private static void SmoothLocalInterpolation(BezierKeyframe previous, float previousTime, ref BezierKeyframe current, BezierKeyframe next, float nextTime)
{
if (next.HasValue() && previous.HasValue())
{
var inHandle = (current.value - previous.value) / 3f;
var outHandle = (next.value - current.value) / 3f;
var bothSegmentsDuration = nextTime - previousTime;
var inRatio = (current.time - previousTime) / bothSegmentsDuration;
var outRatio = (nextTime - current.time) / bothSegmentsDuration;
var avg = inHandle * inRatio + outHandle * outRatio;
if (inRatio > outRatio)
{
current.controlPointIn = current.value - avg;
current.controlPointOut = current.value + avg * outRatio;
}
else
{
current.controlPointIn = current.value - avg * inRatio;
current.controlPointOut = current.value + avg;
}
}
else if (previous.IsNull())
{
current.controlPointIn = current.value;
current.controlPointOut = current.value + (next.value - current.value) / 3f;
}
else if (next.IsNull())
{
current.controlPointIn = current.value - (current.value - previous.value) / 3f;
current.controlPointOut = current.value;
}
}
public static float ComputeValue(BezierKeyframe current, BezierKeyframe next, float time)
{
if (next.IsNull())
{
return(current.value);
}
var t = (time - current.time) / (next.time - current.time);
switch (current.curveType)
{
case CurveTypeValues.Constant:
return(current.value);
case CurveTypeValues.Linear:
case CurveTypeValues.FlatLinear:
{
return(current.value + (next.value - current.value) * t);
}
}
var w0 = current.value;
var w1 = current.controlPointOut;
var w2 = next.controlPointIn;
var w3 = next.value;
// See https://pomax.github.io/bezierinfo/#how-to-implement-the-weighted-basis-function
var mt = 1f - t;
var mt2 = mt * mt;
var mt3 = mt2 * mt;
var t2 = t * t;
var t3 = t2 * t;
return(w0 * mt3 + 3f * w1 * mt2 * t + 3f * w2 * mt * t2 + w3 * t3);
}
private static void SmoothLocalInterpolation(BezierKeyframe previous, float previousTime, ref BezierKeyframe current, BezierKeyframe next, float nextTime)
{
if (next.HasValue() && previous.HasValue())
{
var inHandle = (current.value - previous.value) / 3f;
var outHandle = (next.value - current.value) / 3f;
var bothSegmentsDuration = nextTime - previousTime;
var inRatio = (current.time - previousTime) / bothSegmentsDuration;
var outRatio = (nextTime - current.time) / bothSegmentsDuration;
/* // SMOOTH
* // The larger the incoming curve, the weaker the effect on the other side
* var weightedAvg = inHandle * outRatio + outHandle * inRatio;
* if (inRatio > outRatio)
* {
* current.controlPointIn = current.value - weightedAvg * (inRatio / outRatio);
* current.controlPointOut = current.value + weightedAvg;
* }
* else
* {
* current.controlPointIn = current.value - weightedAvg;
* current.controlPointOut = current.value + weightedAvg * (outRatio / inRatio);
* }
*/
// NO_OVERSHOOT
// The larger the incoming curve, the stronger the effect on the other side
var weightedAvg = inHandle * inRatio + outHandle * outRatio;
if (inRatio > outRatio)
{
current.controlPointIn = current.value - weightedAvg;
current.controlPointOut = current.value + weightedAvg * (outRatio / inRatio);
}
else
{
current.controlPointIn = current.value - weightedAvg * (inRatio / outRatio);
current.controlPointOut = current.value + weightedAvg;
}
}
else if (previous.IsNull())
{
current.controlPointIn = current.value;
current.controlPointOut = current.value + (next.value - current.value) / 3f;
}
else if (next.IsNull())
{
current.controlPointIn = current.value - (current.value - previous.value) / 3f;
current.controlPointOut = current.value;
}
}