Javafx 简明教程

JavaFX - Point.Spot Effect

点光源是一种光源，其中光位于特定点，从该点发出的光向所有方向均匀照射。

The Point Light Source is a type of light source where the light is located at a specific point and the light emitted from it is shone equally in all directions.

对某个节点应用此效果后，就会在该节点上模拟光，就好像光是由点光源产生的。

On applying this effect to a node, a light is simulated on it, as if it is being generated by a point light source.

point light source

Point.Spot − 此光源发出的光从单点向所有方向衰减，光的强度取决于物体与光源之间的距离。

Point Light Source − The light from this source attenuates in all directions from a single point the intensity of the light depends on the distance of the object from the source.

包 javafx.scene.effect 中名为 x 的类表示点光源。此类包含四个属性，其中包括：

The class named Point.Spot of the package javafx.scene.effect represents the point light source. This class contains four properties, which include −

  1. x − This property is of the type double and it represents the x coordinate of the position of the light.

  2. y − This property is of the type double and it represents the y coordinate of the position of the light.

  3. z − This property is of the type double and it represents the z coordinate of the position of the light.

Example

以下程序是一个演示 JavaFX 照明效果的示例。在其中，我们在场景中绘制文本“欢迎来到 Tutorialspoint”和一个圆形。

The following program is an example demonstrating the lighting effect of JavaFX. In here, we are drawing a text “Welcome to Tutorialspoint” and a circle in a scene.

我们对此应用 lighting 效果，其中光由点光源发出。

To these, we are applying the lighting effect, where the light is being emitted by a Point light source.

将此代码保存在名为 ToolBar 的文件中。

Save this code in a file with the name PointLightExample.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 PointLightExample 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.Point class
      Light.Point light = new Light.Point();

      //Setting the color of the light
      light.setColor(Color.GRAY);

      //Setting the position of the light
      light.setX(70);
      light.setY(55);
      light.setZ(45);

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

      //Setting 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("Point 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。

Compile and execute the saved java file from the command prompt using the following commands.

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

Output

执行后，上述程序会生成如下所示的 JavaFX 窗口。

On executing, the above program generates a JavaFX window as shown below.

point light effect example