JavaFX 3D 可視化編程二

上一篇介紹了基於JavaFX 3D的物體縮放，分別是通過鍵盤的操作事件，前後移動物體和前後移動相機。這一篇介紹物體的旋轉。

主要是在Group的基礎上新建了個SmartGroup類，給他添加了可以進行旋轉的函數。新建類代碼如下

class SmartGroup extends Group{
        Rotate r;
        Transform t = new Rotate();

        void rotateByX(int ang){
            r=new Rotate(ang, Rotate.X_AXIS);
            t = t.createConcatenation(r);
            this.getTransforms().clear();
            this.getTransforms().addAll(t);
        }
        void rotateByY(int ang){
            r=new Rotate(ang, Rotate.Y_AXIS);
            t = t.createConcatenation(r);
            this.getTransforms().clear();
            this.getTransforms().addAll(t);
        }

    }

整體代碼如下

package chapt3;

import javafx.application.Application;
import javafx.geometry.Point3D;
import javafx.scene.Camera;
import javafx.scene.Group;
import javafx.scene.PerspectiveCamera;
import javafx.scene.Scene;
import javafx.scene.input.KeyEvent;
import javafx.scene.paint.Color;
import javafx.scene.shape.Sphere;
import javafx.scene.shape.Box;
import javafx.scene.transform.Rotate;
import javafx.scene.transform.Transform;
import javafx.stage.Stage;

public class Rotation3D extends Application {

    private static final int WIDTH=1400;
    private  static  final  int HEIGHT=800;

    @Override
    public void start(Stage primaryStage) throws Exception{
        Box box = new Box( 100, 20, 50);

        SmartGroup group = new SmartGroup();
        group.getChildren().add(box);

        Camera camera = new PerspectiveCamera();
        Scene scene =new Scene(group,  WIDTH,  HEIGHT);
        scene.setFill(Color.SILVER);
        scene.setCamera(camera);

        group.translateXProperty().set(WIDTH/2);
        group.translateYProperty().set(HEIGHT/2);
        group.translateZProperty().set(-1200);

        //Transform transform = new Rotate(65, new Point3D(1,0,0));
        //box.getTransforms().add(transform);

        primaryStage.addEventHandler(KeyEvent.KEY_PRESSED, event->{
            switch (event.getCode()){
                case W:
                    group.translateZProperty().set(group.getTranslateZ()+50);
                    break;
                case S:
                    group.translateZProperty().set(group.getTranslateZ()-50);
                    break;
                case Q:
                    group.rotateByX(10);
                    break;
                case E:
                    group.rotateByX(-10);
                    break;
                case A:
                    group.rotateByY(10);
                    break;
                case D:
                    group.rotateByY(-10);
                    break;
            }
        });


        primaryStage.setTitle("Camera3D");
        primaryStage.setScene(scene);
        primaryStage.show();
    }


    public static void main(String[] args) {
        launch(args);
    }

    class SmartGroup extends Group{
        Rotate r;
        Transform t = new Rotate();

        void rotateByX(int ang){
            r=new Rotate(ang, Rotate.X_AXIS);
            t = t.createConcatenation(r);
            this.getTransforms().clear();
            this.getTransforms().addAll(t);
        }
        void rotateByY(int ang){
            r=new Rotate(ang, Rotate.Y_AXIS);
            t = t.createConcatenation(r);
            this.getTransforms().clear();
            this.getTransforms().addAll(t);
        }

    }
}

效果如下