在圖表區域之外添加內容的最好方法是繼承Region
並覆蓋layoutChildren
方法來佈置圖表和所需的額外內容。您可以使用ValueAxis.getDisplayPosition(value)
來獲取相對於座標軸的座標,然後使用一對變換來獲取相對於該區域的座標,從而確定特定「圖表值」的座標。
下面是一個簡單的例子:
import java.util.List;
import java.util.Random;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javafx.application.Application;
import javafx.geometry.Point2D;
import javafx.scene.Scene;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart.Data;
import javafx.scene.chart.XYChart.Series;
import javafx.scene.control.Tooltip;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Region;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
public class LineChartWithRightPanel extends Application {
private final Color[] RECT_COLORS =
new Color[] {Color.RED, Color.ORANGE, Color.YELLOW, Color.GREEN, Color.BLUE};
private final double RECT_WIDTH = 20 ;
@Override
public void start(Stage primaryStage) {
NumberAxis xAxis = new NumberAxis();
NumberAxis yAxis = new NumberAxis(0, 1, 0.2);
LineChart<Number, Number> chart = new LineChart<>(xAxis, yAxis);
Region chartWithPanel = new Region() {
private List<Rectangle> rectangles =
Stream.of(RECT_COLORS)
.map(c -> new Rectangle(RECT_WIDTH, 0, c))
.collect(Collectors.toList());
{
getChildren().add(chart);
getChildren().addAll(rectangles);
}
@Override
protected void layoutChildren() {
double w = getWidth();
double h = getHeight();
chart.resizeRelocate(0, 0, w-RECT_WIDTH, h);
chart.layout();
double chartMinY = yAxis.getLowerBound();
double chartMaxY = yAxis.getUpperBound();
double chartYRange = chartMaxY - chartMinY ;
for (int i = 0 ; i < rectangles.size(); i++) {
// easier ways to do this in this example,
// but this technique shows how to map "chart coords"
// to coords in this pane:
double rectMinYInChart = chartMinY + i * chartYRange/rectangles.size();
double rectMaxYInChart = chartMinY + (i+1) * chartYRange/rectangles.size();
double rectMinYInAxis = yAxis.getDisplayPosition(rectMinYInChart);
double rectMaxYInAxis = yAxis.getDisplayPosition(rectMaxYInChart);
double rectMinY = sceneToLocal(yAxis.localToScene(new Point2D(0, rectMinYInAxis))).getY();
double rectMaxY = sceneToLocal(yAxis.localToScene(new Point2D(0, rectMaxYInAxis))).getY();
rectangles.get(i).setHeight(Math.abs(rectMaxY - rectMinY));
rectangles.get(i).setX(w - RECT_WIDTH);
rectangles.get(i).setY(Math.min(rectMinY, rectMaxY));
Tooltip.install(rectangles.get(i),
new Tooltip(String.format("%.2f - %.2f", rectMinYInChart, rectMaxYInChart)));
}
}
};
Series<Number, Number> series = new Series<>();
series.setName("Data");
Random rng = new Random();
for (int i = 0; i < 20; i++) {
series.getData().add(new Data<>(i, rng.nextDouble()));
}
chart.getData().add(series);
BorderPane root = new BorderPane(chartWithPanel);
Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
![Screenshot of chart with colored bands on right](https://i.stack.imgur.com/Nv6WE.png)
注意,您可以使用同樣的想法得到整個繪圖區的範圍:
double minXInAxis = xAxis.getDisplayPosition(xAxis.getLowerBound());
double maxXInAxis = xAxis.getDisplayPosition(xAxis.getUpperBound());
double minYInAxis = yAxis.getDisplayPosition(yAxis.getLowerBound());
double maxYInAxis = yAxis.getDisplayPosition(yAxis.getUpperBound());
double minX = sceneToLocal(xAxis.localToScene(new Point2D(minXInAxis,0))).getX();
double maxX = sceneToLocal(xAxis.localToScene(new Point2D(maxXInAxis,0))).getX();
double minY = sceneToLocal(yAxis.localToScene(new Point2D(0,minYInAxis))).getY();
double maxY = sceneToLocal(yAxis.localToScene(new Point2D(0,maxYInAxis))).getY();
然後minX
,maxX
,minY
,maxY
定義了繪圖區域的邊界。
你爲什麼期望直接父母是圖表?如何管理圖表的內部佈局是您不應該關心的實現細節。這聽起來像是你正在使用錯誤的方法解決你正在嘗試解決的任何問題。 –
我所需要的只是圖表區域在屏幕上出現的座標,即您知道如何獲取該座標軸的灰色空間? – Someguy
在哪個座標系中? –