JavaFX 類 Insets用法及代碼示例

Insets 類是 JavaFX 的一部分。 Insets 類存儲矩形區域四個邊的內部偏移量。 Insets 類繼承 java.lang.Object 類。

類的構造函數：

1. Insets(double a)：為所有四個偏移量構造一個具有相同值的新 Insets 實例。
2. Insets(double top, double right, double bottom, double left):構造一個具有四個不同偏移量的新 Insets 實例。

常用方法：

下麵的程序將說明 Insets 類的使用：

1. Java 程序創建兩個 insets 對象並顯示內容：該程序創建了兩個名為 insets_1 和 insets_2 的插圖。調用構造函數時，插入作為參數傳遞。我們將使用 getTop()、getBottom()、getLeft()、getRight() 函數獲取 insets 對象的四個邊並顯示它們。

   
   // Java program to create two insets 
   // object and display the contents
   import javafx.geometry.Insets;
     
   public class Insets_1 {
     
       // Main Method
       public static void main(String args[])
       {
             
           // create two insets object
           Insets insets_1 = new Insets(20.0f);
           Insets insets_2 = new Insets(20.0f, 40.0f, 60.0f, 70.0f);
     
           // display the insets
           display(insets_1);
           display(insets_2);
       }
         
       // display method
       public static void display(Insets insets)
       {
           double left, right, bottom, top;
     
           // get the insets
           left = insets.getLeft();
           right = insets.getRight();
           bottom = insets.getBottom();
           top = insets.getTop();
     
           // display the insets
           System.out.println("Insets of the object");
           System.out.println("Left= " + left + ", Right = " 
                              + right + ", Bottom = " + bottom 
                              + ", Top = " + top);
       }
   }

   輸出：

   
   
   

   Insets of the object
   Left = 20.0, Right = 20.0, Bottom = 20.0, Top = 20.0
   Insets of the object
   Left = 70.0, Right = 40.0, Bottom = 60.0, Top = 20.0
   

2. Java 程序創建三個 insets 對象並顯示其內容並檢查它們是否彼此相等：該程序創建了三個名為 insets_1、insets_2 和 insets_3 的插圖。調用構造函數時，插入作為參數傳遞。我們將使用 getTop()、getBottom()、getLeft()、getRight() 函數獲取 insets 對象的四個邊並顯示它們。我們還將使用 equals 函數檢查插入是否彼此相等。

   
   // Java program to create three objects of insets
   // and display its contents and check whether 
   // they are equal to each other or not
   import javafx.geometry.Insets;
     
   public class Insets_2 {
     
       // Main Method
       public static void main(String args[])
       {
             
           // create three insets objects
           Insets insets_1 = new Insets(120.0f, 150.0f,
                                         40.0f, 60.0f);
                                           
           Insets insets_2 = new Insets(120.0f, 150.0f, 
                                          40.0f, 60.0f);
                                            
           Insets insets_3 = new Insets(200.0f, 120.0f, 
                                         60.0f, 40.0f);
     
           // display the 3 insets
           display(insets_1);
           display(insets_2);
           display(insets_3);
     
           // check whether any insets is equal to other or not
           System.out.println("Insets 1 equals Insets 2 = " 
                              + insets_1.equals(insets_2));
                                
           System.out.println("Insets 2 equals Insets 3 = " 
                               + insets_2.equals(insets_3));
                                 
           System.out.println("Insets 3 equals Insets 1 = " 
                               + insets_3.equals(insets_1));
       }
     
       // display Method
       public static void display(Insets insets)
       {
           double left, right, bottom, top;
     
           // get the insets
           left = insets.getLeft();
           right = insets.getRight();
           bottom = insets.getBottom();
           top = insets.getTop();
     
           // display the insets
           System.out.println("Insets of the object");
           System.out.println("Left= " + left + ", Right= "
                              + right + ", Bottom= " + bottom 
                              + ", Top = " + top);
       }
   }

   輸出：

   Insets of the object
   Left= 60.0, Right= 150.0, Bottom= 40.0, Top = 120.0
   Insets of the object
   Left= 60.0, Right= 150.0, Bottom= 40.0, Top = 120.0
   Insets of the object
   Left= 40.0, Right= 120.0, Bottom= 60.0, Top = 200.0
   Insets 1 equals Insets 2 = true
   Insets 2 equals Insets 3 = false
   Insets 3 equals Insets 1 = false
   

注意：上述程序可能無法在在線 IDE 中運行。請使用離線編譯器。

參考：https://docs.oracle.com/javafx/2/api/javafx/geometry/Insets.html