触摸屏校正问题

wawjx123

触摸屏校正发上来的6个系数如图。X轴offset和y轴offset的值好大，请大神求教

wawjx123

FunctionalState Get_touch_point(Coordinate * displayPtr,
                                Coordinate * screenPtr,
                                Parameter * para )
{
  FunctionalState retTHRESHOLD =ENABLE ;

  if(screenPtr==0)
  {
    /*èç1û»ñè¡μÄ′￥μãDÅÏ￠óDÎó￡¬Ôò·μ»ØDISABLE*/
    retTHRESHOLD = DISABLE;                       
  }
  else
  {   
    if( para->Divider != 0 )  /* ÿ′ζ¼òaD￡Õyê± */
    //if( para->Divider != 1 )    /* D￡ÕyÏμêyD′μ½FLASHê± */
    {        
      //displayPtr->x = ( (aa1 * screenPtr->x) + (bb1 * screenPtr->y) + cc1);        
      //displayPtr->y = ((aa2 * screenPtr->x) + (bb2 * screenPtr->y) + cc2 );
      displayPtr->x = ( (cal_p[0] * screenPtr->x) + (cal_p[1] * screenPtr->y) + cal_p[2]);        
      displayPtr->y = ((cal_p[3] * screenPtr->x) + (cal_p[4] * screenPtr->y) + cal_p[5] );
    }
    else
    {
      retTHRESHOLD = DISABLE;
    }
  }
  return(retTHRESHOLD);
}

wawjx123

FunctionalState Cal_touch_para( Coordinate * displayPtr,
                                Coordinate * screenPtr,
                                Parameter * para)
{
   
    FunctionalState retTHRESHOLD = ENABLE ;

    /* K￡½(X0￡-X2) (Y1￡-Y2)￡-(X1￡-X2) (Y0￡-Y2) */
    para->Divider = ((screenPtr[0].x - screenPtr[2].x) * (screenPtr[1].y - screenPtr[2].y)) -
                    ((screenPtr[1].x - screenPtr[2].x) * (screenPtr[0].y - screenPtr[2].y)) ;
   
                if( para->Divider == 0 )
    {
        retTHRESHOLD = DISABLE;
    }
    else
    {
        /* A￡½((XD0￡-XD2) (Y1￡-Y2)￡-(XD1￡-XD2) (Y0￡-Y2))￡ˉK        */
        para->An = ((displayPtr[0].x - displayPtr[2].x) * (screenPtr[1].y - screenPtr[2].y)) -
                   ((displayPtr[1].x - displayPtr[2].x) * (screenPtr[0].y - screenPtr[2].y));
        
        /* B￡½((X0￡-X2) (XD1￡-XD2)￡-(XD0￡-XD2) (X1￡-X2))￡ˉK        */
        para->Bn = ((screenPtr[0].x - screenPtr[2].x) * (displayPtr[1].x - displayPtr[2].x)) -
                   ((displayPtr[0].x - displayPtr[2].x) * (screenPtr[1].x - screenPtr[2].x));
        
        /* C￡½(Y0(X2XD1￡-X1XD2)+Y1(X0XD2￡-X2XD0)+Y2(X1XD0￡-X0XD1))￡ˉK */
        para->Cn = (screenPtr[2].x * displayPtr[1].x - screenPtr[1].x * displayPtr[2].x) * screenPtr[0].y +
                   (screenPtr[0].x * displayPtr[2].x - screenPtr[2].x * displayPtr[0].x) * screenPtr[1].y +
                   (screenPtr[1].x * displayPtr[0].x - screenPtr[0].x * displayPtr[1].x) * screenPtr[2].y ;
        
        /* D￡½((YD0￡-YD2) (Y1￡-Y2)￡-(YD1￡-YD2) (Y0￡-Y2))￡ˉK        */
        para->Dn = ((displayPtr[0].y - displayPtr[2].y) * (screenPtr[1].y - screenPtr[2].y)) -
                   ((displayPtr[1].y - displayPtr[2].y) * (screenPtr[0].y - screenPtr[2].y)) ;
        
        /* E￡½((X0￡-X2) (YD1￡-YD2)￡-(YD0￡-YD2) (X1￡-X2))￡ˉK        */
        para->En = ((screenPtr[0].x - screenPtr[2].x) * (displayPtr[1].y - displayPtr[2].y)) -
                   ((displayPtr[0].y - displayPtr[2].y) * (screenPtr[1].x - screenPtr[2].x)) ;
        
        
        /* F￡½(Y0(X2YD1￡-X1YD2)+Y1(X0YD2￡-X2YD0)+Y2(X1YD0￡-X0YD1))￡ˉK */
        para->Fn = (screenPtr[2].x * displayPtr[1].y - screenPtr[1].x * displayPtr[2].y) * screenPtr[0].y +
                   (screenPtr[0].x * displayPtr[2].y - screenPtr[2].x * displayPtr[0].y) * screenPtr[1].y +
                   (screenPtr[1].x * displayPtr[0].y - screenPtr[0].x * displayPtr[1].y) * screenPtr[2].y;
        
    }
    return( retTHRESHOLD ) ;
}