path_measure_unref (measure);
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gsk_path_unref (path);
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}
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int
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main (int argc,
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char *argv[])
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{
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gtk_test_init (&argc, &argv, NULL);
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g_test_add_func ("/measure/bad-split", test_bad_split);
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g_test_add_func ("/measure/bad-in-fill", test_bad_in_fill);
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g_test_add_func ("/measure/rect", test_rect);
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return g_test_run ();
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}
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