From b8e404b789c03b0f30358289b0509b16fe12eb63 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20T=C5=AFma?= <tumic@cbox.cz>
Date: Sun, 22 May 2016 15:47:23 +0200
Subject: [PATCH] Plots are now paper size agnostic

---
 src/gui.cpp       | 35 +++++++++++++++++++++--------------
 src/trackinfo.cpp |  7 ++++++-
 src/trackinfo.h   |  3 ++-
 3 files changed, 29 insertions(+), 16 deletions(-)

diff --git a/src/gui.cpp b/src/gui.cpp
index cef44c92..7492c199 100644
--- a/src/gui.cpp
+++ b/src/gui.cpp
@@ -7,6 +7,8 @@
 #include <QPrintDialog>
 #include <QPrinter>
 #include <QPainter>
+#include <QPaintEngine>
+#include <QPaintDevice>
 #include <QKeyEvent>
 #include <QSignalMapper>
 #include <QMenu>
@@ -34,10 +36,6 @@
 #include "gui.h"
 
 
-#define PLOT_INFO_HEIGHT 200
-#define PLOT_MARGIN 100
-#define PLOT_GRAPH_RATIO 0.2
-
 static QString timeSpan(qreal time)
 {
 	unsigned h, m, s;
@@ -709,27 +707,36 @@ void GUI::plot(QPrinter *printer)
 		info.insert(tr("Time"), timeSpan(_time));
 
 
+	qreal ratio = p.paintEngine()->paintDevice()->logicalDpiX() / SCREEN_DPI;
+	qreal ih = info.contentSize().height() * ratio;
+	qreal mh = ih / 2;
+
+#define GRR(printer) \
+	(((printer)->width() > (printer)->height()) \
+	  ? 0.15 * ((qreal)((printer)->width()) / (qreal)((printer)->height())) \
+	  : 0.15)
+#define TRR(printer) \
+	(1.0 - GRR(printer))
+
 	if (info.isEmpty()) {
 		if (_trackGraphs->isVisible())
 			_track->plot(&p, QRectF(0, 0, printer->width(),
-			  ((1.0 - PLOT_GRAPH_RATIO) * printer->height())));
+			  (TRR(printer) * printer->height())));
 		else
 			_track->plot(&p, QRectF(0, 0, printer->width(), printer->height()));
 	} else {
-		info.plot(&p, QRectF(0, 0, printer->width(), PLOT_INFO_HEIGHT));
+		info.plot(&p, QRectF(0, 0, printer->width(), ih));
 		if (_trackGraphs->isVisible())
-			_track->plot(&p, QRectF(0, PLOT_INFO_HEIGHT + PLOT_MARGIN,
-			  printer->width(), ((1.0 - PLOT_GRAPH_RATIO) * printer->height())
-			  - (PLOT_INFO_HEIGHT + 2*PLOT_MARGIN)));
+			_track->plot(&p, QRectF(0, ih + mh, printer->width(),
+			  (TRR(printer) * printer->height()) - (ih + 2*mh)));
 		else
-			_track->plot(&p, QRectF(0, PLOT_INFO_HEIGHT + PLOT_MARGIN,
-			  printer->width(), printer->height()
-			  - (PLOT_INFO_HEIGHT + PLOT_MARGIN)));
+			_track->plot(&p, QRectF(0, ih + mh, printer->width(),
+			  printer->height() - (ih + mh)));
 	}
 	if (_trackGraphs->isVisible()) {
 		GraphView *gv = static_cast<GraphView*>(_trackGraphs->currentWidget());
-		gv->plot(&p,  QRectF(0, (1.0 - PLOT_GRAPH_RATIO) * printer->height(),
-		  printer->width(), printer->height() * PLOT_GRAPH_RATIO));
+		gv->plot(&p,  QRectF(0, TRR(printer) * printer->height(),
+		  printer->width(), printer->height() * GRR(printer)));
 	}
 }
 
diff --git a/src/trackinfo.cpp b/src/trackinfo.cpp
index 4d1e676d..8dcf1dcf 100644
--- a/src/trackinfo.cpp
+++ b/src/trackinfo.cpp
@@ -29,7 +29,12 @@ void TrackInfo::plot(QPainter *painter, const QRectF &target)
 	render(painter, target, adj);
 }
 
-bool TrackInfo::isEmpty()
+bool TrackInfo::isEmpty() const
 {
 	return _info->isEmpty();
 }
+
+QSizeF TrackInfo::contentSize() const
+{
+	return sceneRect().size();
+}
diff --git a/src/trackinfo.h b/src/trackinfo.h
index 71bfd245..b27a6913 100644
--- a/src/trackinfo.h
+++ b/src/trackinfo.h
@@ -14,7 +14,8 @@ public:
 
 	void insert(const QString &key, const QString &value);
 	void plot(QPainter *painter, const QRectF &target);
-	bool isEmpty();
+	bool isEmpty() const;
+	QSizeF contentSize() const;
 
 private:
 	InfoItem *_info;