# TCircle
TCircle related methods

type definition is found in shared/globals.simba


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## TCircle.ToTPA
```pascal
function TCircle.ToTPA(): TPointArray; constref;
```

Returns a full TPA of the circles circumference


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## TCircle.Bounds
```pascal
function TCircle.Bounds(): TBox; constref;
```

Return a TBox covering the circle


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## TCircle.Contains
```pascal
function TCircle.Contains(p: TPoint): Boolean; constref;
```

Test if the point is within the circle


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## TCircle.CircumferenceTPA
```pascal
function TCircle.CircumferenceTPA(): TPointArray; constref;
```

Alias of `.ToTPA`


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## TCircle.Mean
```pascal
function TCircle.Mean(): TPoint; constref;
```

Middle of the circle, same as `Point(Circle.X, Circle.Y)`


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## TCircle.Circumference
```pascal
function TCircle.Circumference(): Double; constref;
```

Returns the distance around the outside of a circle.


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## TCircle.Area
```pascal
function TCircle.Area(): Double; constref;
```

Returns the area the circle covers


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## TCircle.Filter
```pascal
function TCircle.Filter(TestSet: TPointArray): TPointArray; constref;
```

Extract all the points from `TestSet` that fits within this circle.


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## TCircle.Expand
```pascal
function TCircle.Expand(Inc: Int32): TCircle; constref;
```

Increase or decrease the radius of the circle, same as `Circle.Radius + Incr`.