# Rectangle<T extends num>.fromPoints constructor Null safety

Rectangle<T extends num>.fromPoints(
1. Point<T> a,
2. Point<T> b
)

Create a rectangle spanned by the points `a` and `b`;

The rectangle contains the points with x-coordinate between `a.x` and `b.x`, and with y-coordinate between `a.y` and `b.y`, both inclusive.

If the distance between `a.x` and `b.x` is not representable (which can happen if one or both is a double), the actual right edge might be slightly off from `max(a.x, b.x)`. Similar for the y-coordinates and the bottom edge.

Example:

``````var leftTop = const Point(20, 50);
var rightBottom = const Point(300, 600);

var rectangle = Rectangle.fromPoints(leftTop, rightBottom);
print(rectangle); // Rectangle (20, 50) 280 x 550
print(rectangle.left); // 20
print(rectangle.top); // 50
print(rectangle.right); // 300
print(rectangle.bottom); // 600
``````

## Implementation

``````factory Rectangle.fromPoints(Point<T> a, Point<T> b) {
T left = min(a.x, b.x);
T width = (max(a.x, b.x) - left) as T;
T top = min(a.y, b.y);
T height = (max(a.y, b.y) - top) as T;
return Rectangle<T>(left, top, width, height);
}``````