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tween: pre/post-delay support, StaticTween helper

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Sebastian Krzyszkowiak 2018-11-17 12:06:05 +01:00
parent 4754d8dd4e
commit 9d9d23dfe8
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GPG key ID: E8F235CF3BDBC3FF
2 changed files with 21 additions and 1 deletions
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20
src/tween.c
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@ -253,10 +253,16 @@ SYMBOL_EXPORT struct Tween Tween(struct Game* game, double start, double stop, T
.paused = false,
.game = game,
.done = false,
.predelay = 0,
.postdelay = 0,
.callback = NULL,
.data = NULL};
}
SYMBOL_EXPORT struct Tween StaticTween(struct Game* game, double value) {
return Tween(game, value, value, TWEEN_STYLE_LINEAR, 0);
}
SYMBOL_EXPORT double GetTweenPosition(struct Tween* tween) {
if (tween->duration == 0.0) {
return 1.0;
@ -348,10 +354,22 @@ SYMBOL_EXPORT double GetTweenValue(struct Tween* tween) {
SYMBOL_EXPORT void UpdateTween(struct Tween* tween, double delta) {
if (tween->paused) { return; }
if (tween->predelay) {
tween->predelay -= delta;
if (tween->predelay > 0) {
return;
} else if (tween->predelay < 0) {
delta = -tween->predelay;
tween->predelay = 0;
}
}
tween->pos += delta;
if (tween->pos > tween->duration) {
tween->pos = tween->duration;
if (!tween->done) {
if (tween->postdelay) {
tween->postdelay -= delta;
}
if ((tween->postdelay <= 0) && (!tween->done)) {
tween->done = true;
if (tween->callback) {
tween->callback(tween->game, tween, tween->data);

2
src/tween.h
View file

@ -71,6 +71,7 @@ typedef enum TWEEN_STYLE {
struct Tween {
double start, stop;
double duration, pos;
double predelay, postdelay;
TWEEN_STYLE style;
bool paused;
bool done;
@ -80,6 +81,7 @@ struct Tween {
};
struct Tween Tween(struct Game* game, double start, double stop, TWEEN_STYLE style, double duration);
struct Tween StaticTween(struct Game* game, double value);
double GetTweenPosition(struct Tween* tween);
double GetTweenInterpolation(struct Tween* tween);
double GetTweenValue(struct Tween* tween);