获取平移和缩放节点的视口
Get Viewport of translated and scaled node
问:如何在变换和缩放节点的坐标中获取查看矩形?
代码附在下面,它基于此答案中的代码:
详情:
我有一个简单的窗格,BigGridPane
,其中包含一组正方形,均为 50x50。
我把它放在这个 PanAndZoomPane
结构中,它是从上面引用的答案中提取出来的。老实说,我不能完全理解 PanAndZoomPane
的实现。例如,我不清楚为什么它根本需要 ScrollPane
,但我没有深入研究没有它的尝试。
PanAndZoomPane
让我可以平移和缩放 BigGridPane。这很管用。
这个总结构涉及 4 个窗格,在这个层次结构中:ScrollPane
包含 PanAndZoomPane
,其中 Group
包含 BigGridPane
。
ScrollPane
PanAndZoomPane
Group
BigGridPane
我已经将听众放在所有这些的 boundsInLocalProperty
和 boundsInParentProperty
上,其中唯一一个在平移和缩放时发生变化的是 boundsInParentProperty
PanAndZoomPane
。 (出于某种原因,我看到它在滚动窗格上触发,但所有值都是相同的,所以我不在此处包含它)。
随着 boundsInParentProperty
的变化,PanAndZoomPane
的 translateX
、translateY
和 myScale
属性也会随着事物的移动而变化。当然,这是预料之中的。 myScale
绑定到 PanAndZoomPane
.
的 scaleX
和 scaleY
属性
这是启动时的样子。
如果我如图所示平移网格,将 2-2 放在左上角:
我们可以看到PanAndZoomPane
.
的属性
panAndZoom in parent: BoundingBox [minX:-99.5, minY:-99.5, minZ:0.0,
width:501.5, height:501.5, depth:0.0,
maxX:402.0, maxY:402.0, maxZ:0.0]
paz scale = 1.0 - tx: -99.0 - ty: -99.0
比例为 1(无缩放),我们翻译了 ~100x100。也就是说,BigGridPane
的原点在 -100,-100。这一切都是完全有道理的。同样,边界框显示相同的东西。原点在-100,-100。
在这种情况下,我想派生一个矩形,显示我在 window 中看到的内容,在 BigGridPane
的坐标中。那将意味着
的矩形
x:100 y:100 width:250 height:250
通常情况下,我认为这将是 ScrollPane 的视口,但由于此代码实际上并未使用 ScrollPane 进行滚动(同样,我不太清楚它在这里的作用),ScrollPane视口永远不会改变。
我应该注意到,由于我 mac 上的视网膜显示器,现在正在发生恶作剧。如果你看一下显示 5x5 的矩形,它们是 50x50 的矩形,所以我们应该看到 10x10,但由于我的 iMac 上的 Retina 显示器,一切都加倍了。我们在 BigGridPane
坐标中看到的是一个由 5 个正方形组成的 250x250 块,偏移量为 100x100。这是在 500x500 的 window 中显示的事实,这是一个细节(但我们可以忽略的不太可能)。
但重申一下我的问题是什么,这就是我想要得到的:100x100 处的 250x250 正方形。
奇怪的是它偏移了 100x100,即使框架是两倍大(500 对 250)。如果我平移到左上角 1-1 的位置,则偏移量为 -50,-50,就像它应该的那样。
现在,让我们添加缩放,然后再次平移到 2-2。
单击滚轮 1 次,刻度跳至 1.5。
panAndZoom in parent: BoundingBox [minX:-149.375, minY:-150.375, minZ:0.0,
width:752.25, height:752.25, depth:0.0,
maxX:602.875, maxY:601.875, maxZ:0.0]
paz scale = 1.5 - tx: -23.375 - ty: -24.375
在这种情况下,我再次想要的是 BigGridPane
坐标中的矩形。大致:
x:100 y:100 w:150 h:150
我们看到我们偏移了 2x2 个框 (100x100),我们看到 3+ 个框 (150x150)。
所以。回到边界框。 MinX 和 minY = -150,-150。这很好。 100 x 1.5 = 150。同样宽度和高度为750。500 x 1.5 = 750。所以,这很好。
翻译是我们离开 rails 的地方。 -23.375,-24.375。我不知道这些数字是从哪里来的。我似乎无法将它们与 100、150、1.5 变焦等相关联。
更糟糕的是,如果我们平移(仍然以 1.5 比例)到“0,0”,之前,在比例 = 1 时,tx 和 ty 都是 0。这很好。
panAndZoom in parent: BoundingBox [minX:0.625, minY:0.625, minZ:0.0,
width:752.25, height:752.25, depth:0.0,
maxX:752.875, maxY:752.875, maxZ:0.0]
paz scale = 1.5 - tx: 126.625 - ty: 126.625
现在,它们是 126.625(可能应四舍五入为 125)。我不知道这些数字是从哪里来的。
我已经对这些数字进行了各种尝试,以了解这些数字的来源。
JavaFX 知道数字是多少! (即使整个视网膜的东西有点让我头疼,我暂时会忽略它)。
而且我在任何窗格的变换中都看不到任何东西。
所以,我的坐标系遍布整个地图,我想知道我的 BigGridPane
的哪一部分显示在我的平移和缩放视图中。
代码:
package pkg;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.geometry.Bounds;
import javafx.geometry.Point2D;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.ScrollPane;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.ScrollEvent;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
import javafx.scene.layout.Region;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.util.Duration;
public class PanZoomTest extends Application {
private ScrollPane scrollPane = new ScrollPane();
private final DoubleProperty zoomProperty = new SimpleDoubleProperty(1.0d);
private final DoubleProperty deltaY = new SimpleDoubleProperty(0.0d);
private final Group group = new Group();
PanAndZoomPane panAndZoomPane = null;
BigGridPane1 bigGridPane = new BigGridPane1(10, 10, 50);
@Override
public void start(Stage primaryStage) throws Exception {
scrollPane.setPannable(true);
scrollPane.setHbarPolicy(ScrollPane.ScrollBarPolicy.NEVER);
scrollPane.setVbarPolicy(ScrollPane.ScrollBarPolicy.NEVER);
group.getChildren().add(bigGridPane);
panAndZoomPane = new PanAndZoomPane();
zoomProperty.bind(panAndZoomPane.myScale);
deltaY.bind(panAndZoomPane.deltaY);
