I am working on a Webapp using PrimeFaces. I am very close to a solution, but am stuck with trying to update the chart as new data is calculated. I have 3 tabs: Inputs, Outputs & Charts. On the Inputs Tab, I have textboxes and a Submit button. On the Outputs Tab, I have a datachart to display the data that is calculated after inputs are entered and submit is clicked. I have verified that data is populated correctly. On the Charts Tab, I have a chart (will be multiple later) that is to display data from the calculation as well.
Here is my relevant code:
public void createNewChart() {
FileInputStream fis = null;
try {
//Graphic Text
BufferedImage bufferedImg = new BufferedImage(100, 25, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = bufferedImg.createGraphics();
g2.drawString("This is a text", 0, 10);
ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(bufferedImg, "png", os);
graphicText = new DefaultStreamedContent(new ByteArrayInputStream(os.toByteArray()), "image/png");
//Chart
File chartFile = new File("C:\\Desktop\\Temp", "Chart" + Math.round(Math.random() * 1000000) + ".png");
chartData = calculateValuesServlet.getChartData();
calculateDataSets();
XYSeriesCollection xyDataset = new XYSeriesCollection();
xyDataset.addSeries(minumumLine);
xyDataset.addSeries(maximumLine);
xyDataset.addSeries(optimumLine);
xyDataset.addSeries(ratingPoint);
chart = ChartFactory.createXYLineChart("Chart Title", xAxis.getAxisLabel(), yAxis.getAxisLabel(), xyDataset, PlotOrientation.VERTICAL, true, false, false);
fixRenderings();
ChartUtilities.saveChartAsPNG(chartFile, chart, 375, 300);
fis = new FileInputStream(chartFile);
chartContent = new DefaultStreamedContent(fis, "image/png");
calculateValuesServlet.setNewChartNeeded(false);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (fis != null) {
fis.close();
}
} catch (IOException ex) {
Logger.getLogger(DataChart.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
Also, in my index.html:
<p:tab title="Charts">
<h:panelGrid columns="2" cellpadding="10">
<p:graphicImage id="outputChart1" value="#{dataChart.chartContent}" />
</h:panelGrid>
</p:tab>
And for completeness, this is from DataChart.java:
public StreamedContent getChartContent() {
if (chartData != null && !chartData.isEmpty() && calculateValuesServlet.isNewChartNeeded()) {
createNewChart();
}
return chartContent;
}
I have started saving the charts to Desktop\\Temp so that I can view the charts. The ones that are created in my Temp folder are correct, but the one that appears on the webapp is not. I also tried setting cache="FALSE" in the graphicImage, but then I get a broken image icon instead of the graph.
I realize this tells me that the webapp is not getting that latest image, but why?
I'm facing problem on image not refresh too.
Try to change the scope to @RequestScoped and add in cache="false" on p:graphicImage
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