本文介绍了可调整大小的可移动矩形的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
使用以下代码（感谢此处的几个帖子），我画了一个矩形，我想要可调整大小和可移动。
两个锚点（左上角和右下角）做我想要的，最后一个（中下部）移动矩形，但是两个第一个锚点不跟随矩形。
With the following code (thanks to several posts here), I draw a rectangle, that I want to be resizable and movable.Two anchors (the upper left and lower right) do what I want, and the last one (lower middle) moves the rectangle, but the two first anchors do not follow the rectangle.
当我移动它们时，它们的监听器会调整矩形的大小。
When I make them move, the Listener of them, resizes the rectangle.
package application;
import javafx.application.Application;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.scene.Cursor;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.scene.shape.Shape;
import javafx.scene.shape.StrokeType;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
public class Main extends Application {
private Rectangle rectangle;
private Group group;
private Scene scene;
private Stage primaryStage;
private ObservableList<Double> Coins;
public static void main(String[] args) {
Application.launch(args);
}
@Override
public void start(Stage primaryStage) {
group = new Group();
rectangle = new Rectangle(200,200,400,300);
Coins = FXCollections.observableArrayList();
//UpperLeft
Coins.add(rectangle.getX());
Coins.add(rectangle.getY());
//LowerRight
Coins.add(rectangle.getX() + rectangle.getWidth());
Coins.add(rectangle.getY()+ rectangle.getHeight());
//Moving
Coins.add(rectangle.getX() + (rectangle.getWidth()/2));
Coins.add(rectangle.getY()+ (rectangle.getHeight()));
group.getChildren().addAll(createControlAnchorsFor(Coins));
group.getChildren().add(rectangle);
scene = new Scene(group,800,800);
primaryStage.setScene(scene);
primaryStage.show();
}
//@return a list of anchors which can be dragged around to modify points in the format [x1, y1, x2, y2...]
private ObservableList<Anchor> createControlAnchorsFor(final ObservableList<Double> points) {
ObservableList<Anchor> anchors = FXCollections.observableArrayList();
//Coin GaucheHaut
DoubleProperty xProperty = new SimpleDoubleProperty(points.get(0));
DoubleProperty yProperty = new SimpleDoubleProperty(points.get(1));
xProperty.addListener(new ChangeListener<Number>() {
@Override public void changed(ObservableValue<? extends Number> ov, Number oldX, Number x) {
System.out.println(oldX + " et " + x);
rectangle.setX((double) x);
rectangle.setWidth((double) rectangle.getWidth() -((double) x- (double) oldX));
anchors.get(2).setCenterX((double) x + rectangle.getWidth()/2 );
}
});
yProperty.addListener(new ChangeListener<Number>() {
@Override public void changed(ObservableValue<? extends Number> ov, Number oldY, Number y) {
rectangle.setY((double) y);
rectangle.setHeight((double) rectangle.getHeight() -((double) y- (double) oldY));
}
});
anchors.add(new Anchor(Color.GOLD, xProperty, yProperty));
//Coin DroiteBas
DoubleProperty xProperty2 = new SimpleDoubleProperty(points.get(2));
DoubleProperty yProperty2 = new SimpleDoubleProperty(points.get(3));
xProperty2.addListener(new ChangeListener<Number>() {
@Override public void changed(ObservableValue<? extends Number> ov, Number oldX, Number x) {
rectangle.setWidth((double) rectangle.getWidth() -((double) oldX- (double) x));
anchors.get(2).setCenterX((double) x - rectangle.getWidth()/2 );
}
});
yProperty2.addListener(new ChangeListener<Number>() {
@Override public void changed(ObservableValue<? extends Number> ov, Number oldY, Number y) {
rectangle.setHeight((double) rectangle.getHeight() -((double) oldY- (double) y));
anchors.get(2).setCenterY((double) y);
}
});
anchors.add(new Anchor(Color.GOLD, xProperty2, yProperty2));
//Moving
DoubleProperty xPropertyM = new SimpleDoubleProperty(points.get(4));
DoubleProperty yPropertyM = new SimpleDoubleProperty(points.get(5));
xPropertyM.addListener(new ChangeListener<Number>() {
@Override public void changed(ObservableValue<? extends Number> ov, Number oldX, Number x) {
rectangle.setX((double) x - rectangle.getWidth()/2 );
//anchors.get(0).setCenterX((double) x- rectangle.getWidth()/2);
//anchors.get(0).setVisible(false);
}
});
yPropertyM.addListener(new ChangeListener<Number>() {
@Override public void changed(ObservableValue<? extends Number> ov, Number oldY, Number y) {
rectangle.setY((double) y - rectangle.getHeight() );
Coins.set(1, (double) y);
}
});
anchors.add(new Anchor(Color.GOLD, xPropertyM, yPropertyM));
return anchors;
}
//a draggable anchor displayed around a point.
