JavaFX - 平移變換



平移變換將物件移動到螢幕上的不同位置。可以透過將平移座標 (tx, ty) 新增到原始座標 (X, Y) 來平移二維點,從而得到新的座標 (X’, Y’)。

Translation

示例

以下程式演示了 JavaFX 中的平移變換。這裡,我們建立了兩個在相同位置、具有相同尺寸但顏色不同的圓形(節點),顏色分別為棕色和海藍色。我們還在海藍色的圓形上應用了平移變換。

將此程式碼儲存到名為 **TranslationExample.java** 的檔案中。

import javafx.application.Application; 
import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.scene.paint.Color; 
import javafx.scene.shape.Circle; 
import javafx.scene.transform.Translate; 
import javafx.stage.Stage;  

public class TranslationExample extends Application { 
   @Override 
   public void start(Stage stage) {      
      //Drawing Circle1 
      Circle circle = new Circle(); 
      
      //Setting the position of the circle 
      circle.setCenterX(150.0f); 
      circle.setCenterY(135.0f); 
      
      //Setting the radius of the circle 
      circle.setRadius(100.0f); 
      
      //Setting the color of the circle 
      circle.setFill(Color.BROWN); 
      
      //Setting the stroke width of the circle 
      circle.setStrokeWidth(20); 
       
      //Drawing Circle2 
      Circle circle2 = new Circle(); 
      
      //Setting the position of the circle 
      circle2.setCenterX(150.0f); 
      circle2.setCenterY(135.0f); 
      
      //Setting the radius of the circle 
      circle2.setRadius(100.0f); 
      
      //Setting the color of the circle 
      circle2.setFill(Color.CADETBLUE); 
      
      //Setting the stroke width of the circle 
      circle2.setStrokeWidth(20); 
       
      //Creating the translation transformation 
      Translate translate = new Translate();       
      
      //Setting the X,Y,Z coordinates to apply the translation 
      translate.setX(300); 
      translate.setY(50); 
      translate.setZ(100);  
      
      //Adding transformation to circle2 
      circle2.getTransforms().addAll(translate); 
       
      //Creating a Group object  
      Group root = new Group(circle,circle2); 
         
      //Creating a scene object 
      Scene scene = new Scene(root, 600, 300);  
      
      //Setting title to the Stage 
      stage.setTitle("Translation transformation example"); 
         
      //Adding scene to the stage 
      stage.setScene(scene); 
         
      //Displaying the contents of the stage 
      stage.show(); 
   }
   public static void main(String args[]){ 
      launch(args); 
   } 
} 

使用以下命令在命令提示符下編譯並執行儲存的 Java 檔案。

javac TranslationExample.java 
java TranslationExample 

執行後,上述程式將生成如下所示的 JavaFX 視窗。

Translate Transformation
javafx_transformations.htm
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