求解

lylylyly

void Speed_Conversion2()
{
        float coefficient = 0;
        float vx=0,vy=0,vz = 0;
        coefficient = (float)(basic_speed*basic_speed)/(coordinate_X*coordinate_X+coordinate_Y*coordinate_Y);
        coefficient = (float)sqrt(coefficient);
       
        vx = coefficient*coordinate_X;//coefficient回归系数
        vy = coefficient*coordinate_Y;
        vz = 1;
        McNamm_wheel_control(vx,vy,vz);
}

coordinate_X怎么算