java Javafx鼠标事件y坐标偏移在子场景中不正确
我创建了一个星形打印应用程序来打印三维星形绘图仪的标签，以便将标签映射到场景的局部。我想这样做，这样每当我旋转星场时，标签总是朝前，不会随着单个恒星旋转（因为它们无法读取，所以很烦人）
在我在上面添加了一个控制面板之前，它工作得非常好。在下面的应用程序中，如果控制面板不存在，则使用星号位置标记轨迹。但对于控制面板，标签的y偏移量与控制面板高度的大小成正比
问题是“mousePosY=me.getSceneY（）；”返回场景本身的鼠标位置，而不是定义的子场景。我原以为“subScene.setonmousedrable（（MouseEvent me）-{”会给我鼠标相对于subScene而不是场景的位置
有没有办法解决这个问题，使返回的X，Y位置仅用于次场景
下面的代码是我的应用程序的一个非常精简的版本，它显示了实际问题本身
import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Insets;
import javafx.geometry.Point3D;
import javafx.scene.*;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Background;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.shape.Sphere;
import javafx.scene.text.Font;
import javafx.scene.transform.Rotate;
import javafx.scene.transform.Translate;
import javafx.stage.Stage;
import lombok.extern.slf4j.Slf4j;
import java.util.HashMap;
import java.util.Random;
import static org.fxyz3d.geometry.MathUtils.clamp;
/**
* example for flat labels
*/
@Slf4j
public class StarFieldExample extends Application {
public static final int SCALE_X = 510;
public static final int SCALE_Y = 540;
public static final int SCALE_Z = 0;
final double sceneWidth = 600;
final double sceneHeight = 600;
private double mousePosX;
private double mousePosY;
private double mouseOldX;
private double mouseOldY;
private double mouseDeltaX;
private double mouseDeltaY;
private final Font font = new Font("arial", 10);
// We'll use custom Rotate transforms to manage the coordinate conversions
private final Rotate rotateX = new Rotate(0, Rotate.X_AXIS);
private final Rotate rotateY = new Rotate(0, Rotate.Y_AXIS);
private final Rotate rotateZ = new Rotate(0, Rotate.Z_AXIS);
private final Group root = new Group();
private final Group world = new Group(); //all 3D nodes in scene
private final Group labelGroup = new Group(); //all generic 3D labels
//All shapes and labels linked via hash for easy update during camera movement
private final HashMap<Node, Label> shape3DToLabel = new HashMap<>();
private SubScene subScene;
////// support
private final Random random = new Random();
private final static double RADIUS_MAX = 7;
private final static double X_MAX = 300;
private final static double Y_MAX = 300;
private final static double Z_MAX = 300;
private final Label scaleLabel = new Label("Scale: 5 ly");
public Pane createStarField() {
// attach our custom rotation transforms so we can update the labels dynamically
world.getTransforms().addAll(rotateX, rotateY, rotateZ);
subScene = new SubScene(world, sceneWidth, sceneHeight, true, SceneAntialiasing.BALANCED);
subScene.setFill(Color.BLACK);
PerspectiveCamera camera = new PerspectiveCamera(true);
camera.setNearClip(0.1);
camera.setFarClip(10000.0);
camera.setTranslateZ(-1000);
subScene.setCamera(camera);
Group sceneRoot = new Group(subScene);
sceneRoot.getChildren().add(labelGroup);
generateRandomStars(5);
handleMouseEvents();
// add to the 2D portion of this component
Pane pane = new Pane();
pane.setPrefSize(sceneWidth, sceneHeight);
pane.setMaxSize(Pane.USE_COMPUTED_SIZE, Pane.USE_COMPUTED_SIZE);
pane.setMinSize(Pane.USE_COMPUTED_SIZE, Pane.USE_COMPUTED_SIZE);
pane.setBackground(Background.EMPTY);
pane.getChildren().add(sceneRoot);
pane.setPickOnBounds(true);
subScene.widthProperty().bind(pane.widthProperty());
subScene.heightProperty().bind(pane.heightProperty());
Platform.runLater(this::updateLabels);
return (pane);
}
private void handleMouseEvents() {
subScene.setOnMousePressed((MouseEvent me) -> {
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
mouseOldX = me.getSceneX();
mouseOldY = me.getSceneY();
}
);
subScene.setOnMouseDragged((MouseEvent me) -> {
mouseOldX = mousePosX;
mouseOldY = mousePosY;
mousePosX = me.getSceneX();
mousePosY = me.getSceneY();
mouseDeltaX = (mousePosX - mouseOldX);
mouseDeltaY = (mousePosY - mouseOldY);
