From 329f2d05e5eddb4f3f1208ce033dce6b57d4ab49 Mon Sep 17 00:00:00 2001
From: Niko Korkala <niko.korkala@qt.io>
Date: Tue, 17 Jun 2025 14:50:27 +0300
Subject: [PATCH] Make opacity work in LineSeries and SplineSeries
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Pick-to: 6.8
Fixes: QTBUG-137718
Change-Id: I15fe45c88faa596adb0f13faa91d36c24509ecd6
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>
Reviewed-by: Kaj Grönholm <kaj.gronholm@qt.io>
(cherry picked from commit cc2154707be026c7380bb6e67bd9e62e62ba1d5c)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 2bf74826919e13a4a4ab1c7198765bbdeb4a065d)
---
 src/graphs2d/qsgrenderer/pointrenderer.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/graphs2d/qsgrenderer/pointrenderer.cpp b/src/graphs2d/qsgrenderer/pointrenderer.cpp
index 8bf5cb2e..75f34edc 100644
--- a/src/graphs2d/qsgrenderer/pointrenderer.cpp
+++ b/src/graphs2d/qsgrenderer/pointrenderer.cpp
@@ -127,13 +127,16 @@ PointRenderer::SeriesStyle PointRenderer::getSeriesStyle(PointGroup *group)
 
     qsizetype index = group->colorIndex % seriesColors.size();
     QColor color = group->series->color().alpha() != 0 ? group->series->color() : seriesColors.at(index);
+    color.setAlpha(color.alpha() * group->series->opacity());
 
     QColor selectedColor = group->series->selectedColor().alpha() != 0
                                ? group->series->selectedColor()
                                : m_graph->theme()->singleHighlightColor();
+    selectedColor.setAlpha(selectedColor.alpha() * group->series->opacity());
 
     index = group->colorIndex % borderColors.size();
     QColor borderColor = borderColors.at(index);
+    borderColor.setAlpha(borderColor.alpha() * group->series->opacity());
     qreal borderWidth = theme->borderWidth();
 
     return {