/// <summary>
/// Performs the animation specified in the options
/// </summary>
/// <param name="options">animation options</param>
/// <returns>an async task</returns>
public static async Task AnimateAsync(AnimatorOptions options)
{
if (options.DelayProvider == null && Time.CurrentTime != null)
{
options.DelayProvider = Time.CurrentTime;
}
else if (options.DelayProvider == null)
{
options.DelayProvider = new WallClockDelayProvider();
}
var originalFrom = options.From;
var originalTo = options.To;
try
{
var i = 0;
while (i == 0 || (options.Loop != null && options.Loop.IsExpired == false))
{
i++;
await AnimateAsyncInternal(options);
if (options.AutoReverse)
{
if (options.AutoReverseDelay > 0)
{
await options.DelayProvider.DelayAsync(TimeSpan.FromMilliseconds(options.AutoReverseDelay));
}
var temp = options.From;
options.From = options.To;
options.To = temp;
options.OnReversedChanged?.Invoke(true);
await AnimateAsyncInternal(options);
if (options.AutoReverseDelay > 0)
{
await options.DelayProvider.DelayAsync(TimeSpan.FromMilliseconds(options.AutoReverseDelay));
}
options.From = originalFrom;
options.To = originalTo;
options.OnReversedChanged?.Invoke(false);
}
}
}
finally
{
options.From = originalFrom;
options.To = originalTo;
}
}
private static async Task AnimateAsyncInternal(AnimatorOptions options)
{
var animationTime = TimeSpan.FromMilliseconds(options.Duration);
if (animationTime == TimeSpan.Zero)
{
#if DEBUG
options.Debug?.Invoke("NoOp animation");
#endif
options.Set(options.To);
}
var numberOfFrames = (float)(ConsoleMath.Round(animationTime.TotalSeconds * TargetFramesPerSecond));
numberOfFrames = Math.Max(numberOfFrames, 2);
#if DEBUG
options.Debug?.Invoke($"Frames: {numberOfFrames}");
#endif
var timeBetweenFrames = TimeSpan.FromMilliseconds(ConsoleMath.Round(animationTime.TotalMilliseconds / numberOfFrames));
#if DEBUG
options.Debug?.Invoke($"Time between frames: {timeBetweenFrames.TotalMilliseconds} ms");
#endif
var initialValue = options.From;
options.Set(initialValue);
#if DEBUG
options.Debug?.Invoke($"InitialValue: {initialValue}");
#endif
var delta = options.To - initialValue;
#if DEBUG
options.Debug?.Invoke($"Delta: {delta}");
#endif
var workSw = Stopwatch.StartNew();
for (float i = 1; i <= numberOfFrames; i++)
{
var percentageDone = i / numberOfFrames;
if (options.EasingFunction != null)
{
percentageDone = options.EasingFunction(percentageDone);
}
var scheduledTimeAfterThisFrame = TimeSpan.FromMilliseconds(timeBetweenFrames.TotalMilliseconds * i);
var newValue = initialValue + (delta * percentageDone);
options.OnSet?.Invoke(percentageDone);
options.Set(newValue);
#if DEBUG
options.Debug?.Invoke($"Set value to {newValue} at percentage {percentageDone}");
#endif
var delayTime = options.DelayProvider is WallClockDelayProvider?TimeSpan.FromMilliseconds(Math.Max(0, scheduledTimeAfterThisFrame.TotalMilliseconds - workSw.Elapsed.TotalMilliseconds)) : timeBetweenFrames;
#if DEBUG
options.Debug?.Invoke($"Delayed for {delayTime.TotalMilliseconds} ms at percentage {percentageDone}");
#endif
if (options.IsCancelled != null && options.IsCancelled())
{
return;
}
if (delayTime == TimeSpan.Zero)
{
await options.YieldAsync();
}
else
{
await options.DelayAsync(delayTime);
}
}
}
