我仍在为这个我无法解决的难题而苦苦挣扎：下面的代码通过鼠标左键单击并在图表上拖动（从左上到右）执行缩放（放大），并从右到左恢复形式。
鼠标右键单击并拖动执行徒手绘制：问题是，如果我绘制然后缩放，绘制的内容会被替换，而不是我之前绘制的位置。
如何解决这个问题？
谢谢
这是代码：
public class Zoom extends Application {
Path path;//Add path for freehand
BorderPane pane;
Rectangle rect;
SimpleDoubleProperty rectinitX = new SimpleDoubleProperty();
SimpleDoubleProperty rectinitY = new SimpleDoubleProperty();
SimpleDoubleProperty rectX = new SimpleDoubleProperty();
SimpleDoubleProperty rectY = new SimpleDoubleProperty();
double initXLowerBound = 0, initXUpperBound = 0, initYLowerBound = 0, initYUpperBound = 0;
@Override
public void start(Stage stage) {
stage.setTitle("Lines plot");
//final CategoryAxis xAxis = new CategoryAxis();
final NumberAxis xAxis = new NumberAxis(1, 12, 1);
final NumberAxis yAxis = new NumberAxis(0.53000, 0.53910, 0.0005);
yAxis.setTickLabelFormatter(new NumberAxis.DefaultFormatter(yAxis) {
@Override
public String toString(Number object) {
return String.format("%7.5f", object);
}
});
final LineChart<Number, Number> lineChart = new LineChart<Number, Number>(xAxis, yAxis);
lineChart.setCreateSymbols(false);
lineChart.setAlternativeRowFillVisible(false);
lineChart.setAnimated(true);
XYChart.Series series1 = new XYChart.Series();
series1.getData().add(new XYChart.Data(1, 0.53185));
series1.getData().add(new XYChart.Data(2, 0.532235));
series1.getData().add(new XYChart.Data(3, 0.53234));
series1.getData().add(new XYChart.Data(4, 0.538765));
series1.getData().add(new XYChart.Data(5, 0.53442));
series1.getData().add(new XYChart.Data(6, 0.534658));
series1.getData().add(new XYChart.Data(7, 0.53023));
series1.getData().add(new XYChart.Data(8, 0.53001));
series1.getData().add(new XYChart.Data(9, 0.53589));
series1.getData().add(new XYChart.Data(10, 0.53476));
series1.getData().add(new XYChart.Data(11, 0.530123));
series1.getData().add(new XYChart.Data(12, 0.53035));
pane = new BorderPane();
pane.setCenter(lineChart);
// Scene scene = new Scene(lineChart, 800, 600);
Scene scene = new Scene(pane, 800, 600);
lineChart.getData().addAll(series1);
initXLowerBound = ((NumberAxis) lineChart.getXAxis()).getLowerBound();
initXUpperBound = ((NumberAxis) lineChart.getXAxis()).getUpperBound();
initYLowerBound = ((NumberAxis) lineChart.getYAxis()).getLowerBound();
initYUpperBound = ((NumberAxis) lineChart.getYAxis()).getUpperBound();
stage.setScene(scene);
path = new Path();
path.setStrokeWidth(1);
path.setStroke(Color.BLACK);
scene.setOnMouseClicked(mouseHandler);
scene.setOnMouseDragged(mouseHandler);
scene.setOnMouseEntered(mouseHandler);
scene.setOnMouseExited(mouseHandler);
scene.setOnMouseMoved(mouseHandler);
scene.setOnMousePressed(mouseHandler);
scene.setOnMouseReleased(mouseHandler);
//root.getChildren().add(lineChart);
pane.getChildren().add(path);
rect = new Rectangle();
rect.setFill(Color.web("blue", 0.1));
rect.setStroke(Color.BLUE);
rect.setStrokeDashOffset(50);
rect.widthProperty().bind(rectX.subtract(rectinitX));
rect.heightProperty().bind(rectY.subtract(rectinitY));
pane.getChildren().add(rect);
stage.show();
}
// sum layout shift against parent until we ascend to scene
EventHandler<MouseEvent> mouseHandler = new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent mouseEvent) {
if (mouseEvent.getButton() == MouseButton.PRIMARY) {
if (mouseEvent.getEventType() == MouseEvent.MOUSE_PRESSED) {
rect.setX(mouseEvent.getX());
rect.setY(mouseEvent.getY());
rectinitX.set(mouseEvent.getX());
rectinitY.set(mouseEvent.getY());
} else if (mouseEvent.getEventType() == MouseEvent.MOUSE_DRAGGED) {
rectX.set(mouseEvent.getX());
rectY.set(mouseEvent.getY());
} else if (mouseEvent.getEventType() == MouseEvent.MOUSE_RELEASED) {
if ((rectinitX.get() >= rectX.get()) && (rectinitY.get() >= rectY.get())) {
//Condizioni Iniziali
LineChart<Number, Number> lineChart = (LineChart<Number, Number>) pane.getCenter();
((NumberAxis) lineChart.getXAxis()).setLowerBound(initXLowerBound);
((NumberAxis) lineChart.getXAxis()).setUpperBound(initXUpperBound);
((NumberAxis) lineChart.getYAxis()).setLowerBound(initYLowerBound);
((NumberAxis) lineChart.getYAxis()).setUpperBound(initYUpperBound);
ZoomFreeHand(path, 1.0, 1.0, 0, 0);
} else {
//Zoom In
double Tgap = 0;
double newLowerBound, newUpperBound, axisShift;
double xScaleFactor, yScaleFactor;
double xaxisShift, yaxisShift;
// System.out.println("Zoom bounds : [" + rectinitX.get() + ", " +rectinitY.get()
// + "] ["+ rectX.get()+", "+rectY.get()+"]");
// System.out.println("TODO: Determine bound ranges according these zoom coordinates.\n");
// TODO: Determine bound ranges according this zoom coordinates.
