JavaFX 中文字原點的含義是什麼？

除了用於定位其節點的區域性座標系外，JavaFX 還為文字節點提供了額外的座標系。

textOrigin 屬性指定父座標系中文字節點座標的原點。你可以使用 setTextOrigin() 方法為該屬性設定值。此方法接受列舉值 VPos 中的一個常量。此列舉包含 4 個常量，即：BASELINE、BOTTOM、CENTER 和 TOP。

示例

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.Scanner;
import javafx.application.Application;
import javafx.geometry.VPos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.scene.text.Text;
public class TextOriginExample extends Application {
   public void start(Stage stage) throws FileNotFoundException {
      //Reading the contents of a text file.
      InputStream inputStream = new FileInputStream("D:\sample_text.txt");
      Scanner sc = new Scanner(inputStream);
      StringBuffer sb = new StringBuffer();
      while(sc.hasNext()) {
         sb.append(" "+sc.nextLine()+"\n");
      }
      //Creating a text object
      Text text = new Text(10.0, 25.0, sb.toString());
      //Wrapping the text
      text.setWrappingWidth(565);
      //Setting the vertical positioning
      text.setTextOrigin(VPos.TOP);
      //Setting the stage
      Group root = new Group(text);
      Scene scene = new Scene(root, 595, 150, Color.BEIGE);
      stage.setTitle("Text Origin (TOP)");
      stage.setScene(scene);
      stage.show();
   }
   public static void main(String args[]){
      launch(args);
   }
}

sample.txt

假設以下內容為 sample.txt 檔案的內容 −

Tutorials Point originated from the idea that there exists a class of readers who respond better 
to online content and prefer to learn new skills at their own pace from the comforts of their drawing rooms.
The journey commenced with a single tutorial on HTML in 2006 and elated by the response it generated, 
we worked our way to adding fresh tutorials to our repository which now proudly flaunts a wealth of 
tutorials and allied articles on topics ranging from programming languages to web designing to academics 
and much more.