Polygon class

A polygon defined by an ordered list of vertices.

Implements Shape with area (shoelace formula) and perimeter. Supports containment checks (ray-casting), convexity detection, intersection with lines and circles, and centroid computation.

final hex = Polygon.regular(sides: 6, radius: 10, center: Point(0, 0));
print(hex.isConvex);  // true
print(hex.contains(Point(0, 0))); // true
Implemented types

Constructors

Polygon(List<Point> vertices)
Creates a polygon from an ordered list of vertices.
const
Polygon.regular({required int sides, required double radius, required Point center})
Create a regular polygon with sides sides, inscribed in a circle of radius centered at center.
factory

Properties

area → double
Area of this polygon using the shoelace formula.
no setteroverride
bottomPoint → Point
Get the furthest bottom point of the polygon
no setter
centroid → Point
Centroid of this polygon (alias for getInnerCentroid)
no setter
edges → List<Line>
Get all edges of this polygon
no setter
hashCode → int
The hash code for this object.
no setterinherited
isClockwise → bool
Whether vertices are in clockwise winding order
no setter
isConvex → bool
Whether this polygon is convex
no setter
mostLeftPoint → Point
Get the furthest left point of the polygon
no setter
mostRightPoint → Point
Get the furthest right point of the polygon
no setter
perimeter → double
Perimeter of this polygon (sum of all edge lengths).
no setteroverride
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
topPoint → Point
Get the furthest top point of the polygon
no setter
vertices → List<Point>
Ordered list of vertices.
final

Methods

contains(Point point) → bool
Check if a point is inside this polygon
getBound() → Polygon
Get all the boundary of the polygon
getCircumCentroid() → Point
Get the centroid of Outer circle
getCircumCircle(List<Point> list) → Circle
Get the outer circle
getClosestVertex(Point point) → Point
Get closest vertex to the point
getClosetVertex(Point point) → Point
Get closet vertex to the point
getFurthestVertex(Point point) → Point
Get furthest vertex to the point
getInnerCentroid() → Point
Get the centroid of inner circle
getInnerCircle() → Circle
Get the outer circle
intersectsCircle(Circle circle) → bool
Check if a circle intersects this polygon
intersectsLine(Line line) → bool
Check if a line segment intersects this polygon
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
rotate(double deg) → Polygon
Rotate all vertices by deg degrees around the origin.
override
scale(double value) → Polygon
Scale all vertices by value.
override
toString() → String
A string representation of this object.
inherited
translate({double x = 0, double y = 0}) → Polygon
Translate all vertices by x horizontally and y vertically.
override

Operators

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