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1 // Dir.cpp
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2
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3 #include "lib.h"
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4 #include "Dir.h"
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5
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6 using namespace std;
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7
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8 namespace Dir
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9 {
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10 t back(t current)
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11 {
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12 static t result[] = {south, southwest, west, northwest,
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13 north, northeast, east, southeast};
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14 check(current, "Dir::back()");
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15 return result[current];
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16 }
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17
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18 t left(t current)
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19 {
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20 static t result[] = {northwest, north, northeast, east,
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21 southeast, south, southwest, west};
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22 check(current, "Dir::left()");
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23 return result[current];
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24 }
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25
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26 t right(t current)
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27 {
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28 static t result[] = {northeast, east, southeast, south,
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29 southwest, west, northwest, north};
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30 check(current, "Dir::right()");
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31 return result[current];
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32 }
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33
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34 string dirToString(t current)
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35 {
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36 static string result[] = {"north", "northeast", "east", "southeast",
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37 "south", "southwest", "west", "northwest"};
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38 if (current >= min && current <= max)
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39 {
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40 return result[current];
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41 }
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42 else
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43 {
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44 return intToString(current);
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45 }
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46 }
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47
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48 Vec dirToVec(t current)
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49 {
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50 static Vec result[] = {Vec(0, -1), Vec(1, -1), Vec(1, 0), Vec(1, 1),
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51 Vec(0, 1), Vec(-1, 1), Vec(-1, 0), Vec(-1, -1)};
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52 check(current, "Dir::dirToVec()");
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53 return result[current];
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54 }
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55
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56 void check(t current, string const & name)
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57 {
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58 if (current < min || current > max)
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59 {
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60 throw InternalException(name + ": Invalid Direction: "
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61 + dirToString(current));
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62 }
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63 }
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64 }
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