1.18.1.4.3 Graph Preview Dialog

Graph Preview Dialog This section shows how to create custom dialog with a graph preview.

Prepare Dialog Resource

We first need a dialog resource containing a static control, in which the preview graph will nest. Here we will use a built-in resource, IDD_SAMPLE_SPLITTER_DLG, in OriginC\Originlab\ODlg8.dll.

Prepare Source File

In Code Builder, click New button, type file name, and set Location as the same path of the above dialog resource dll oDlg8.dll - Origin install path OriginC\Originlab subfolder.

Including Needed Headers

//These headers contain declarations of dialog and controls
#include <..\Originlab\DialogEx.h>
#include <..\Originlab\GraphPageControl.h>

Adding User Defined Preview ClassClasses, User Defined

//forbid some action on preview graph
#define PREVIEW_NOCLICK_BITS (NOCLICK_DATA_PLOT|NOCLICK_LAYER|NOCLICK_LAYERICON)

#define PREVIEW_TEMPLATE    "Origin" //preview graph template

class   MyPreviewCtrl
{
public:
    MyPreviewCtrl(){}
    ~MyPreviewCtrl()
    {
        //destroy temporary books when dialog closed.
        if ( m_wksPreview.IsValid() )
            m_wksPreview.Destroy();
    }
    
    void    Init(int nCtrlID, WndContainer& wndParent)
    {
        //create preview graph control
        Control ctrl = wndParent.GetDlgItem(nCtrlID);
        GraphControl gCtrl;
        gCtrl.CreateControl(ctrl.GetSafeHwnd());
        gCtrl.Visible = true;
        
        GraphPageControl gpCtrl;
        gpCtrl.Create(gCtrl, PREVIEW_NOCLICK_BITS, PREVIEW_TEMPLATE);
        GraphPage gpPreview;
        gpPreview = gpCtrl.GetPage();
        gpPreview.Rename("MyPreview");
        m_glPreview = gpPreview.Layers(0); //first layer
        
        if ( !m_wksPreview )
        {
            //temporary worksheet to hold preview data.
            m_wksPreview.Create("Origin", CREATE_TEMP);
            m_wksPreview.SetSize(-1, 2); //two columns
            
            //long name will be displayed as axis title
            Column colX(m_wksPreview, 0);
            colX.SetLongName("Preview X");
            Column colY(m_wksPreview, 1);
            colY.SetLongName("Preview Y");
            
            //prepare datarange
            DataRange drPrev;
            drPrev.Add(m_wksPreview, 0, "X");
            drPrev.Add(m_wksPreview, 1, "Y");
            
            //plot preview curve, although it has no points now.
            int nPlot = m_glPreview.AddPlot(drPrev, IDM_PLOT_LINE);
            DataPlot dp = m_glPreview.DataPlots(nPlot);
            if ( dp ) //set preview curve color
                dp.SetColor(SYSCOLOR_RED);
        }
    }
    
    //update preview curve with external data.
    void    Update(const vector& vX, const vector& vY)
    {
        if ( m_wksPreview.IsValid() )
        {
            Dataset dsX(m_wksPreview, 0);
            Dataset dsY(m_wksPreview, 1);
            if ( !dsX.IsValid() || !dsY.IsValid() )
                return; //no columns for preview
            
            //update source data will also update preview graph.
            dsX = vX;
            dsY = vY;
            //rescale graph for better view.
            m_glPreview.Rescale();
        }
    }
    
private:
    //preview graph on dialog
    GraphLayer  m_glPreview;
    
    //temporary worksheet to put preview data.
    Worksheet   m_wksPreview;
};

Adding Dialog Class

class   MyGraphPreviewDlg : public MultiPaneDlg
{
public:
    //dialog resource ID and the DLL containing it.
    MyGraphPreviewDlg() : MultiPaneDlg(IDD_SAMPLE_SPLITTER_DLG, 
        GetAppPath(TRUE) + "OriginC\\Originlab\\ODlg8")
    {
    }
    
    ~MyGraphPreviewDlg()
    {
    }
    
    int     DoModalEx(HWND hParent = NULL)
    {
        InitMsgMap();
        
        //show dialog until user closes it.
        return DoModal(hParent, DLG_NO_DEFAULT_REPOSITION);
    }     
    
protected:
EVENTS_BEGIN
	ON_INIT(OnInitDialog) 
	ON_BN_CLICKED(IDC_LOAD, OnDraw)
EVENTS_END

    //message handler of dialog events
    BOOL    OnInitDialog();
    BOOL    OnDraw(Control ctrl);
    
private:
    //member stands for the preview control
    MyPreviewCtrl       m_Preview;
};

BOOL MyGraphPreviewDlg::OnInitDialog()
{
	m_Preview.Init(IDC_FB_BOX, *this);
	Button btn = GetItem(IDC_LOAD);
	if( btn )
		btn.Text = "Draw";
	return true;
}

BOOL MyGraphPreviewDlg::OnDraw(Control ctrl)
{
	vector vecX, vecY;
	vecX.Data(1.0, 10.0, 0.5);
	vecY.SetSize(vecX.GetSize());	
	for(int ii = 0; ii < vecX.GetSize(); ++ii)
		vecY[ii] = rnd();
	
	m_Preview.Update(vecX, vecY);
	return true;
}

Open the Dialog

void open_preview_dlg()
{
	MyGraphPreviewDlg dlg;
	dlg.DoModalEx(GetWindow());
	return;
}

Execute the function above, and click the Draw button. You will notice the preview be updated.