Round very small values to zero in tick labels.

Sometimes, due to representation errors, we have an axis boundary that
should be zero but is actually negative and very small. In order to
avoid printing "-0" we round off these values to zero.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/renderer.cpp b/src/renderer.cpp
index 8c762e2..31e5c51 100644
--- a/src/renderer.cpp
+++ b/src/renderer.cpp
@@ -32,6 +32,12 @@ ValueToShortString(double value, int prec, const std::string& unit)
 
     prec++;
 
+    /* round very low values to zero */
+    /* theoretically this function should not be asked to print values as small as 1e-9 */
+    if (std::abs(value) < 1e-9) {
+        value = 0.0;
+    }
+
     std::stringstream ss;
     ss << std::fixed << std::setprecision(prec > 0 ? prec : 0) << value << PREFIXES[pidx] << unit;
     return ss.str();