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4546f84408
The CSS3 Transitions specification from the W3C defines the possibility
of using a parametrized step() timing function, with the following
prototype:
steps(n_steps, [ start | end ])
where @n_steps represents the number of steps used to divide an interval
between 0 and 1; the 'start' and 'end' tokens describe whether the value
change should happen at the start of the transition, or at the end.
For instance, the "steps(3, start)" timing function has the following
profile:
1 | x
| |
| x---|
| ' |
| x---' |
| ' |
0 |---' |
Whereas the "steps(3, end)" timing function has the following profile:
1 | x---|
| ' |
| x---' |
| ' |
x---' |
| |
0 | |
Since ClutterTimeline uses an enumeration for controlling the progress
mode, we need additional API to define the parameters of the steps()
progress; for this reason, we need a CLUTTER_STEPS enumeration value,
and a method for setting the number of steps and the value transition
policy.
The CSS3 Transitions spec helpfully also defines a step-start and a
step-end shorthands, which expand to step(1, start) and step(1, end)
respectively; we can provide a CLUTTER_STEP_START and CLUTTER_STEP_END
enumeration values for those.
484 lines
10 KiB
C
484 lines
10 KiB
C
#include "config.h"
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#include "clutter-easing.h"
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#include <math.h>
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double
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clutter_linear (double t,
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double d)
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{
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return t / d;
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}
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double
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clutter_ease_in_quad (double t,
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double d)
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{
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double p = t / d;
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return p * p;
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}
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double
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clutter_ease_out_quad (double t,
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double d)
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{
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double p = t / d;
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return -1.0 * p * (p - 2);
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}
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double
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clutter_ease_in_out_quad (double t,
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double d)
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{
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double p = t / (d / 2);
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if (p < 1)
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return 0.5 * p * p;
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p -= 1;
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return -0.5 * (p * (p - 2) - 1);
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}
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double
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clutter_ease_in_cubic (double t,
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double d)
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{
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double p = t / d;
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return p * p * p;
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}
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double
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clutter_ease_out_cubic (double t,
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double d)
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{
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double p = t / d - 1;
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return p * p * p + 1;
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}
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double
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clutter_ease_in_out_cubic (double t,
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double d)
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{
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double p = t / (d / 2);
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if (p < 1)
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return 0.5 * p * p * p;
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p -= 2;
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return 0.5 * (p * p * p + 2);
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}
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double
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clutter_ease_in_quart (double t,
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double d)
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{
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double p = t / d;
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return p * p * p * p;
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}
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double
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clutter_ease_out_quart (double t,
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double d)
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{
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double p = t / d - 1;
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return -1.0 * (p * p * p * p - 1);
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}
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double
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clutter_ease_in_out_quart (double t,
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double d)
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{
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double p = t / (d / 2);
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if (p < 1)
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return 0.5 * p * p * p * p;
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p -= 2;
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return -0.5 * (p * p * p * p - 2);
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}
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double
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clutter_ease_in_quint (double t,
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double d)
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{
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double p = t / d;
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return p * p * p * p * p;
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}
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double
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clutter_ease_out_quint (double t,
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double d)
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{
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double p = t / d - 1;
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return p * p * p * p * p + 1;
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}
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double
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clutter_ease_in_out_quint (double t,
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double d)
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{
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double p = t / (d / 2);
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if (p < 1)
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return 0.5 * p * p * p * p * p;
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p -= 2;
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return 0.5 * (p * p * p * p * p + 2);
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}
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double
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clutter_ease_in_sine (double t,
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double d)
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{
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return -1.0 * cos (t / d * G_PI_2) + 1.0;
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}
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double
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clutter_ease_out_sine (double t,
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double d)
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{
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return sin (t / d * G_PI_2);
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}
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double
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clutter_ease_in_out_sine (double t,
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double d)
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{
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return -0.5 * (cos (G_PI * t / d) - 1);
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}
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double
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clutter_ease_in_expo (double t,
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double d)
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{
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return (t == 0) ? 0.0 : pow (2, 10 * (t / d - 1));
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}
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double
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clutter_ease_out_expo (double t,
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double d)
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{
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return (t == d) ? 1.0 : -pow (2, -10 * t / d) + 1;
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}
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double
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clutter_ease_in_out_expo (double t,
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double d)
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{
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double p;
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if (t == 0)
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return 0.0;
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if (t == d)
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return 1.0;
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p = t / (d / 2);
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if (p < 1)
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return 0.5 * pow (2, 10 * (p - 1));
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p -= 1;
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return 0.5 * (-pow (2, -10 * p) + 2);
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}
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double
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clutter_ease_in_circ (double t,
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double d)
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{
