description

# Rectangle<T extends num> constructor Null safety

const Rectangle<T extends num>(

1. T left,
2. T top,
3. T width,
4. 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)
        : width = (width < 0)
              ? (-width * 0) as dynamic
              : width, // Inline _clampToZero<num>.
          height = (height < 0) ? (-height * 0) as dynamic : height;