mpri-graphics-project/util/ObjParser.cpp

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#include "ObjParser.hpp"
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#include <sstream>
#include <cctype>
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ObjParser::ObjParser(const std::string& path)
: path(path)
{}
Mesh ObjParser::parse() {
std::ifstream handle(path);
Mesh output;
if(!handle.is_open())
throw std::runtime_error(std::string("Cannot open the file ") + path);
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for(std::string line; std::getline(handle, line); ) {
std::istringstream lineStream(strip(line));
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char type;
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lineStream >> type;
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if(type == 'v') { // vertice
double x, y, z;
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lineStream >> x >> y >> z;
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output.add_vertice(Point(x, y, z));
}
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else if(type == 'f') {
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int v1, v2, v3;
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lineStream >> v1 >> v2 >> v3;
output.add_face(Face(v1 - 1, v2 - 1, v3 - 1));
}
else {
throw BadObj(path);
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}
}
return output;
}
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std::string ObjParser::strip(const std::string& str) {
size_t fPos, lPos;
for(fPos=0; fPos < str.size(); ++fPos) {
if(!isspace(str[fPos]))
break;
}
if(fPos == str.size())
return "";
for(lPos=str.size() - 1; lPos > 0; --lPos) {
if(!isspace(str[lPos]))
break;
}
return str.substr(fPos, lPos - fPos + 1);
}