panAndZoomPane.getChildren().add(group);
SceneGestures sceneGestures = new SceneGestures(panAndZoomPane);
scrollPane.setContent(panAndZoomPane);
panAndZoomPane.toBack();
addListeners("panAndZoom", panAndZoomPane);
scrollPane.addEventFilter(MouseEvent.MOUSE_PRESSED, sceneGestures.getOnMousePressedEventHandler());
scrollPane.addEventFilter(MouseEvent.MOUSE_DRAGGED, sceneGestures.getOnMouseDraggedEventHandler());
scrollPane.addEventFilter(ScrollEvent.ANY, sceneGestures.getOnScrollEventHandler());
AnchorPane anchorPane = new AnchorPane();
anchorPane.getChildren().add(scrollPane);
anchorPane.setTopAnchor(scrollPane, 1.0d);
anchorPane.setRightAnchor(scrollPane, 1.0d);
anchorPane.setBottomAnchor(scrollPane, 1.0d);
anchorPane.setLeftAnchor(scrollPane, 1.0d);
BorderPane root = new BorderPane(anchorPane);
Label label = new Label("Pan and Zoom Test");
root.setTop(label);
Scene scene = new Scene(root, 250, 250);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
private void addListeners(String label, Node node) {
node.boundsInLocalProperty().addListener((o) -> {
System.out.println(label + " in local: " + node.getBoundsInLocal());
});
node.boundsInParentProperty().addListener((o) -> {
System.out.println(label + " in parent: " + node.getBoundsInParent());
System.out.println("paz scale = " + panAndZoomPane.getScale() + " - "
+ panAndZoomPane.getTranslateX() + " - "
+ panAndZoomPane.getTranslateY());
System.out.println(group.getTransforms());
});
}
class BigGridPane extends Region {
int rows;
int cols;
int size;
Font numFont = Font.font("sans-serif", 8);
FontMetrics numMetrics = new FontMetrics(numFont);
public BigGridPane(int cols, int rows, int size) {
this.rows = rows;
this.cols = cols;
this.size = size;
int sizeX = cols * size;
int sizeY = rows * size;
setMinSize(sizeX, sizeY);
setMaxSize(sizeX, sizeY);
setPrefSize(sizeX, sizeY);
populate();
}
@Override
protected void layoutChildren() {
System.out.println("grid layout");
super.layoutChildren();
}
private void populate() {
ObservableList<Node> children = getChildren();
children.clear();
for (int i = 0; i < cols; i++) {
for (int j = 0; j < rows; j++) {
Rectangle r = new Rectangle(i * size, j * size, size, size);
r.setFill(null);
r.setStroke(Color.BLACK);
String label = i + "-" + j;
Point2D p = new Point2D(r.getBoundsInLocal().getCenterX(), r.getBoundsInLocal().getCenterY());
Text t = new Text(label);
t.setX(p.getX() - numMetrics.computeStringWidth(label) / 2);
t.setY(p.getY() + numMetrics.getLineHeight() / 2);
t.setFont(numFont);
children.add(r);
children.add(t);
}
}
}
}
class PanAndZoomPane extends Pane {
public static final double DEFAULT_DELTA = 1.5d; //1.3d
DoubleProperty myScale = new SimpleDoubleProperty(1.0);
public DoubleProperty deltaY = new SimpleDoubleProperty(0.0);
private Timeline timeline;
public PanAndZoomPane() {
this.timeline = new Timeline(30);//60
// add scale transform
scaleXProperty().bind(myScale);
scaleYProperty().bind(myScale);
}
public double getScale() {
return myScale.get();
}
public void setScale(double scale) {
myScale.set(scale);
}
public void setPivot(double x, double y, double scale) {
// note: pivot value must be untransformed, i. e. without scaling
// timeline that scales and moves the node
timeline.getKeyFrames().clear();
timeline.getKeyFrames().addAll(
new KeyFrame(Duration.millis(200), new KeyValue(translateXProperty(), getTranslateX() - x)), //200
new KeyFrame(Duration.millis(200), new KeyValue(translateYProperty(), getTranslateY() - y)), //200
new KeyFrame(Duration.millis(200), new KeyValue(myScale, scale)) //200
);
timeline.play();
}
public double getDeltaY() {
return deltaY.get();
}
public void setDeltaY(double dY) {
deltaY.set(dY);
}
}
/**
* Mouse drag context used for scene and nodes.
