Revision 1048
rangefinders are in fact working now
world.c  

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xint = p3.x+ua*(p4.xp3.x); 
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yint = p3.y+ua*(p4.yp3.y); 
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dist = sqrt((xintp1.x)*(xintp1.x)+(yintp1.y)*(yintp1.y)); 
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//printf("Got: %g\n", dist); 

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return dist; 
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} 
...  ...  
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double collide_world(ray_t *ray) 
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{ 
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double min = RAY_MISS; 
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int i, x; 

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double x; 

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int i; 

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for (i = 0; i < world.cur_objs; i++) { 
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x = collide(ray, &world.objs[i]); 
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min = (x < min) ? x : min; 
...  ...  
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*/ 
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/* These need to be measured... */ 
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double rf_thetas[5] = {0.0, 2*M_PI/5, 4*M_PI/5, 6*M_PI/5, 8*M_PI/5}; 
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//double rf_thetas[5] = {0.0, 0.0, M_PI/2, M_PI, 3*M_PI/2}; 

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void update_rangefinders(Robot *bot) 
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{ 
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RangeFinder r = bot>shared>ranges; 
...  ...  
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/* Motion code has +y going down, I don't. 
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* So to compensate, just reflect theta up to first quadrant.*/ 
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double theta = bot>pose.theta; 
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theta = 2*M_PI  theta; 

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//ray_t rf = {0,0,0}; 

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int ir; 
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double x; 
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for (ir = 0; ir < 5; ir++) 
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{ 
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rf.d = rf_thetas[ir]; 

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rf.d = theta + rf_thetas[ir];


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x = collide_world(&rf); 
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//printf("[%d] = %g\n", ir, x);


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printf("@(%g)  [%d] = %g > %d\n",rf.d, ir, x, (short)x);


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bot>shared>ranges.d[ir] = x; 
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} 
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} 
...  ...  
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fclose(fin); 
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return 0; 
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} 
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