private float GetRestLength(Path path, float startD)
{
Path tempPath = new Path();
PathMeasure pathMeasure = new PathMeasure(path, false);
pathMeasure.GetSegment(startD, pathMeasure.Length, tempPath, true);
pathMeasure.SetPath(tempPath, false);
return(pathMeasure.Length);
}
internal static void ApplyTrimPathIfNeeded(Path path, float startValue, float endValue, float offsetValue)
{
LottieLog.BeginSection("applyTrimPathIfNeeded");
PathMeasure.SetPath(path);
var length = PathMeasure.Length;
if (startValue == 1f && endValue == 0f)
{
LottieLog.EndSection("applyTrimPathIfNeeded");
return;
}
if (length < 1f || Math.Abs(endValue - startValue - 1) < .01)
{
LottieLog.EndSection("applyTrimPathIfNeeded");
return;
}
var start = length * startValue;
var end = length * endValue;
var newStart = Math.Min(start, end);
var newEnd = Math.Max(start, end);
var offset = offsetValue * length;
newStart += offset;
newEnd += offset;
// If the trim path has rotated around the path, we need to shift it back.
if (newStart >= length && newEnd >= length)
{
newStart = MiscUtils.FloorMod(newStart, length);
newEnd = MiscUtils.FloorMod(newEnd, length);
}
if (newStart < 0)
{
newStart = MiscUtils.FloorMod(newStart, length);
}
if (newEnd < 0)
{
newEnd = MiscUtils.FloorMod(newEnd, length);
}
// If the start and end are equals, return an empty path.
if (newStart == newEnd)
{
path.Reset();
LottieLog.EndSection("applyTrimPathIfNeeded");
return;
}
if (newStart >= newEnd)
{
newStart -= length;
}
_tempPath.Reset();
PathMeasure.GetSegment(newStart, newEnd, ref _tempPath, true);
if (newEnd > length)
{
_tempPath2.Reset();
PathMeasure.GetSegment(0, newEnd % length, ref _tempPath2, true);
_tempPath.AddPath(_tempPath2);
}
else if (newStart < 0)
{
_tempPath2.Reset();
PathMeasure.GetSegment(length + newStart, length, ref _tempPath2, true);
_tempPath.AddPath(_tempPath2);
}
path.Set(_tempPath);
LottieLog.EndSection("applyTrimPathIfNeeded");
}