BSP Graphics & IF_GRAPH_DATA_MODEL

Question

Hello All,
I am, once again, trying to generate an MTA in BSP using <graphics:chart>. I already managed to generate the MTA hard-coding the values into the BSP page (this was fine for a prototype presentation), but now I have to integrate the MTA using data coming from a cube. 
I have created an internal table holding the data from the cube which looks something like this:
  Milestone    Actual Date     Plan Date
    M100         20060101       20060101
    M200         20060301       20060201
I have implemented (as suggested in my previous post by Raja:  BSP Graphics Extension (MTA))
a class with the interface IF_GRAPH_DATA_MODEL and have included all of the suggested coding from Raja's post, the only stuff I added being bold:
TYPES: BEGIN OF t_point_data,
               tooltip TYPE string,
               value   TYPE string,
               <b>value2  TYPE string,</b>
         END OF t_point_data.
  TYPES: t_point_data_tab TYPE STANDARD TABLE OF t_point_data.
  DATA: BEGIN OF t_series_data,
          tooltip    TYPE string,
          label      TYPE string,
          point_data TYPE t_point_data_tab,
        END OF t_series_data.
  DATA: l_ixml                                 TYPE REF TO if_ixml,
        l_ixml_sf                              TYPE REF TO if_ixml_stream_factory,
        l_istream                              TYPE REF TO if_ixml_istream,
        l_ostream                              TYPE REF TO if_ixml_ostream,
        l_document                             TYPE REF TO if_ixml_document,
        l_parser                               TYPE REF TO if_ixml_parser,
        l_root_element                         TYPE REF TO if_ixml_element,
        l_categories_element                   TYPE REF TO if_ixml_element,
        l_series_1_element                     TYPE REF TO if_ixml_element,
        l_series_2_element                     TYPE REF TO if_ixml_element,
        l_c_element                            TYPE REF TO if_ixml_element,
        l_s_element                            TYPE REF TO if_ixml_element,
        l_series_1_data                        LIKE t_series_data,
        l_series_2_data                        LIKE t_series_data,
        l_point_data                           TYPE t_point_data,
        l_category_name                        TYPE string,
        l_category_data_tab                    TYPE STANDARD TABLE OF string,
        l_tooltip                              TYPE string,
        l_apostrophe                           TYPE string VALUE  ''''.
  FIELD-SYMBOLS: <l_line> TYPE /sie/sbds_mta,
                 <l_field> TYPE ANY.
* fill category data <outtab> is an itab holding the values to be passed to graph
  LOOP AT outtab ASSIGNING <l_line> .
    ASSIGN COMPONENT 1 OF STRUCTURE <l_line> TO <l_field> .
    APPEND <l_field> TO l_category_data_tab.
  ENDLOOP .
* fill data for series 1
  LOOP AT outtab ASSIGNING <l_line> .
    ASSIGN COMPONENT 2 OF STRUCTURE <l_line> TO <l_field> .
    l_series_1_data-tooltip = 'Actual'.
    l_series_1_data-label   = 'Actual'.
    l_point_data-tooltip    = <l_field>.
    l_point_data-value      = <l_field>.
    <b>l_point_data-value2     = <l_field>.</b>
    APPEND l_point_data TO l_series_1_data-point_data.
  ENDLOOP .
* fill data for series 2
  LOOP AT outtab ASSIGNING <l_line> .
    ASSIGN COMPONENT 3 OF STRUCTURE <l_line> TO <l_field> .
    l_series_2_data-tooltip = 'Plan'.
    l_series_2_data-label   = 'Plan'.
    l_point_data-tooltip    = <l_field> .
    l_point_data-value      = <l_field>.
    <b>l_point_data-value2     = <l_field>.</b>
    APPEND l_point_data TO l_series_2_data-point_data.
  ENDLOOP .
  l_ixml = cl_ixml=>create( ).
  l_ixml_sf = l_ixml->create_stream_factory( ).
  l_document = l_ixml->create_document( ).
  l_root_element = l_document->create_element( name = 'SimpleChartData' ).
  l_root_element->set_attribute( name = 'version' value = '1.0' ).
  l_document->append_child( new_child = l_root_element ).
* create category xml
  l_categories_element = l_document->create_simple_element( parent = l_root_element  name = 'Categories' ).
  LOOP AT l_category_data_tab INTO l_category_name.
    l_c_element = l_document->create_simple_element( parent = l_categories_element  name = 'C' value = l_category_name ).
  ENDLOOP.
* create series 1 xml
  l_series_1_element = l_document->create_simple_element( parent = l_root_element  name = 'Series' ).
  l_tooltip = 'title='.
  CONCATENATE l_tooltip l_apostrophe l_series_1_data-tooltip l_apostrophe INTO l_tooltip.
  l_series_1_element->set_attribute( name = 'extension' value = l_tooltip ).
  l_series_1_element->set_attribute( name = 'label' value = l_series_1_data-label ).
  LOOP AT l_series_1_data-point_data INTO l_point_data.
    l_s_element = l_document->create_simple_element( parent = l_series_1_element  name = 'S' value = l_point_data-value ).
    l_tooltip = 'title='.
    CONCATENATE l_tooltip l_apostrophe l_point_data-tooltip l_apostrophe INTO l_tooltip.
    l_s_element->set_attribute( name = 'extension' value = l_tooltip ).
  ENDLOOP.
* create series 2 xml
  l_series_2_element = l_document->create_simple_element( parent = l_root_element  name = 'Series' ).
  l_tooltip = 'title='.
  CONCATENATE l_tooltip l_apostrophe l_series_2_data-tooltip l_apostrophe INTO l_tooltip.
  l_series_2_element->set_attribute( name = 'extension' value = l_tooltip ).
  l_series_2_element->set_attribute( name = 'label' value = l_series_2_data-label ).
  LOOP AT l_series_2_data-point_data INTO l_point_data.
    l_s_element = l_document->create_simple_element( parent = l_series_2_element  name = 'S' value = l_point_data-value ).
    l_tooltip = 'title='.
    CONCATENATE l_tooltip l_apostrophe l_point_data-tooltip l_apostrophe INTO l_tooltip.
    l_s_element->set_attribute( name = 'extension' value = l_tooltip ).
  ENDLOOP.
  l_ostream = l_ixml_sf->create_ostream_xstring( xml ).
  l_document->render( ostream = l_ostream ).
The problem I am having, and the reason I have added those lines of coding in bold, is that the MTA needs two date point to create a point on the chart. The internal table which holds the mta data is passing my values along just fine, but the method is missing the part where I create the two point values to be plotted on the graph.
I would be thankful if someone could help me figure this one out - I simply don't get it
Thanks a lot
Svenja

Answer 1

Hi,
what exactly is the problem?
Using the documentation about the data XML of the chart engine you should get the idea how the data is to be structured.
And finally use create_simple_element of iXML to create it accordingly. Take care of defining the correct parent node
Regards, Kai