handline null in line series

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- Handling nulls in line series
+
 ## [0.3.0] - 2026-02-19
 
 ### Changed

examples/bitcoin.rs

@@ -3,7 +3,6 @@ use plotive::{data, des};
 mod common;
 
 fn main() {
-    // FIXME: support parsing datetime in CSV
     let btc_csv = common::example_res("BTC-USD.csv");
     let csv_data = std::fs::read_to_string(&btc_csv).unwrap();
     let data_source = data::csv::parse_str(&csv_data, Default::default()).unwrap();

src/data.rs

@@ -43,7 +43,11 @@ pub enum SampleRef<'a> {
 impl SampleRef<'_> {
     /// Check if the sample is null
     pub fn is_null(&self) -> bool {
-        matches!(self, SampleRef::Null)
+        match self {
+            SampleRef::Null => true,
+            SampleRef::Num(v) => !v.is_finite(),
+            _ => false,
+        }
     }
 
     /// Get the sample as a numeric value, if possible
@@ -200,7 +204,11 @@ pub enum Sample {
 impl Sample {
     /// Check if the sample is null
     pub fn is_null(&self) -> bool {
-        matches!(self, Sample::Null)
+        match self {
+            Sample::Null => true,
+            Sample::Num(v) => !v.is_finite(),
+            _ => false,
+        }
     }
 
     /// Get the sample as a numeric value, if possible