public void DrawOnMe(SKSurface surface)
{
if (_currentRenderedFrame != null)
{
_currentRenderedFrame.DrawFunction(surface, _currentRenderedFrame.FramePoints);
_currentRenderedFrame = null;
}
else
{
using (var c = surface.Canvas)
{
c.Clear();
}
}
}
private async Task RestartActionBlock()
{
while (_keepLoopAlive)
{
_animationFlow = new AnimationFlow((arg) =>
{
_currentRenderedFrame = arg;
_currentDisplay.SignalRedraw();
}, _uiTaskScheduler);
if (_shouldStartRandomAnim)
{
_animationFlow.StartRandomAnimationsLoop(_randomAnimationTime);
//only start one at a time
_shouldStartRandomAnim = false;
}
var completionTask = await Task.WhenAny(_animationFlow.CompletionTask);
var message = "Animation Loop Has Closed: it ";
switch (completionTask.Status)
{
case TaskStatus.RanToCompletion:
message += "ran to completion";
break;
case TaskStatus.Canceled:
message += "was canceled";
break;
case TaskStatus.Faulted:
message += "has faulted";
Debug.WriteLine(completionTask.Exception.InnerException.InnerException.InnerException);
break;
}
Debug.WriteLine("\n" + message);
}
}
public AnimationFlow(Action <RenderedFrame> notifyFrameReady, TaskScheduler uiScheduler) : base(DataflowOptions.Default)
{
_animations = new CurrentAnimationsBlock();
_frameQueue = new FrameQueueBlock <AnimationBase[]>(new ExecutionDataflowBlockOptions {
MaxDegreeOfParallelism = Environment.ProcessorCount
});
_renderFrame = new TransformBlock <AnimationBase[], RenderedFrame>((arg) =>
{
var animFrame = new List <HashSet <AnimatedPoint> >();
foreach (var anim in arg)
{
if (!anim.IsSetup)
{
anim.SetupAnimation();
}
HashSet <AnimatedPoint> x = new HashSet <AnimatedPoint>();
//dont render a frame that won't be drawn
if (anim.CurrentFrame <= anim.NumFrames)
{
x = anim.RenderFrame(anim.CurrentFrame);
}
animFrame.Add(x);
}
//allows any derived draw function
//newest animation determines how all current animations will be drawn
var rend = new RenderedFrame(arg[arg.Length - 1].DrawPointFrame);
//no use in "combining" animations unless there is more than 1 anim for this frame
if (animFrame.Count > 1)
{
var dict = new Dictionary <SKPoint, AnimatedPoint>();
//for each animation render for this frame
foreach (var frame in animFrame)
{
//for each point changed in the rendered animation
foreach (var pointChange in frame)
{
//if point has been previously animated, update it
if (dict.ContainsKey(pointChange.Point))
{
dict[pointChange.Point].XDisplacement += pointChange.XDisplacement;
dict[pointChange.Point].YDisplacement += pointChange.YDisplacement;
}
//or add it
else
{
dict[pointChange.Point] = pointChange;
}
}
}
//check each point after its duplicates have been accumulated
foreach (var point in dict.Values)
{
var p = dict[point.Point];
//only want to limit to max displacement if it has been specified
if (p.LimitDisplacement)
{
if (Math.Abs(p.XDisplacement) > p.MaxXDisplacement)
{
var oldDisp = p.XDisplacement;
p.XDisplacement = p.MaxXDisplacement;
if (oldDisp < 0)
{
p.XDisplacement *= -1;
}
}
if (Math.Abs(p.YDisplacement) > p.MaxYDisplacement)
{
var oldDisp = p.YDisplacement;
p.YDisplacement = p.MaxYDisplacement;
if (oldDisp < 0)
{
p.YDisplacement *= -1;
}
}
}
}
rend.FramePoints = dict.Values.ToList();
}
else
{
rend.FramePoints = animFrame[0].ToList();
}
_animations.FrameRendered();
return(rend);
}, new ExecutionDataflowBlockOptions {
MaxDegreeOfParallelism = Environment.ProcessorCount
});
//limit parallelism so that only one redraw update can occur
_signalFrameRendered = new ActionBlock <RenderedFrame>(notifyFrameReady, new ExecutionDataflowBlockOptions {
MaxDegreeOfParallelism = 1, TaskScheduler = uiScheduler
});
_animations.LinkTo(_frameQueue, new DataflowLinkOptions {
PropagateCompletion = true
});
_frameQueue.LinkTo(_renderFrame, new DataflowLinkOptions {
PropagateCompletion = true
});
_renderFrame.LinkTo(_signalFrameRendered, new DataflowLinkOptions {
PropagateCompletion = true
});
RegisterChild(_animations);
RegisterChild(_frameQueue);
RegisterChild(_renderFrame);
RegisterChild(_signalFrameRendered);
}