任务
我想从头开始使用 JavaFX 创建甘特图。
示例
假设我有 2 台机器 Machine A 和 Machine B，它们有 2 个状态在线(绿色)和离线(红色)。我想在给定的时间间隔内用水平彩色条显示它们的状态，X 轴是日期轴，Y 轴是机器轴。
问题
我从哪里开始？我需要使用哪些类？如果有人有一个最小的例子并且可以分享它，那就太好了。
非常感谢你。
最佳答案
事实证明，BubbleChart 源代码是一个很好的例子。
基本上，您可以使用 XYChart 及其数据的修改版本。您需要做的是添加额外的数据，例如值的有效时间和着色样式。
剩下的是使用日期轴，因此使用日期值而不是数字值。
这是我想出来的，以防有人想玩弄它:
另一个例子:
来源:
甘特图.java:
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javafx.beans.NamedArg;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Node;
import javafx.scene.chart.Axis;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.ValueAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.layout.StackPane;
import javafx.scene.shape.Rectangle;
public class GanttChart<X,Y> extends XYChart<X,Y> {
public static class ExtraData {
public long length;
public String styleClass;
public ExtraData(long lengthMs, String styleClass) {
super();
this.length = lengthMs;
this.styleClass = styleClass;
}
public long getLength() {
return length;
}
public void setLength(long length) {
this.length = length;
}
public String getStyleClass() {
return styleClass;
}
public void setStyleClass(String styleClass) {
this.styleClass = styleClass;
}
}
private double blockHeight = 10;
public GanttChart(@NamedArg("xAxis") Axis<X> xAxis, @NamedArg("yAxis") Axis<Y> yAxis) {
this(xAxis, yAxis, FXCollections.<Series<X, Y>>observableArrayList());
}
public GanttChart(@NamedArg("xAxis") Axis<X> xAxis, @NamedArg("yAxis") Axis<Y> yAxis, @NamedArg("data") ObservableList<Series<X,Y>> data) {
super(xAxis, yAxis);
if (!(xAxis instanceof ValueAxis && yAxis instanceof CategoryAxis)) {
throw new IllegalArgumentException("Axis type incorrect, X and Y should both be NumberAxis");
}
setData(data);
}
private static String getStyleClass( Object obj) {
return ((ExtraData) obj).getStyleClass();
}
private static double getLength( Object obj) {
return ((ExtraData) obj).getLength();
}
@Override protected void layoutPlotChildren() {
for (int seriesIndex=0; seriesIndex < getData().size(); seriesIndex++) {
Series<X,Y> series = getData().get(seriesIndex);
Iterator<Data<X,Y>> iter = getDisplayedDataIterator(series);
while(iter.hasNext()) {
Data<X,Y> item = iter.next();
double x = getXAxis().getDisplayPosition(item.getXValue());
double y = getYAxis().getDisplayPosition(item.getYValue());
if (Double.isNaN(x) || Double.isNaN(y)) {
continue;
}
Node block = item.getNode();
Rectangle ellipse;
if (block != null) {
if (block instanceof StackPane) {
StackPane region = (StackPane)item.getNode();
if (region.getShape() == null) {
ellipse = new Rectangle( getLength( item.getExtraValue()), getBlockHeight());
} else if (region.getShape() instanceof Rectangle) {
ellipse = (Rectangle)region.getShape();
} else {
return;
}
ellipse.setWidth( getLength( item.getExtraValue()) * ((getXAxis() instanceof NumberAxis) ? Math.abs(((NumberAxis)getXAxis()).getScale()) : 1));
ellipse.setHeight(getBlockHeight() * ((getYAxis() instanceof NumberAxis) ? Math.abs(((NumberAxis)getYAxis()).getScale()) : 1));
y -= getBlockHeight() / 2.0;
// Note: workaround for RT-7689 - saw this in ProgressControlSkin
// The region doesn't update itself when the shape is mutated in place, so we
// null out and then restore the shape in order to force invalidation.
