ScummVM API documentation
easing.h
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/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef TWP_EASING_H
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#define TWP_EASING_H
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#include "common/func.h"
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#include "math/vector2d.h"
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#include "twp/rectf.h"
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namespace
Twp
{
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typedef
float
EasingFunc(
float
t);
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typedef
struct
EasingFunc_t
{
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EasingFunc *func;
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}
EasingFunc_t
;
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enum
InterpolationKind {
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IK_LINEAR = 0,
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IK_EASEIN = 1,
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IK_EASEINOUT = 2,
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IK_EASEOUT = 3,
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IK_SLOWEASEIN = 4,
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IK_SLOWEASEOUT = 5
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};
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struct
InterpolationMethod
{
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InterpolationKind kind = IK_LINEAR;
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bool
loop =
false
;
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bool
swing =
false
;
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};
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InterpolationMethod
intToInterpolationMethod(
int
value);
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static
float
linear(
float
t) {
return
t; }
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static
float
easeIn(
float
t) {
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return
t * t * t * t;
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}
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static
float
easeOut(
float
t) {
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float
f = (t - 1.0f);
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return
f * f * f * (1.0f - t) + 1.0f;
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}
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static
float
easeInOut(
float
t) {
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if
(t < 0.5f)
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return
8.0f * t * t * t * t;
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float
f = (t - 1.0f);
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return
-8.f * f * f * f * f + 1.f;
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}
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inline
EasingFunc_t
easing(InterpolationKind kind) {
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switch
(kind) {
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case
IK_LINEAR:
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return
{&linear};
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case
IK_EASEIN:
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return
{&easeIn};
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case
IK_EASEINOUT:
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return
{&easeInOut};
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case
IK_EASEOUT:
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return
{&easeOut};
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case
IK_SLOWEASEIN:
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return
{&easeIn};
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case
IK_SLOWEASEOUT:
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return
{&easeOut};
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}
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error
(
"Invalid interpolation kind: %d"
, kind);
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return
{&linear};
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}
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}
// namespace Twp
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#endif
Twp::EasingFunc_t
Definition:
easing.h:33
error
void NORETURN_PRE error(MSVC_PRINTF const char *s,...) GCC_PRINTF(1
Twp::InterpolationMethod
Definition:
easing.h:46
Twp
Definition:
achievements_tables.h:27
engines
twp
easing.h
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