Interactive Pie Chart

Description

This example shows how to use the Microsoft Office Chart ActiveX Control.

Example

To run this sample Xdialog script, you must have Microsoft Office installed on your machine.

Dimension variables and create initial data to display in the chart.

dim lv as P
dim Departments as C
dim data as C
dim labels[1] as C
dim values[1] as N
dim vl as P
dim shared Chart as P
dim Graph as P
dim Graph.object as P
dim Graph.class as C
lv = local_variables()
Departments = <<%a%
Sales
Marketing
R&D
Shipping
Accounting
%a%
data = <<%a%
123
234
211
12
97
%a%

Create the display code for the dialog box.

' The chart Graph
Graph.class="owc.chart"
dlg_title = "Pie Chart"
dlg_source = <<%dlg%
{can_exit=close}
{startup=init}
{wrap=100}
{lf};
{font=tahoma,8}
Enter a list of departments, one per line. In the Data column enter the corresponding value for each department. as you type, the graph is updated.;
{lf};
{region}
Departments:| Data;
[%m%.50,7departments!data_change] | [%m%.25,7data!data_change];
{endregion};
{region001}
{activex=100,25Graph};
{endregion001};
{initial_focus}<%i=$a5_window_close;O={J=C} {I=1} Close; %18,1.5&Close!close>;
%dlg%

Create the event handler code and the chart object. SetData()is a chart method.

dlg_event = <<%code%
if (a_dlg_button = "close") .or. (a_dlg_button = "") then
    ui_modeless_dlg_close(dlg_title)
end if
if (a_dlg_button = "init") then
    a_dlg_button = ""
    initialize_arrays(lv)

    ' Add a chart to the graph object
    Chart = Graph.object.Charts.Add()
    Chart.HasTitle = .t.
    Chart.Title.Caption = "Pie Graph"
    Chart.Type = 18 ' Pie - See the list at the bottom for other types.
    Chart.HasLegend = .t.
    ' Add the two series
    dim series as P
    Series = Chart.SeriesCollection.Add()
    Series.Caption = "None"
    Series.SetData(1, -1, Labels)
    Series.SetData(2, -1, Values)
   
' Refer to XY Graph
    Graph.object.Refresh()
end if
if a_dlg_button ="data_change" then
    initialize_arrays(lv)
    Series.SetData(1, -1, Labels)
    Series.SetData(2, -1, Values)
   
' Refer to XY Graph
    Graph.object.Refresh()
end if
%code%

Display the dialog box.

ui_modeless_dlg_box(dlg_title, dlg_source, dlg_event)

Redefine the chart object when the data changes.

function initialize_arrays as V (vars as P)
with vars
    dim count as N
    count = line_count( alltrim(Departments) )
    if count = 0 then
        exit function
    end if
    labels.resize(count)
    values.resize(count)
    labels.clear()
    values.clear()
    for i = 1 to count
        labels[i] = word( Departments,i,crlf() )
        values[i] = val( word( data,i,crlf() ) )
    next i
end with
end function

Limitations

Desktop applications only.