class Anchor extends Circle {
private final DoubleProperty x, y;
Anchor(Color color, DoubleProperty x, DoubleProperty y) {
super(x.get(), y.get(), 20);
setFill(color.deriveColor(1, 1, 1, 0.5));
setStroke(color);
setStrokeWidth(2);
setStrokeType(StrokeType.OUTSIDE);
this.x = x;
this.y = y;
x.bind(centerXProperty());
y.bind(centerYProperty());
enableDrag();
}
//make a node movable by dragging it around with the mouse.
private void enableDrag() {
final Delta dragDelta = new Delta();
setOnMousePressed(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
// record a delta distance for the drag and drop operation.
dragDelta.x = getCenterX() - mouseEvent.getX();
dragDelta.y = getCenterY() - mouseEvent.getY();
getScene().setCursor(Cursor.MOVE);
}
});
setOnMouseReleased(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
getScene().setCursor(Cursor.HAND);
}
});
setOnMouseDragged(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
double newX = mouseEvent.getX() + dragDelta.x;
if (newX > 0 && newX < getScene().getWidth()) {
setCenterX(newX);
}
double newY = mouseEvent.getY() + dragDelta.y;
if (newY > 0 && newY < getScene().getHeight()) {
setCenterY(newY);
}
//Recompute screen;
group.getChildren().add(rectangle);
scene = new Scene(group,800,800);;
primaryStage.setScene(scene);
}
});
setOnMouseEntered(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
if (!mouseEvent.isPrimaryButtonDown()) {
getScene().setCursor(Cursor.HAND);
}
}
});
setOnMouseExited(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
if (!mouseEvent.isPrimaryButtonDown()) {
getScene().setCursor(Cursor.DEFAULT);
}
}
});
}
//records relative x and y co-ordinates.
private class Delta { double x, y; }
}
}
任何想法，内容和地点我应该添加一些东西吗？
Any idea, what and where I should add something ?
推荐答案
由于句柄总是在相对于矩形的相同位置，我会绑定它们位置到矩形的位置。您可以使用
Since the "handles" are always in the same position relative to the rectangle, I would bind their position to the position of the rectangle. You can achieve this with
circle.centerXProperty().bind(...);
circle.centerYProperty().bind(...);
其中参数为 ObservableValue< Number> 。
然后在拖动处理程序中，根据需要移动 Rectangle （计算稍微复杂但不是太糟糕了）。由于圆圈的位置是绑定的，因此它们将遵循矩形。
Then in the dragging handlers, just move the Rectangle as required (the computations are slightly complex but not too bad). Since the positions of the circles are bound, they will follow the rectangle.
