107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
#pragma once
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#include <cmath>
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#include <animation/animation_frame.h>
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#include <core/color.h>
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#include <core/math_types.h>
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#include <core/types.h>
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namespace extra2d {
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// ============================================================================
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// 插值结果 - 两帧之间的插值后属性
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// ============================================================================
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struct InterpolatedProperties {
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Vec2 position;
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Vec2 scale = Vec2::One();
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float rotation = 0.0f;
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Color color = Colors::White;
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};
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// ============================================================================
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// 插值曲线类型
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// ============================================================================
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enum class InterpolationCurve : uint8 {
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Linear, // 线性（原始系统的 uniform velocity）
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EaseIn, // 缓入
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EaseOut, // 缓出
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EaseInOut, // 缓入缓出
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};
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// ============================================================================
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// InterpolationEngine - 帧间属性插值计算（静态方法，无状态）
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// 独立于 AnimationController，可复用于其他系统
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// ============================================================================
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class InterpolationEngine {
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public:
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/// 核心插值计算：根据 t 因子 (0~1) 计算两帧之间的插值属性
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static InterpolatedProperties
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interpolate(const AnimationFrame &from, const AnimationFrame &to, float t,
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InterpolationCurve curve = InterpolationCurve::Linear) {
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float curvedT = applyCurve(t, curve);
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InterpolatedProperties result;
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result.position = lerpPosition(from, to, curvedT);
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result.scale = lerpScale(from, to, curvedT);
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result.rotation = lerpRotation(from, to, curvedT);
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result.color = lerpColor(from, to, curvedT);
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return result;
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}
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/// 位置插值
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static Vec2 lerpPosition(const AnimationFrame &from, const AnimationFrame &to,
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float t) {
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return Vec2::lerp(from.offset, to.offset, t);
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}
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/// 缩放插值
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static Vec2 lerpScale(const AnimationFrame &from, const AnimationFrame &to,
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float t) {
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Vec2 fromScale = from.getEffectiveScale();
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Vec2 toScale = to.getEffectiveScale();
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return Vec2::lerp(fromScale, toScale, t);
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}
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/// 旋转插值
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static float lerpRotation(const AnimationFrame &from,
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const AnimationFrame &to, float t) {
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float fromRot = from.getEffectiveRotation();
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float toRot = to.getEffectiveRotation();
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return math::lerp(fromRot, toRot, t);
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}
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/// 颜色插值
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static Color lerpColor(const AnimationFrame &from, const AnimationFrame &to,
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float t) {
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Color fromColor = from.getEffectiveColor();
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Color toColor = to.getEffectiveColor();
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return Color::lerp(fromColor, toColor, t);
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}
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/// 应用曲线函数
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static float applyCurve(float t, InterpolationCurve curve) {
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t = math::clamp(t, 0.0f, 1.0f);
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switch (curve) {
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case InterpolationCurve::Linear:
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return t;
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case InterpolationCurve::EaseIn:
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return t * t;
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case InterpolationCurve::EaseOut:
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return t * (2.0f - t);
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case InterpolationCurve::EaseInOut:
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if (t < 0.5f)
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return 2.0f * t * t;
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else
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return -1.0f + (4.0f - 2.0f * t) * t;
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}
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return t;
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}
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};
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} // namespace extra2d
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