1 files changed, 64 insertions, 1 deletions
diff --git a/tikzit/src/gui/tikzview.cpp b/tikzit/src/gui/tikzview.cpp
index d2a769c..a83c9ec 100644
--- a/tikzit/src/gui/tikzview.cpp
+++ b/tikzit/src/gui/tikzview.cpp
@@ -1,20 +1,83 @@
 #include "tikzview.h"
+#include "tikzit.h"
 
 #include <QDebug>
 
 TikzView::TikzView(QWidget *parent) : QGraphicsView(parent)
 {
     setRenderHint(QPainter::Antialiasing);
-    qDebug() << "TikzView()";
+    setDragMode(QGraphicsView::RubberBandDrag);
+    _scale = 1.0f;
 }
 
 void TikzView::zoomIn()
 {
+    _scale *= 1.6f;
     scale(1.6,1.6);
 }
 
 void TikzView::zoomOut()
 {
+    _scale *= 0.625f;
     scale(0.625,0.625);
 }
 
+void TikzView::drawBackground(QPainter *painter, const QRectF &rect)
+{
+    // draw the grid
+    int step = GLOBAL_SCALE / 8;
+
+    QPen pen1;
+    pen1.setWidth(1);
+    pen1.setCosmetic(true);
+    pen1.setColor(QColor(230,230,230));
+
+    QPen pen2 = pen1;
+    pen2.setColor(QColor(200,200,200));
+
+    QPen pen3 = pen1;
+    pen3.setColor(QColor(160,160,160));
+
+    painter->setPen(pen1);
+
+    if (_scale > 0.2f) {
+        for (int x = -step; x > rect.left(); x -= step) {
+            if (x % (step * 8) != 0) painter->drawLine(x, rect.top(), x, rect.bottom());
+        }
+
+        for (int x = step; x < rect.right(); x += step) {
+            if (x % (step * 8) != 0) painter->drawLine(x, rect.top(), x, rect.bottom());
+        }
+
+        for (int y = -step; y > rect.top(); y -= step) {
+            if (y % (step * 8) != 0) painter->drawLine(rect.left(), y, rect.right(), y);
+        }
+
+        for (int y = step; y < rect.bottom(); y += step) {
+            if (y % (step * 8) != 0) painter->drawLine(rect.left(), y, rect.right(), y);
+        }
+    }
+
+    painter->setPen(pen2);
+
+    for (int x = -step*8; x > rect.left(); x -= step*8) {
+        painter->drawLine(x, rect.top(), x, rect.bottom());
+    }
+
+    for (int x = step*8; x < rect.right(); x += step*8) {
+        painter->drawLine(x, rect.top(), x, rect.bottom());
+    }
+
+    for (int y = -step*8; y > rect.top(); y -= step*8) {
+        painter->drawLine(rect.left(), y, rect.right(), y);
+    }
+
+    for (int y = step*8; y < rect.bottom(); y += step*8) {
+        painter->drawLine(rect.left(), y, rect.right(), y);
+    }
+
+    painter->setPen(pen3);
+    painter->drawLine(rect.left(), 0, rect.right(), 0);
+    painter->drawLine(0, rect.top(), 0, rect.bottom());
+}
+