crosshairdemo2.java

在软件开发中用来绘制各种图表的源码

        /**
         * Creates the demo chart.
         * 
         * @return The chart.
         */
        private JFreeChart createChart() {
            
            JFreeChart chart = ChartFactory.createTimeSeriesChart(
                "Crosshair Demo 2", 
                "Time of Day", 
                "Value",
                null, 
                true, 
                true, 
                false
            );

            XYDataset[] datasets = new XYDataset[SERIES_COUNT];
            for (int i = 0; i < SERIES_COUNT; i++) {
                datasets[i] = createDataset(
                    i, "Series " + i, 100.0 + i * 200.0, new Minute(), 200
                );
                if (i == 0) {
                    chart.getXYPlot().setDataset(datasets[i]);
                }
                else {
                    XYPlot plot = chart.getXYPlot();
                    plot.setDataset(i, datasets[i]);
                    plot.setRangeAxis(i, new NumberAxis("Axis " + (i + 1)));
                    plot.mapDatasetToRangeAxis(i, i);
                    plot.setRenderer(i, new XYLineAndShapeRenderer(true, false));
                }
            }
            chart.addChangeListener(this);
            chart.addProgressListener(this);
            chart.setBackgroundPaint(Color.white);
            XYPlot plot = chart.getXYPlot();
            plot.setOrientation(PlotOrientation.VERTICAL);
            plot.setBackgroundPaint(Color.lightGray);
            plot.setDomainGridlinePaint(Color.white);
            plot.setRangeGridlinePaint(Color.white);
            plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0));
            
            plot.setDomainCrosshairVisible(true);
            plot.setDomainCrosshairLockedOnData(false);
            plot.setRangeCrosshairVisible(false);

            XYItemRenderer renderer = plot.getRenderer();
            renderer.setPaint(Color.black);
                           
            return chart;
        }
        
//		/**
//		 * Handles a state change event.
//		 * 
//		 * @param event the event.
//		 */
//		public void stateChanged(ChangeEvent event) {
//			int value = this.slider.getValue();
//			XYPlot plot = this.chart.getXYPlot();
//			ValueAxis domainAxis = plot.getDomainAxis();
//			Range range = domainAxis.getRange();
//			double c = domainAxis.getLowerBound() + (value / 100.0) * range.getLength();
//			plot.setDomainCrosshairValue(c);
//		}
//
		/**
		 * Handles a chart progress event.
		 * 
		 * @param event
		 *            the event.
		 */
		public void chartProgress(ChartProgressEvent event) {
			if (event.getType() != ChartProgressEvent.DRAWING_FINISHED) {
				return;
			}
			if (this.chartPanel != null) {
				JFreeChart c = this.chartPanel.getChart();
				if (c != null) {
					XYPlot plot = c.getXYPlot();
					XYDataset dataset = plot.getDataset();
					Comparable seriesKey = dataset.getSeriesKey(0);
					double xx = plot.getDomainCrosshairValue();

					// update the table...
					this.model.setValueAt(seriesKey, 0, 0);
					long millis = (long) xx;
					this.model.setValueAt(new Long(millis), 0, 1);
                    for (int i = 0; i < SERIES_COUNT; i++) {
					    int itemIndex = this.series[i].getIndex(new Minute(new Date(millis)));
					    if (itemIndex >= 0) {
						    TimeSeriesDataItem item = this.series[i].getDataItem(Math.min(199, Math.max(0, itemIndex)));
						    TimeSeriesDataItem prevItem = this.series[i].getDataItem(Math.max(0, itemIndex - 1));
						    TimeSeriesDataItem nextItem = this.series[i].getDataItem(Math.min(199, itemIndex + 1));
						    long x = item.getPeriod().getMiddleMillisecond();
						    double y = item.getValue().doubleValue();
						    long prevX = prevItem.getPeriod().getMiddleMillisecond();
						    double prevY = prevItem.getValue().doubleValue();
						    long nextX = nextItem.getPeriod().getMiddleMillisecond();
						    double nextY = nextItem.getValue().doubleValue();
						    this.model.setValueAt(new Long(x), i, 1);
						    this.model.setValueAt(new Double(y), i, 2);
					    	this.model.setValueAt(new Long(prevX), i, 3);
						    this.model.setValueAt(new Double(prevY), i, 4);
						    this.model.setValueAt(new Long(nextX), i, 5);
						    this.model.setValueAt(new Double(nextY), i, 6);
                        }
					}

				}
			}
		}

	}

    /**
     * A demonstration application showing how to...
     *
     * @param title  the frame title.
     */
    public CrosshairDemo2(String title) {
        super(title);
        setContentPane(new DemoPanel());
    }

    /**
     * Creates a panel for the demo (used by SuperDemo.java).
     * 
     * @return A panel.
     */
    public static JPanel createDemoPanel() {
        return new DemoPanel();
    }
    
    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {
        CrosshairDemo2 demo = new CrosshairDemo2("Crosshair Demo 2");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
    }

    /**
     * A demo table model.
     */
    static class DemoTableModel extends AbstractTableModel implements TableModel {
    
        private Object[][] data;
        
        /**
         * Creates a new table model
         * 
         * @param rows  the row count.
         */
        public DemoTableModel(int rows) {
            this.data = new Object[rows][7];
        }
     
        /**
         * Returns the column count.
         * 
         * @return 7.
         */
        public int getColumnCount() {
            return 7;
        }
        
        /**
         * Returns the row count.
         * 
         * @return The row count.
         */
        public int getRowCount() {
            return this.data.length;
        }
        
        /**
         * Returns the value at the specified cell in the table.
         * 
         * @param row  the row index.
         * @param column  the column index.
         * 
         * @return The value.
         */
        public Object getValueAt(int row, int column) {
            return this.data[row][column];
        }
        
        /**
         * Sets the value at the specified cell.
         * 
         * @param value  the value.
         * @param row  the row index.
         * @param column  the column index.
         */
        public void setValueAt(Object value, int row, int column) {
            this.data[row][column] = value;
            fireTableDataChanged();
        }
        
        /**
         * Returns the column name.
         * 
         * @param column  the column index.
         * 
         * @return The column name.
         */
        public String getColumnName(int column) {
            switch(column) {
                case 0 : return "Series Name:";
                case 1 : return "X:";
                case 2 : return "Y:";
                case 3 : return "X (prev)";
                case 4 : return "Y (prev):";
                case 5 : return "X (next):";
                case 6 : return "Y (next):";
            }
            return null;
        }
        
    }
}