From ed1604087f5e43b7599040fb41d270f3ee40fb0d Mon Sep 17 00:00:00 2001
From: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Date: Sat, 20 May 2023 14:46:58 +0200
Subject: [PATCH] profile: read DPR from QML page

This is needed on mobile, where some screens have a high DPR.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
---
 profile-widget/profileview.cpp | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/profile-widget/profileview.cpp b/profile-widget/profileview.cpp
index 9c4068e32..6a82ebb0a 100644
--- a/profile-widget/profileview.cpp
+++ b/profile-widget/profileview.cpp
@@ -23,8 +23,7 @@ ProfileView::ProfileView(QQuickItem *parent) : ChartView(parent, ProfileZValue::
 	zoomLevel(0),
 	zoomedPosition(0.0),
 	empty(true),
-	shouldCalculateMax(true),
-	profileScene(std::make_unique<ProfileScene>(1.0, false, false))
+	shouldCalculateMax(true)
 {
 	setBackgroundColor(Qt::black);
 	setFlag(ItemHasContents, true);
@@ -56,7 +55,8 @@ void ProfileView::clear()
 {
 	//clearPictures();
 	//disconnectTemporaryConnections();
-	profileScene->clear();
+	if (profileScene)
+		profileScene->clear();
 	//handles.clear();
 	//gases.clear();
 	empty = true;
@@ -73,6 +73,11 @@ void ProfileView::plotDive(const struct dive *dIn, int dcIn, int flags)
 		return;
 	}
 
+	// We can't create the scene in the constructor, because we can't get the DPR property there. Oh joy!
+	if (!profileScene) {
+		double dpr = std::clamp(property("dpr").toReal(), 1.0, 100.0);
+		profileScene = std::make_unique<ProfileScene>(dpr, false, false);
+	}
 	// If there was no previously displayed dive, turn off animations
 	if (empty)
 		flags |= RenderFlags::Instant;