*/
class DragContext {
double mouseAnchorX;
double mouseAnchorY;
double translateAnchorX;
double translateAnchorY;
}
/**
* Listeners for making the scene's canvas draggable and zoomable
*/
public class SceneGestures {
private DragContext sceneDragContext = new DragContext();
PanAndZoomPane panAndZoomPane;
public SceneGestures(PanAndZoomPane canvas) {
this.panAndZoomPane = canvas;
}
public EventHandler<MouseEvent> getOnMousePressedEventHandler() {
return onMousePressedEventHandler;
}
public EventHandler<MouseEvent> getOnMouseDraggedEventHandler() {
return onMouseDraggedEventHandler;
}
public EventHandler<ScrollEvent> getOnScrollEventHandler() {
return onScrollEventHandler;
}
private EventHandler<MouseEvent> onMousePressedEventHandler = new EventHandler<MouseEvent>() {
public void handle(MouseEvent event) {
sceneDragContext.mouseAnchorX = event.getX();
sceneDragContext.mouseAnchorY = event.getY();
sceneDragContext.translateAnchorX = panAndZoomPane.getTranslateX();
sceneDragContext.translateAnchorY = panAndZoomPane.getTranslateY();
}
};
private EventHandler<MouseEvent> onMouseDraggedEventHandler = new EventHandler<MouseEvent>() {
public void handle(MouseEvent event) {
panAndZoomPane.setTranslateX(sceneDragContext.translateAnchorX + event.getX() - sceneDragContext.mouseAnchorX);
panAndZoomPane.setTranslateY(sceneDragContext.translateAnchorY + event.getY() - sceneDragContext.mouseAnchorY);
event.consume();
}
};
/**
* Mouse wheel handler: zoom to pivot point
*/
private EventHandler<ScrollEvent> onScrollEventHandler = new EventHandler<ScrollEvent>() {
@Override
public void handle(ScrollEvent event) {
double delta = PanAndZoomPane.DEFAULT_DELTA;
double scale = panAndZoomPane.getScale(); // currently we only use Y, same value is used for X
double oldScale = scale;
panAndZoomPane.setDeltaY(event.getDeltaY());
if (panAndZoomPane.deltaY.get() < 0) {
scale /= delta;
} else {
scale *= delta;
}
double f = (scale / oldScale) - 1;
double dx = (event.getX() - (panAndZoomPane.getBoundsInParent().getWidth() / 2 + panAndZoomPane.getBoundsInParent().getMinX()));
double dy = (event.getY() - (panAndZoomPane.getBoundsInParent().getHeight() / 2 + panAndZoomPane.getBoundsInParent().getMinY()));
panAndZoomPane.setPivot(f * dx, f * dy, scale);
event.consume();
}
};
}
class FontMetrics {
final private Text internal;
public float lineHeight;
public FontMetrics(Font fnt) {
internal = new Text();
internal.setFont(fnt);
Bounds b = internal.getLayoutBounds();
lineHeight = (float) b.getHeight();
}
public float computeStringWidth(String txt) {
internal.setText(txt);
return (float) internal.getLayoutBounds().getWidth();
}
public float getLineHeight() {
return lineHeight;
}
}
}
一般情况下,在node2
的坐标系中,如果两者在同一场景中,则可以使用
获取node1
的边界
node2.sceneToLocal(node1.localToScene(node1.getBoundsInLocal()));
我不明白你发布的所有代码;当您似乎自己实现所有平移和缩放时,我真的不知道为什么要使用滚动窗格。这是一个更简单的 PanZoomPane
版本,然后是一个测试,它展示了如何使用上面的想法在 panning/zooming 内容的坐标系中获取视口的边界。 “视口”只是内容坐标系中 panning/zooming 窗格的边界。
如果您需要在您的平移和缩放版本中添加其他功能,您应该能够使这个想法适应那个;但是我要花很长时间才能理解你在那里所做的一切。
import javafx.geometry.Point2D;
import javafx.scene.Node;
import javafx.scene.layout.Region;
import javafx.scene.shape.Rectangle;
import javafx.scene.transform.Affine;
import javafx.scene.transform.Transform;
public class PanZoomPane extends Region {
private final Node content ;
private final Rectangle clip ;
private Affine transform ;
private Point2D mouseDown ;
private static final double SCALE = 1.01 ; // zoom factor per pixel scrolled
