如何使用两个PointF创建一个RectangleF？

Question

我创建了两个点,就像一条线.我想将其转换为矩形.我该怎么办？

例如,这是我画线的方式.但我希望它是一个Rectangle

    private PointF start, end;
    protected override void OnMouseDown(MouseEventArgs e)
    {
        start.X = e.X;
        start.Y = e.Y;
    }

    protected override void OnMouseUp(MouseEventArgs e)
    {
        end.X = e.X;
        end.Y = e.Y;

        Invalidate();
    }

Answer 1

怎么样:

new RectangleF(Math.Min(start.X, end.X),
               Math.Min(start.Y, end.Y),
               Math.Abs(start.X - end.X),
               Math.Abs(start.Y - end.Y));

基本上,这确保您确实将左上角显示为"开始",即使用户已经从左下角到右上角创建了一条线.

Answer 2

使用FromLTRB的Jon答案的更清晰版本：

    /// <summary>
    /// Creates a rectangle based on two points.
    /// </summary>
    /// <param name="p1">Point 1</param>
    /// <param name="p2">Point 2</param>
    /// <returns>Rectangle</returns>
    public static RectangleF GetRectangle(PointF p1, PointF p2)
    {
        float top = Math.Min(p1.Y, p2.Y);
        float bottom = Math.Max(p1.Y, p2.Y);
        float left = Math.Min(p1.X, p2.X);
        float right = Math.Max(p1.X, p2.X);

        RectangleF rect = RectangleF.FromLTRB(left, top, right, bottom);

        return rect;
    }