f813bd808b
This is to make room in the api for quadratic curves. In detail: - Replace GSK_PATH_CURVE by _CUBIC - Rename gsk_path_builder_curve_to to _cubic_to - Replace GSK_PATH_FOREACH_ALLOW_CURVE with _CUBIC - Replace GskCurveCurve with GskCubicCurve
135 lines
4.2 KiB
C
135 lines
4.2 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 "gsk/gskcurveprivate.h"
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static gboolean
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measure_segment (const graphene_point_t *from,
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const graphene_point_t *to,
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float from_t,
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float to_t,
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GskCurveLineReason reason,
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gpointer data)
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{
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float *length = data;
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*length += graphene_point_distance (from, to, NULL, NULL);
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return TRUE;
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}
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static float
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measure_length (const GskCurve *curve)
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{
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float result = 0;
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gsk_curve_decompose (curve, 0.5, measure_segment, &result);
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return result;
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}
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/* This is a pretty nasty conic that makes it obvious that split()
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* does not respect the progress values, so split() twice with
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* scaled factor won't work.
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*/
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static void
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test_conic_segment (void)
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{
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GskCurve c, s, e, m;
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graphene_point_t pts[4] = {
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GRAPHENE_POINT_INIT (-1856.131591796875, 46.217609405517578125),
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GRAPHENE_POINT_INIT (-1555.9866943359375, 966.0810546875),
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GRAPHENE_POINT_INIT (98.94945526123046875, 0),
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GRAPHENE_POINT_INIT (-1471.33154296875, 526.701171875)
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};
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float start = 0.02222645096480846405029296875;
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float end = 0.982032716274261474609375;
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gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_CONIC, pts));
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gsk_curve_split (&c, start, &s, NULL);
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gsk_curve_segment (&c, start, end, &m);
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gsk_curve_split (&c, end, NULL, &e);
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g_assert_cmpfloat_with_epsilon (measure_length (&c), measure_length (&s) + measure_length (&m) + measure_length (&e), 0.03125);
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}
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static void
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test_curve_tangents (void)
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{
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GskCurve c;
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graphene_point_t p[4];
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graphene_vec2_t t;
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graphene_point_init (&p[0], 0, 0);
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graphene_point_init (&p[1], 100, 0);
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gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_LINE, p));
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gsk_curve_get_start_tangent (&c, &t);
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g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
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gsk_curve_get_end_tangent (&c, &t);
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g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
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graphene_point_init (&p[0], 0, 0);
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graphene_point_init (&p[1], 0, 100);
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gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_LINE, p));
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gsk_curve_get_start_tangent (&c, &t);
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g_assert_true (graphene_vec2_near (&t, graphene_vec2_y_axis (), 0.0001));
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gsk_curve_get_end_tangent (&c, &t);
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g_assert_true (graphene_vec2_near (&t, graphene_vec2_y_axis (), 0.0001));
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graphene_point_init (&p[0], 0, 0);
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graphene_point_init (&p[1], 100, 0);
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p[2] = GRAPHENE_POINT_INIT (g_test_rand_double_range (0, 20), 0);
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graphene_point_init (&p[3], 100, 100);
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gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_CONIC, p));
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gsk_curve_get_start_tangent (&c, &t);
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g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
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gsk_curve_get_end_tangent (&c, &t);
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g_assert_true (graphene_vec2_near (&t, graphene_vec2_y_axis (), 0.0001));
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graphene_point_init (&p[0], 0, 0);
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graphene_point_init (&p[1], 50, 0);
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graphene_point_init (&p[2], 100, 50);
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graphene_point_init (&p[3], 100, 100);
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gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_CUBIC, p));
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gsk_curve_get_start_tangent (&c, &t);
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g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
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gsk_curve_get_end_tangent (&c, &t);
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g_assert_true (graphene_vec2_near (&t, graphene_vec2_y_axis (), 0.0001));
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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 ("/curve/special/conic-segment", test_conic_segment);
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g_test_add_func ("/curve/special/tangents", test_curve_tangents);
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return g_test_run ();
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}
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