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📜  JavaFX-转换

📅  最后修改于: 2020-11-14 07:10:38             🧑  作者: Mango

转换意味着通过应用规则将某些图形更改为其他图形。我们可以进行各种类型的转换，例如平移，向上或向下缩放，旋转，剪切等。

使用JavaFX，您可以在节点上应用转换，例如旋转，缩放和平移。所有这些转换都由各种类表示，它们属于包javafx.scene.transform 。

S.No Transformation & Description
1 Rotation

In rotation, we rotate the object at a particular angle θ (theta) from its origin.
2 Scaling

To change the size of an object, scaling transformation is used.
3 Translation

Moves an object to a different position on the screen.
4 Shearing

A transformation that slants the shape of an object is called the Shear Transformation.

多重转换

您还可以在JavaFX中的节点上应用多个转换。下面的程序是一个示例，它同时对矩形执行“旋转”，“缩放”和“平移”转换。

将此代码保存在名称为-的文件中-

MultipleTransformationsExample.java 。

import javafx.application.Application; 
import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.scene.paint.Color; 
import javafx.scene.shape.Rectangle; 
import javafx.scene.transform.Rotate; 
import javafx.scene.transform.Scale; 
import javafx.scene.transform.Translate; 
import javafx.stage.Stage; 
         
public class MultipleTransformationsExample extends Application { 
   @Override 
   public void start(Stage stage) { 
      //Drawing a Rectangle
      Rectangle rectangle = new Rectangle(50, 50, 100, 75); 
      
      //Setting the color of the rectangle 
      rectangle.setFill(Color.BURLYWOOD); 
      
      //Setting the stroke color of the rectangle 
      rectangle.setStroke(Color.BLACK); 
       
      //creating the rotation transformation 
      Rotate rotate = new Rotate(); 
      
      //Setting the angle for the rotation 
      rotate.setAngle(20); 
      
      //Setting pivot points for the rotation 
      rotate.setPivotX(150); 
      rotate.setPivotY(225); 
       
      //Creating the scale transformation 
      Scale scale = new Scale(); 
      
      //Setting the dimensions for the transformation 
      scale.setX(1.5); 
      scale.setY(1.5); 
      
      //Setting the pivot point for the transformation 
      scale.setPivotX(300); 
      scale.setPivotY(135); 
       
      //Creating the translation transformation 
      Translate translate = new Translate();       
      
      //Setting the X,Y,Z coordinates to apply the translation 
      translate.setX(250); 
      translate.setY(0); 
      translate.setZ(0); 
       
      //Adding all the transformations to the rectangle 
      rectangle.getTransforms().addAll(rotate, scale, translate); 
        
      //Creating a Group object  
      Group root = new Group(rectangle); 
      
      //Creating a scene object 
      Scene scene = new Scene(root, 600, 300);  
      
      //Setting title to the Stage 
      stage.setTitle("Multiple transformations"); 
         
      //Adding scene to the stage 
      stage.setScene(scene); 
         
      //Displaying the contents of the stage 
      stage.show(); 
   }      
   public static void main(String args[]){ 
      launch(args); 
   } 
}

使用以下命令从命令提示符处编译并执行保存的Java文件。

javac MultipleTransformationsExample.java 
java MultipleTransformationsExample

在执行时，上面的程序将生成一个JavaFX窗口，如下所示。

多重转换

3D对象的变换

您还可以在3D对象上应用变换。以下是旋转和平移3维框的示例。

将此代码保存在名为RotationExample3D.java的文件中。

import javafx.application.Application; 
import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.scene.shape.Box; 
import javafx.scene.transform.Rotate; 
import javafx.scene.transform.Translate; 
import javafx.stage.Stage; 
         
public class RotationExample3D extends Application { 
   @Override 
   public void start(Stage stage) { 
      //Drawing a Box 
      Box box = new Box();  
      
      //Setting the properties of the Box 
      box.setWidth(150.0); 
      box.setHeight(150.0);   
      box.setDepth(150.0);       
       
      //Creating the translation transformation 
      Translate translate = new Translate();       
      translate.setX(400); 
      translate.setY(150); 
      translate.setZ(25);  
       
      Rotate rxBox = new Rotate(0, 0, 0, 0, Rotate.X_AXIS); 
      Rotate ryBox = new Rotate(0, 0, 0, 0, Rotate.Y_AXIS); 
      Rotate rzBox = new Rotate(0, 0, 0, 0, Rotate.Z_AXIS); 
      rxBox.setAngle(30); 
      ryBox.setAngle(50); 
      rzBox.setAngle(30); 
      box.getTransforms().addAll(translate,rxBox, ryBox, rzBox); 
        
      //Creating a Group object  
      Group root = new Group(box); 
         
      //Creating a scene object 
      Scene scene = new Scene(root, 600, 300);  
      
      //Setting title to the Stage 
      stage.setTitle("Drawing a cylinder"); 
         
      //Adding scene to the stage 
      stage.setScene(scene); 
         
      //Displaying the contents of the stage 
      stage.show(); 
   }      
   public static void main(String args[]){ 
      launch(args); 
   } 
}

使用以下命令从命令提示符处编译并执行保存的Java文件。

javac RotationExample3D.java 
java RotationExample3D

在执行时，上面的程序将生成一个JavaFX窗口，如下所示。

3D旋转