From fa65d01b8b0b3163e34ab42350ebbce239a2b0e6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Steffen=20F=C3=BCndgens?= <Steffen-1710@web.de>
Date: Tue, 4 Nov 2014 19:40:35 +0100
Subject: [PATCH] implemented reading the heightmap from png

---
 terrain.cc | 29 ++++++++++++++++++++++++++++-
 terrain.hh |  4 ++++
 2 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/terrain.cc b/terrain.cc
index 9b11ed1..313d96c 100644
--- a/terrain.cc
+++ b/terrain.cc
@@ -1,7 +1,34 @@
 #include "terrain.hh"
 
-Terrain::Terrain() {
+Terrain::Terrain(){
 }
 
 Terrain::~Terrain() {
 }
+
+
+void Terrain::load() {
+    std::ifstream terrain_png(this->filePath);
+    unsigned int width, height, rowNum, columnNum;
+
+    terrain_png.seekg(16);			//skip part of the header
+    terrain_png.read((char *)&width, 4);	//read width
+    terrain_png.read((char *)&height, 4);	//read height
+    width = ntohl(width);			//convert from host to network byte order
+    height = ntohl(height);			
+
+    heightmap = new unsigned int*[height];	//initialize the heightmap
+    for(rowNum=0; rowNum<height; rowNum++){	//read in the heightmap
+	heightmap[rowNum] = new unsigned int[width];
+	for(columnNum=0; columnNum<width; columnNum++){
+	    terrain_png.read((char *)&heightmap[rowNum][columnNum], 1);
+	}
+    }
+
+
+
+    
+}
+
+void Terrain::render() {
+}
diff --git a/terrain.hh b/terrain.hh
index 1eee694..07a85be 100644
--- a/terrain.hh
+++ b/terrain.hh
@@ -3,6 +3,9 @@
 
 #include <string>
 #include "texture.hh"
+#include <fstream>
+//#include <winsock.h>		//on Windows
+#include <netinet/in.h>		//on Unix
 
 class Terrain {
     public:
@@ -14,6 +17,7 @@ class Terrain {
         float friction;
         Texture texture;
         std::string filePath;
+	unsigned int** heightmap;	//can be accessed like 'unsigned int[][]'
 };
 
 #endif