@Override
public Graph2DResult readValue() {
VType vType = tableData.readValue();
xColumnName.readNext();
yColumnName.readNext();
tooltipColumnName.readNext();
// Table and columns must be available
if (vType == null || xColumnName.isMissing() || yColumnName.isMissing()) {
return null;
}
// Prepare new dataset
Point2DDataset dataset;
if (vType instanceof VNumberArray) {
dataset = Point2DDatasets.lineData(((VNumberArray) vType).getData());
} else {
dataset =
DatasetConversions.point2DDatasetFromVTable(
(VTable) vType, xColumnName.getValue(), yColumnName.getValue());
}
// Process all renderer updates
List<LineGraph2DRendererUpdate> updates = rendererUpdateQueue.readValue();
for (LineGraph2DRendererUpdate rendererUpdate : updates) {
renderer.update(rendererUpdate);
}
// If no size is set, don't calculate anything
if (renderer.getImageHeight() == 0 && renderer.getImageWidth() == 0) return null;
BufferedImage image =
new BufferedImage(
renderer.getImageWidth(), renderer.getImageHeight(), BufferedImage.TYPE_3BYTE_BGR);
renderer.draw(image.createGraphics(), dataset);
previousImage = ValueUtil.toVImage(image);
return new Graph2DResult(
vType,
previousImage,
new GraphDataRange(
renderer.getXPlotRange(), dataset.getXStatistics(), renderer.getXAggregatedRange()),
new GraphDataRange(
renderer.getYPlotRange(), dataset.getYStatistics(), renderer.getYAggregatedRange()),
renderer.getFocusValueIndex());
}
