106 lines
3.4 KiB
C++
106 lines
3.4 KiB
C++
#pragma once
|
||
|
||
#include <easy2d/core/types.h>
|
||
#include <easy2d/core/math_types.h>
|
||
#include <easy2d/core/color.h>
|
||
#include <easy2d/animation/animation_frame.h>
|
||
#include <cmath>
|
||
|
||
namespace easy2d {
|
||
|
||
// ============================================================================
|
||
// 插值结果 - 两帧之间的插值后属性
|
||
// ============================================================================
|
||
struct InterpolatedProperties {
|
||
Vec2 position;
|
||
Vec2 scale = Vec2::One();
|
||
float rotation = 0.0f;
|
||
Color color = Colors::White;
|
||
};
|
||
|
||
// ============================================================================
|
||
// 插值曲线类型
|
||
// ============================================================================
|
||
enum class InterpolationCurve : uint8 {
|
||
Linear, // 线性（原始系统的 uniform velocity）
|
||
EaseIn, // 缓入
|
||
EaseOut, // 缓出
|
||
EaseInOut, // 缓入缓出
|
||
};
|
||
|
||
// ============================================================================
|
||
// InterpolationEngine - 帧间属性插值计算（静态方法，无状态）
|
||
// 独立于 AnimationController，可复用于其他系统
|
||
// ============================================================================
|
||
class InterpolationEngine {
|
||
public:
|
||
/// 核心插值计算：根据 t 因子 (0~1) 计算两帧之间的插值属性
|
||
static InterpolatedProperties interpolate(
|
||
const AnimationFrame& from,
|
||
const AnimationFrame& to,
|
||
float t,
|
||
InterpolationCurve curve = InterpolationCurve::Linear)
|
||
{
|
||
float curvedT = applyCurve(t, curve);
|
||
|
||
InterpolatedProperties result;
|
||
result.position = lerpPosition(from, to, curvedT);
|
||
result.scale = lerpScale(from, to, curvedT);
|
||
result.rotation = lerpRotation(from, to, curvedT);
|
||
result.color = lerpColor(from, to, curvedT);
|
||
return result;
|
||
}
|
||
|
||
/// 位置插值
|
||
static Vec2 lerpPosition(const AnimationFrame& from, const AnimationFrame& to, float t) {
|
||
return Vec2::lerp(from.offset, to.offset, t);
|
||
}
|
||
|
||
/// 缩放插值
|
||
static Vec2 lerpScale(const AnimationFrame& from, const AnimationFrame& to, float t) {
|
||
Vec2 fromScale = from.getEffectiveScale();
|
||
Vec2 toScale = to.getEffectiveScale();
|
||
return Vec2::lerp(fromScale, toScale, t);
|
||
}
|
||
|
||
/// 旋转插值
|
||
static float lerpRotation(const AnimationFrame& from, const AnimationFrame& to, float t) {
|
||
float fromRot = from.getEffectiveRotation();
|
||
float toRot = to.getEffectiveRotation();
|
||
return math::lerp(fromRot, toRot, t);
|
||
}
|
||
|
||
/// 颜色插值
|
||
static Color lerpColor(const AnimationFrame& from, const AnimationFrame& to, float t) {
|
||
Color fromColor = from.getEffectiveColor();
|
||
Color toColor = to.getEffectiveColor();
|
||
return Color::lerp(fromColor, toColor, t);
|
||
}
|
||
|
||
/// 应用曲线函数
|
||
static float applyCurve(float t, InterpolationCurve curve) {
|
||
t = math::clamp(t, 0.0f, 1.0f);
|
||
|
||
switch (curve) {
|
||
case InterpolationCurve::Linear:
|
||
return t;
|
||
|
||
case InterpolationCurve::EaseIn:
|
||
return t * t;
|
||
|
||
case InterpolationCurve::EaseOut:
|
||
return t * (2.0f - t);
|
||
|
||
case InterpolationCurve::EaseInOut:
|
||
if (t < 0.5f)
|
||
return 2.0f * t * t;
|
||
else
|
||
return -1.0f + (4.0f - 2.0f * t) * t;
|
||
}
|
||
|
||
return t;
|
||
}
|
||
};
|
||
|
||
} // namespace easy2d
|