43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
#include <stdexcept>
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#include <gdal/gdal.h>
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#include "gdal/gdal_priv.h"
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#include <gdal/gdal_frmts.h>
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#include "HeightMap.hh"
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HeightMap::HeightMap(const char* filepath)
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{
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// Open the file with gdal:
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const GDALAccess eAccess = GA_ReadOnly;
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GDALDatasetUniquePtr file;
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GDALRegister_GTiff();
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file = GDALDatasetUniquePtr(GDALDataset::FromHandle(GDALOpen( filepath, eAccess )));
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if( !file )
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{
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throw std::runtime_error("Could not open tif file!");
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}
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// The heigthmap only has one band
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auto band = file->GetBands()[0];
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// write the attrributes
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this->width = band->GetXSize();
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this->height = band->GetYSize();
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this->min = band->GetMinimum();
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this->max = band-> GetMaximum();
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this->data = (float *) CPLMalloc(sizeof(float)*width*height);
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CPLErr error = band->RasterIO( GF_Read, 0, 0, width, height,
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this->data, width, height, GDT_Float32,
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0, 0 );
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if (error) { throw std::runtime_error("Could not read tif file!"); }
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band->FlushCache();
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}
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float HeightMap::get_pixel(int x, int y)
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{
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// all the pixels are in an array of floats from left to right, top to bottom
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int offset = ((this->width * y) + x);
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return *(this->data + offset);
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}
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