charts - JavaFX 2.x；在图表上绘制+缩放仍然存在问题

Question

我仍然在努力解决这个我无法解决的难题:下面的代码通过鼠标左键单击并在图表上拖动(从左上到右下)执行缩放(放大)，然后将表格从右下恢复到左上。

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，并且不是我之前绘制的位置。

如何解决这个问题？

谢谢

代码如下:

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 作为图表顶部的覆盖层。然后您只需缩放 Canvas 即可。

但不知道如何使用 Canvas 来解决这个问题

编辑2:另一个建议

看来您的坐标基于错误的 anchor 。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，以避免过多的坐标转换。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什么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

Answer 1

您正在谈论一个问题，即缩放时，绘图不是您期望的位置，是吗？

在ZoomFreeHand的代码中，移动轴的代码被注释掉了。

我希望，为了解决这个问题，你必须正确地移动轴。即使注释掉的代码不适合您，也需要正确计算和移动轴，以便您绘制的内容保持在您期望的位置。