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double p = t / d;
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return -1.0 * (sqrt (1 - p * p) - 1);
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}
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double
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clutter_ease_out_circ (double t,
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double d)
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{
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double p = t / d - 1;
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return sqrt (1 - p * p);
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}
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double
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clutter_ease_in_out_circ (double t,
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double d)
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{
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double p = t / (d / 2);
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if (p < 1)
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return -0.5 * (sqrt (1 - p * p) - 1);
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p -= 2;
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return 0.5 * (sqrt (1 - p * p) + 1);
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}
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double
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clutter_ease_in_elastic (double t,
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double d)
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{
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double p = d * .3;
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double s = p / 4;
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double q = t / d;
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if (q == 1)
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return 1.0;
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q -= 1;
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return -(pow (2, 10 * q) * sin ((q * d - s) * (2 * G_PI) / p));
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}
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double
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clutter_ease_out_elastic (double t,
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double d)
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{
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double p = d * .3;
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double s = p / 4;
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double q = t / d;
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if (q == 1)
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return 1.0;
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return pow (2, -10 * q) * sin ((q * d - s) * (2 * G_PI) / p) + 1.0;
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}
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double
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clutter_ease_in_out_elastic (double t,
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double d)
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{
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double p = d * (.3 * 1.5);
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double s = p / 4;
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double q = t / (d / 2);
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if (q == 2)
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return 1.0;
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if (q < 1)
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{
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q -= 1;
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return -.5 * (pow (2, 10 * q) * sin ((q * d - s) * (2 * G_PI) / p));
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}
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else
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{
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q -= 1;
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return pow (2, -10 * q)
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* sin ((q * d - s) * (2 * G_PI) / p)
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* .5 + 1.0;
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}
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}
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double
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clutter_ease_in_back (double t,
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double d)
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{
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double p = t / d;
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return p * p * ((1.70158 + 1) * p - 1.70158);
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}
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double
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clutter_ease_out_back (double t,
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double d)
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{
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double p = t / d - 1;
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return p * p * ((1.70158 + 1) * p + 1.70158) + 1;
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}
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double
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clutter_ease_in_out_back (double t,
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double d)
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{
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double p = t / (d / 2);
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double s = 1.70158 * 1.525;
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if (p < 1)
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return 0.5 * (p * p * ((s + 1) * p - s));
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p -= 2;
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return 0.5 * (p * p * ((s + 1) * p + s) + 2);
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}
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static inline double
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ease_out_bounce_internal (double t,
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double d)
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{
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double p = t / d;
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if (p < (1 / 2.75))
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{
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return 7.5625 * p * p;
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}
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else if (p < (2 / 2.75))
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{
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p -= (1.5 / 2.75);
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return 7.5625 * p * p + .75;
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}
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else if (p < (2.5 / 2.75))
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{
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p -= (2.25 / 2.75);
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return 7.5625 * p * p + .9375;
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}
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else
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{
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p -= (2.625 / 2.75);
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return 7.5625 * p * p + .984375;
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}
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}
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static inline double
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ease_in_bounce_internal (double t,
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double d)
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{
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return 1.0 - ease_out_bounce_internal (d - t, d);
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}
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double
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clutter_ease_in_bounce (double t,
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double d)
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{
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return ease_in_bounce_internal (t, d);
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}
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double
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clutter_ease_out_bounce (double t,
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double d)
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{
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return ease_out_bounce_internal (t, d);
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}
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double
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clutter_ease_in_out_bounce (double t,
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double d)
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{
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if (t < d / 2)
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return ease_in_bounce_internal (t * 2, d) * 0.5;
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else
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return ease_out_bounce_internal (t * 2 - d, d) * 0.5 + 1.0 * 0.5;
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}
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static inline double
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ease_steps_end (double p,
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int n_steps)
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{
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return floor (p * (double) n_steps) / (double) n_steps;
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}
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double
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clutter_ease_steps_start (double t,
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double d,
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int n_steps)
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{
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return 1.0 - ease_steps_end (1.0 - (t / d), n_steps);
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}
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double
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clutter_ease_steps_end (double t,
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double d,
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int n_steps)
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{
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return ease_steps_end ((t / d), n_steps);
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}
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/*< private >
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* _clutter_animation_modes:
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*
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* A mapping of animation modes and easing functions.
