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curve: Add a get_derivative vfunc

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This commit is contained in:
Matthias Clasen 2023-08-16 20:40:47 -04:00
parent 88e74ca21e
commit 07ec266a00
2 changed files with 64 additions and 57 deletions
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119
gsk/gskcurve.c
View File

@ -76,6 +76,8 @@ struct _GskCurveClass
GskBoundingBox *bounds);
void (* get_tight_bounds) (const GskCurve *curve,
GskBoundingBox *bounds);
void (* get_derivative) (const GskCurve *curve,
GskCurve *derivative);
};
/* {{{ Utilities */
@ -311,6 +313,19 @@ gsk_line_curve_get_bounds (const GskCurve *curve,
gsk_bounding_box_init (bounds, &pts[0], &pts[1]);
}
static void
gsk_line_curve_get_derivative (const GskCurve *curve,
GskCurve *deriv)
{
const GskLineCurve *self = &curve->line;
graphene_point_t p;
p.x = self->points[1].x - self->points[0].x;
p.y = self->points[1].y - self->points[0].y;
gsk_line_curve_init_from_points (&deriv->line, GSK_PATH_LINE, &p, &p);
}
static const GskCurveClass GSK_LINE_CURVE_CLASS = {
gsk_line_curve_init,
gsk_line_curve_init_foreach,
@ -330,6 +345,7 @@ static const GskCurveClass GSK_LINE_CURVE_CLASS = {
gsk_line_curve_decompose_curve,
gsk_line_curve_get_bounds,
gsk_line_curve_get_bounds,
gsk_line_curve_get_derivative,
};
/* }}} */
@ -670,6 +686,21 @@ gsk_quad_curve_get_tight_bounds (const GskCurve *curve,
}
}
static void
gsk_quad_curve_get_derivative (const GskCurve *curve,
GskCurve *deriv)
{
const GskQuadCurve *self = &curve->quad;
graphene_point_t p[2];
p[0].x = 2.f * (self->points[1].x - self->points[0].x);
p[0].y = 2.f * (self->points[1].y - self->points[0].y);
p[1].x = 2.f * (self->points[2].x - self->points[1].x);
p[1].y = 2.f * (self->points[2].y - self->points[1].y);
gsk_line_curve_init_from_points (&deriv->line, GSK_PATH_LINE, &p[0], &p[1]);
}
static const GskCurveClass GSK_QUAD_CURVE_CLASS = {
gsk_quad_curve_init,
gsk_quad_curve_init_foreach,
@ -689,6 +720,7 @@ static const GskCurveClass GSK_QUAD_CURVE_CLASS = {
gsk_quad_curve_decompose_curve,
gsk_quad_curve_get_bounds,
gsk_quad_curve_get_tight_bounds,
gsk_quad_curve_get_derivative,
};
/* }}} */
@ -859,61 +891,6 @@ gsk_cubic_curve_reverse (const GskCurve *curve,
reverse->cubic.has_coefficients = FALSE;
}
static void
gsk_curve_get_derivative (const GskCurve *curve,
GskCurve *deriv)
{
switch (curve->op)
{
case GSK_PATH_LINE:
{
const GskLineCurve *self = &curve->line;
graphene_point_t p;
p.x = self->points[1].x - self->points[0].x;
p.y = self->points[1].y - self->points[0].y;
gsk_line_curve_init_from_points (&deriv->line, GSK_PATH_LINE, &p, &p);
}
break;
case GSK_PATH_QUAD:
{
const GskQuadCurve *self = &curve->quad;
graphene_point_t p[2];
p[0].x = 2.f * (self->points[1].x - self->points[0].x);
p[0].y = 2.f * (self->points[1].y - self->points[0].y);
p[1].x = 2.f * (self->points[2].x - self->points[1].x);
p[1].y = 2.f * (self->points[2].y - self->points[1].y);
