如何将随机绘制的矩形垂直堆叠在一起？

Question

我想获得随机绘制的矩形排列在窗体上彼此相邻，但我的循环不工作，给我不想要的结果，任何帮助将不胜感激。

我已经创建了一个创建随机矩形然后将它们存储在列表集合中的方法。

List<Rectangle> rectangleCollection = new List<Rectangle>(); 

    void CreateRectangle() 
    { 
     int TallestRectangle = 0; ; 
     int PrevRecX = 0; 
     int PrevRecY = 0; 

     Pen pen = new Pen(Color.Black); 
     Graphics graphic = this.CreateGraphics(); 


     foreach (Rectangle rect in rectangleCollection) 
     { 
      if (rect.Height > TallestRectangle) 
       TallestRectangle = rect.Height; 
     } 

     foreach (Rectangle rect in rectangleCollection) 
     { 
      if (PrevRecX + PrevRecY == 0) 
      { 
       graphic.DrawRectangle(pen, new Rectangle(rect.X, (TallestRectangle - rect.Height), rect.Width, rect.Height)); 
      } 
      else 
      { 
       graphic.DrawRectangle(pen, new Rectangle((PrevRecX + PrevRecY), (TallestRectangle - rect.Height), rect.Width, rect.Height)); 
      } 
      PrevRecX = rect.X; 
      PrevRecY = rect.Width; 
     } 

    } 

    void GetRandomRectangle() 
    { 
     Random ran = new Random(); 

     int x = 0; 
     int y = 0; 

     int width = ran.Next(100, 500); 
     int height = ran.Next(200, 700); 

     Rectangle rec = new Rectangle(x, y, width, height); 

     rectangleCollection.Add(rec); 
    } 

Answer 1

你的第二个foreach看起来太复杂了。我不认为你真的需要PrevRecX。试试看看它是否符合你的期望。

void CreateRectangle() 
{ 
    int TallestRectangle = 0; 
    int PrevRecY = 0; 

    Pen pen = new Pen(Color.Black); 
    Graphics graphic = this.CreateGraphics(); 

    foreach (Rectangle rect in rectangleCollection) 
    { 
    if (rect.Height > TallestRectangle) 
     TallestRectangle = rect.Height; 
    } 

    foreach (Rectangle rect in rectangleCollection) 
    { 
    graphic.DrawRectangle(pen, new Rectangle(rect.X + PrevRecY, (TallestRectangle - rect.Height), rect.Width, rect.Height)); 
    PrevRecY += rect.Width; // note the += 
    } 
} 

对于static Random，只是申报方式外的变量，并使用它里面，这样的：

private static Random ran = new Random(); 
void GetRandomRectangle() 
{ 
    int x = 0; 
    int y = 0; 

    int width = ran.Next(100, 500); 
    int height = ran.Next(200, 700); 

    // ... 
}