为什么这些陈述不起作用？
if (iv_ship.intersects(iv_plane.getBoundsInLocal())) System.out.println("xxxxxxxxx");
if (iv_plane.intersects(iv_ship.getBoundsInLocal())) System.out.println("zzzz");
if (iv_plane.getBoundsInLocal().intersects(iv_ship.getBoundsInLocal())) System.out.println("dupa");
我很确定这两个物体相交。也许这是TranslateTransition的错误？ 但我也试图在海岸交叉矩形，而不是TT。 最好的问候。
以下是所有代码：
package riverpuff.v3;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import javafx.animation.AnimationTimer;
import javafx.animation.Timeline;
import javafx.animation.TranslateTransition;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.util.Duration;
/**
*
* @author Marek
*/
public class RiverPuffV3 extends Application {
public String name = "";
public Rectangle shot = new Rectangle();
@Override
public void start(Stage primaryStage) {
createMenu(primaryStage);
primaryStage.show();
primaryStage.setResizable(false);
primaryStage.getIcons().
add(new Image(getClass().getResourceAsStream("Icon.png")));
}
private void createMenu(Stage primaryStage) {
primaryStage.setScene(null);
GridPane pane_menu = new GridPane();
Button button_name = new Button("Name");
button_name.setMaxHeight(Double.MAX_VALUE);
button_name.setMaxWidth(Double.MAX_VALUE);
button_name.setOnAction(e -> {
createName(primaryStage);
/*try{
OutputStreamWriter writer = new OutputStreamWriter( new FileOutputStream("log.txt", true), "UTF-8");
BufferedWriter fbw = new BufferedWriter(writer);
fbw.newLine();
fbw.write("append txt...");
fbw.newLine();
fbw.close();
}
catch (Exception v) {
System.out.println("Error: " + v.getMessage());
}*/
});
Button button_start = new Button("Start");
button_start.setMaxHeight(Double.MAX_VALUE);
button_start.setMaxWidth(Double.MAX_VALUE);
button_start.setOnAction(e -> {
drawGame(primaryStage);
});
pane_menu.setHgap(10);
pane_menu.setVgap(10);
pane_menu.add(button_name,0,10,10,10);
pane_menu.add(button_start,15,10,10,10);
//reading name from a file
try {
String read_file = null;
BufferedReader in = new BufferedReader(new FileReader("log.txt"));
read_file = in.readLine();
Text text_name = new Text("Hello " + read_file);
pane_menu.add(text_name,5,5,10,5);
} catch (FileNotFoundException e) {
System.out.println("File not found!");
//throw new RuntimeException("File not found");
} catch (IOException e) {
System.out.println("IO Error occured");
//throw new RuntimeException("IO Error occured");
}
Scene scene_menu = new Scene(pane_menu, 300, 500);
primaryStage.setTitle("River Puff");
primaryStage.setScene(scene_menu);
}
//save name to a file
private void createName (Stage primaryStage) {
primaryStage.setScene(null);
GridPane pane_name = new GridPane();
TextField tf_name = new TextField();
tf_name.setMaxHeight(50);
tf_name.setMaxWidth(240);
tf_name.setAlignment(Pos.CENTER);
tf_name.setFont(Font.font("Verdana",25));
tf_name.setOnKeyPressed(ke -> {
if (ke.getCode() == KeyCode.ENTER) {
name = tf_name.getText();
if (!name.isEmpty()){
MyFile myFile = new MyFile();
myFile.writeTextFile("log.txt", name);
}
createMenu(primaryStage);
}
});
Button button_ok = new Button("OK");
button_ok.setMaxHeight(30);
button_ok.setMaxWidth(80);
button_ok.setOnAction(e -> {
name = tf_name.getText();
if (!name.isEmpty()){
MyFile myFile = new MyFile();
myFile.writeTextFile("log.txt", name);
}
createMenu(primaryStage);
});
Text text_name = new Text("What is your name?");
text_name.setFont(Font.font("Verdana",15));
pane_name.setHgap(10);
pane_name.setVgap(10);
pane_name.add(text_name,8,9,5,5);
pane_name.add(button_ok,11,22,8,3);
pane_name.add(tf_name,3,15,24,5);
Scene scene_name = new Scene(pane_name, 300, 500);
primaryStage.setTitle("River Puff - Name");
primaryStage.setScene(scene_name);
}
private void drawGame (Stage primaryStage) {
primaryStage.setScene(null);
final int H = 700;
final int W = 1000;
Group root = new Group();
Scene scene_game = new Scene(root, W, H, Color.LIGHTBLUE);
Button button_menu = new Button("Menu");
button_menu.setOnAction(e ->{
createMenu(primaryStage);
});
Image ship = new Image((getClass().getResourceAsStream("ship.png"))); //loading images
Image plane = new Image((getClass().getResourceAsStream("Icon.png")));
/**********************************************************************/
Rectangle[] coastL = {
new Rectangle(), new Rectangle(),
new Rectangle(), new Rectangle(),
new Rectangle(), new Rectangle(),