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*/
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static const struct {
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ClutterAnimationMode mode;
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ClutterEasingFunc func;
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const char *name;
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} _clutter_animation_modes[] = {
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{ CLUTTER_CUSTOM_MODE, NULL, "custom" },
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{ CLUTTER_LINEAR, clutter_linear, "linear" },
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{ CLUTTER_EASE_IN_QUAD, clutter_ease_in_quad, "easeInQuad" },
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{ CLUTTER_EASE_OUT_QUAD, clutter_ease_out_quad, "easeOutQuad" },
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{ CLUTTER_EASE_IN_OUT_QUAD, clutter_ease_in_out_quad, "easeInOutQuad" },
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{ CLUTTER_EASE_IN_CUBIC, clutter_ease_in_cubic, "easeInCubic" },
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{ CLUTTER_EASE_OUT_CUBIC, clutter_ease_out_cubic, "easeOutCubic" },
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{ CLUTTER_EASE_IN_OUT_CUBIC, clutter_ease_in_out_cubic, "easeInOutCubic" },
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{ CLUTTER_EASE_IN_QUART, clutter_ease_in_quart, "easeInQuart" },
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{ CLUTTER_EASE_OUT_QUART, clutter_ease_out_quart, "easeOutQuart" },
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{ CLUTTER_EASE_IN_OUT_QUART, clutter_ease_in_out_quart, "easeInOutQuart" },
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{ CLUTTER_EASE_IN_QUINT, clutter_ease_in_quint, "easeInQuint" },
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{ CLUTTER_EASE_OUT_QUINT, clutter_ease_out_quint, "easeOutQuint" },
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{ CLUTTER_EASE_IN_OUT_QUINT, clutter_ease_in_out_quint, "easeInOutQuint" },
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{ CLUTTER_EASE_IN_SINE, clutter_ease_in_sine, "easeInSine" },
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{ CLUTTER_EASE_OUT_SINE, clutter_ease_out_sine, "easeOutSine" },
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{ CLUTTER_EASE_IN_OUT_SINE, clutter_ease_in_out_sine, "easeInOutSine" },
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{ CLUTTER_EASE_IN_EXPO, clutter_ease_in_expo, "easeInExpo" },
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{ CLUTTER_EASE_OUT_EXPO, clutter_ease_out_expo, "easeOutExpo" },
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{ CLUTTER_EASE_IN_OUT_EXPO, clutter_ease_in_out_expo, "easeInOutExpo" },
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{ CLUTTER_EASE_IN_CIRC, clutter_ease_in_circ, "easeInCirc" },
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{ CLUTTER_EASE_OUT_CIRC, clutter_ease_out_circ, "easeOutCirc" },
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{ CLUTTER_EASE_IN_OUT_CIRC, clutter_ease_in_out_circ, "easeInOutCirc" },
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{ CLUTTER_EASE_IN_ELASTIC, clutter_ease_in_elastic, "easeInElastic" },
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{ CLUTTER_EASE_OUT_ELASTIC, clutter_ease_out_elastic, "easeOutElastic" },
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{ CLUTTER_EASE_IN_OUT_ELASTIC, clutter_ease_in_out_elastic, "easeInOutElastic" },
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{ CLUTTER_EASE_IN_BACK, clutter_ease_in_back, "easeInBack" },
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{ CLUTTER_EASE_OUT_BACK, clutter_ease_out_back, "easeOutBack" },
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{ CLUTTER_EASE_IN_OUT_BACK, clutter_ease_in_out_back, "easeInOutBack" },
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{ CLUTTER_EASE_IN_BOUNCE, clutter_ease_in_bounce, "easeInBounce" },
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{ CLUTTER_EASE_OUT_BOUNCE, clutter_ease_out_bounce, "easeOutBounce" },
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{ CLUTTER_EASE_IN_OUT_BOUNCE, clutter_ease_in_out_bounce, "easeInOutBounce" },
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{ CLUTTER_STEPS, (ClutterEasingFunc) clutter_ease_steps_end, "steps" },
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{ CLUTTER_STEP_START, (ClutterEasingFunc) clutter_ease_steps_start, "stepStart" },
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{ CLUTTER_STEP_END, (ClutterEasingFunc) clutter_ease_steps_end, "stepEnd" },
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{ CLUTTER_ANIMATION_LAST, NULL, "sentinel" },
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};
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ClutterEasingFunc
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clutter_get_easing_func_for_mode (ClutterAnimationMode mode)
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{
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g_assert (_clutter_animation_modes[mode].mode == mode);
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g_assert (_clutter_animation_modes[mode].func != NULL);
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return _clutter_animation_modes[mode].func;
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}
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const char *
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clutter_get_easing_name_for_mode (ClutterAnimationMode mode)
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{
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g_assert (_clutter_animation_modes[mode].mode == mode);
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g_assert (_clutter_animation_modes[mode].func != NULL);
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return _clutter_animation_modes[mode].name;
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}
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double
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clutter_easing_for_mode (ClutterAnimationMode mode,
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double t,
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double d)
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{
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g_assert (_clutter_animation_modes[mode].mode == mode);
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g_assert (_clutter_animation_modes[mode].func != NULL);
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return _clutter_animation_modes[mode].func (t, d);
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}
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