我编写了这个程序,它使用户能够在矩形中添加和删除圆圈,当用户左键单击时添加,当用户右键单击时删除,虽然它的添加工作正常,但删除效果不佳,例如:当我添加四个圆圈并尝试删除所有圆圈时,其中一些圆圈没有删除,我不知道为什么,我很困惑。请帮忙。
public class BoundingRectangle extends Application {
@Override
public void start(Stage primaryStage) {
Pane pane = new Pane();
ArrayList<Circle> list = new ArrayList<>();
Rectangle rectangle1 = new Rectangle(10, 10, 175, 80);
rectangle1.setStroke(Color.BLACK);
rectangle1.setFill(Color.WHITE);
Rectangle rectangle2 = new Rectangle(250, 75, 300, 200);
rectangle2.setStroke(Color.BLACK);
rectangle2.setFill(Color.WHITE);
Text text = new Text(20, 33, "INSTRUCTION\n" +
"Add: Left Click\nRemove: Right Click");
pane.setOnMouseClicked(e -> {
if (e.getButton() == MouseButton.PRIMARY) {
Circle circle = new Circle(e.getX(), e.getY(), 10);
list.add(circle);
circle.setStroke(Color.BLACK);
circle.setFill(Color.WHITE);
if (circle.getCenterX() - rectangle2.getX() < 10) {
circle.setCenterX(rectangle2.getX() + 10);
}
else if (circle.getCenterY() - rectangle2.getY() < 10) {
circle.setCenterY(rectangle2.getY() + 10);
}
else if (rectangle2.getX() + rectangle2.getWidth() -
circle.getCenterX() < 10) {
circle.setCenterX(rectangle2.getX() + rectangle2.getWidth() - 10);
}
else if (rectangle2.getY() + rectangle2.getHeight() -
circle.getCenterY() < 10) {
circle.setCenterY(rectangle2.getY() + rectangle2.getHeight() - 10);
}
pane.getChildren().add(circle);
}
else if (e.getButton() == MouseButton.SECONDARY) {
for (int i = 0; i < list.size(); i++) {
if (list.get(i).contains(e.getX(), e.getY())) {
pane.getChildren().remove(list.get(i));
list.remove(i);
break;
}
}
}
});
pane.getChildren().addAll(rectangle1, rectangle2, text);
Scene scene = new Scene(pane, 600, 300);
primaryStage.setScene(scene);
primaryStage.setTitle("BoundingRectangle");
primaryStage.show();
}
}
最佳答案
我认为这看起来像一个错误:如果在右键单击失败后调整窗口大小,则调整大小强制的重新绘制会删除圆圈。一些简单的调试表明,圆圈在应该的时候从 Pane 的子列表中删除了(因此这是一个重画问题)。
作为解决方法,请将第二个矩形替换为 Pane 。这是直接替换的代码,没有其他更改:您实际上可以对其进行大量重构以简化它(在第二个 Pane 而不是第一个 Pane 中注册鼠标监听器以进行添加,并向每个圆圈注册鼠标监听器以进行删除) ,例如):
import java.util.ArrayList;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.input.MouseButton;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.scene.text.Text;
import javafx.stage.Stage;
public class BoundingRectangle extends Application {
@Override
public void start(Stage primaryStage) {
Pane pane = new Pane();
ArrayList<Circle> list = new ArrayList<>();
Rectangle rectangle1 = new Rectangle(10, 10, 175, 80);
rectangle1.setStroke(Color.BLACK);
rectangle1.setFill(Color.WHITE);
Pane rectangle2 = new Pane();
rectangle2.relocate(250, 75);
rectangle2.setPrefSize(300, 200);
rectangle2.setStyle("-fx-border-color: black;");
Text text = new Text(20, 33, "INSTRUCTION\n"
+ "Add: Left Click\nRemove: Right Click");
pane.setOnMouseClicked(e -> {
if (e.getButton() == MouseButton.PRIMARY) {
Circle circle = new Circle(e.getX(), e.getY(), 10);
list.add(circle);
circle.setStroke(Color.BLACK);
circle.setFill(Color.WHITE);
if (circle.getCenterX() - rectangle2.getBoundsInParent().getMinX() < 10) {
circle.setCenterX(rectangle2.getBoundsInParent().getMinX() + 10);
} else if (circle.getCenterY() - rectangle2.getBoundsInParent().getMinY() < 10) {
circle.setCenterY(rectangle2.getBoundsInParent().getMinY() + 10);
} else if (rectangle2.getBoundsInParent().getMaxX()
- circle.getCenterX() < 10) {
circle.setCenterX(rectangle2.getBoundsInParent().getMaxX() - 10);
} else if (rectangle2.getBoundsInParent().getMaxY()
- circle.getCenterY() < 10) {
circle.setCenterY(rectangle2.getBoundsInParent().getMaxY() - 10);
}
pane.getChildren().add(circle);
}
else if (e.getButton() == MouseButton.SECONDARY) {
for (int i = 0; i < list.size(); i++) {
if (list.get(i).contains(e.getX(), e.getY())) {
pane.getChildren().remove(list.get(i));
list.remove(i);
break;
}
}
}
});
pane.getChildren().addAll(rectangle1, rectangle2, text);
Scene scene = new Scene(pane, 600, 300);
primaryStage.setScene(scene);
primaryStage.setTitle("BoundingRectangle");
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
这是重构版本。由于 rectangle2
现在是一个 Pane
,因此您可以直接将圆圈添加到其中,而不必担心调整其位置。右键单击是在圆圈本身上处理的,因此不需要代码来检查单击是否在圆圈上,因此,不需要单独的圆圈列表(尽管您的实际应用程序可能需要该列表)其他原因)。
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.input.MouseButton;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.scene.text.Text;
import javafx.stage.Stage;
public class BoundingRectangle extends Application {
@Override
public void start(Stage primaryStage) {
Pane pane = new Pane();
Rectangle rectangle1 = new Rectangle(10, 10, 175, 80);
rectangle1.setStroke(Color.BLACK);
rectangle1.setFill(Color.WHITE);
Pane rectangle2 = new Pane();
rectangle2.relocate(250, 75);
rectangle2.setPrefSize(300, 200);
rectangle2.setStyle("-fx-border-color: black;");
Text text = new Text(20, 33, "INSTRUCTION\n"
+ "Add: Left Click\nRemove: Right Click");
rectangle2.setOnMouseClicked(e -> {
if (e.getButton() == MouseButton.PRIMARY) {
Circle circle = new Circle(e.getX(), e.getY(), 10);
circle.setOnMouseClicked(evt -> {
if (evt.getButton() == MouseButton.SECONDARY) {
rectangle2.getChildren().remove(circle);
}
});
circle.setStroke(Color.BLACK);
circle.setFill(Color.WHITE);
rectangle2.getChildren().add(circle);
}
});
pane.getChildren().addAll(rectangle1, rectangle2, text);
Scene scene = new Scene(pane, 600, 300);
primaryStage.setScene(scene);
primaryStage.setTitle("BoundingRectangle");
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
关于java - 通过鼠标单击添加/删除,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31430767/