# Pixelshift
Stuff that relate to checking the "pixelshift", ie how many pixels changed in an area


- - -

## SRL.GetPixelShiftTPA
```pascal
function TSRL.GetPixelShiftTPA(Area: TBox; WaitTime: UInt32; Count: Int32=1; AcceptLength:Int32=0): TPointArray;
```

Returns a TPA containing all the pixels that changed during the ``WaitTime`` period.

The function can repeat the period ``WaitTime`` and continue building the result ``Count`` times.

if ``AcceptLength`` is none-zero, it will return when / if this many pixels has changed.


- - -

## SRL.IsAnimating
```pascal
function TSRL.IsAnimating(Area:TBox; Shift, WaitTime:UInt32; Iter:UInt32=1): Boolean;
```
Counts the pixels that changed in the period ``WaitTime`` and checks if ``Shift`` value was met if it was
the it will return ``True``. The check itself can be repeated several times ``Iter``

Example:
```pascal
if srl.IsAnimating(Box(10,10, 100,100), 350, 500, 3) then
  WriteLn('Shit changed');
```

In the example above, we supply a random area, and checks if 350 pixels changed within 500ms, we repeat
that test 3 times, or until the condition `350 pixels` was met.
```