public PanZoomPane(Node content) {
this.content = content ;
getChildren().add(content);
clip = new Rectangle();
setClip(clip);
transform = Affine.affine(1, 0, 0, 1, 0, 0);
content.getTransforms().setAll(transform);
content.setOnMousePressed(event -> mouseDown = new Point2D(event.getX(), event.getY()));
content.setOnMouseDragged(event -> {
double deltaX = event.getX() - mouseDown.getX();
double deltaY = event.getY() - mouseDown.getY();
translate(deltaX, deltaY);
});
content.setOnScroll(event -> {
double pivotX = event.getX();
double pivotY = event.getY();
double scale = Math.pow(SCALE, event.getDeltaY());
scale(pivotX, pivotY, scale);
});
}
public Node getContent() {
return content ;
}
@Override
protected void layoutChildren() {
clip.setWidth(getWidth());
clip.setHeight(getHeight());
}
public void scale(double pivotX, double pivotY, double scale) {
transform.append(Transform.scale(scale, scale, pivotX, pivotY));
}
public void translate(double x, double y) {
transform.append(Transform.translate(x, y));
}
public void reset() {
transform.setToIdentity();
}
}
import javafx.application.Application;
import javafx.beans.binding.Binding;
import javafx.beans.binding.ObjectBinding;
import javafx.geometry.Bounds;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.geometry.VPos;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.RowConstraints;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class PanZoomTest extends Application {
private Binding<Bounds> viewport ;
@Override
public void start(Stage stage) {
Node content = createContent(50, 50, 50) ;
PanZoomPane pane = new PanZoomPane(content);
viewport = new ObjectBinding<>() {
{
bind(
pane.localToSceneTransformProperty(),
pane.boundsInLocalProperty(),
content.localToSceneTransformProperty()
);
}
@Override
protected Bounds computeValue() {
return content.sceneToLocal(pane.localToScene(pane.getBoundsInLocal()));
}
};
viewport.addListener((obs, oldViewport, newViewport) -> System.out.println(newViewport));
BorderPane root = new BorderPane(pane);
Button reset = new Button("Reset");
reset.setOnAction(event -> pane.reset());
HBox buttons = new HBox(reset);
buttons.setAlignment(Pos.CENTER);
buttons.setPadding(new Insets(10));
root.setTop(buttons);
Scene scene = new Scene(root, 800, 800);
stage.setScene(scene);
stage.show();
}
private Node createContent(int columns, int rows, double cellSize) {
GridPane grid = new GridPane() ;
ColumnConstraints cc = new ColumnConstraints();
cc.setMinWidth(cellSize);
cc.setPrefWidth(cellSize);
cc.setMaxWidth(cellSize);
cc.setFillWidth(true);
cc.setHalignment(HPos.CENTER);
for (int column = 0 ; column < columns ; column++) {
grid.getColumnConstraints().add(cc);
}
RowConstraints rc = new RowConstraints();
rc.setMinHeight(cellSize);
rc.setPrefHeight(cellSize);
rc.setMaxHeight(cellSize);
rc.setFillHeight(true);
rc.setValignment(VPos.CENTER);
for (int row = 0 ; row < rows ; row++) {
grid.getRowConstraints().add(rc);
}
for (int x = 0 ; x < columns ; x++) {
for (int y = 0 ; y < rows ; y++) {
Label label = new Label(String.format("[%d, %d]", x, y));
label.setBackground(new Background(
new BackgroundFill(Color.BLACK, CornerRadii.EMPTY, Insets.EMPTY),
new BackgroundFill(Color.WHITE, CornerRadii.EMPTY, new Insets(1,1,0,0))
));
label.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);
grid.add(label, x, y);
}
}
return grid ;
}
public static void main(String[] args) {
launch();
}
}
问:如何在变换和缩放节点的坐标中获取查看矩形?
