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eina: add new api eina_bezier_on_interval() 

I couldn't come up with a better name, if anyone has a suggestion.

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>
This commit is contained in:
Subhransu Mohanty 2015-11-25 14:09:59 +09:00 committed by Cedric BAIL
parent 78eb21296c
commit 8212f2aee3
3 changed files with 53 additions and 0 deletions
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18
src/lib/eina/eina_bezier.c
View File

@ -313,3 +313,21 @@ eina_bezier_bounds_get(const Eina_Bezier *b, double *x, double *y, double *w, do
if (w) *w = xmax - xmin;
if (h) *h = ymax - ymin;
}
EAPI void
eina_bezier_on_interval(Eina_Bezier *b, double t0, double t1, Eina_Bezier *result)
{
Eina_Bezier bezier;
double t;
if (t0 == 0 && t1 == 1)
{
*result = *b;
return;
}
bezier = *b;
_eina_bezier_split_left(&bezier, t0, result);
t = (t1-t0)/(1-t0);
_eina_bezier_split_left(&bezier, t, result);
}

13
src/lib/eina/eina_bezier.h
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@ -157,4 +157,17 @@ EAPI void eina_bezier_split_at_length(const Eina_Bezier *b, double len, Eina_Bez
*/
EAPI void eina_bezier_bounds_get(const Eina_Bezier *b, double *x, double *y, double *w, double *h) EINA_ARG_NONNULL(1);
/**
* @brief find the bezier at given interval.
*
* @param b The floating point bezier.
* @param t0 The start interval.
* @param t1 The end interval.
* @param result The result bezier.
*
* @p b. No check is done on @p b.
* @since 1.16
*/
EAPI void eina_bezier_on_interval(Eina_Bezier *b, double t0, double t1, Eina_Bezier *result);
#endif // EINA_BEZIER_H

22
src/tests/eina/eina_test_bezier.c
View File

@ -195,6 +195,27 @@ START_TEST(eina_bezier_test_bounds_get)
}
END_TEST
START_TEST(eina_bezier_test_on_interval)
{
Eina_Bezier b, res;
double px1, px2, py1, py2;
eina_init();
eina_bezier_values_set(&b,
0, 0,
10, 20,
20, 90,
30, 0);
eina_bezier_point_at(&b, 0.25, &px1, &py1);
eina_bezier_on_interval(&b, 0.25, 0.5, &res);
eina_bezier_point_at(&res, 0, &px2, &py2);
fail_if(px1 != px2 || py1 != py2);
eina_shutdown();
}
END_TEST
void
eina_test_bezier(TCase *tc)
{
@ -205,4 +226,5 @@ eina_test_bezier(TCase *tc)
tcase_add_test(tc, eina_bezier_test_point_at);
tcase_add_test(tc, eina_bezier_test_split_at_length);
tcase_add_test(tc, eina_bezier_test_bounds_get);
tcase_add_test(tc, eina_bezier_test_on_interval);
}