void readCurve(CurveTimeline timeline, int frameIndex, JsonValue valueMap) {
JsonValue curve = valueMap.get("curve");
if (curve == null) return;
if (curve.isString() && curve.asString().equals("stepped")) timeline.setStepped(frameIndex);
else if (curve.isArray()) {
timeline.setCurve(
frameIndex, curve.getFloat(0), curve.getFloat(1), curve.getFloat(2), curve.getFloat(3));
}
}
void setCurve(
CurveTimeline timeline, int frameIndex, float cx1, float cy1, float cx2, float cy2) {
timeline.setCurve(frameIndex, cx1, cy1, cx2, cy2);
}