From e1756ba69dd626073e22fd0a4f4c5fda42c88829 Mon Sep 17 00:00:00 2001
From: Aleks Kissinger <aleks0@gmail.com>
Date: Fri, 3 Feb 2017 16:11:29 +0100
Subject: drawing grid

---
 tikzit/src/gui/tikzscene.cpp | 78 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 77 insertions(+), 1 deletion(-)

(limited to 'tikzit/src/gui/tikzscene.cpp')

diff --git a/tikzit/src/gui/tikzscene.cpp b/tikzit/src/gui/tikzscene.cpp
index 60939dd..11d5a72 100644
--- a/tikzit/src/gui/tikzscene.cpp
+++ b/tikzit/src/gui/tikzscene.cpp
@@ -1,6 +1,82 @@
 #include "tikzscene.h"
 
-TikzScene::TikzScene(QObject *parent) : QGraphicsScene(parent)
+#include <QPen>
+#include <QBrush>
+
+TikzScene::TikzScene(Graph *graph, QObject *parent) :
+    QGraphicsScene(parent), _graph(graph)
+{
+
+}
+
+Graph *TikzScene::graph() const
+{
+    return _graph;
+}
+
+void TikzScene::setGraph(Graph *graph)
+{
+    _graph = graph;
+    graphReplaced();
+}
+
+void TikzScene::graphReplaced()
 {
+    foreach (NodeItem *ni, nodeItems) {
+        removeItem(ni);
+        delete ni;
+    }
+    nodeItems.clear();
+
+    QPen blackPen(Qt::black);
+    QBrush redBrush(Qt::red);
+
+    foreach (Node *n, _graph->nodes()) {
+        NodeItem *ni = new NodeItem(n);
+        nodeItems << ni;
+        addItem(ni);
+    }
+}
+
+void TikzScene::drawBackground(QPainter *painter, const QRectF &rect)
+{
+    // draw the grid
+    int step = 10;
+
+    QPen pen;
+    pen.setWidth(2);
+    pen.setCosmetic(true);
+    pen.setColor(QColor(245,245,255));
+
+    painter->setPen(pen);
+    for (int x = step; x < rect.right(); x += step) {
+        if (x % (step * 8) != 0) {
+            painter->drawLine(x, rect.top(), x, rect.bottom());
+            painter->drawLine(-x, rect.top(), -x, rect.bottom());
+        }
+    }
+
+    for (int y = step; y < rect.bottom(); y += step) {
+        if (y % (step * 8) != 0) {
+            painter->drawLine(rect.left(), y, rect.right(), y);
+            painter->drawLine(rect.left(), -y, rect.right(), -y);
+        }
+    }
+
+    pen.setColor(QColor(240,240,245));
+    painter->setPen(pen);
+    for (int x = step*8; x < rect.right(); x += step*8) {
+        painter->drawLine(x, rect.top(), x, rect.bottom());
+        painter->drawLine(-x, rect.top(), -x, rect.bottom());
+    }
+
+    for (int y = step*8; y < rect.bottom(); y += step*8) {
+        painter->drawLine(rect.left(), y, rect.right(), y);
+        painter->drawLine(rect.left(), -y, rect.right(), -y);
+    }
 
+    pen.setColor(QColor(230,230,240));
+    painter->setPen(pen);
+    painter->drawLine(rect.left(), 0, rect.right(), 0);
+    painter->drawLine(0, rect.top(), 0, rect.bottom());
 }
-- 
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