new Rectangle(), new Rectangle()
};
Rectangle[] coastR = {
new Rectangle(), new Rectangle(),
new Rectangle(), new Rectangle(),
new Rectangle(), new Rectangle(),
new Rectangle(), new Rectangle()
};
for (int i=0; i<8; i++) {
coastL[i].setFill(Color.FORESTGREEN);
coastL[i].setHeight(100);
coastR[i].setFill(Color.FORESTGREEN);
coastR[i].setHeight(100);
}
AnimationTimer timer = new AnimationTimer() {
int[] j = {0,0,0,0,0,0,0,0};
@Override
public void handle(long now) {
for (int i=0; i<8; i++) if (j[i]==(i*100+800)) j[i]=i*100;
for (int i=1;i<9;i++) { //creating coast
coastL[i-1].setX(0);
coastL[i-1].setY(j[i-1]-(i*100));
coastL[i-1].setWidth(250+i*(i%3));
coastR[i-1].setX(W-(250+i*(i%4)));
coastR[i-1].setY(j[i-1]-(i*100));
coastR[i-1].setWidth(250+i*(i%4));
}
for (int i=0;i<8;i++) j[i]++;
}
};
timer.start();
ImageView iv_ship = new ImageView();
iv_ship.setImage(ship);
iv_ship.setFitWidth(150);
iv_ship.setFitHeight(45);
iv_ship.setX(300);
iv_ship.setY(0);
TranslateTransition tt_shipX =
new TranslateTransition(Duration.millis(2000), iv_ship); //moving enemies
tt_shipX.setAutoReverse(true);
tt_shipX.setCycleCount(Timeline.INDEFINITE);
tt_shipX.setByX(200f);
tt_shipX.play();
TranslateTransition tt_shipY =
new TranslateTransition(Duration.millis(13000), iv_ship);
tt_shipY.setAutoReverse(false);
tt_shipY.setCycleCount(Timeline.INDEFINITE);
tt_shipY.setByY(800);
tt_shipY.play();
ImageView iv_plane = new ImageView();
iv_plane.setImage(plane);
iv_plane.setFitWidth(50);
iv_plane.setFitHeight(50);
iv_plane.setX(475);
iv_plane.setY(600);
TranslateTransition tt_plane =
new TranslateTransition(Duration.millis(1), iv_plane);
TranslateTransition tt_shot =
new TranslateTransition(Duration.millis(4000), shot);
tt_shot.setAutoReverse(false);
tt_shot.setCycleCount(1);
TranslateTransition tt_shotB =
new TranslateTransition(Duration.millis(0.5f), shot);
tt_shotB.setAutoReverse(false);
tt_shotB.setCycleCount(1);
root.setOnKeyPressed((KeyEvent ke) -> { //steering a plane }
if (ke.getCode() == KeyCode.LEFT &&
tt_plane.getNode().getTranslateX() > -475) {
tt_plane.setByX(-5f);
tt_plane.play();
System.out.println(tt_plane.getNode().getTranslateX());
}
else if (ke.getCode() == KeyCode.RIGHT &&
tt_plane.getNode().getTranslateX() < 475) {
tt_plane.setByX(5f);
tt_plane.play();
System.out.println(tt_plane.getNode().getTranslateX());
}
else if (ke.getCode() == KeyCode.A) {
shot.setFill(Color.BLACK);
shot.setX(tt_plane.getNode().getTranslateX()+495);
shot.setY(580);
shot.setWidth(10);
shot.setHeight(20);
tt_shot.setByY(-600);
tt_shot.play();
tt_shot.setOnFinished((ActionEvent arg0) -> {
shot.setDisable(true);
tt_shotB.setByY(600);
tt_shotB.play();
});
}
});
if (iv_ship.intersects(iv_plane.getBoundsInLocal())) System.out.println("xxxxxxxxx");
if (iv_plane.intersects(iv_ship.getBoundsInLocal())) System.out.println("zzzz");
if (iv_plane.getBoundsInLocal().intersects(iv_ship.getBoundsInLocal())) System.out.println("dupa");
root.getChildren().add(button_menu);
for (int i=0; i<8; i++) {
root.getChildren().add(coastL[i]);
root.getChildren().add(coastR[i]);
}
root.getChildren().add(iv_plane);
root.getChildren().add(iv_ship);
root.getChildren().add(shot);
primaryStage.setScene(scene_game);
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
答案 0 :(得分：1)
首先，您需要考虑可以转换节点（使用翻译），因此您需要getBoundsInLocal()代替getBoundsInParent()。
根据javadocs：
getBoundsInParent（）获取属性boundsInParent的值。此Node的矩形边界，包括其变换。 boundsInParent通过获取局部边界（由boundsInLocal定义）并应用创建的变换来计算。
这将在两个节点的任何给定位置都有效：
if(iv_plane.getBoundsInParent().intersects(iv_ship.getBoundsInParent())){
System.out.println("Intersection detected");
}
您必须解决的下一个问题是何时检查可能的交叉路口。根据您的代码，您只检查过一次，甚至没有添加到根/场景/阶段的节点。那不行。
为了实现这一目标，您必须在每次移动其中一个时进行检查，使用一些监听器来更改translateXProperty()和translateYProperty()中的更改，如下所示：
private final ChangeListener<Number> checkIntersection = (ob,n,n1)->{
if (iv_plane.getBoundsInParent().intersects(iv_ship.getBoundsInParent())){
System.out.println("Intersection detected");
}
};
private ImageView iv_ship, iv_plane;
private void drawGame (Stage primaryStage) {
iv_ship = new ImageView();
iv_plane = new ImageView();
...
iv_ship.translateXProperty().addListener(checkIntersection);
iv_ship.translateYProperty().addListener(checkIntersection);
...
root.getChildren().addAll(iv_plane,iv_ship);
primaryStage.setScene(scene_game);
}