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LottieTweening: apply the dynamic tweening #46

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Merged
hermet merged 1 commit into from
Jul 6, 2026
Merged

LottieTweening: apply the dynamic tweening #46

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11 changes: 3 additions & 8 deletions src/LottieTweening.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -41,8 +41,6 @@ struct UserExample : tvgexam::Example
int stateIdx = 0; //current state index

struct {
float from; //tweening from frame number
float to; //tweening to frame number
float beginTime; //tweening begin time
bool active = false; //whether on-tweening or not
} tween;
Expand Down Expand Up @@ -74,19 +72,16 @@ struct UserExample : tvgexam::Example
void tweening(int stateIdx)
{
//don't allow the overlapped tweening
if (tween.active || stateIdx == this->stateIdx) return;
if (stateIdx == this->stateIdx) return;
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//reset the current state
lottie->segment(nullptr);

//tweening trigger time
tween.beginTime = timestamp();

//the current animation frame as the tweening "from" frame
tween.from = lottie->curFrame();

//the next state begin frame as the tweening "to" frame
tween.to = states[stateIdx].begin;
lottie->tweenTo(states[stateIdx].begin);

tween.active = true;

Expand Down Expand Up @@ -151,7 +146,7 @@ struct UserExample : tvgexam::Example

//perform the tweening effect
if (progress < 1.0f) {
if (lottie->tween(tween.from, tween.to, progress) == tvg::Result(0)) {
if (lottie->tween(progress) == tvg::Result(0)) {
canvas->update();
return true;
}
Expand Down
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