From 709efed7bb1d5e028e6b6b0a1e82f7fbae297329 Mon Sep 17 00:00:00 2001
From: Sam Moore <matches@ucc.asn.au>
Date: Wed, 16 Apr 2014 02:34:15 +0800
Subject: [PATCH] Add grid lines

It seemed like a good idea at the time.
---
 src/view.cpp | 32 ++++++++++++++++++++++++++++++++
 src/view.h   |  1 +
 2 files changed, 33 insertions(+)

diff --git a/src/view.cpp b/src/view.cpp
index ce7489d..2b6641a 100644
--- a/src/view.cpp
+++ b/src/view.cpp
@@ -35,6 +35,31 @@ void View::ScaleAroundPoint(Real x, Real y, Real scaleAmt)
 	m_bounds.h *= scaleAmt;
 }
 
+void View::DrawGrid()
+{
+	// Draw some grid lines at fixed pixel positions
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+	glOrtho(0.0, 1.0, 1.0, 0.0, -1.f, 1.f);
+	glMatrixMode(GL_MODELVIEW);
+	glLoadIdentity();
+
+	glColor4f(0.9,0.9,0.9,0.1);
+	const float num_lines = 50.0;
+	for (float i = 0; i < num_lines; ++i)
+	{
+		glBegin(GL_LINES);
+		glVertex2f(i*(1.0/num_lines), 0.0);
+		glVertex2f(i*(1.0/num_lines), 1.0);
+		glEnd();
+		glBegin(GL_LINES);
+		glVertex2f(0.0,i*(1.0/num_lines));
+		glVertex2f(1.0,i*(1.0/num_lines));
+		glEnd();
+	
+	}
+}
+
 void View::Render()
 {
 	static bool debug_output_done = false;
@@ -47,12 +72,17 @@ void View::Render()
 	glClearColor(1.f,1.f,1.f,1.f);
 	glClear(GL_COLOR_BUFFER_BIT);
 
+	DrawGrid(); // Draw the gridlines
+
 	glMatrixMode(GL_PROJECTION);
 	glLoadIdentity();
 	glOrtho(Float(m_bounds.x), Float(m_bounds.x)+Float(m_bounds.w), Float(m_bounds.y) + Float(m_bounds.h), Float(m_bounds.y), -1.f, 1.f);
 	glMatrixMode(GL_MODELVIEW);
 	glLoadIdentity();
 
+
+
+
 	glColor4f(0.f,0.f,0.f,1.f);
 	glBegin(GL_QUADS);
 	for (unsigned id = 0; id < m_document.ObjectCount(); ++id)
@@ -67,6 +97,7 @@ void View::Render()
 	}
 	glEnd();
 
+	
 	for (unsigned id = 0; id < m_document.ObjectCount(); ++id)
 	{
 		if (m_document.m_objects.types[id] == RECT_OUTLINE)
@@ -79,4 +110,5 @@ void View::Render()
 		glVertex2f(Float(obj_bounds.x), Float(obj_bounds.y) + Float(obj_bounds.h));
 		glEnd();
 	}
+
 }
diff --git a/src/view.h b/src/view.h
index 6b63799..4e2306a 100644
--- a/src/view.h
+++ b/src/view.h
@@ -18,6 +18,7 @@ namespace IPDF
 			void ScaleAroundPoint(Real x, Real y, Real scaleAmt);
 		
 		private:
+			void DrawGrid();
 			Document & m_document;
 			Rect m_bounds;
 	};
-- 
2.20.1