如何知道矩形和菱形的中心C＃ [英] how to know center of rectangle and rhombus C#

问题描述

 if (shapeChecker.IsCircle(edgePoints, out center, out radius))
{
    g.DrawEllipse(yellowPen, (float)(center.X - radius), (float)  (center.Y - radius),
       (float)(radius * 2), (float)(radius * 2));
    circleCount++;
    label2.Text = String.Format("Centre Location X:{0}, Y:{1} ",
    center.X, center.Y);
    label3.Text = String.Format("Radius : {0} ", radius);
    x = (int)center.X;
    y = (int)center.Y;
    timer2.Enabled = true;
}

//is Rhombus
else if (shapeChecker.IsConvexPolygon(edgePoints, out corners))
{
    if (shapeChecker.CheckPolygonSubType(corners) == PolygonSubType.Rhombus)
    {
        rhombusCount++;                            
        g.DrawPolygon(bluePen, ToPointsArray(corners));
       //How to know center rhombus??
    }
}

//is rectangle
if (shapeChecker.IsQuadrilateral(edgePoints, out corners))
{
    if (shapeChecker.CheckPolygonSubType(corners) == PolygonSubType.Rectangle)
    {   
        rectangularCount++;                                    
        g.DrawPolygon(redPen, ToPointsArray(corners));
        //How to know center rectangle
    }   
}

推荐答案

菱形的中心是边界矩形的中心：

The centre of a rhombus is the centre of the bounding rectangle:

 _  _______
|  /      /
| /      /
 /      /  |
/______/ __|

这是微不足道的：

And that's trivial:

/// <summary>
/// Returns the center point of the rectangle
/// </summary>
/// <param name="r"></param>
/// <returns>Center point of the rectangle</returns>
public static Point Center(this Rectangle r)
    {
    return new Point((r.Left + r.Right) / 2, (r.Top + r.Bottom) / 2);
    }

（来自NaibedyaKar在上面的评论中提供的链接 - 自从我写了小费以来，我可以将它复制到我想要的所有内容！：笑:)：



计算边界矩形也不困难:( smallestX，smallestY），（maximumX，largestY）分别是TLHC和BRHC。

(From the link supplied by NaibedyaKar in the comments above - since I wrote the tip, I can copy it all I want! :laugh: )

Working out the bounding rectangle isn't difficult either: (smallestX, smallestY), (largestX, largestY) are the TLHC and BRHC respectively.

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