Greetings SOCommunity，
现在我正在尝试学习形状之间的碰撞检测。检测本身工作正常。但是对象的重新定位并不完整。
因此，只要我的圆圈触及矩形的角落，重新定位就无法工作。
这是我的代码：
public class Collision extends Application {
@Override
public void start(Stage stage) {
Group root = new Group();
Scene scene = new Scene(root, 600, 600, Color.CADETBLUE);
// Nodes
Rectangle bounds = new Rectangle(500,500, Color.TRANSPARENT);
bounds.setStroke(Color.WHITE);
bounds.setStrokeWidth(5);
bounds.setTranslateX(50);
bounds.setTranslateY(50);
Circle c1 = new Circle(30, Color.WHITE);
c1.setTranslateX(300);
c1.setTranslateY(300);
// Events
// Collision Detection and c1 movement
EventHandler<MouseEvent> handle = new EventHandler<MouseEvent>() {
double difX; // Circle to mouse difference
double difY;
double reloX; // Circle touches bounds
double reloY;
Bounds nodeBounds = c1.getBoundsInLocal(); // Bound Objects for Node and Rect
Bounds bound = bounds.getBoundsInLocal();
public void handle(MouseEvent event) {
// If Pressed save Coordinates
if(event.getEventType() == MouseEvent.MOUSE_PRESSED) {
difX = event.getX();
difY = event.getY();
}
// If Dragged check Collision and relocate
else if(event.getEventType() == MouseEvent.MOUSE_DRAGGED) {
c1.setTranslateX( event.getSceneX() - difX );
c1.setTranslateY( event.getSceneY() - difY );
if( c1.localToScene(nodeBounds).getMinX() < bounds.localToScene(bound).getMinX() ) {
bounds.setStroke(Color.RED);
c1.setTranslateX( bound.getMinX() - nodeBounds.getMinX() + 50 );
}
else if( c1.localToScene(nodeBounds).getMinY() < bounds.localToScene(bound).getMinY() ) {
bounds.setStroke(Color.RED);
c1.setTranslateY( bound.getMinY() - nodeBounds.getMinY() + 50 );
}
else if( c1.localToScene(nodeBounds).getMaxX() > bounds.localToScene(bound).getMaxX() ) {
bounds.setStroke(Color.RED);
c1.setTranslateX( bound.getMaxX() - nodeBounds.getMaxX() + 50 );
}
else if( c1.localToScene(nodeBounds).getMaxY() > bounds.localToScene(bound).getMaxY() ) {
bounds.setStroke(Color.RED);
c1.setTranslateY( bound.getMaxY() - nodeBounds.getMaxY() + 50 );
}
else {
bounds.setStroke(Color.WHITE);
}
}
}
};
c1.addEventHandler(MouseEvent.ANY, handle);
//Stage is setUp
root.getChildren().addAll(bounds, c1);
stage.setTitle("omfg, srsly !?");
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);}}
请帮助我找出为什么这不起作用以及如何让它工作。
提前Thx：）
答案 0 :(得分：1)
这是一个你可以玩的应用程序来弄清楚你做错了什么。
主：
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
/**
*
* @author blj0011
*/
public class CollisionDection extends Application {
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
控制器：
import java.net.URL;
import java.util.ResourceBundle;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.geometry.Point2D;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Polygon;
import javafx.scene.shape.Rectangle;
import javafx.scene.shape.Shape;
/**
*
* @author sedj601
*/
public class FXMLDocumentController implements Initializable {
@FXML private Label lblMain;
@FXML private Polygon polyOne, polyTwo;
@FXML private Circle circle1;
@FXML private Rectangle rectangle1;
final ObjectProperty<Point2D> mousePosition = new SimpleObjectProperty<>();
@Override
public void initialize(URL url, ResourceBundle rb) {
// TODO
polyOne.setOnMousePressed((MouseEvent event) -> {
mousePosition.set(new Point2D(event.getSceneX(), event.getSceneY()));
});
polyOne.setOnMouseDragged((MouseEvent event) -> {
double deltaX = event.getSceneX() - mousePosition.get().getX();
double deltaY = event.getSceneY() - mousePosition.get().getY();
polyOne.setLayoutX(polyOne.getLayoutX()+deltaX);
polyOne.setLayoutY(polyOne.getLayoutY()+deltaY);
mousePosition.set(new Point2D(event.getSceneX(), event.getSceneY()));
Shape intersect = Shape.intersect(polyOne, polyTwo);
if(intersect.getBoundsInLocal().getWidth() != -1)
{
System.out.println("This object can overlap other the other object!");
lblMain.setText("Collision detected!");
}
else
{
intersect.getBoundsInLocal().getWidth();
