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clutter/point: Add ClutterPoint quarilateral testing API

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Add a function to check whether a point is inside a quadrilateral
by checking the cross product of vectors with the quadrilateral
points, and the point being checked.

If the passed quadrilateral is zero-sized, no point is ever reported
to be inside it.

This will be used by the next commit when comparing the transformed
actor vertices.

[feaneron: add a commit message and remove unecessary code]

https://gitlab.gnome.org/GNOME/mutter/merge_requests/189
This commit is contained in:
Daniel van Vugt
2019-07-18 16:56:41 +08:00
committed by Jonas Ådahl
parent fdda8adfcf
commit a70823dd1c
4 changed files with 150 additions and 0 deletions
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1
src/tests/clutter/conform/meson.build
View File

@ -33,6 +33,7 @@ clutter_conform_tests_general_tests = [
'interval',
'script-parser',
'units',
'point',
]
clutter_conform_tests_deprecated_tests = [

84
src/tests/clutter/conform/point.c Normal file
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@ -0,0 +1,84 @@
#include "tests/clutter-test-utils.h"
#include <clutter/clutter.h>
static void
point_on_nonempty_quadrilateral (void)
{
int p;
static const ClutterPoint vertices[4] =
{
{ 1.f, 2.f },
{ 6.f, 3.f },
{ 7.f, 6.f },
{ 0.f, 5.f }
};
static const ClutterPoint points_inside[] =
{
{ 2.f, 3.f },
{ 1.f, 4.f },
{ 5.f, 5.f },
{ 4.f, 3.f },
};
static const ClutterPoint points_outside[] =
{
{ 3.f, 1.f },
{ 7.f, 4.f },
{ 4.f, 6.f },
{ 99.f, -77.f },
{ -1.f, 3.f },
{ -8.f, -8.f },
{ 11.f, 4.f },
{ -7.f, 4.f },
};
for (p = 0; p < G_N_ELEMENTS (points_inside); p++)
{
const ClutterPoint *point = &points_inside[p];
g_assert_true (clutter_point_inside_quadrilateral (point, vertices));
}
for (p = 0; p < G_N_ELEMENTS (points_outside); p++)
{
const ClutterPoint *point = &points_outside[p];
g_assert_false (clutter_point_inside_quadrilateral (point, vertices));
}
}
static void
point_on_empty_quadrilateral (void)
{
int p;
static const ClutterPoint vertices[4] =
{
{ 5.f, 6.f },
{ 5.f, 6.f },
{ 5.f, 6.f },
{ 5.f, 6.f },
};
static const ClutterPoint points_outside[] =
{
{ 3.f, 1.f },
{ 7.f, 4.f },
{ 4.f, 6.f },
{ 99.f, -77.f },
{ -1.f, 3.f },
{ -8.f, -8.f },
};
for (p = 0; p < G_N_ELEMENTS (points_outside); p++)
{
const ClutterPoint *point = &points_outside[p];
g_assert_false (clutter_point_inside_quadrilateral (point, vertices));
}
g_assert_false (clutter_point_inside_quadrilateral (&vertices[0], vertices));
}
CLUTTER_TEST_SUITE (
CLUTTER_TEST_UNIT ("/point/on_nonempty_quadrilateral", point_on_nonempty_quadrilateral)
CLUTTER_TEST_UNIT ("/point/on_empty_quadrilateral", point_on_empty_quadrilateral)
)