Circle class

A circle defined by a center point and a radius.

Implements Shape with area (pir^2) and perimeter (2pi*r). Supports containment checks, intersection with lines and other circles, and tangent line computation.

final c = Circle(center: Point(0, 0), radius: 5);
print(c.area);       // ~78.54
print(c.contains(Point(1, 1))); // true
Implemented types

Constructors

Circle({required double radius, required Point center})
Creates a circle with given radius and center.
const

Properties

area → double
Get area of circle
no setteroverride
center → Point
Center point of this circle.
final
circumference → double
Circumference of this circle (alias for perimeter)
no setter
diameter → double
Diameter of this circle
no setter
hashCode → int
The hash code for this object.
no setteroverride
perimeter → double
Get perimeter of circle
no setteroverride
radius → double
Radius of this circle.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

contains(Point point) → bool
Check if a point is inside this circle (alias for hasPoint)
distanceTo(Point point) → double
Shortest distance from circle boundary to point
getCircleIntersections(Circle other) → List<Point>
Get intersection points of this circle with other
getLineIntersections(Line line) → List<Point>
Get intersection points of a line segment with this circle
hasPoint(Point point) → bool
Check if a given point is inside of this circle
intersectsCircle(Circle other) → bool
Check if this circle overlaps with other
intersectsLine(Line line) → bool
Check if a line segment intersects this circle
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
rotate(double deg) → Circle
Rotate the circle by deg degrees.
override
scale(double value) → Circle
Scale the circle by value, scaling both radius and center.
override
tangentAt(Point point) → Line
Get tangent line at point on boundary
toString() → String
A string representation of this object.
inherited
translate({double x = 0, double y = 0}) → Circle
Translate the circle by x horizontally and y vertically.
override

Operators

operator ==(Object other) → bool
The equality operator.
override