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const unsigned int pgm_sinus[91] PROGMEM = {0,17,35,52,70,87,105,122,139,156,174,191,208,225,242,259,276,292,309,326,342,358,375,391,407,423,438,454,469,485,500,515,530,545,559,574,588,602,616,629,643,656,669,682,695,707,719,731,743,755,766,777,788,799,809,819,829,839,848,857,866,875,883,891,899,906,914,921,927,934,940,946,951,956,961,966,970,974,978,982,985,988,990,993,995,996,998,999,999,1000,1000};
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const unsigned int pgm_sinus[91] PROGMEM = {0,17,35,52,70,87,105,122,139,156,174,191,208,225,242,259,276,292,309,326,342,358,375,391,407,423,438,454,469,485,500,515,530,545,559,574,588,602,616,629,643,656,669,682,695,707,719,731,743,755,766,777,788,799,809,819,829,839,848,857,866,875,883,891,899,906,914,921,927,934,940,946,951,956,961,966,970,974,978,982,985,988,990,993,995,996,998,999,999,1000,1000};
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//-----------------------------------------------
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//-----------------------------------------------
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// Fast arctan2
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// Fast arctan2 with max error of .01 rads
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// http://www.dspguru.com/comp.dsp/tricks/alg/fxdatan2.htm
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// http://www.dspguru.com/comp.dsp/tricks/alg/fxdatan2.htm
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//-----------------------------------------------
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//-----------------------------------------------
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   {
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   {
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      y = abs(y);
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      y = abs(y);
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      m = -1;                   // neg. für Quadrant III + IV
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      m = -1;                   // neg. für Quadrant III + IV
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   }
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   }
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   else m = 1;
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   else m = 1;
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   if (x>=0)
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   if (x>=0)
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   {
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   {
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      r = (x - y) / (x + y);
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      r = (x - y) / (x + y);