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#ifndef LLMR_GEOMETRY_GEOMETRY
#define LLMR_GEOMETRY_GEOMETRY
#include <llmr/util/pbf.hpp>
#include <llmr/util/noncopyable.hpp>
#include <cstdlib>
namespace llmr {
class Geometry : private util::noncopyable {
public:
inline explicit Geometry(pbf& data);
enum command : uint8_t {
end = 0,
move_to = 1,
line_to = 2,
close = 7
};
inline command next(int32_t &rx, int32_t &ry);
private:
pbf& data;
uint8_t cmd;
uint32_t length;
int32_t x, y;
int32_t ox, oy;
};
Geometry::Geometry(pbf& data)
: data(data),
cmd(1),
length(0),
x(0), y(0),
ox(0), oy(0) {}
Geometry::command Geometry::next(int32_t &rx, int32_t &ry) {
if (data.data < data.end) {
if (length == 0) {
uint32_t cmd_length = static_cast<uint32_t>(data.varint());
cmd = cmd_length & 0x7;
length = cmd_length >> 3;
}
--length;
if (cmd == move_to || cmd == line_to) {
rx = (x += data.svarint());
ry = (y += data.svarint());
if (cmd == move_to) {
ox = x;
oy = y;
return move_to;
} else {
return line_to;
}
} else if (cmd == close) {
rx = ox;
ry = oy;
return close;
} else {
fprintf(stderr, "unknown command: %d\n", cmd);
// TODO: gracefully handle geometry parse failures
return end;
}
} else {
return end;
}
}
}
#endif
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