description

# Rectangle<T extends num> constructor

const Rectangle<T extends num>(T left, T top, T width, T height)

Create a rectangle spanned by `(left, top)` and `(left+width, top+height)`.

The rectangle contains the points with x-coordinate between `left` and `left + width`, and with y-coordinate between `top` and `top + height`, both inclusive.

The `width` and `height` should be non-negative. If `width` or `height` are negative, they are clamped to zero.

If `width` and `height` are zero, the "rectangle" comprises only the single point `(left, top)`.

## Implementation

    const Rectangle(this.left, this.top, T width, T height)
        : this.width = (width < 0) ? -width * 0 : width, // Inline _clampToZero.
          this.height = (height < 0) ? -height * 0 : height;