代码附在下面,它基于此答案中的代码:
详情:
我有一个简单的窗格,BigGridPane
,其中包含一组正方形,均为 50x50。
我把它放在这个 PanAndZoomPane
结构中,它是从上面引用的答案中提取出来的。老实说,我不能完全理解 PanAndZoomPane
的实现。例如,我不清楚为什么它根本需要 ScrollPane
,但我没有深入研究没有它的尝试。
PanAndZoomPane
让我可以平移和缩放 BigGridPane。这很管用。
这个总结构涉及 4 个窗格,在这个层次结构中:ScrollPane
包含 PanAndZoomPane
,其中 Group
包含 BigGridPane
。
ScrollPane
PanAndZoomPane
Group
BigGridPane
我已经将听众放在所有这些的 boundsInLocalProperty
和 boundsInParentProperty
上,其中唯一一个在平移和缩放时发生变化的是 boundsInParentProperty
PanAndZoomPane
。 (出于某种原因,我看到它在滚动窗格上触发,但所有值都是相同的,所以我不在此处包含它)。
随着 boundsInParentProperty
的变化,PanAndZoomPane
的 translateX
、translateY
和 myScale
属性也会随着事物的移动而变化。当然,这是预料之中的。 myScale
绑定到 PanAndZoomPane
.
scaleX
和 scaleY
属性
这是启动时的样子。
如果我如图所示平移网格,将 2-2 放在左上角:
我们可以看到PanAndZoomPane
.
panAndZoom in parent: BoundingBox [minX:-99.5, minY:-99.5, minZ:0.0,
width:501.5, height:501.5, depth:0.0,
maxX:402.0, maxY:402.0, maxZ:0.0]
paz scale = 1.0 - tx: -99.0 - ty: -99.0
比例为 1(无缩放),我们翻译了 ~100x100。也就是说,BigGridPane
的原点在 -100,-100。这一切都是完全有道理的。同样,边界框显示相同的东西。原点在-100,-100。
在这种情况下,我想派生一个矩形,显示我在 window 中看到的内容,在 BigGridPane
的坐标中。那将意味着
x:100 y:100 width:250 height:250
通常情况下,我认为这将是 ScrollPane 的视口,但由于此代码实际上并未使用 ScrollPane 进行滚动(同样,我不太清楚它在这里的作用),ScrollPane视口永远不会改变。
我应该注意到,由于我 mac 上的视网膜显示器,现在正在发生恶作剧。如果你看一下显示 5x5 的矩形,它们是 50x50 的矩形,所以我们应该看到 10x10,但由于我的 iMac 上的 Retina 显示器,一切都加倍了。我们在 BigGridPane
坐标中看到的是一个由 5 个正方形组成的 250x250 块,偏移量为 100x100。这是在 500x500 的 window 中显示的事实,这是一个细节(但我们可以忽略的不太可能)。
但重申一下我的问题是什么,这就是我想要得到的:100x100 处的 250x250 正方形。
奇怪的是它偏移了 100x100,即使框架是两倍大(500 对 250)。如果我平移到左上角 1-1 的位置,则偏移量为 -50,-50,就像它应该的那样。
现在,让我们添加缩放,然后再次平移到 2-2。
单击滚轮 1 次,刻度跳至 1.5。
panAndZoom in parent: BoundingBox [minX:-149.375, minY:-150.375, minZ:0.0,
width:752.25, height:752.25, depth:0.0,
maxX:602.875, maxY:601.875, maxZ:0.0]
paz scale = 1.5 - tx: -23.375 - ty: -24.375
在这种情况下,我再次想要的是 BigGridPane
坐标中的矩形。大致:
x:100 y:100 w:150 h:150
我们看到我们偏移了 2x2 个框 (100x100),我们看到 3+ 个框 (150x150)。
所以。回到边界框。 MinX 和 minY = -150,-150。这很好。 100 x 1.5 = 150。同样宽度和高度为750。500 x 1.5 = 750。所以,这很好。
翻译是我们离开 rails 的地方。 -23.375,-24.375。我不知道这些数字是从哪里来的。我似乎无法将它们与 100、150、1.5 变焦等相关联。
更糟糕的是,如果我们平移(仍然以 1.5 比例)到“0,0”,之前,在比例 = 1 时,tx 和 ty 都是 0。这很好。
panAndZoom in parent: BoundingBox [minX:0.625, minY:0.625, minZ:0.0,
width:752.25, height:752.25, depth:0.0,
maxX:752.875, maxY:752.875, maxZ:0.0]
paz scale = 1.5 - tx: 126.625 - ty: 126.625
现在,它们是 126.625(可能应四舍五入为 125)。我不知道这些数字是从哪里来的。
我已经对这些数字进行了各种尝试,以了解这些数字的来源。
JavaFX 知道数字是多少! (即使整个视网膜的东西有点让我头疼,我暂时会忽略它)。
而且我在任何窗格的变换中都看不到任何东西。
所以,我的坐标系遍布整个地图,我想知道我的 BigGridPane
的哪一部分显示在我的平移和缩放视图中。
代码:
package pkg;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.geometry.Bounds;
import javafx.geometry.Point2D;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.ScrollPane;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.ScrollEvent;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
import javafx.scene.layout.Region;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.util.Duration;
public class PanZoomTest extends Application {
private ScrollPane scrollPane = new ScrollPane();
private final DoubleProperty zoomProperty = new SimpleDoubleProperty(1.0d);
private final DoubleProperty deltaY = new SimpleDoubleProperty(0.0d);
private final Group group = new Group();
PanAndZoomPane panAndZoomPane = null;
BigGridPane1 bigGridPane = new BigGridPane1(10, 10, 50);
@Override
public void start(Stage primaryStage) throws Exception {
scrollPane.setPannable(true);
scrollPane.setHbarPolicy(ScrollPane.ScrollBarPolicy.NEVER);
scrollPane.setVbarPolicy(ScrollPane.ScrollBarPolicy.NEVER);
group.getChildren().add(bigGridPane);
panAndZoomPane = new PanAndZoomPane();
zoomProperty.bind(panAndZoomPane.myScale);
deltaY.bind(panAndZoomPane.deltaY);
panAndZoomPane.getChildren().add(group);