region.setShape(null);
region.setShape(ellipse);
region.setScaleShape(false);
region.setCenterShape(false);
region.setCacheShape(false);
block.setLayoutX(x);
block.setLayoutY(y);
}
}
}
}
}
public double getBlockHeight() {
return blockHeight;
}
public void setBlockHeight( double blockHeight) {
this.blockHeight = blockHeight;
}
@Override protected void dataItemAdded(Series<X,Y> series, int itemIndex, Data<X,Y> item) {
Node block = createContainer(series, getData().indexOf(series), item, itemIndex);
getPlotChildren().add(block);
}
@Override protected void dataItemRemoved(final Data<X,Y> item, final Series<X,Y> series) {
final Node block = item.getNode();
getPlotChildren().remove(block);
removeDataItemFromDisplay(series, item);
}
@Override protected void dataItemChanged(Data<X, Y> item) {
}
@Override protected void seriesAdded(Series<X,Y> series, int seriesIndex) {
for (int j=0; j<series.getData().size(); j++) {
Data<X,Y> item = series.getData().get(j);
Node container = createContainer(series, seriesIndex, item, j);
getPlotChildren().add(container);
}
}
@Override protected void seriesRemoved(final Series<X,Y> series) {
for (XYChart.Data<X,Y> d : series.getData()) {
final Node container = d.getNode();
getPlotChildren().remove(container);
}
removeSeriesFromDisplay(series);
}
private Node createContainer(Series<X, Y> series, int seriesIndex, final Data<X,Y> item, int itemIndex) {
Node container = item.getNode();
if (container == null) {
container = new StackPane();
item.setNode(container);
}
container.getStyleClass().add( getStyleClass( item.getExtraValue()));
return container;
}
@Override protected void updateAxisRange() {
final Axis<X> xa = getXAxis();
final Axis<Y> ya = getYAxis();
List<X> xData = null;
List<Y> yData = null;
if(xa.isAutoRanging()) xData = new ArrayList<X>();
if(ya.isAutoRanging()) yData = new ArrayList<Y>();
if(xData != null || yData != null) {
for(Series<X,Y> series : getData()) {
for(Data<X,Y> data: series.getData()) {
if(xData != null) {
xData.add(data.getXValue());
xData.add(xa.toRealValue(xa.toNumericValue(data.getXValue()) + getLength(data.getExtraValue())));
}
if(yData != null){
yData.add(data.getYValue());
}
}
}
if(xData != null) xa.invalidateRange(xData);
if(yData != null) ya.invalidateRange(yData);
}
}
}
GanttChartSample.java:
import java.util.Arrays;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.scene.Scene;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import chart.gantt_04.GanttChart.ExtraData;
// TODO: use date for x-axis
public class GanttChartSample extends Application {
@Override public void start(Stage stage) {
stage.setTitle("Gantt Chart Sample");
String[] machines = new String[] { "Machine 1", "Machine 2", "Machine 3" };
final NumberAxis xAxis = new NumberAxis();
final CategoryAxis yAxis = new CategoryAxis();
final GanttChart<Number,String> chart = new GanttChart<Number,String>(xAxis,yAxis);
xAxis.setLabel("");
xAxis.setTickLabelFill(Color.CHOCOLATE);
xAxis.setMinorTickCount(4);
yAxis.setLabel("");
yAxis.setTickLabelFill(Color.CHOCOLATE);
yAxis.setTickLabelGap(10);
yAxis.setCategories(FXCollections.<String>observableArrayList(Arrays.asList(machines)));
chart.setTitle("Machine Monitoring");
chart.setLegendVisible(false);
chart.setBlockHeight( 50);
String machine;
machine = machines[0];
XYChart.Series series1 = new XYChart.Series();
series1.getData().add(new XYChart.Data(0, machine, new ExtraData( 1, "status-red")));
series1.getData().add(new XYChart.Data(1, machine, new ExtraData( 1, "status-green")));
series1.getData().add(new XYChart.Data(2, machine, new ExtraData( 1, "status-red")));
series1.getData().add(new XYChart.Data(3, machine, new ExtraData( 1, "status-green")));
machine = machines[1];
XYChart.Series series2 = new XYChart.Series();
series2.getData().add(new XYChart.Data(0, machine, new ExtraData( 1, "status-green")));
series2.getData().add(new XYChart.Data(1, machine, new ExtraData( 1, "status-green")));
series2.getData().add(new XYChart.Data(2, machine, new ExtraData( 2, "status-red")));
machine = machines[2];
XYChart.Series series3 = new XYChart.Series();
series3.getData().add(new XYChart.Data(0, machine, new ExtraData( 1, "status-blue")));
series3.getData().add(new XYChart.Data(1, machine, new ExtraData( 2, "status-red")));
series3.getData().add(new XYChart.Data(3, machine, new ExtraData( 1, "status-green")));
chart.getData().addAll(series1, series2, series3);
chart.getStylesheets().add(getClass().getResource("ganttchart.css").toExternalForm());
Scene scene = new Scene(chart,620,350);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
甘特图.css
.status-red {
-fx-background-color:rgba(128,0,0,0.7);
}
.status-green {
-fx-background-color:rgba(0,128,0,0.7);
}
.status-blue {
-fx-background-color:rgba(0,0,128,0.7);
}
关于javafx - 从零开始的甘特图，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/27975898/