3 files changed, 52 insertions, 3 deletions
diff --git a/src/View/TopView.cpp b/src/View/TopView.cpp
index 38d4824..684f4ef 100644
--- a/src/View/TopView.cpp
+++ b/src/View/TopView.cpp
@@ -21,11 +21,51 @@
 #include <Data/Level.h>
 #include <Data/Room.h>
 #include <Data/Triangle.h>
+#include <Gui/RenderArea.h>
 #include <GL/gl.h>
+#include <cmath>
 
 namespace ZoomEdit {
 namespace View {
 
+void TopView::drawGrid(Gui::RenderArea *renderArea) {
+  float depth = std::log10(renderArea->getScale())-0.75f;
+  float depth2 = std::floor(depth);
+  float step = std::pow(0.1f, depth2);
+  float x1, x2;
+  float y1, y2;
+  float width = renderArea->getViewWidth();
+  float height = renderArea->getViewHeight();
+  
+  x1 = x2 = renderArea->getXCenter();
+  y1 = y2 = renderArea->getYCenter();
+  x1 -= width/2; x2 += width/2;
+  y1 -= height/2; y2 += height/2;
+  
+  glLineWidth(1.0f);
+  
+  glBegin(GL_LINES);
+  
+  for(int i = 0; 0.4f*(depth-depth2+i-1) < 0.5f; i++) {
+    float f = std::min(0.4f*(depth-depth2+i), 0.5f);
+    glColor3f(f, f, f);
+    
+    for(f = x1 - std::fmod(x1, step); f <= x2; f+=step) {
+      glVertex2f(f, y1);
+      glVertex2f(f, y2);
+    }
+    
+    for(f = y1 - std::fmod(y1, step); f <= y2; f+=step) {
+      glVertex2f(x1, f);
+      glVertex2f(x2, f);
+    }
+    
+    step *= 10;
+  }
+  
+  glEnd();
+}
+
 void TopView::renderRoom(Data::Room *room) {
   const std::list<Data::Triangle*> &floor = room->getFloorTriangles();
   
@@ -43,7 +83,9 @@ void TopView::renderRoom(Data::Room *room) {
   glEnd();
 }
 
-void TopView::render() {
+void TopView::render(Gui::RenderArea *renderArea) {
+  drawGrid(renderArea);
+  
   if(!level)
     return;
   
diff --git a/src/View/TopView.h b/src/View/TopView.h
index 5141e51..844faa5 100644
--- a/src/View/TopView.h
+++ b/src/View/TopView.h
@@ -35,6 +35,8 @@ class TopView : public View {
   private:
     Data::Level *level;
     
+    void drawGrid(Gui::RenderArea *renderArea);
+    
     void renderRoom(Data::Room *room);
     
   public:
@@ -43,7 +45,7 @@ class TopView : public View {
     Data::Level* getLevel() {return level;}
     void setLevel(Data::Level *level0) {level = level0;}
     
-    virtual void render();
+    virtual void render(Gui::RenderArea *renderArea);
 };
 
 }
diff --git a/src/View/View.h b/src/View/View.h
index 32c201e..cdf27aa 100644
--- a/src/View/View.h
+++ b/src/View/View.h
@@ -21,13 +21,18 @@
 #define ZOOMEDIT_VIEW_H_
 
 namespace ZoomEdit {
+
+namespace Gui {
+class RenderArea;
+}
+
 namespace View {
 
 class View {
   public:
     virtual ~View() {}
     
-    virtual void render() = 0;
+    virtual void render(Gui::RenderArea *renderArea) = 0;
 };
 
 }