SceneGestures sceneGestures = new SceneGestures(panAndZoomPane);
scrollPane.setContent(panAndZoomPane);
panAndZoomPane.toBack();
addListeners("panAndZoom", panAndZoomPane);
scrollPane.addEventFilter(MouseEvent.MOUSE_PRESSED, sceneGestures.getOnMousePressedEventHandler());
scrollPane.addEventFilter(MouseEvent.MOUSE_DRAGGED, sceneGestures.getOnMouseDraggedEventHandler());
scrollPane.addEventFilter(ScrollEvent.ANY, sceneGestures.getOnScrollEventHandler());
AnchorPane anchorPane = new AnchorPane();
anchorPane.getChildren().add(scrollPane);
anchorPane.setTopAnchor(scrollPane, 1.0d);
anchorPane.setRightAnchor(scrollPane, 1.0d);
anchorPane.setBottomAnchor(scrollPane, 1.0d);
anchorPane.setLeftAnchor(scrollPane, 1.0d);
BorderPane root = new BorderPane(anchorPane);
Label label = new Label("Pan and Zoom Test");
root.setTop(label);
Scene scene = new Scene(root, 250, 250);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
private void addListeners(String label, Node node) {
node.boundsInLocalProperty().addListener((o) -> {
System.out.println(label + " in local: " + node.getBoundsInLocal());
});
node.boundsInParentProperty().addListener((o) -> {
System.out.println(label + " in parent: " + node.getBoundsInParent());
System.out.println("paz scale = " + panAndZoomPane.getScale() + " - "
+ panAndZoomPane.getTranslateX() + " - "
+ panAndZoomPane.getTranslateY());
System.out.println(group.getTransforms());
});
}
class BigGridPane extends Region {
int rows;
int cols;
int size;
Font numFont = Font.font("sans-serif", 8);
FontMetrics numMetrics = new FontMetrics(numFont);
public BigGridPane(int cols, int rows, int size) {
this.rows = rows;
this.cols = cols;
this.size = size;
int sizeX = cols * size;
int sizeY = rows * size;
setMinSize(sizeX, sizeY);
setMaxSize(sizeX, sizeY);
setPrefSize(sizeX, sizeY);
populate();
}
@Override
protected void layoutChildren() {
System.out.println("grid layout");
super.layoutChildren();
}
private void populate() {
ObservableList<Node> children = getChildren();
children.clear();
for (int i = 0; i < cols; i++) {
for (int j = 0; j < rows; j++) {
Rectangle r = new Rectangle(i * size, j * size, size, size);
r.setFill(null);
r.setStroke(Color.BLACK);
String label = i + "-" + j;
Point2D p = new Point2D(r.getBoundsInLocal().getCenterX(), r.getBoundsInLocal().getCenterY());
Text t = new Text(label);
t.setX(p.getX() - numMetrics.computeStringWidth(label) / 2);
t.setY(p.getY() + numMetrics.getLineHeight() / 2);
t.setFont(numFont);
children.add(r);
children.add(t);
}
}
}
}
class PanAndZoomPane extends Pane {
public static final double DEFAULT_DELTA = 1.5d; //1.3d
DoubleProperty myScale = new SimpleDoubleProperty(1.0);
public DoubleProperty deltaY = new SimpleDoubleProperty(0.0);
private Timeline timeline;
public PanAndZoomPane() {
this.timeline = new Timeline(30);//60
// add scale transform
scaleXProperty().bind(myScale);
scaleYProperty().bind(myScale);
}
public double getScale() {
return myScale.get();
}
public void setScale(double scale) {
myScale.set(scale);
}
public void setPivot(double x, double y, double scale) {
// note: pivot value must be untransformed, i. e. without scaling
// timeline that scales and moves the node
timeline.getKeyFrames().clear();
timeline.getKeyFrames().addAll(
new KeyFrame(Duration.millis(200), new KeyValue(translateXProperty(), getTranslateX() - x)), //200
new KeyFrame(Duration.millis(200), new KeyValue(translateYProperty(), getTranslateY() - y)), //200
new KeyFrame(Duration.millis(200), new KeyValue(myScale, scale)) //200
);
timeline.play();
}
public double getDeltaY() {
return deltaY.get();
}
public void setDeltaY(double dY) {
deltaY.set(dY);
}
}
/**
* Mouse drag context used for scene and nodes.
