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Add a test for tangents of degenerate curves

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The stroker relies on these to work.
This commit is contained in:
Matthias Clasen
2020-12-20 11:19:43 -05:00
parent 75db137ba9
commit 7c3d570ee9
1 changed files with 31 additions and 1 deletions
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32
testsuite/gsk/curve-special-cases.c
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@@ -88,7 +88,6 @@ test_curve_tangents (void)
gsk_curve_get_end_tangent (&c, &t);
g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
graphene_point_init (&p[0], 0, 0);
graphene_point_init (&p[1], 0, 100);
gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_LINE, p));
@@ -121,6 +120,36 @@ test_curve_tangents (void)
g_assert_true (graphene_vec2_near (&t, graphene_vec2_y_axis (), 0.0001));
}
static void
test_curve_degenerate_tangents (void)
{
GskCurve c;
graphene_point_t p[4];
graphene_vec2_t t;
graphene_point_init (&p[0], 0, 0);
graphene_point_init (&p[1], 0, 0);
graphene_point_init (&p[2], 100, 0);
graphene_point_init (&p[3], 100, 0);
gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_CUBIC, p));
gsk_curve_get_start_tangent (&c, &t);
g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
gsk_curve_get_end_tangent (&c, &t);
g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
graphene_point_init (&p[0], 0, 0);
graphene_point_init (&p[1], 50, 0);
graphene_point_init (&p[2], 50, 0);
graphene_point_init (&p[3], 100, 0);
gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_CUBIC, p));
gsk_curve_get_start_tangent (&c, &t);
g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
gsk_curve_get_end_tangent (&c, &t);
g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
}
static gboolean
near_one_point (const graphene_point_t *p,
const graphene_point_t *q,
@@ -286,6 +315,7 @@ main (int argc,
g_test_add_func ("/curve/special/conic-segment", test_conic_segment);
g_test_add_func ("/curve/special/tangents", test_curve_tangents);
g_test_add_func ("/curve/special/degenerate-tangents", test_curve_degenerate_tangents);
g_test_add_func ("/curve/special/intersections", test_curve_intersections);
return g_test_run ();