Manage Chart Data Markers in Presentations Using PHP

Overview

This article explains how to work with chart data markers in Aspose.Slides. It shows how to create a chart, access a series and its data points, apply picture fills to markers at the data-point level, adjust marker size, and save the updated presentation. It also notes that standard marker shapes are available through the MarkerStyleType enumeration and that marker appearance is preserved when exporting charts to raster formats or SVG.

Set Chart Marker Options

The markers can be set on chart data points inside particular series. In order to set chart marker options. Please follow the steps below:

• Instantiate Presentation class.
• Creating the default chart.
• Set the picture.
• Take first chart series.
• Add new data point.
• Write presentation to disk.

In the example given below, we have set the chart marker options on data points level.

  # Creating empty presentation
  $pres = new Presentation();
  try {
    # Access first slide
    $slide = $pres->getSlides()->get_Item(0);
    # Creating the default chart
    $chart = $slide->getShapes()->addChart(ChartType::LineWithMarkers, 0, 0, 400, 400);
    # Getting the default chart data WorkSheet index
    $defaultWorksheetIndex = 0;
    # Getting the chart data WorkSheet
    $fact = $chart->getChartData()->getChartDataWorkbook();
    # Delete demo series
    $chart->getChartData()->getSeries()->clear();
    # Add new series
    $chart->getChartData()->getSeries()->add($fact->getCell($defaultWorksheetIndex, 1, 1, "Series 1"), $chart->getType());
    # Load the picture 1
    $imgx1 = $pres->getImages()->addImage(new Java("java.io.FileInputStream", new Java("java.io.File", "Desert.jpg")));
    # Load the picture 2
    $imgx2 = $pres->getImages()->addImage(new Java("java.io.FileInputStream", new Java("java.io.File", "Tulips.jpg")));
    # Take first chart series
    $series = $chart->getChartData()->getSeries()->get_Item(0);
    # Add new point (1:3) there.
    $point = $series->getDataPoints()->addDataPointForLineSeries($fact->getCell($defaultWorksheetIndex, 1, 1, 4.5));
    $point->getMarker()->getFormat()->getFill()->setFillType(FillType::Picture);
    $point->getMarker()->getFormat()->getFill()->getPictureFillFormat()->getPicture()->setImage($imgx1);
    $point = $series->getDataPoints()->addDataPointForLineSeries($fact->getCell($defaultWorksheetIndex, 2, 1, 2.5));
    $point->getMarker()->getFormat()->getFill()->setFillType(FillType::Picture);
    $point->getMarker()->getFormat()->getFill()->getPictureFillFormat()->getPicture()->setImage($imgx2);
    $point = $series->getDataPoints()->addDataPointForLineSeries($fact->getCell($defaultWorksheetIndex, 3, 1, 3.5));
    $point->getMarker()->getFormat()->getFill()->setFillType(FillType::Picture);
    $point->getMarker()->getFormat()->getFill()->getPictureFillFormat()->getPicture()->setImage($imgx1);
    $point = $series->getDataPoints()->addDataPointForLineSeries($fact->getCell($defaultWorksheetIndex, 4, 1, 4.5));
    $point->getMarker()->getFormat()->getFill()->setFillType(FillType::Picture);
    $point->getMarker()->getFormat()->getFill()->getPictureFillFormat()->getPicture()->setImage($imgx2);
    # Changing the chart series marker
    $series->getMarker()->setSize(15);
    # Save presentation with chart
    $pres->save("ScatterChart.pptx", SaveFormat::Pptx);
  } catch (JavaException $e) {
  } finally {
    if (!java_is_null($pres)) {
      $pres->dispose();
    }
  }

FAQ

Which marker shapes are available out of the box?

Standard shapes are available (circle, square, diamond, triangle, etc.); the list is defined by the MarkerStyleType class. If you need a non-standard shape, use a marker with a picture fill to emulate custom visuals.

Are markers preserved when exporting a chart to an image or SVG?

Yes. When rendering charts to raster formats or saving shapes as SVG, markers retain their appearance and settings, including size, fill, and outline.