Android 座標點是否在橢圓裡面

 

    public  static  boolean point_in_oval(float x,float y,float center_x,float center_y,float r1,float r2){

        float a=(x-center_x);
        float b=(y-center_y);
        float c=r1*r1;
        float d=r2*r2;
        a=a*a;
        b=b*b;

       a/=c;
       b/=d;
      if(a+b<=1)return  true;


        return false;

    }