*/
class DragContext {
double mouseAnchorX;
double mouseAnchorY;
double translateAnchorX;
double translateAnchorY;
}
/**
* Listeners for making the scene's canvas draggable and zoomable
*/
public class SceneGestures {
private DragContext sceneDragContext = new DragContext();
PanAndZoomPane panAndZoomPane;
public SceneGestures(PanAndZoomPane canvas) {
this.panAndZoomPane = canvas;
}
public EventHandler<MouseEvent> getOnMousePressedEventHandler() {
return onMousePressedEventHandler;
}
public EventHandler<MouseEvent> getOnMouseDraggedEventHandler() {
return onMouseDraggedEventHandler;
}
public EventHandler<ScrollEvent> getOnScrollEventHandler() {
return onScrollEventHandler;
}
private EventHandler<MouseEvent> onMousePressedEventHandler = new EventHandler<MouseEvent>() {
public void handle(MouseEvent event) {
sceneDragContext.mouseAnchorX = event.getX();
sceneDragContext.mouseAnchorY = event.getY();
sceneDragContext.translateAnchorX = panAndZoomPane.getTranslateX();
sceneDragContext.translateAnchorY = panAndZoomPane.getTranslateY();
}
};
private EventHandler<MouseEvent> onMouseDraggedEventHandler = new EventHandler<MouseEvent>() {
public void handle(MouseEvent event) {
panAndZoomPane.setTranslateX(sceneDragContext.translateAnchorX + event.getX() - sceneDragContext.mouseAnchorX);
panAndZoomPane.setTranslateY(sceneDragContext.translateAnchorY + event.getY() - sceneDragContext.mouseAnchorY);
event.consume();
}
};
/**
* Mouse wheel handler: zoom to pivot point
*/
private EventHandler<ScrollEvent> onScrollEventHandler = new EventHandler<ScrollEvent>() {
@Override
public void handle(ScrollEvent event) {
double delta = PanAndZoomPane.DEFAULT_DELTA;
double scale = panAndZoomPane.getScale(); // currently we only use Y, same value is used for X
double oldScale = scale;
panAndZoomPane.setDeltaY(event.getDeltaY());
if (panAndZoomPane.deltaY.get() < 0) {
scale /= delta;
} else {
scale *= delta;
}
double f = (scale / oldScale) - 1;
double dx = (event.getX() - (panAndZoomPane.getBoundsInParent().getWidth() / 2 + panAndZoomPane.getBoundsInParent().getMinX()));
double dy = (event.getY() - (panAndZoomPane.getBoundsInParent().getHeight() / 2 + panAndZoomPane.getBoundsInParent().getMinY()));
panAndZoomPane.setPivot(f * dx, f * dy, scale);
event.consume();
}
};
}
class FontMetrics {
final private Text internal;
public float lineHeight;
public FontMetrics(Font fnt) {
internal = new Text();
internal.setFont(fnt);
Bounds b = internal.getLayoutBounds();
lineHeight = (float) b.getHeight();
}
public float computeStringWidth(String txt) {
internal.setText(txt);
return (float) internal.getLayoutBounds().getWidth();
}
public float getLineHeight() {
return lineHeight;
}
}
}
一般情况下,在node2
的坐标系中,如果两者在同一场景中,则可以使用
node1
的边界
node2.sceneToLocal(node1.localToScene(node1.getBoundsInLocal()));
我不明白你发布的所有代码;当您似乎自己实现所有平移和缩放时,我真的不知道为什么要使用滚动窗格。这是一个更简单的 PanZoomPane
版本,然后是一个测试,它展示了如何使用上面的想法在 panning/zooming 内容的坐标系中获取视口的边界。 “视口”只是内容坐标系中 panning/zooming 窗格的边界。
如果您需要在您的平移和缩放版本中添加其他功能,您应该能够使这个想法适应那个;但是我要花很长时间才能理解你在那里所做的一切。
import javafx.geometry.Point2D;
import javafx.scene.Node;
import javafx.scene.layout.Region;
import javafx.scene.shape.Rectangle;
import javafx.scene.transform.Affine;
import javafx.scene.transform.Transform;
public class PanZoomPane extends Region {
private final Node content ;
private final Rectangle clip ;
private Affine transform ;
private Point2D mouseDown ;
private static final double SCALE = 1.01 ; // zoom factor per pixel scrolled
