此代码绘制XYChart并使用鼠标右键单击和拖动的组合执行自由手绘，而用鼠标左键单击并拖动在选定区域执行放大。
我的问题是关于徒手绘制的缩放它总是得到翻译。例如，尝试在拐角处绘制某个地方。
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
}
}
答案 0 :(得分：3)
与Javafx 2 chart resize with freehand draw相同的问题和相同的答案：
看来你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，并且只能使用此节点的坐标，而不是轴或场景。
我甚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工具调查您的应用程序，看看哪些节点有什么坐标并验证您的数学。
答案 1 :(得分：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;
}
使用Node.localToScene，Node.sceneToLocal转换方法，将点数或边数作为参数。