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4
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1
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2 // written in the D programming language
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3
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4 module chipmunkd.cpBB;
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5
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15
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6 import chipmunkd.cpVect;
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7 import chipmunkd.chipmunk_types;
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4
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8
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9 struct cpBB{
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10 cpFloat l, b, r ,t;
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11 }
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12
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13 static cpBB
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14 cpBBNew(const cpFloat l, const cpFloat b,
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15 const cpFloat r, const cpFloat t)
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16 {
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17 cpBB bb = {l, b, r, t};
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18 return bb;
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19 }
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20
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21 static cpBool
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22 cpBBintersects(const cpBB a, const cpBB b)
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23 {
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24 return (a.l<=b.r && b.l<=a.r && a.b<=b.t && b.b<=a.t);
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25 }
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26
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27 static cpBool
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28 cpBBcontainsBB(const cpBB bb, const cpBB other)
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29 {
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30 return (bb.l < other.l && bb.r > other.r && bb.b < other.b && bb.t > other.t);
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31 }
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32
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33 static cpBool
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34 cpBBcontainsVect(const cpBB bb, const cpVect v)
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35 {
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36 return (bb.l < v.x && bb.r > v.x && bb.b < v.y && bb.t > v.y);
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37 }
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38
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39 static cpBB
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40 cpBBmerge(const cpBB a, const cpBB b){
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41 return cpBBNew(
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42 cpfmin(a.l, b.l),
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43 cpfmin(a.b, b.b),
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44 cpfmax(a.r, b.r),
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45 cpfmax(a.t, b.t)
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46 );
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47 }
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48
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49 static cpBB
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50 cpBBexpand(const cpBB bb, const cpVect v){
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51 return cpBBNew(
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52 cpfmin(bb.l, v.x),
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53 cpfmin(bb.b, v.y),
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54 cpfmax(bb.r, v.x),
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55 cpfmax(bb.t, v.y)
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56 );
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57 }
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58
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59 cpVect
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60 cpBBClampVect(const cpBB bb, const cpVect v)
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61 {
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62 cpFloat x = cpfmin(cpfmax(bb.l, v.x), bb.r);
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63 cpFloat y = cpfmin(cpfmax(bb.b, v.y), bb.t);
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64 return cpv(x, y);
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65 }
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66
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67 cpVect
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68 cpBBWrapVect(const cpBB bb, const cpVect v)
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69 {
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70 cpFloat ix = cpfabs(bb.r - bb.l);
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71 cpFloat modx = cpfmod(v.x - bb.l, ix);
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72 cpFloat x = (modx > 0.0f) ? modx : modx + ix;
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73
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74 cpFloat iy = cpfabs(bb.t - bb.b);
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75 cpFloat mody = cpfmod(v.y - bb.b, iy);
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76 cpFloat y = (mody > 0.0f) ? mody : mody + iy;
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77
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78 return cpv(x + bb.l, y + bb.b);
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79 }
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