打開目標標題的方向

Question

在關閉它之前，這實際上與編程有關。

我正在使用一個程序來模擬2D地圖上的飛機。爲了達到目標方位，我很難找到轉向。

double maxHeadingChange = 10; //Maximum heading change per 100 ms 
double targetHeading = 0; 
     double differenceHeading = Math.Abs(targetHeading - heading); 
     //if we need to turn clockwise 

     if (targetHeading > 340 || targetHeading < 30) 
     { 
      if (heading < 180) 
      { 
       if (differenceHeading > maxHeadingChange) 
        heading -= maxHeadingChange; 
       else 
       { 
        heading -= differenceHeading; 
       } 
      } 
      else 
      { 
       if (differenceHeading > maxHeadingChange) 
        heading -= maxHeadingChange; 
       else 
       { 
        heading -= differenceHeading; 
       } 
      } 
     } 
     else if (targetHeading > heading) 
     { 
      if (targetHeading - heading < maxHeadingChange) 
       heading = targetHeading; 
      else 
      { 
       heading += maxHeadingChange; 
      } 
     } 
     else 
     { 
      if (heading - targetHeading < maxHeadingChange) 
       heading = targetHeading; 
      else 
      { 
       heading -= maxHeadingChange; 
      } 
     } 
     //MessageBox.Show(headingDifference + ""); 
     //just for now 
     //heading = targetHeading; 

     if(heading > 359) 
     { 
      heading = 0; 
     }if(heading < 0) 
     { 
      heading += 360; 
     } 

你可以看到什麼，我試圖做的就是方向轉動，然後如果轉向量超過最大轉動量更大時，最大轉動量轉動。

問題是，當對象處於〜10度的標題並且目標是例如354度時，它看到它應該順時針轉動以擊中該目標，因爲那將會減去要擊打的標題一個較小的目標標題。問題是，一旦目標航向經過0並轉到較高的航向範圍，它就會將轉向逆轉爲順時針方向。這導致物體轉向它的朝向（逆時針旋轉或以度數遞減），並且在它通過0時突然反向旋轉方向。

我需要找到一個更有效的方法來獲得轉彎以度爲單位的數量（我不能簡單地將標題設置爲targetHeading，因爲在最大轉動量中有一些模擬），以便它檢測到從當前的10 *標題開始朝向350 *的標題，繼續減去標題。

對不起，很長的解釋。

潛在的解決方案1 ​​[編輯]

double maxHeadingChange = 10; //Maximum heading change per 100 ms 
double targetHeading = 0; 
double differenceHeading = Math.Abs(targetHeading - heading); 
     //if we need to turn clockwise 
     if(getTurnDir(heading, targetHeading)) 
     { 
      //Turn right 
      if(differenceHeading > maxHeadingChange) 
      { 
       heading -= maxHeadingChange; 
      }else 
      { 
       heading -= differenceHeading; 
      } 
     }else 
     { 
      if (differenceHeading > maxHeadingChange) 
      { 
       heading += maxHeadingChange; 
      } 
      else 
      { 
       heading += differenceHeading; 
      } 
     } 

     //MessageBox.Show(headingDifference + ""); 
     //just for now 
     //heading = targetHeading; 

     if(heading > 359) 
     { 
      heading = 0; 
     } 
     if(heading < 0) 
     { 
      heading += 360; 
     } 
    } 

    double hdgDiff(double h1, double h2) 
    { // angle between two headings 
     double diff = h1 - h2 + 3600 % 360; 
     return diff <= 180 ? diff : 360 - diff; 
    } 
    /// <summary> 
    /// Left is false 
    /// </summary> 
    /// <param name="hdg"></param> 
    /// <param name="newHdg"></param> 
    /// <returns></returns> 
    bool getTurnDir(double hdg, double newHdg) 
    { // should a new heading turn left or right? 
     if (newHdg > hdg) 
      return newHdg - hdg > 180; 
     return hdg - newHdg > 180; 
    } 

〜基督教

Answer 1

double hdgDiff (double h1, double h2) { // angle between two headings 
    const double diff = fmod(h1 - h2 + 3600, 360); 
    return diff <= 180 ? diff : 360 - diff; 
} 

bool isTurnCCW(double hdg, double newHdg) { // should a new heading turn left ie. CCW? 
    const double diff = newHdg - hdg;  // CCW = counter-clockwise ie. left 
    return diff > 0 ? diff > 180 : diff >= -180; 
}