Examples with XYStyler org.knowm.xchart.style.XYStyler used on opensource projects

Example 1 with XYStyler

use of org.knowm.xchart.style.XYStyler in project openhab-core by openhab.

the class DefaultChartProvider method createChart.

@Override
public BufferedImage createChart(@Nullable String serviceId, @Nullable String theme, ZonedDateTime startTime, ZonedDateTime endTime, int height, int width, @Nullable String items, @Nullable String groups, @Nullable Integer dpiValue, @Nullable String yAxisDecimalPattern, @Nullable Boolean legend) throws ItemNotFoundException, IllegalArgumentException {
    logger.debug("Rendering chart: service: '{}', theme: '{}', startTime: '{}', endTime: '{}', width: '{}', height: '{}', items: '{}', groups: '{}', dpi: '{}', yAxisDecimalPattern: '{}', legend: '{}'", serviceId, theme, startTime, endTime, width, height, items, groups, dpiValue, yAxisDecimalPattern, legend);
    // If a persistence service is specified, find the provider, or use the default provider
    PersistenceService service = (serviceId == null) ? persistenceServiceRegistry.getDefault() : persistenceServiceRegistry.get(serviceId);
    // Did we find a service?
    QueryablePersistenceService persistenceService = (service instanceof QueryablePersistenceService) ? (QueryablePersistenceService) service : (QueryablePersistenceService) // 
    persistenceServiceRegistry.getAll().stream().filter(// 
    it -> it instanceof QueryablePersistenceService).findFirst().orElseThrow(() -> new IllegalArgumentException("No Persistence service found."));
    int seriesCounter = 0;
    // get theme
    ChartTheme chartTheme = theme == null ? CHART_THEME_DEFAULT : CHART_THEMES.getOrDefault(theme, CHART_THEME_DEFAULT);
    // get DPI
    int dpi = dpiValue != null && dpiValue > 0 ? dpiValue : DPI_DEFAULT;
    // Create Chart
    XYChart chart = new XYChartBuilder().width(width).height(height).build();
    // Define the time axis - the defaults are not very nice
    Duration period = Duration.between(startTime, endTime);
    String pattern;
    if (period.compareTo(TEN_MINUTES) <= 0) {
        pattern = "mm:ss";
    } else if (period.compareTo(ONE_DAY) <= 0) {
        pattern = "HH:mm";
    } else if (period.compareTo(ONE_WEEK) <= 0) {
        pattern = "EEE d";
    } else {
        pattern = "d MMM";
    }
    XYStyler styler = chart.getStyler();
    styler.setDatePattern(pattern);
    // axis
    styler.setAxisTickLabelsFont(chartTheme.getAxisTickLabelsFont(dpi));
    styler.setAxisTickLabelsColor(chartTheme.getAxisTickLabelsColor());
    styler.setXAxisMin((double) startTime.toInstant().toEpochMilli());
    styler.setXAxisMax((double) endTime.toInstant().toEpochMilli());
    int yAxisSpacing = Math.max(height / 10, chartTheme.getAxisTickLabelsFont(dpi).getSize());
    if (yAxisDecimalPattern != null) {
        styler.setYAxisDecimalPattern(yAxisDecimalPattern);
    }
    styler.setYAxisTickMarkSpacingHint(yAxisSpacing);
    styler.setYAxisLabelAlignment(Styler.TextAlignment.Right);
    // chart
    styler.setChartBackgroundColor(chartTheme.getChartBackgroundColor());
    styler.setChartFontColor(chartTheme.getChartFontColor());
    styler.setChartPadding(chartTheme.getChartPadding(dpi));
    styler.setPlotBackgroundColor(chartTheme.getPlotBackgroundColor());
    float plotGridLinesDash = (float) chartTheme.getPlotGridLinesDash(dpi);
    float[] plotGridLinesDashArray = { plotGridLinesDash, plotGridLinesDash };
    styler.setPlotGridLinesStroke(new BasicStroke((float) chartTheme.getPlotGridLinesWidth(dpi), BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 10, plotGridLinesDashArray, 0));
    styler.setPlotGridLinesColor(chartTheme.getPlotGridLinesColor());
    // legend
    styler.setLegendBackgroundColor(chartTheme.getLegendBackgroundColor());
    styler.setLegendFont(chartTheme.getLegendFont(dpi));
    styler.setLegendSeriesLineLength(chartTheme.getLegendSeriesLineLength(dpi));
    LegendPositionDecider legendPositionDecider = new LegendPositionDecider();
    // Loop through all the items
    if (items != null) {
        String[] itemNames = items.split(",");
        for (String itemName : itemNames) {
            Item item = itemUIRegistry.getItem(itemName);
            if (addItem(chart, persistenceService, startTime, endTime, item, seriesCounter, chartTheme, dpi, legendPositionDecider)) {
                seriesCounter++;
            }
        }
    }
    // Loop through all the groups and add each item from each group
    if (groups != null) {
        String[] groupNames = groups.split(",");
        for (String groupName : groupNames) {
            Item item = itemUIRegistry.getItem(groupName);
            if (item instanceof GroupItem) {
                GroupItem groupItem = (GroupItem) item;
                for (Item member : groupItem.getMembers()) {
                    if (addItem(chart, persistenceService, startTime, endTime, member, seriesCounter, chartTheme, dpi, legendPositionDecider)) {
                        seriesCounter++;
                    }
                }
            } else {
                throw new ItemNotFoundException("Item '" + item.getName() + "' defined in groups is not a group.");
            }
        }
    }
    Boolean showLegend = null;
    // If there are no series, render a blank chart
    if (seriesCounter == 0) {
        // always hide the legend
        showLegend = false;
        List<Date> xData = new ArrayList<>();
        List<Number> yData = new ArrayList<>();
        xData.add(Date.from(startTime.toInstant()));
        yData.add(0);
        xData.add(Date.from(endTime.toInstant()));
        yData.add(0);
        XYSeries series = chart.addSeries("NONE", xData, yData);
        series.setMarker(new None());
        series.setLineStyle(new BasicStroke(0f));
    }
    // if the legend is not already hidden, check if legend parameter is supplied, or calculate a sensible value
    if (showLegend == null) {
        if (legend == null) {
            // more than one series, show the legend. otherwise hide it.
            showLegend = seriesCounter > 1;
        } else {
            // take value from supplied legend parameter
            showLegend = legend;
        }
    }
    // This won't be perfect, but it's a good compromise
    if (showLegend) {
        styler.setLegendPosition(legendPositionDecider.getLegendPosition());
    } else {
        // hide the whole legend
        styler.setLegendVisible(false);
    }
    // Write the chart as a PNG image
    BufferedImage lBufferedImage = new BufferedImage(chart.getWidth(), chart.getHeight(), BufferedImage.TYPE_INT_ARGB);
    Graphics2D lGraphics2D = lBufferedImage.createGraphics();
    chart.paint(lGraphics2D, chart.getWidth(), chart.getHeight());
    return lBufferedImage;
}