[英]Using a C# WinForms control in a C++/CLI (WinForms) application
[英]Color or Highlight a data point in graph in winforms in visual studio using c# or cli/c++
我正在通過從數據庫中選取數據在Winform中繪制圖形。 它工作正常。 我需要的是,如果某些數據值大於最大值,則圖形中的該點將變為高亮或紅色。 我怎樣才能做到這一點? 請幫忙。
String^ constring = L"datasource=localhost;port=3306;username=root;password=root;";
MySqlConnection^ conDataBase = gcnew MySqlConnection(constring);
MySqlCommand^ cmdDataBase = gcnew MySqlCommand("select * from `data`.`test`;",conDataBase);
MySqlDataReader^ myReader;
try{
conDataBase->Open();
myReader = cmdDataBase->ExecuteReader();
// MessageBox::Show("Data Inserted");
while(myReader->Read()){
String^ v_datetime;
String^ v_temp;
v_datetime = myReader->GetString("datetime");
v_pressure = myReader->GetInt32("temp").ToString();
String^ status;
if (myReader->GetInt32("temp") > 1000 && myReader->GetInt32("temp") < 50 )
{
status = " Abnormal ";
**// and this point only should be highlited or different color in the graph**
}
else{
status = " Normal";
}
this->label3->Text = status;
this->chart2->Series["Temperature"]->Points->AddXY(v_datetime,myReader->GetInt32("temp"));
// comboBox1->Items->Add(vName);
}
}catch(Exception^ex){
MessageBox::Show(ex->Message);
}
您不能在類中添加表示要繪制的對象的屬性,並且在繪制圖形時要在此屬性上進行測試並更改顏色,形狀和大小。
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