www.pudn.com > roam.rar > RoamTerrain.cpp

// RoamTerrain.cpp: implementation of the CRoamTerrain class. 
// 
////////////////////////////////////////////////////////////////////// 
 
#include "stdafx.h" 
#include "ROAM.h" 
#include "RoamTerrain.h" 
#include "fstream.h" 
#include "math.h" 
#include "landscape.h" 
 
#ifdef _DEBUG 
#undef THIS_FILE 
static char THIS_FILE[]=__FILE__; 
#define new DEBUG_NEW 
#endif 
 
double *gHeightMaster; 
extern void SetMinMaxElevation(float zmin,float zmax); 
 
////////////////////////////////////////////////////////////////////// 
// Construction/Destruction 
////////////////////////////////////////////////////////////////////// 
 
CRoamTerrain::CRoamTerrain() 
{ 
	LoadTerrainData(); 
  //  loadTerrain(1024, &heightMap); 
	gLand.Init(heightMap); 
} 
 
CRoamTerrain::~CRoamTerrain() 
{ 
	if(heightMap) 
		free(heightMap); 
} 
///////////////////////////////////////////// 
//////   读入grid格式高程数据 /////////////// 
///////////////////////////////////////////// 
BOOL CRoamTerrain::LoadTerrainData() 
{ 
	char szValue[409600]; 
	float zmin; 
	float zmax; 
	int i = 0; 
	int j = 0; 
	BOOL status = FALSE; 
	 
	ifstream is("test.grd");  //读入grid文件 
	is.getline(szValue,sizeof(szValue));//读入dsaa 
 
	is.getline(szValue,sizeof(szValue));//读入row&col 
	char seps[] = " "; 
	char *token; 
	token = strtok(szValue, seps ); 
	row = atoi(szValue); 
	token = strtok(NULL, seps ); 
	col = atoi(token); 
 
	is.getline(szValue,sizeof(szValue));//读入xmin.xmax 
	is.getline(szValue,sizeof(szValue));//读入ymin.ymax 
	is.getline(szValue,sizeof(szValue));//读入zmin.zmax 
	token = strtok(szValue, seps ); 
	zmin =  (float)atof(token); 
	token = strtok(NULL, seps); 
	zmax = (float)atof(token); 
	SetMinMaxElevation(zmin,zmax); 
	heightMap = (double*)malloc(row*col*sizeof(double)); 
	 
	i=0; 
	while(is.eof()==false) 
	{ 
		is.getline(szValue,sizeof(szValue));////读入高程数据 
		token = strtok(szValue, seps ); 
		while(token!=NULL) 
		{ 
			heightMap[i] = (double)atof(token); 
			token = strtok(NULL,seps); 
			i++; 
		} 
	} 
 
	is.close(); 
	status = TRUE; 
	return status; 
} 
 
void CRoamTerrain::RoamDrawScene(int viewPosX,int viewPosY) 
{ 
	// Perform all the functions needed to render one frame. 
	gLand.Reset(viewPosX,viewPosY); 
	gLand.Tessellate(); 
	gLand.Render(); 
}