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Add a test for gsk_curve_offset

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The stroker relies on offsetting.
This only tests a few very simple cases.
This commit is contained in:
Matthias Clasen
2020-12-20 12:58:53 -05:00
parent 639380003f
commit 1624ba6aca
1 changed files with 109 additions and 0 deletions
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109
testsuite/gsk/curve.c
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@@ -1128,6 +1128,114 @@ test_curve_split (void)
}
}
#define DEG_TO_RAD(x) ((x)*M_PI/180)
static float
line_point_distance (const graphene_point_t *a,
const graphene_point_t *b,
const graphene_point_t *p)
{
graphene_vec2_t n, ap, r;
graphene_vec2_init (&n, b->x - a->x, b->y - a->y);
graphene_vec2_normalize (&n, &n);
graphene_vec2_init (&ap, a->x - p->x, a->y - p->y);
graphene_vec2_scale (&n, graphene_vec2_dot (&ap, &n), &r);
graphene_vec2_subtract (&ap, &r, &r);
return graphene_vec2_length (&r);
}
/* Test simple cases of curve offsetting */
static void
test_curve_offset (void)
{
GskCurve c, r;
graphene_point_t p[4];
graphene_point_init (&p[0], 0, 0);
graphene_point_init (&p[1], 50, 0);
gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_LINE, p));
gsk_curve_offset (&c, 10, &r);
g_assert_true (r.op == GSK_PATH_LINE);
g_assert_true (graphene_point_near (&r.line.points[0], &GRAPHENE_POINT_INIT (0, 10), 0.0001));
g_assert_true (graphene_point_near (&r.line.points[1], &GRAPHENE_POINT_INIT (50, 10), 0.0001));
gsk_curve_offset (&c, -10, &r);
g_assert_true (r.op == GSK_PATH_LINE);
g_assert_true (graphene_point_near (&r.line.points[0], &GRAPHENE_POINT_INIT (0, -10), 0.0001));
g_assert_true (graphene_point_near (&r.line.points[1], &GRAPHENE_POINT_INIT (50, -10), 0.0001));
graphene_point_init (&p[0], 0, 0);
graphene_point_init (&p[1], 50, 0);
graphene_point_init (&p[2], 100, 50);
graphene_point_init (&p[3], 100, 100);
gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_CUBIC, p));
gsk_curve_offset (&c, 10, &r);
g_assert_true (r.op == GSK_PATH_CUBIC);
g_assert_true (graphene_point_near (&r.cubic.points[0], &GRAPHENE_POINT_INIT (0, 10), 0.0001));
g_assert_cmpfloat_with_epsilon (r.cubic.points[1].y, 10.0, 0.001);
g_assert_cmpfloat_with_epsilon (line_point_distance (&p[0], &p[1], &r.cubic.points[1]), 10.0, 0.001);
g_assert_cmpfloat_with_epsilon (line_point_distance (&p[1], &p[2], &r.cubic.points[1]), 10.0, 0.001);
g_assert_cmpfloat_with_epsilon (r.cubic.points[2].x, 90.0, 0.001);
g_assert_cmpfloat_with_epsilon (line_point_distance (&p[1], &p[2], &r.cubic.points[2]), 10.0, 0.001);
g_assert_cmpfloat_with_epsilon (line_point_distance (&p[2], &p[3], &r.cubic.points[2]), 10.0, 0.001);
g_assert_true (graphene_point_near (&r.cubic.points[3], &GRAPHENE_POINT_INIT (90, 100), 0.0001));
gsk_curve_offset (&c, -10, &r);
g_assert_true (r.op == GSK_PATH_CUBIC);
g_assert_true (graphene_point_near (&r.cubic.points[0], &GRAPHENE_POINT_INIT (0, -10), 0.0001));
g_assert_cmpfloat_with_epsilon (r.cubic.points[1].y, -10.0, 0.001);
g_assert_cmpfloat_with_epsilon (line_point_distance (&p[0], &p[1], &r.cubic.points[1]), 10.0, 0.001);
g_assert_cmpfloat_with_epsilon (line_point_distance (&p[1], &p[2], &r.cubic.points[1]), 10.0, 0.001);
g_assert_cmpfloat_with_epsilon (r.cubic.points[2].x, 110.0, 0.001);
g_assert_cmpfloat_with_epsilon (line_point_distance (&p[1], &p[2], &r.cubic.points[2]), 10.0, 0.001);
g_assert_cmpfloat_with_epsilon (line_point_distance (&p[2], &p[3], &r.cubic.points[2]), 10.0, 0.001);
g_assert_true (graphene_point_near (&r.cubic.points[3], &GRAPHENE_POINT_INIT (110, 100), 0.0001));
graphene_point_init (&p[0], 0, 0);
graphene_point_init (&p[1], 100, 0);
graphene_point_init (&p[2], 100, 100);
gsk_curve_init_foreach (&c, GSK_PATH_CONIC, p, 3, 20);
gsk_curve_offset (&c, 10, &r);
g_assert_true (r.op == GSK_PATH_CONIC);
g_assert_true (graphene_point_near (&r.conic.points[0], &GRAPHENE_POINT_INIT (0, 10), 0.0001));
g_assert_true (graphene_point_near (&r.conic.points[1], &GRAPHENE_POINT_INIT (90, 10), 0.0001));
g_assert_true (graphene_point_near (&r.conic.points[3], &GRAPHENE_POINT_INIT (90, 100), 0.0001));
gsk_curve_offset (&c, -10, &r);
g_assert_true (r.op == GSK_PATH_CONIC);
g_assert_true (graphene_point_near (&r.conic.points[0], &GRAPHENE_POINT_INIT (0, -10), 0.0001));
g_assert_true (graphene_point_near (&r.conic.points[1], &GRAPHENE_POINT_INIT (110, -10), 0.0001));
g_assert_true (graphene_point_near (&r.conic.points[3], &GRAPHENE_POINT_INIT (110, 100), 0.0001));
}
int
main (int argc, char *argv[])
{
@@ -1157,6 +1265,7 @@ main (int argc, char *argv[])
g_test_add_func ("/curve/intersection/horizontal-line", test_curve_intersection_horizontal_line);
g_test_add_func ("/curve/intersection/match", test_curve_intersection_match);
g_test_add_func ("/curve/split", test_curve_split);
g_test_add_func ("/curve/offset", test_curve_offset);
return g_test_run ();
}