使用chart控件来生成曲线图，但界面上只有一条不会变化的直线

private: System::Void timer1_Tick(System::Object^ sender, System::EventArgs^ e)
{
if (time_out == 0)
{
time_out = Convert::ToInt16(comboBox5->Text);

        try
        {
            textBox5->Clear();
            System::Text::Encoding^ gb = System::Text::Encoding::GetEncoding("gb2312");
        }   
        catch (...)
        {
            tbxRecv->AppendText("串口数据写入错误\r\n");
            serialPort1->Close();
            button1_Click(sender, e);
        }
}
if (time_out == 1)
{
    time_out--;
    chart1->Series->Clear();
    chart1->ChartAreas[0]->AxisX->Maximum = 20;
    chart1->ChartAreas[0]->AxisY->Maximum = 100;

    chart1->ChartAreas[0]->AxisX->Minimum = 0;
    chart1->ChartAreas[0]->AxisY->Minimum = -10;

    System::Windows::Forms::DataVisualization::Charting::Series^ series = gcnew System::Windows::Forms::DataVisualization::Charting::Series("实时显示");
    series->ChartType = System::Windows::Forms::DataVisualization::Charting::SeriesChartType::Spline;
    series->BorderWidth = 1;
    series->ShadowOffset = 1;

    for (int i = 0; i < 19; i++)
    {
        myIntArray[i] = myIntArray[i + 1];
        series->Points->AddY(myIntArray[i]);
    }
    try
    {
        String^ str = textBox5->Text;
        String^ str1 = str->Remove(0, 4);
        String^ temp = str1->Remove(4);
        tbxTemp->Text = temp;
        String^ str2 = str->Remove(0, 13);
        tbxHumi->Text = str2;
        myIntArray[19] = Convert::ToInt32(tbxTemp->Text);
    }
    catch (...)
    {
        myIntArray[19] = 0;     
    }
    series->Points->AddY(myIntArray[19]);
    chart1->Series->Add(series);
}
else time_out--;

}

调试下 myIntArray[i] 这里是不是所有的数据都一样。