Point class
A utility class for representing two-dimensional positions.
class Point {
final num x;
final num y;
const Point([num x = 0, num y = 0]): x = x, y = y;
String toString() => '($x, $y)';
bool operator ==(other) {
if (other is !Point) return false;
return x == other.x && y == other.y;
}
Point operator +(Point other) {
return new Point(x + other.x, y + other.y);
}
Point operator -(Point other) {
return new Point(x - other.x, y - other.y);
}
Point operator *(num factor) {
return new Point(x * factor, y * factor);
}
/**
* Returns the distance between two points.
*/
double distanceTo(Point other) {
var dx = x - other.x;
var dy = y - other.y;
return sqrt(dx * dx + dy * dy);
}
/**
* Returns the squared distance between two points.
*
* Squared distances can be used for comparisons when the actual value is not
* required.
*/
num squaredDistanceTo(Point other) {
var dx = x - other.x;
var dy = y - other.y;
return dx * dx + dy * dy;
}
Point ceil() => new Point(x.ceil(), y.ceil());
Point floor() => new Point(x.floor(), y.floor());
Point round() => new Point(x.round(), y.round());
/**
* Truncates x and y to integers and returns the result as a new point.
*/
Point toInt() => new Point(x.toInt(), y.toInt());
}
Constructors
Operators
Point operator +(Point other) #
Point operator +(Point other) {
return new Point(x + other.x, y + other.y);
}
Point operator -(Point other) #
Point operator -(Point other) {
return new Point(x - other.x, y - other.y);
}
Point operator *(num factor) #
Point operator *(num factor) {
return new Point(x * factor, y * factor);
}
bool operator ==(other) #
The equality operator.
The default behavior for all Objects is to return true if and
only if this and
other are the same object.
If a subclass overrides the equality operator it should override
the hashCode method as well to maintain consistency.
docs inherited from Object
bool operator ==(other) {
if (other is !Point) return false;
return x == other.x && y == other.y;
}
Methods
double distanceTo(Point other) #
Returns the distance between two points.
double distanceTo(Point other) {
var dx = x - other.x;
var dy = y - other.y;
return sqrt(dx * dx + dy * dy);
}
num squaredDistanceTo(Point other) #
Returns the squared distance between two points.
Squared distances can be used for comparisons when the actual value is not required.
num squaredDistanceTo(Point other) {
var dx = x - other.x;
var dy = y - other.y;
return dx * dx + dy * dy;
}