From 0002340da590611f635775d0555c66c7f22db09c Mon Sep 17 00:00:00 2001
From: Aleks Kissinger <aleks0@gmail.com>
Date: Thu, 10 Jan 2019 18:12:48 +0100
Subject: infinite canvas (closes #20)

---
 src/gui/tikzscene.cpp    | 26 +++++++++++++++++++++++++-
 src/gui/tikzscene.h      |  1 +
 src/gui/tikzview.cpp     |  2 +-
 src/gui/undocommands.cpp |  6 ++----
 4 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/src/gui/tikzscene.cpp b/src/gui/tikzscene.cpp
index 31d5bf6..7b090d8 100644
--- a/src/gui/tikzscene.cpp
+++ b/src/gui/tikzscene.cpp
@@ -41,7 +41,8 @@ TikzScene::TikzScene(TikzDocument *tikzDocument, ToolPalette *tools,
     _rubberBandItem = new QGraphicsRectItem();
     _enabled = true;
     //setSceneRect(-310,-230,620,450);
-    setSceneRect(-1000,-1000,2000,2000);
+    //setSceneRect(-2000,-1500,4000,3000);
+    refreshSceneBounds();
 
     QPen pen;
     pen.setColor(QColor::fromRgbF(0.5, 0.0, 0.5));
@@ -106,6 +107,7 @@ void TikzScene::graphReplaced()
     }
 
     refreshZIndices();
+    refreshSceneBounds();
 }
 
 void TikzScene::extendSelectionUp()
@@ -870,6 +872,28 @@ void TikzScene::reloadStyles()
     }
 }
 
+void TikzScene::refreshSceneBounds() {
+    qreal maxX = 30.0, maxY = 30.0;
+    qreal increment = 20.0;
+
+    foreach (Node *n, graph()->nodes()) {
+        while (n->point().x() - increment < -maxX || n->point().x() + increment > maxX) {
+            maxX += increment;
+        }
+
+        while (n->point().y() - increment < -maxY || n->point().y() + increment > maxY) {
+            maxY += increment;
+        }
+    }
+
+    QRectF rect(-GLOBAL_SCALEF * maxX, -GLOBAL_SCALEF * maxY, 2.0 * GLOBAL_SCALEF * maxX, 2.0 * GLOBAL_SCALEF * maxY);
+
+    if (rect != sceneRect()) {
+        setSceneRect(rect);
+        invalidate();
+    }
+}
+
 // void TikzScene::refreshSceneBounds()
 // {
 // //    if (!views().empty()) {
diff --git a/src/gui/tikzscene.h b/src/gui/tikzscene.h
index e8ea2c6..cc0a4a7 100644
--- a/src/gui/tikzscene.h
+++ b/src/gui/tikzscene.h
@@ -80,6 +80,7 @@ public:
 
 	void getSelection(QSet<Node*> &selNodes, QSet<Edge*> &selEdges);
 	QSet<Node*> getSelectedNodes();
+    void refreshSceneBounds();
 
 public slots:
     void graphReplaced();
diff --git a/src/gui/tikzview.cpp b/src/gui/tikzview.cpp
index 5b0f09c..ddbc404 100644
--- a/src/gui/tikzview.cpp
+++ b/src/gui/tikzview.cpp
@@ -49,7 +49,7 @@ void TikzView::zoomOut()
 void TikzView::setScene(QGraphicsScene *scene)
 {
     QGraphicsView::setScene(scene);
-    centerOn(QPointF(0.0f,0.0f));
+    centerOn(QPointF(0.0,0.0));
 }
 
 void TikzView::drawBackground(QPainter *painter, const QRectF &rect)
diff --git a/src/gui/undocommands.cpp b/src/gui/undocommands.cpp
index 8a00536..82b9455 100644
--- a/src/gui/undocommands.cpp
+++ b/src/gui/undocommands.cpp
@@ -29,16 +29,14 @@ GraphUpdateCommand::GraphUpdateCommand(TikzScene *scene, QUndoCommand *parent) :
 void GraphUpdateCommand::undo()
 {
     _scene->tikzDocument()->refreshTikz();
-    //refreshSceneBounds does nothing
-    //_scene->refreshSceneBounds();
+    _scene->refreshSceneBounds();
     _scene->invalidate();
 }
 
 void GraphUpdateCommand::redo()
 {
     _scene->tikzDocument()->refreshTikz();
-    //refreshSceneBounds does nothing
-    //_scene->refreshSceneBounds();
+    _scene->refreshSceneBounds();
     _scene->invalidate();
 }
 
-- 
cgit v1.2.3