private AnimKeyFrame[] GetTranslationArray(int start, int count, int type)
{
AnimKeyFrame[] dat = new AnimKeyFrame[count];//array of keyframes
int ptr = start;
int c = 0;
while (c < count)
{
dat[c] = new AnimKeyFrame();
if (count > 1)
{
dat[c].time = translations[ptr++];
dat[c].value = translations[ptr++];
dat[c].tangent_in = translations[ptr++];
dat[c].tangent_out = (type == 0 ? translations[ptr - 1] : translations[ptr++]);
}
else
{
dat[c].value = translations[ptr++];
}
c++;
}
return(dat);
}
private AnimKeyFrame[] GetRotationArray(int start, int count, int type)
{
int size = (type == 0 ? 3 : 4);
AnimKeyFrame[] dat = new AnimKeyFrame[count];
int ptr = start;
int c = 0;
while (c < count)
{
dat[c] = new AnimKeyFrame();
if (count > 1)
{
dat[c].time = rotations[ptr++];
dat[c].value = rotations[ptr++] * anglescale;
dat[c].tangent_in = rotations[ptr++];
dat[c].tangent_out = (type == 0 ? rotations[ptr - 1] : rotations[ptr++]);
}
else
{
dat[c].value = rotations[ptr++];
}
c++;
}
return(dat);
}
private static float GetDurationOfKeyFrameList(List <AnimKeyFrame> list)
{
AnimKeyFrame prev = new AnimKeyFrame();
for (int i = 0; i < list.Count; i++)
{
if (list[i].time >= prev.time)
{
prev = list[i];
}
}
return(prev.time);
}
private static float InterpolateKeyFrameList(List <AnimKeyFrame> list, float time, InterpolationType type = InterpolationType.Linear)
{
AnimKeyFrame prev = null;
AnimKeyFrame after = null;
for (int i = 0; i < list.Count; i++)
{
if ((prev == null || list[i].time >= prev.time) && list[i].time <= time)
{
prev = list[i];
}
if ((after == null || list[i].time <= after.time) && list[i].time >= time)
{
after = list[i];
//We can't break here; the list isn't necessarily ordered by time.
}
}
if (after == null && prev == null)//this shouldn't happen
{
after = prev = new AnimKeyFrame();
}
else if (after == null)
{
after = prev;
}
else if (prev == null)
{
prev = after;
}
switch (type)
{
case InterpolationType.Linear:
if (prev.time != after.time)
{
float fracx = (time - prev.time) / (after.time - prev.time);
return(((1 - fracx) * prev.value) + (fracx * after.value));
}
else
{
return(prev.value);
}
case InterpolationType.Cubic:
if (prev.time != after.time)
{
float FramesBetweenKeys = prev.time - after.time;
float fracx = (time - prev.time) / FramesBetweenKeys;
return((2 * prev.value - 2 * after.value + prev.tangent_out * FramesBetweenKeys + after.tangent_in * FramesBetweenKeys) * fracx * fracx * fracx
+ (3 * after.value - 3 * prev.value - after.tangent_in * FramesBetweenKeys - 2 * prev.tangent_out * FramesBetweenKeys) * fracx * fracx
+ (prev.tangent_out * FramesBetweenKeys) * fracx
+ prev.value);//hermite in one step. It's jank but it works so whatevs. This curve is created over the domain 0,1 hence why we scale the derivatives and use fracx.
}
else
{
return(prev.value);
}
default:
throw new Exception("Bck: Unknown interpolation type");
}
}