lblMain.setText("Collision not detected!");
}
});
polyTwo.setOnMousePressed((MouseEvent event) -> {
mousePosition.set(new Point2D(event.getSceneX(), event.getSceneY()));
});
polyTwo.setOnMouseDragged((MouseEvent event) -> {
double deltaX = event.getSceneX() - mousePosition.get().getX();
double deltaY = event.getSceneY() - mousePosition.get().getY();
polyTwo.setLayoutX(polyTwo.getLayoutX() + deltaX);
polyTwo.setLayoutY(polyTwo.getLayoutY() + deltaY);
mousePosition.set(new Point2D(event.getSceneX(), event.getSceneY()));
Shape intersect = Shape.intersect(polyOne, polyTwo);
{
if(intersect.getBoundsInLocal().getWidth() != -1)
{
System.out.println("This object can not overlap other the other object!");
polyTwo.setLayoutX(polyTwo.getLayoutX() - deltaX);
polyTwo.setLayoutY(polyTwo.getLayoutY() - deltaY);
lblMain.setText("Collision detected!");
}
else
{
lblMain.setText("Collision not detected!");
}
}
});
circle1.setOnMousePressed((MouseEvent event) -> {
mousePosition.set(new Point2D(event.getSceneX(), event.getSceneY()));
});
circle1.setOnMouseDragged((MouseEvent event) -> {
double deltaX = event.getSceneX() - mousePosition.get().getX();
double deltaY = event.getSceneY() - mousePosition.get().getY();
circle1.setLayoutX(circle1.getLayoutX() + deltaX);
circle1.setLayoutY(circle1.getLayoutY() + deltaY);
mousePosition.set(new Point2D(event.getSceneX(), event.getSceneY()));
Shape intersect = Shape.intersect(rectangle1, circle1);
{
if(intersect.getBoundsInLocal().getWidth() != -1)
{
System.out.println("This object can not overlap other the other object!");
circle1.setLayoutX(circle1.getLayoutX() - deltaX);
circle1.setLayoutY(circle1.getLayoutY() - deltaY);
lblMain.setText("Collision detected!");
}
else
{
lblMain.setText("Collision not detected!");
}
}
});
rectangle1.setOnMousePressed((MouseEvent event) -> {
mousePosition.set(new Point2D(event.getSceneX(), event.getSceneY()));
});
rectangle1.setOnMouseDragged((MouseEvent event) -> {
double deltaX = event.getSceneX() - mousePosition.get().getX();
double deltaY = event.getSceneY() - mousePosition.get().getY();
rectangle1.setLayoutX(rectangle1.getLayoutX() + deltaX);
rectangle1.setLayoutY(rectangle1.getLayoutY() + deltaY);
mousePosition.set(new Point2D(event.getSceneX(), event.getSceneY()));
Shape intersect = Shape.intersect(circle1, rectangle1);
{
if(intersect.getBoundsInLocal().getWidth() != -1)
{
System.out.println("This object can not overlap other the other object!");
rectangle1.setLayoutX(rectangle1.getLayoutX() - deltaX);
rectangle1.setLayoutY(rectangle1.getLayoutY() - deltaY);
lblMain.setText("Collision detected!");
}
else
{
lblMain.setText("Collision not detected!");
}
}
});
}
}
FXML：
<AnchorPane id="AnchorPane" fx:id="apMain" prefHeight="446.0" prefWidth="577.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="collisiondection.FXMLDocumentController">
<children>
<Label fx:id="lblMain" layoutX="254.0" layoutY="408.0" minHeight="16" minWidth="69" />
<Polygon fx:id="polyOne" fill="DODGERBLUE" layoutX="122.0" layoutY="166.0" stroke="BLACK" strokeType="INSIDE">
<points>
<Double fx:value="-50.0" />
<Double fx:value="40.0" />
<Double fx:value="50.0" />
<Double fx:value="40.0" />
<Double fx:value="0.0" />
<Double fx:value="-60.0" />
</points>
</Polygon>
<Polygon fx:id="polyTwo" fill="DODGERBLUE" layoutX="419.0" layoutY="166.0" stroke="BLACK" strokeType="INSIDE">
<points>
<Double fx:value="-50.0" />
<Double fx:value="40.0" />
<Double fx:value="50.0" />
<Double fx:value="40.0" />
<Double fx:value="0.0" />
<Double fx:value="-60.0" />
</points>
</Polygon>
<Circle fx:id="circle1" fill="DODGERBLUE" layoutX="113.0" layoutY="372.0" radius="42.0" stroke="BLACK" strokeType="INSIDE" />
<Rectangle fx:id="rectangle1" arcHeight="5.0" arcWidth="5.0" fill="DODGERBLUE" height="100.0" layoutX="379.0" layoutY="314.0" stroke="BLACK" strokeType="INSIDE" width="113.0" />
</children>
</AnchorPane>