7

此代码绘制一个 XYChart 并结合使用鼠标右键单击和拖动执行自由手绘，同时使用鼠标左键单击并拖动在选定区域上执行放大。

我的问题是关于手绘缩放它总是被翻译。例如，尝试在拐角处绘制。

我该如何解决这个问题？

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 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(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);

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();
}
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()))
                {
                    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;

                    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);


                    if (newUpperBound > yAxis.getUpperBound())
                        newUpperBound = yAxis.getUpperBound();

                    yScaleFactor = (yAxis.getUpperBound() - yAxis.getLowerBound())/(newUpperBound - newLowerBound);
                    yAxis.setLowerBound(newLowerBound);
                    yAxis.setUpperBound(newUpperBound);


                    NumberAxis xAxis = (NumberAxis) lineChart.getXAxis();

                    Tgap = xAxis.getWidth()/(xAxis.getUpperBound() - 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 );                      

                    ZoomFreeHand(path, xScaleFactor, yScaleFactor, xaxisShift, yaxisShift);
                }
                // Hide the rectangle
                rectX.set(0);
                rectY.set(0);
            }
    }
    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()));
        }
    } 
  }
  };
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) {

double layX, layY;

layX = path.getLayoutX();
layY = path.getLayoutY();
path.setScaleX(xScaleFactor);
path.setScaleY(yScaleFactor);
path.setTranslateX(xaxisShift);
path.setTranslateY(yaxisShift);
  }
  public static void main(String[] args) {
    launch(args);
   }        
  }

我认为值得使用这样的东西：

 ObservableList<PathElement> mypathElements = path.getElements();
 for (int i = 0; i < mypathElements.size(); i++) {
   final PathElement element = mypathElements.get(i);
   if (element instanceof MoveTo) {
     final MoveTo move = (MoveTo)element;
     //change move coordinates     
   } else if (element instanceof LineTo) {
   final LineTo line = (LineTo)element;                                    
   //change line coordinates
   }
 }
4

2 回答 2

3

与Javafx 2 中使用手绘和相同答案调整图表大小的问题相同：

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。

于 2012-05-29T16:32:03.940 回答
1

我建议更换那些：

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;
}

with Node.localToScene,Node.sceneToLocal以点或边界为参数的转换方法。

于 2013-04-13T20:30:36.857 回答