//LineChart<String, Number> lineChart = (LineChart<String, Number>) pane.getCenter();
LineChart<Number, Number> lineChart = (LineChart<Number, Number>) pane.getCenter();
// Zoom in Y-axis by changing bound range.
NumberAxis yAxis = (NumberAxis) lineChart.getYAxis();
Tgap = yAxis.getHeight()/(yAxis.getUpperBound() - yAxis.getLowerBound());
axisShift = getSceneShiftY(yAxis);
yaxisShift = axisShift;
newUpperBound = yAxis.getUpperBound() - ((rectinitY.get() - axisShift) / Tgap);
newLowerBound = yAxis.getUpperBound() - (( rectY.get() - axisShift) / Tgap);
// System.out.println("(a) rectinitY.get() "+rectinitY.get()+" rectY.get() "+rectY.get());
// System.out.println("(a) Tgap "+Tgap+" axisShift "+axisShift+" yAxis.getLowerBound() "
// + yAxis.getLowerBound()+ " " + yAxis.getUpperBound());
if (newUpperBound > yAxis.getUpperBound())
newUpperBound = yAxis.getUpperBound();
yScaleFactor = (yAxis.getUpperBound() - yAxis.getLowerBound())/(newUpperBound - newLowerBound);
yAxis.setLowerBound(newLowerBound);
yAxis.setUpperBound(newUpperBound);
// System.out.println("(b) yAxis.getLowerBound() " + yAxis.getLowerBound()+ " "
// + yAxis.getUpperBound());
// Zoom in X-axis by removing first and last data values.
// Note: Maybe better if categoryaxis is replaced by numberaxis then setting the
// LowerBound and UpperBound will be avaliable.
/*
XYChart.Series series1 = lineChart.getData().get(0);
if (!series1.getData().isEmpty()) {
series1.getData().remove(0);
series1.getData().remove(series1.getData().size() - 1);
}
*/
NumberAxis xAxis = (NumberAxis) lineChart.getXAxis();
// System.out.println("(a) xAxis.getLowerBound() " + xAxis.getLowerBound()+ " "
// + xAxis.getUpperBound());
Tgap = xAxis.getWidth()/(xAxis.getUpperBound() - xAxis.getLowerBound());
// newXlower = (rectinitX.get()/Tgap) + xAxis.getLowerBound();
// newXupper = (rectX.get()/Tgap)+xAxis.getLowerBound();
axisShift = getSceneShiftX(xAxis);
xaxisShift = axisShift;
newLowerBound = ((rectinitX.get() - axisShift) / Tgap) + xAxis.getLowerBound();
newUpperBound = ((rectX.get() - axisShift) / Tgap) + xAxis.getLowerBound();
if (newUpperBound > xAxis.getUpperBound())
newUpperBound = xAxis.getUpperBound();
xScaleFactor = (xAxis.getUpperBound() - xAxis.getLowerBound())/(newUpperBound - newLowerBound);
xAxis.setLowerBound( newLowerBound );
xAxis.setUpperBound( newUpperBound );
// System.out.println("(b) xAxis.getLowerBound() "+xAxis.getLowerBound()+" "+xAxis.getUpperBound());
ZoomFreeHand(path, xScaleFactor, yScaleFactor, xaxisShift, yaxisShift);
}
// Hide the rectangle
rectX.set(0);
rectY.set(0);
}
}// end if (mouseEvent.getButton() == MouseButton.PRIMARY)
else if (mouseEvent.getButton() == MouseButton.SECONDARY) //free hand graphics
{
if (mouseEvent.getEventType() == MouseEvent.MOUSE_PRESSED) {
path.getElements().clear();
path.getElements().add(new MoveTo(mouseEvent.getX(), mouseEvent.getY()));
} else if (mouseEvent.getEventType()==MouseEvent.MOUSE_DRAGGED) {
path.getElements().add(new LineTo(mouseEvent.getX(), mouseEvent.getY()));
}
} //end if (mouseEvent.getButton() == MouseButton.SECONDARY)
}
};
private static double getSceneShiftX(Node node) {
double shift = 0;
do {
shift += node.getLayoutX();
node = node.getParent();
} while (node != null);
return shift;
}
private static double getSceneShiftY(Node node) {
double shift = 0;
do {
shift += node.getLayoutY();
node = node.getParent();
} while (node != null);
return shift;
}
private static void ZoomFreeHand(Path path, double xScaleFactor, double yScaleFactor,
double xaxisShift, double yaxisShift) {
/*
ObservableList<PathElement> ListPath = path.getElements();
if (ListPath.size() != 0) {
MoveTo moveto;
((MoveTo)(ListPath.get(0))).setX(0-axisShiftX);
((MoveTo)(ListPath.get(0))).setY(0-axisShiftY);
}
*/
path.setScaleX(xScaleFactor);
path.setScaleY(yScaleFactor);
path.setTranslateX(xaxisShift);
path.setTranslateY(yaxisShift);
}
public static void main(String[] args) {
launch(args);
}
}
编辑：我有这个建议
尝试使用 Canvas 作为图表顶部的叠加层。然后，您可以缩放画布。
但不知道如何使用画布解决这个问题
Edit2：另一个建议
看来您的坐标是基于错误的锚点。您需要找到一个包含图形本身的节点，并且仅使用该节点的坐标，而不是轴或场景。我什至建议将所有鼠标事件添加到该节点而不是场景，以避免过度的坐标转换。另一个建议是使用 ScenicView 工具来调查您的应用程序并查看哪些节点具有哪些坐标并验证您的数学。
编辑 3：这些图片可能有助于更好地解释我的问题
