给定2D场景,其中一个节点包含一个包含二维旋转变换的组。如何在点击时将组内的节点定位到鼠标的场景x和y坐标?
我尝试移动到click事件位置的节点是一个圆圈,它位于已旋转的组内。旋转发生在组右上角的一个枢轴上。该组还有其他节点。
我一直在努力想要实现这一点而没有运气。如果旋转节点的父节点,它就不会将节点定位在发生单击的位置。我尝试了各种技术,包括localToScene界限,没有运气。
有办法做到这一点吗?谢谢你的时间=)
以下是一些代码,显示了问题的最低可验证示例。运行它以进行演示
您可以拖动圆圈并点击鼠标选择圆圈。只要组不旋转,这样做就可以正常工作。 要旋转组,请使用键盘上的左和右方向键。旋转组后,拖动和鼠标坐标不再准确!
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javafx.animation.FadeTransition;
import javafx.animation.ParallelTransition;
import javafx.animation.ScaleTransition;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.scene.transform.Rotate;
import javafx.stage.Stage;
import javafx.util.Duration;
public class DemoBounds extends Application {
private static final int WIDTH = 600;
private static final int HEIGHT = 700;
private static final int CIRCLE_COUNT = 12;
private static final int RECTANGLE_COUNT = 3;
private static final int CIRCLE_DISTANCE = 150;
private static final int RECTANGLE_DISTANCE = 20;
private Color selectedColor = Color.RED;
private Color normalColor = Color.YELLOW;
private Rotate rotator = new Rotate();
private List<Circle> circles = new ArrayList<>();
private List<Rectangle> rectangles = new ArrayList<>();
public static void main(String[] args) {
Application.launch(args);
}
@Override
public void start(Stage stage) {
Rotate rotate = new Rotate();
Group root = new Group();
Pane pane = new Pane(root);
createRectangles();
createCircles();
root.getChildren().addAll(rectangles);
root.getChildren().addAll(circles);
root.getTransforms().add(rotate);
Scene scene = new Scene(pane, WIDTH, HEIGHT, Color.BLACK);
AddRotateControls(root);
assignActionHandling(pane);
stage.sizeToScene();
stage.setScene(scene);
stage.setTitle("Example");
stage.show();
}
private void AddRotateControls(Group root) {
root.getTransforms().add(rotator);
rotator.setPivotX(150);
rotator.setPivotY(150);
rotator.setAngle(0);
root.getScene().setOnKeyPressed(e -> {
switch(e.getCode()){
case RIGHT:
rotator.setAngle(rotator.getAngle() + 1);
break;
case LEFT:
rotator.setAngle(rotator.getAngle() - 1);
break;
default:
break;
}
});
}
private void assignActionHandling(Pane pane) {
pane.setOnMousePressed(e -> {
Circle circle = new Circle(e.getSceneX(), e.getSceneY(), 1, Color.DEEPSKYBLUE);
pane.getChildren().add(circle);
Duration duration = Duration.millis(350);
ScaleTransition scale = new ScaleTransition(duration, circle);
FadeTransition fade = new FadeTransition(duration, circle);
ParallelTransition pack = new ParallelTransition(circle, scale, fade);
scale.setFromX(1);
scale.setFromY(1);
scale.setToX(20);
scale.setToY(20);
fade.setFromValue(1);
fade.setToValue(0);
pack.setOnFinished(e2 -> {
pane.getChildren().remove(circle);
});
pack.play();
Circle selected = circles.stream().filter(c -> ((CircleData) c.getUserData()).isSelected()).findFirst().orElse(null);
if (selected != null) {
selected.setCenterX(e.getSceneX());
selected.setCenterY(e.getSceneY());
}
});
}
private void createRectangles() {
int width = 100;
int height = HEIGHT / 3;
int startX = ((WIDTH / 2) - (((width / 2) * 3) + (RECTANGLE_DISTANCE * 3))) + (RECTANGLE_DISTANCE * 2);
int startY = (HEIGHT / 2) - (height / 2);
for(int i = 0; i<RECTANGLE_COUNT; i++){
Rectangle rect = new Rectangle();
rect.setFill(Color.MEDIUMTURQUOISE);
rect.setWidth(width);
rect.setHeight(height);
rect.setX(startX);
rect.setY(startY);
rectangles.add(rect);
startX += (width + RECTANGLE_DISTANCE);
}
}
private void createCircles() {
Random randon = new Random();
int centerX = WIDTH / 2;
int centerY = HEIGHT / 2;
int minX = centerX - CIRCLE_DISTANCE;
int maxX = centerX + CIRCLE_DISTANCE;
int minY = centerY - CIRCLE_DISTANCE;
int maxY = centerY + CIRCLE_DISTANCE;
int minRadius = 10;
int maxRadius = 50;
for (int i = 0; i < CIRCLE_COUNT; i++) {
int x = minX + randon.nextInt(maxX - minX + 1);
int y = minY + randon.nextInt(maxY - minY + 1);
int radius = minRadius + randon.nextInt(maxRadius - minRadius + 1);
Circle circle = new Circle(x, y, radius, Color.ORANGE);
circle.setStroke(normalColor);
circle.setStrokeWidth(5);
circle.setUserData(new CircleData(circle, i, false));
circles.add(circle);
}
assignCircleActionHandling();
}
private double mouseX;
private double mouseY;
private void assignCircleActionHandling() {
for (Circle circle : circles) {
circle.setOnMousePressed(e -> {
mouseX = e.getSceneX() - circle.getCenterX();
mouseY = e.getSceneY() - circle.getCenterY();
((CircleData) circle.getUserData()).setSelected(true);
unselectRest(((CircleData) circle.getUserData()).getId());
});
circle.setOnMouseDragged(e -> {
double deltaX = e.getSceneX() - mouseX;
double deltaY = e.getSceneY() - mouseY;
circle.setCenterX(deltaX);
circle.setCenterY(deltaY);
});
circle.setOnMouseReleased(e -> {
e.consume();
});
}
}
private void unselectRest(int current) {
circles.stream().filter(c -> ((CircleData) c.getUserData()).getId() != current).forEach(c -> {
((CircleData) c.getUserData()).setSelected(false);
});
}
public class CircleData {
private int id;
private boolean selected;
private Circle circle;
public CircleData(Circle circle, int id, boolean selected) {
super();
this.id = id;
this.circle = circle;
this.selected = selected;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public boolean isSelected() {
return selected;
}
public void setSelected(boolean selected) {
this.selected = selected;
if (selected) {
circle.setStroke(selectedColor);
} else {
circle.setStroke(normalColor);
}
}
}
}
答案 0 :(得分:1)
您没有提供代码的详细信息,但轮换的轮次可能存在问题。如果您在某些情况下尝试了解旋转行为,如果您不了解此机制,这可能会让您感到疯狂。每次当你移动一些附加到你的组的节点时,这个旋转的枢轴会被重新计算,这会导致不必要的效果,尽管在某些情况下它只是你想要的。
如果您希望完全控制旋转,则应使用与此处所述类似的代码:http://docs.oracle.com/javafx/8/3d_graphics/overview.htm
更新
在您的方法assignActionHandling
中修改这几行。为了使这个工作,你必须在那里使root
可用。
if (selected != null) {
Point2D p = root.sceneToLocal(e.getSceneX(), e.getSceneY());
selected.setCenterX(p.getX());
selected.setCenterY(p.getY());
}
您遇到问题的原因是您正在混淆坐标系。圆的中心点相对于根坐标系定义,但相对于窗格和场景旋转。因此,在设置圆的新中心之前,必须将场景坐标转换为局部根坐标。