如何將隨機繪製的矩形垂直堆疊在一起？

Question

我想獲得隨機繪製的矩形排列在窗體上彼此相鄰，但我的循環不工作，給我不想要的結果，任何幫助將不勝感激。

我已經創建了一個創建隨機矩形然後將它們存儲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

你的第二個foreach看起來太複雜了。我不認爲你真的需要PrevRecX。試試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 += 
    } 
} 

對於static Random，只是申報方式外的變量，並使用它裏面，這樣的：

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); 

    // ... 
}