mutter/clutter/clutter-easing.c

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5.8 KiB
C
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#include "config.h"
#include "clutter-easing.h"
#include <math.h>
double
clutter_linear (double t,
double d)
{
return t / d;
}
double
clutter_ease_in_quad (double t,
double d)
{
double p = t / d;
return p * p;
}
double
clutter_ease_out_quad (double t,
double d)
{
double p = t / d;
return -1.0 * p * (p - 2);
}
double
clutter_ease_in_out_quad (double t,
double d)
{
double p = t / (d / 2);
if (p < 1)
return 0.5 * p * p;
p -= 1;
return -0.5 * (p * (p - 2) - 1);
}
double
clutter_ease_in_cubic (double t,
double d)
{
double p = t / d;
return p * p * p;
}
double
clutter_ease_out_cubic (double t,
double d)
{
double p = t / d - 1;
return p * p * p + 1;
}
double
clutter_ease_in_out_cubic (double t,
double d)
{
double p = t / (d / 2);
if (p < 1)
return 0.5 * p * p * p;
p -= 2;
return 0.5 * (p * p * p + 2);
}
double
clutter_ease_in_quart (double t,
double d)
{
double p = t / d;
return p * p * p * p;
}
double
clutter_ease_out_quart (double t,
double d)
{
double p = t / d - 1;
return -1.0 * (p * p * p * p - 1);
}
double
clutter_ease_in_out_quart (double t,
double d)
{
double p = t / (d / 2);
if (p < 1)
return 0.5 * p * p * p * p;
p -= 2;
return -0.5 * (p * p * p * p - 2);
}
double
clutter_ease_in_quint (double t,
double d)
{
double p = t / d;
return p * p * p * p * p;
}
double
clutter_ease_out_quint (double t,
double d)
{
double p = t / d - 1;
return p * p * p * p * p + 1;
}
double
clutter_ease_in_out_quint (double t,
double d)
{
double p = t / (d / 2);
if (p < 1)
return 0.5 * p * p * p * p * p;
p -= 2;
return 0.5 * (p * p * p * p * p + 2);
}
double
clutter_ease_in_sine (double t,
double d)
{
return -1.0 * cos (t / d * G_PI_2) + 1.0;
}
double
clutter_ease_out_sine (double t,
double d)
{
return sin (t / d * G_PI_2);
}
double
clutter_ease_in_out_sine (double t,
double d)
{
return -0.5 * (cos (G_PI * t / d) - 1);
}
double
clutter_ease_in_expo (double t,
double d)
{
return (t == 0) ? 0.0 : pow (2, 10 * (t / d - 1));
}
double
clutter_ease_out_expo (double t,
double d)
{
return (t == d) ? 1.0 : -pow (2, -10 * t / d) + 1;
}
double
clutter_ease_in_out_expo (double t,
double d)
{
double p;
if (t == 0)
return 0.0;
if (t == d)
return 1.0;
p = t / (d / 2);
if (p < 1)
return 0.5 * pow (2, 10 * (p - 1));
p -= 1;
return 0.5 * (-pow (2, -10 * p) + 2);
}
double
clutter_ease_in_circ (double t,
double d)
{
double p = t / d;
return -1.0 * (sqrt (1 - p * p) - 1);
}
double
clutter_ease_out_circ (double t,
double d)
{
double p = t / d - 1;
return sqrt (1 - p * p);
}
double
clutter_ease_in_out_circ (double t,
double d)
{
double p = t / (d / 2);
if (p < 1)
return -0.5 * (sqrt (1 - p * p) - 1);
p -= 2;
return 0.5 * (sqrt (1 - p * p) + 1);
}
double
clutter_ease_in_elastic (double t,
double d)
{
double p = d * .3;
double s = p / 4;
double q = t / d;
if (q == 1)
return 1.0;
q -= 1;
return -(pow (2, 10 * q) * sin ((q * d - s) * (2 * G_PI) / p));
}
double
clutter_ease_out_elastic (double t,
double d)
{
double p = d * .3;
double s = p / 4;
double q = t / d;
if (q == 1)
return 1.0;
return pow (2, -10 * q) * sin ((q * d - s) * (2 * G_PI) / p) + 1.0;
}
double
clutter_ease_in_out_elastic (double t,
double d)
{
double p = d * (.3 * 1.5);
double s = p / 4;
double q = t / (d / 2);
if (q == 2)
return 1.0;
if (q < 1)
{
q -= 1;
return -.5 * (pow (2, 10 * q) * sin ((q * d - s) * (2 * G_PI) / p));
}
else
{
q -= 1;
return pow (2, -10 * q)
* sin ((q * d - s) * (2 * G_PI) / p)
* .5 + 1.0;
}
}
double
clutter_ease_in_back (double t,
double d)
{
double p = t / d;
return p * p * ((1.70158 + 1) * p - 1.70158);
}
double
clutter_ease_out_back (double t,
double d)
{
double p = t / d - 1;
return p * p * ((1.70158 + 1) * p + 1.70158) + 1;
}
double
clutter_ease_in_out_back (double t,
double d)
{
double p = t / (d / 2);
double s = 1.70158 * 1.525;
if (p < 1)
return 0.5 * (p * p * ((s + 1) * p - s));
p -= 2;
return 0.5 * (p * p * ((s + 1) * p + s) + 2);
}
static inline double
ease_out_bounce_internal (double t,
double d)
{
double p = t / d;
if (p < (1 / 2.75))
{
return 7.5625 * p * p;
}
else if (p < (2 / 2.75))
{
p -= (1.5 / 2.75);
return 7.5625 * p * p + .75;
}
else if (p < (2.5 / 2.75))
{
p -= (2.25 / 2.75);
return 7.5625 * p * p + .9375;
}
else
{
p -= (2.625 / 2.75);
return 7.5625 * p * p + .984375;
}
}
static inline double
ease_in_bounce_internal (double t,
double d)
{
return 1.0 - ease_out_bounce_internal (d - t, d);
}
double
clutter_ease_in_bounce (double t,
double d)
{
return ease_in_bounce_internal (t, d);
}
double
clutter_ease_out_bounce (double t,
double d)
{
return ease_out_bounce_internal (t, d);
}
double
clutter_ease_in_out_bounce (double t,
double d)
{
if (t < d / 2)
return ease_in_bounce_internal (t * 2, d) * 0.5;
else
return ease_out_bounce_internal (t * 2 - d, d) * 0.5 + 1.0 * 0.5;
}