2.1.12.9 LoadMapTiles

1 Description
2 Syntax
3 Parameters
4 Return
5 Examples
6 Remark
7 See Also
8 Header to Included
9 Reference

Description

retrieve map image by given url

Syntax

LPVOID LoadMapTiles( LPCSTR lpcszUrl, double dMinLongitude, double dMaxLongitude, double dMinLatitude, double dMaxLatitude, unsigned int nZoomLevel, MapTilesOptions* lpOptions )

Parameters

lpcszUrl: [input] url such as https://abc.example.com/tiles/{x}/{y}/{z}, where {x}, {y}, and {z} are mandatory.

dMinLongitude: [input] minimum longitude

dMaxLongitude: [input] maximum longitude

dMinLatitude: [input] minimum latitude

dMaxLatitude: [input] maximum latitude

nZoomLevel: [input] zoom level

lpOptions: [input] MapTilesOptions, can be NULL

struct MapTilesOptions
{
	bool bIsWebMercator; //true to be Web Mercator
	bool bConvertToWGS84; //if true, convert to the World Geodetic System WGS84 standard
	unsigned int nTimeout; //timeout limit
	unsigned int nDelay; //delay time
	unsigned int nRetry; //number of retry
	unsigned int nParallel; //parallel threads
	const char* lpcszRequestHeader; //request header
};

Return

return pointer to image matrix for success, otherwise return NULL

Examples

EX1

#include <Origin.h>
#include <../OriginLab/opencv_origin.h>
#include <OImage.h>

void LoadMapTiles_ex()
{
	LPCSTR lpcszUrlPattern;//set URL here
	
	double west = 110;
	double east = 120;
	double north = 25; 
	double south = 17;
	unsigned int nZoomLevel = 6;
	CvMat* ptrMat = (CvMat*)LoadMapTiles(lpcszUrlPattern, west, east, south, north, nZoomLevel, NULL);

	if(ptrMat)
	{
		ocvMat mat;
		mat.SetFromMat(ptrMat, false);
		ImagePage gp;
		gp.Create();
		ImageLayer img;
		img = gp.Layers();
		img.SetMat(mat, true);
	}

	return;

}