public PanZoomPane(Node content) {
this.content = content ;
getChildren().add(content);
clip = new Rectangle();
setClip(clip);
transform = Affine.affine(1, 0, 0, 1, 0, 0);
content.getTransforms().setAll(transform);
content.setOnMousePressed(event -> mouseDown = new Point2D(event.getX(), event.getY()));
content.setOnMouseDragged(event -> {
double deltaX = event.getX() - mouseDown.getX();
double deltaY = event.getY() - mouseDown.getY();
translate(deltaX, deltaY);
});
content.setOnScroll(event -> {
double pivotX = event.getX();
double pivotY = event.getY();
double scale = Math.pow(SCALE, event.getDeltaY());
scale(pivotX, pivotY, scale);
});
}
public Node getContent() {
return content ;
}
@Override
protected void layoutChildren() {
clip.setWidth(getWidth());
clip.setHeight(getHeight());
}
public void scale(double pivotX, double pivotY, double scale) {
transform.append(Transform.scale(scale, scale, pivotX, pivotY));
}
public void translate(double x, double y) {
transform.append(Transform.translate(x, y));
}
public void reset() {
transform.setToIdentity();
}
}
import javafx.application.Application;
import javafx.beans.binding.Binding;
import javafx.beans.binding.ObjectBinding;
import javafx.geometry.Bounds;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.geometry.VPos;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.RowConstraints;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class PanZoomTest extends Application {
private Binding<Bounds> viewport ;
@Override
public void start(Stage stage) {
Node content = createContent(50, 50, 50) ;
PanZoomPane pane = new PanZoomPane(content);
viewport = new ObjectBinding<>() {
{
bind(
pane.localToSceneTransformProperty(),
pane.boundsInLocalProperty(),
content.localToSceneTransformProperty()
);
}
@Override
protected Bounds computeValue() {
return content.sceneToLocal(pane.localToScene(pane.getBoundsInLocal()));
}
};
viewport.addListener((obs, oldViewport, newViewport) -> System.out.println(newViewport));
BorderPane root = new BorderPane(pane);
Button reset = new Button("Reset");
reset.setOnAction(event -> pane.reset());
HBox buttons = new HBox(reset);
buttons.setAlignment(Pos.CENTER);
buttons.setPadding(new Insets(10));
root.setTop(buttons);
Scene scene = new Scene(root, 800, 800);
stage.setScene(scene);
stage.show();
}
private Node createContent(int columns, int rows, double cellSize) {
GridPane grid = new GridPane() ;
ColumnConstraints cc = new ColumnConstraints();
cc.setMinWidth(cellSize);
cc.setPrefWidth(cellSize);
cc.setMaxWidth(cellSize);
cc.setFillWidth(true);
cc.setHalignment(HPos.CENTER);
for (int column = 0 ; column < columns ; column++) {
grid.getColumnConstraints().add(cc);
}
RowConstraints rc = new RowConstraints();
rc.setMinHeight(cellSize);
rc.setPrefHeight(cellSize);
rc.setMaxHeight(cellSize);
rc.setFillHeight(true);
rc.setValignment(VPos.CENTER);
for (int row = 0 ; row < rows ; row++) {
grid.getRowConstraints().add(rc);
}
for (int x = 0 ; x < columns ; x++) {
for (int y = 0 ; y < rows ; y++) {
Label label = new Label(String.format("[%d, %d]", x, y));
label.setBackground(new Background(
new BackgroundFill(Color.BLACK, CornerRadii.EMPTY, Insets.EMPTY),
new BackgroundFill(Color.WHITE, CornerRadii.EMPTY, new Insets(1,1,0,0))
));
label.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);
grid.add(label, x, y);
}
}
return grid ;
}
public static void main(String[] args) {
launch();
}
}