double modifier = 5.0;
double modifierFactor = 0.1;
if (me.isPrimaryButtonDown()) {
if (me.isAltDown()) { //roll
rotateZ.setAngle(((rotateZ.getAngle() + mouseDeltaX * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180); // +
} else {
rotateY.setAngle(((rotateY.getAngle() + mouseDeltaX * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180); // +
rotateX.setAngle(
clamp(
(((rotateX.getAngle() - mouseDeltaY * modifierFactor * modifier * 2.0) % 360 + 540) % 360 - 180),
-60,
60
)
); // -
}
}
updateLabels();
}
);
}
public void generateRandomStars(int numberStars) {
for (int i = 0; i < numberStars; i++) {
double radius = random.nextDouble() * RADIUS_MAX;
Color color = randomColor();
double x = random.nextDouble() * X_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
double y = random.nextDouble() * Y_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
double z = random.nextDouble() * Z_MAX * 2 / 3 * (random.nextBoolean() ? 1 : -1);
String labelText = "Star " + i;
boolean fadeFlag = random.nextBoolean();
createSphereLabel(radius, x, y, z, color, labelText, fadeFlag);
}
//Add to hashmap so updateLabels() can manage the label position
scaleLabel.setFont(new Font("Arial", 15));
scaleLabel.setTextFill(Color.WHEAT);
scaleLabel.setTranslateX(SCALE_X);
scaleLabel.setTranslateY(SCALE_Y);
scaleLabel.setTranslateZ(SCALE_Z);
labelGroup.getChildren().add(scaleLabel);
log.info("shapes:{}", shape3DToLabel.size());
}
private Color randomColor() {
int r = random.nextInt(255);
int g = random.nextInt(255);
int b = random.nextInt(255);
return Color.rgb(r, g, b);
}
private void createSphereLabel(double radius, double x, double y, double z, Color color, String labelText, boolean fadeFlag) {
Sphere sphere = new Sphere(radius);
sphere.setTranslateX(x);
sphere.setTranslateY(y);
sphere.setTranslateZ(z);
sphere.setMaterial(new PhongMaterial(color));
//add our nodes to the group that will later be added to the 3D scene
world.getChildren().add(sphere);
Label label = new Label(labelText);
label.setTextFill(color);
label.setFont(font);
labelGroup.getChildren().add(label);
//Add to hashmap so updateLabels() can manage the label position
shape3DToLabel.put(sphere, label);
}
private void updateLabels() {
shape3DToLabel.forEach((node, label) -> {
Point3D coordinates = node.localToScene(Point3D.ZERO, true);
//Clipping Logic
//if coordinates are outside of the scene it could
//stretch the screen so don't transform them
double x = coordinates.getX();
double y = coordinates.getY();
// is it left of the view?
if (x < 0) {
x = 0;
}
// is it right of the view?
if ((x + label.getWidth() + 5) > subScene.getWidth()) {
x = subScene.getWidth() - (label.getWidth() + 5);
}
// is it above the view?
if (y < 0) {
y = 0;
}
// is it below the view
if ((y + label.getHeight()) > subScene.getHeight()) {
y = subScene.getHeight() - (label.getHeight() + 5);
}
//update the local transform of the label.
label.getTransforms().setAll(new Translate(x, y));
});
scaleLabel.setTranslateX(SCALE_X);
scaleLabel.setTranslateY(SCALE_Y);
scaleLabel.setTranslateZ(SCALE_Z);
}
//////////////////////////////////
@Override
public void start(Stage primaryStage) throws Exception {
Pane controls = createControls();
Pane pane = createStarField();
VBox vBox = new VBox(
controls,
pane
);
root.getChildren().add(vBox);
Scene scene = new Scene(root, sceneWidth, sceneHeight - 40);
primaryStage.setTitle("2D Labels over 3D SubScene");
primaryStage.setScene(scene);
primaryStage.show();
}
private VBox createControls() {
VBox controls = new VBox(10, new Button("Button"));
controls.setPadding(new Insets(10));
return controls;
}
public static void main(String[] args) {
launch(args);
}
}
# 1 楼答案
我把它分解成一个更简单的关于鼠标偏移的问题，解决了这个问题，然后把这个解决方案用到这里
关键问题是，我假设鼠标事件（x，y）位置与次场景的偏移量为零，实际上，它们是相对于包含场景的。我必须计算组件相对于父组件的边界。在更大的应用程序的布局中，有了子场景的实际位置，我就可以计算校正后的（x，y）位置
答案如下：