以下是使用此策略的一种可能实现：
Here's one possible implementation that uses this strategy:
import java.util.Arrays;
import javafx.application.Application;
import javafx.geometry.Point2D;
import javafx.scene.Cursor;
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.stage.Stage;
public class DraggingRectangle extends Application {
public static void main(String[] args) {
Application.launch(args);
}
@Override
public void start(Stage primaryStage) {
Pane root = new Pane();
Rectangle rect = createDraggableRectangle(200, 200, 400, 300);
rect.setFill(Color.NAVY);
root.getChildren().add(rect);
Scene scene = new Scene(root, 800, 800);
primaryStage.setScene(scene);
primaryStage.show();
}
private Rectangle createDraggableRectangle(double x, double y, double width, double height) {
final double handleRadius = 10 ;
Rectangle rect = new Rectangle(x, y, width, height);
// top left resize handle:
Circle resizeHandleNW = new Circle(handleRadius, Color.GOLD);
// bind to top left corner of Rectangle:
resizeHandleNW.centerXProperty().bind(rect.xProperty());
resizeHandleNW.centerYProperty().bind(rect.yProperty());
// bottom right resize handle:
Circle resizeHandleSE = new Circle(handleRadius, Color.GOLD);
// bind to bottom right corner of Rectangle:
resizeHandleSE.centerXProperty().bind(rect.xProperty().add(rect.widthProperty()));
resizeHandleSE.centerYProperty().bind(rect.yProperty().add(rect.heightProperty()));
// move handle:
Circle moveHandle = new Circle(handleRadius, Color.GOLD);
// bind to bottom center of Rectangle:
moveHandle.centerXProperty().bind(rect.xProperty().add(rect.widthProperty().divide(2)));
moveHandle.centerYProperty().bind(rect.yProperty().add(rect.heightProperty()));
// force circles to live in same parent as rectangle:
rect.parentProperty().addListener((obs, oldParent, newParent) -> {
for (Circle c : Arrays.asList(resizeHandleNW, resizeHandleSE, moveHandle)) {
Pane currentParent = (Pane)c.getParent();
if (currentParent != null) {
currentParent.getChildren().remove(c);
}
((Pane)newParent).getChildren().add(c);
}
});
Wrapper<Point2D> mouseLocation = new Wrapper<>();
setUpDragging(resizeHandleNW, mouseLocation) ;
setUpDragging(resizeHandleSE, mouseLocation) ;
setUpDragging(moveHandle, mouseLocation) ;
resizeHandleNW.setOnMouseDragged(event -> {
if (mouseLocation.value != null) {
double deltaX = event.getSceneX() - mouseLocation.value.getX();
double deltaY = event.getSceneY() - mouseLocation.value.getY();
double newX = rect.getX() + deltaX ;
if (newX >= handleRadius
&& newX <= rect.getX() + rect.getWidth() - handleRadius) {
rect.setX(newX);
rect.setWidth(rect.getWidth() - deltaX);
}
double newY = rect.getY() + deltaY ;
if (newY >= handleRadius
&& newY <= rect.getY() + rect.getHeight() - handleRadius) {
rect.setY(newY);
rect.setHeight(rect.getHeight() - deltaY);
}
mouseLocation.value = new Point2D(event.getSceneX(), event.getSceneY());
}
});
resizeHandleSE.setOnMouseDragged(event -> {
if (mouseLocation.value != null) {
double deltaX = event.getSceneX() - mouseLocation.value.getX();
double deltaY = event.getSceneY() - mouseLocation.value.getY();
double newMaxX = rect.getX() + rect.getWidth() + deltaX ;
if (newMaxX >= rect.getX()
&& newMaxX <= rect.getParent().getBoundsInLocal().getWidth() - handleRadius) {
rect.setWidth(rect.getWidth() + deltaX);
}
double newMaxY = rect.getY() + rect.getHeight() + deltaY ;
if (newMaxY >= rect.getY()
&& newMaxY <= rect.getParent().getBoundsInLocal().getHeight() - handleRadius) {
rect.setHeight(rect.getHeight() + deltaY);
}
mouseLocation.value = new Point2D(event.getSceneX(), event.getSceneY());
}
});
moveHandle.setOnMouseDragged(event -> {
if (mouseLocation.value != null) {
double deltaX = event.getSceneX() - mouseLocation.value.getX();
double deltaY = event.getSceneY() - mouseLocation.value.getY();
double newX = rect.getX() + deltaX ;
double newMaxX = newX + rect.getWidth();
if (newX >= handleRadius
&& newMaxX <= rect.getParent().getBoundsInLocal().getWidth() - handleRadius) {
rect.setX(newX);
}
double newY = rect.getY() + deltaY ;
double newMaxY = newY + rect.getHeight();
if (newY >= handleRadius
&& newMaxY <= rect.getParent().getBoundsInLocal().getHeight() - handleRadius) {
rect.setY(newY);
}
mouseLocation.value = new Point2D(event.getSceneX(), event.getSceneY());
}
});
return rect ;
}
private void setUpDragging(Circle circle, Wrapper<Point2D> mouseLocation) {
circle.setOnDragDetected(event -> {
circle.getParent().setCursor(Cursor.CLOSED_HAND);
mouseLocation.value = new Point2D(event.getSceneX(), event.getSceneY());
});
circle.setOnMouseReleased(event -> {
circle.getParent().setCursor(Cursor.DEFAULT);
mouseLocation.value = null ;
});
}
static class Wrapper<T> { T value ; }
}
这篇关于可调整大小的可移动矩形的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！