gsk_line_curve_init_from_points (&deriv->line, GSK_PATH_LINE, &p[0], &p[1]);
}
break;
case GSK_PATH_CUBIC:
{
const GskCubicCurve *self = &curve->cubic;
graphene_point_t p[3];
p[0].x = 3.f * (self->points[1].x - self->points[0].x);
p[0].y = 3.f * (self->points[1].y - self->points[0].y);
p[1].x = 3.f * (self->points[2].x - self->points[1].x);
p[1].y = 3.f * (self->points[2].y - self->points[1].y);
p[2].x = 3.f * (self->points[3].x - self->points[2].x);
p[2].y = 3.f * (self->points[3].y - self->points[2].y);
gsk_quad_curve_init_from_points (&deriv->quad, p);
}
break;
case GSK_PATH_MOVE:
case GSK_PATH_CLOSE:
default:
g_assert_not_reached ();
}
}
static inline float
cross (const graphene_vec2_t *v1,
const graphene_vec2_t *v2)
@ -928,6 +905,9 @@ pow3 (float w)
return w * w * w;
}
static void gsk_cubic_curve_get_derivative (const GskCurve *curve,
GskCurve *deriv);
static float
gsk_cubic_curve_get_curvature (const GskCurve *curve,
float t)
@ -937,8 +917,8 @@ gsk_cubic_curve_get_curvature (const GskCurve *curve,
graphene_vec2_t d, dd;
float num, denom;
gsk_curve_get_derivative (curve, &c1);
gsk_curve_get_derivative (&c1, &c2);
gsk_cubic_curve_get_derivative (curve, &c1);
gsk_quad_curve_get_derivative (&c1, &c2);
gsk_curve_get_point (&c1, t, &p);
gsk_curve_get_point (&c2, t, &pp);
@ -1150,6 +1130,23 @@ gsk_cubic_curve_get_tight_bounds (const GskCurve *curve,
}
}
static void
gsk_cubic_curve_get_derivative (const GskCurve *curve,
GskCurve *deriv)
{
const GskCubicCurve *self = &curve->cubic;
graphene_point_t p[3];
p[0].x = 3.f * (self->points[1].x - self->points[0].x);
p[0].y = 3.f * (self->points[1].y - self->points[0].y);
p[1].x = 3.f * (self->points[2].x - self->points[1].x);
p[1].y = 3.f * (self->points[2].y - self->points[1].y);
p[2].x = 3.f * (self->points[3].x - self->points[2].x);
p[2].y = 3.f * (self->points[3].y - self->points[2].y);
gsk_quad_curve_init_from_points (&deriv->quad, p);
}
static const GskCurveClass GSK_CUBIC_CURVE_CLASS = {
gsk_cubic_curve_init,
gsk_cubic_curve_init_foreach,
@ -1169,6 +1166,7 @@ static const GskCurveClass GSK_CUBIC_CURVE_CLASS = {
gsk_cubic_curve_decompose_curve,
gsk_cubic_curve_get_bounds,
gsk_cubic_curve_get_tight_bounds,
gsk_cubic_curve_get_derivative,
};
/* }}} */
@ -1359,6 +1357,13 @@ gsk_curve_get_tight_bounds (const GskCurve *curve,
get_class (curve->op)->get_tight_bounds (curve, bounds);
}
void
gsk_curve_get_derivative (const GskCurve *curve,
GskCurve *deriv)
{
get_class (curve->op)->get_derivative (curve, deriv);
}
static inline int
line_get_crossing (const graphene_point_t *p,
const graphene_point_t *p1,

2
gsk/gskcurveprivate.h
View File

@ -145,6 +145,8 @@ void gsk_curve_get_bounds (const GskCurve
void gsk_curve_get_tight_bounds (const GskCurve *curve,
GskBoundingBox *bounds);
void gsk_curve_get_derivative (const GskCurve *curve,
GskCurve *derivative);
int gsk_curve_get_crossing (const GskCurve *curve,
const graphene_point_t *point);
gboolean gsk_curve_get_closest_point (const GskCurve *curve,