Neil Ireson created SOLR-8197:
---------------------------------
Summary: Make zero counts in heatmap PNG transparent
Key: SOLR-8197
URL: https://issues.apache.org/jira/browse/SOLR-8197
Project: Solr
Issue Type: Improvement
Affects Versions: 5.3
Reporter: Neil Ireson
Priority: Minor
It would be useful to have transparent zero values so that I can overlay the
image as a layer on a map.
The change just requires altering two methods in SpatialHeatmapFacets.java as
follows:
{code}
static void writeCountAtColumnRow(BufferedImage image, int rows, int c, int r,
int val)
{
image.setRGB(c, rows - 1 - r, val == 0 ? 0 : val ^ 0xFF_00_00_00);
}
static int getCountAtColumnRow(BufferedImage image, int rows, int c, int r)
{
int val = image.getRGB(c, rows - 1 - r);
return val == 0 ? 0 : val ^ 0xFF_00_00_00;
}
{code}
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