From e2e0b33c6a7b55c4b0f7a268dd37e545feefc5a2 Mon Sep 17 00:00:00 2001
From: Tuukka Lehtonen <tuukka.lehtonen@semantum.fi>
Date: Tue, 21 Aug 2018 18:54:52 +0300
Subject: [PATCH 1/1] Render last known value in time series chart hairline
 value tip

Previously if a history item's data stream did not (yet) contain a value
with a timestamp >= than the chart hairline time, the value time on top
of the chart would not paint any value at all for that item. The best
thing the chart can do in such circumstances to prevent unwanted visual
skipping in the UI is to paint the last known sample's value regardless
of its endTime value.

gitlab #85

Change-Id: I362a19b8699c8c4a96240ddfc3fd68a91d6bbd06
---
 .../src/org/simantics/trend/impl/Plot.java           | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/bundles/org.simantics.trend/src/org/simantics/trend/impl/Plot.java b/bundles/org.simantics.trend/src/org/simantics/trend/impl/Plot.java
index bbeb3e695..d014d6556 100644
--- a/bundles/org.simantics.trend/src/org/simantics/trend/impl/Plot.java
+++ b/bundles/org.simantics.trend/src/org/simantics/trend/impl/Plot.java
@@ -475,8 +475,16 @@ public class Plot extends TrendGraphicalNode {
 				}
 				
 				if ( vb.getSample()!=null ) {
-					
-					if (isLast && vb.hasEndTime() && vb.getEndTimeDouble()<time) continue nextItem;
+
+					// gitlab #54: this can cause the value tip to not render values at all
+					// for items that have not been flushed at the point in time when this drawing
+					// is done. These circumstances are always temporary and later refreshes will
+					// remedy the situation. Having this logic can cause item values to randomly
+					// not be shown which is actually even more confusing to the user than rendering
+					// the latest flushed sample value.
+					// 
+					// For this reason, the if below has been commented out.
+					//if (isLast && vb.hasEndTime() && vb.getEndTimeDouble()<time) continue nextItem;
 										
 					if ( !vb.isNanSample() && !vb.isNullValue() ) {
 						Binding b = vb.getValueBinding();
-- 
2.43.2