Question

我有两个系列 - 两个不同的大小。下面的屏幕显示糟糕的汇总。我使用下面的代码来汇总2个系列。

version
PostgreSQL 9.5.5 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 5.4.0-6ubuntu1~16.04.2) 5.4.0 20160609, 64-bit

SDIAppForm-＆gt; Chart4-＆gt; Series [4] - ＆gt; DataSources-＆gt; Add（SDIAppForm-＆gt; Chart4-＆gt; Series [3]）; SDIAppForm-＆gt; Chart4-＆gt; Series [4] - ＆gt; DataSources-＆gt; Add（SDIAppForm-＆gt; Chart4-＆gt; Series 1）;

SDIAppForm-＆GT; Chart4-＆GT;系列[4] - ＆GT; CheckDataSource（）;

Series1 and Series3 are red colour, Black is wrong summ (partially overlap series 3

你有什么简单的想法我怎么解决问题？我不是TeeChart的专家，所以我会以简单的例子来说明如何解决这个问题。

Answer 1

使用插值函数解决问题

    float InterpolateLineSeries_Power(  double XValue, int APMChart4SeriesCounter_)
 // FirstIndex, LastIndex: Integer; XValue: Double): Double;
{
  int Index=0;
  double dx,dy;
               for ( Index = SDIAppForm->Chart4->Series[APMChart4SeriesCounter+3]->FirstDisplayedIndex(); Index < SDIAppForm->Chart4->Series[APMChart4SeriesCounter+3]->LastValueIndex ; Index++) {
                 if ((SDIAppForm->Chart4->Series[APMChart4SeriesCounter+3]->XValues->Value[Index])>XValue)  break;

               }


  //safeguard
  if (Index<1)  Index=1;
  else if (Index>=SDIAppForm->Chart4->Series[APMChart4SeriesCounter+3]->Count())  Index=SDIAppForm->Chart4->Series[APMChart4SeriesCounter+3]->Count()-1;

  // y=(y2-y1)/(x2-x1)*(x-x1)+y1
  dx=SDIAppForm->Chart4->Series[APMChart4SeriesCounter+3]->XValues->Value[Index] - SDIAppForm->Chart4->Series[APMChart4SeriesCounter+3]->XValues->Value[Index-1];
  dy=SDIAppForm->Chart4->Series[APMChart4SeriesCounter+3]->YValues->Value[Index] - SDIAppForm->Chart4->Series[APMChart4SeriesCounter+3]->YValues->Value[Index-1];

  if (dx!=0)
    return dy/dx*(XValue - SDIAppForm->Chart4->Series[APMChart4SeriesCounter+3]->XValues->Value[Index-1]) + SDIAppForm->Chart4->Series[APMChart4SeriesCounter+3]->YValues->Value[Index-1] ;
  else  return 0;
}

2系列（不同尺寸）的坏总和

1 个答案: