Javafx 简明教程

JavaFX - Light.Distant Effect

将远光效果应用于某个节点时,就会模拟它上面的光,就好像它是由远处光源生成的一样。

Distant Light Source − 与节点距离较远的某个光源。在此,光从光源向一个方向衰减。

distant light source

javafx.scene.effect 中名为 Light.Distant 的类表示远光源。该类包含两个属性,包括 −

  1. azimuth − 此属性是 double 类型,表示光的方位角。

  2. elevation − 此属性是 double 类型,表示光的仰角。

Example

以下程序是一个展示 JavaFX 光照效果的示例。在此示例中,光源是远光源。下面我们正在场景中绘制文本“Welcome to Tutorialspoint”和一个圆。

我们将对其应用光照效果,其中光由远光源发出。

将此代码另存为 DistantLightingExample.java

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.effect.Light;
import javafx.scene.effect.Lighting;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;

public class DistantLightingExample extends Application {
   @Override
   public void start(Stage stage) {
      //Creating a Text object
      Text text = new Text();

      //Setting font to the text
      text.setFont(Font.font(null, FontWeight.BOLD, 40));

      //setting the position of the text
      text.setX(60);
      text.setY(50);

      //Setting the text to be embedded.
      text.setText("Welcome to Tutorialspoint");

      //Setting the color of the text
      text.setFill(Color.RED);

      //Drawing a Circle
      Circle circle = new Circle();

      //Setting the center of the circle
      circle.setCenterX(300.0f);
      circle.setCenterY(160.0f);

      //Setting the radius of the circle
      circle.setRadius(100.0f);

      //setting the fill color of the circle
      circle.setFill(Color.CORNFLOWERBLUE);

      //Instantiating the Light.Distant class
      Light.Distant light = new Light.Distant();

      //Setting the properties of the light source
      light.setAzimuth(45.0);
      light.setElevation(30.0);

      //Instantiating the Lighting class
      Lighting lighting = new Lighting();

      //Setting the source of the light
      lighting.setLight(light);

      //Applying the lighting effect to the text
      text.setEffect(lighting);

      //Applying the lighting effect to the circle
      circle.setEffect(lighting);

      //Creating a Group object
      Group root = new Group(text,circle);

      //Creating a scene object
      Scene scene = new Scene(root, 600, 300);

      //Setting title to the Stage
      stage.setTitle("Distant light effect 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,从命令提示符编译并执行已保存的 java 文件。

javac --module-path %PATH_TO_FX% --add-modules javafx.controls DistantLightingExample.java
java --module-path %PATH_TO_FX% --add-modules javafx.controls DistantLightingExample

Output

执行后,上述程序会生成如下所示的 JavaFX 窗口。

distant light source example