| 0,0 → 1,126 |
|---|
| /* |
| This program (files math.c and math.h) is free software; you can redistribute it and/or modify |
| it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; |
| either version 3 of the License, or (at your option) any later version. |
| This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; |
| without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License and GNU Lesser General Public License for more details. |
| You should have received a copy of GNU General Public License (License_GPL.txt) and |
| GNU Lesser General Public License (License_LGPL.txt) along with this program. |
| If not, see <http://www.gnu.org/licenses/>. |
| |
| Please note: All the other files for the project "Mikrokopter" by H.Buss are under the license (license_buss.txt) published by www.mikrokopter.de |
| */ |
| /*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| Peter Muehlenbrock |
| Winkelfunktionen sin, cos und arctan in |
| brute-force Art: Sehr Schnell, nicht sonderlich genau, aber ausreichend |
| get_dist Funktion fuer Entfernungsermittlung |
| Stand 12.10.2007 |
| ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| */ |
| #include "main.h" |
| |
| |
| // arctan Funktion: Eingabewert x,y Rueckgabe =arctan(x,y) in grad |
| int arctan_i( signed int x, signed int y) |
| { |
| short int change_xy = 0; |
| signed int i; |
| long signed int wert; |
| int return_value; |
| |
| if ((abs(x)) > (abs(y))) // x,y Werte vertauschen damit arctan <45 grad bleibt |
| { |
| change_xy = 1; |
| i = x; |
| x = y; |
| y = i; |
| } |
| |
| // Quadranten ermitteln |
| |
| // Wert durch lineare Interpolation ermitteln |
| if ((y == 0) && (x == 0)) wert =1; // Division durch 0 nicht erlaubt |
| else wert= abs(((long)x*1000)/((long)y)); |
| |
| if (wert <=268) //0...0.0,268 entsprechend 0..15 Grad |
| { |
| return_value = (signed int)((wert*100)/(268-0)*(15-0)/100) +0; |
| } |
| else if (wert <=578) //0,268...0.0,568 entsprechend 15..30 Grad |
| { |
| return_value = (signed int)((((wert-268)*100)/(578-268)*(30-15))/100) +15; |
| } |
| else //0,568...1 entsprechend 30..45 Grad |
| { |
| return_value = (signed int)((((wert-578)*50)/(1000-578)*(45-30))/50) +30; |
| } |
| |
| if (change_xy == 0) return_value = 90-return_value; //Quadrant 45..90 Grad |
| if ((x >= 0) && (y <0)) return_value = - return_value; |
| else if ((x < 0) && (y >= 0)) return_value = - return_value; |
| |
| return return_value; |
| } |
| |
| |
| // cosinus Funktion: Eingabewert Winkel in Grad, Rueckgabe =cos(winkel)*1000 |
| signed int cos_i(signed int winkel) |
| { |
| winkel = sin_i(90-winkel); |
| return winkel; |
| } |
| |
| |
| 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}; |
| //von Nick666, Stand 28.9.2007 |
| // sinus Funktion: Eingabewert Winkel in Grad, Rueckgabe =sin(winkel)*1000 |
| signed int sin_i(signed int winkel) |
| { |
| short int m,n; |
| |
| if (abs(winkel) >=360) winkel = winkel % 360; |
| if (winkel < 0) |
| { |
| m = -1; |
| winkel = abs(winkel); |
| } |
| else m = +1; |
| n =1; |
| |
| // Quadranten auswerten |
| if ((winkel > 90 ) && (winkel <= 180)) winkel = 180 - winkel; |
| else if ((winkel > 180 ) && (winkel <= 270)) |
| { |
| winkel = winkel -180; |
| n = -1; |
| } |
| else if ((winkel > 270) && (winkel <= 360)) |
| { |
| winkel = 360 - winkel; |
| n = -1; |
| } |
| // else //0 - 90 Grad |
| |
| winkel = pgm_read_word(&pgm_sinus[winkel]); |
| return (winkel*m*n); |
| } |
| |
| // Aus x,y und Winkel Distanz ermitteln |
| long get_dist(signed int x, signed int y, signed int phi) |
| { |
| long dist; |
| if (abs(x) > abs(y) ) |
| { |
| dist = (long) x; //Groesseren Wert wegen besserer Genauigkeit nehmen |
| dist = abs((dist *1000) / (long) sin_i(phi)); |
| } |
| else |
| { |
| dist = (long) y; |
| dist = abs((dist *1000) / (long) cos_i(phi)); |
| } |
| return dist; |
| } |
| |