Obtains the value of a data point in a series in a graph.
Graph controls in windows and user objects, and graphs in DataWindow controls
controlname.GetDataValue ( { graphcontrol, } seriesnumber, datapoint,
datavariable {, xory } )
Argument |
Description |
|---|---|
controlname |
The name of the graph from which you want data, or the name of the DataWindow control containing the graph. |
graphcontrol (DataWindow control only) |
(Optional) A string whose value is the name of the graph in the DataWindow control from which you want the data. |
seriesnumber |
The number that identifies the series from which you want data. |
datapoint |
The number of the data point for which you want the value. |
datavariable |
The name of a variable that will hold the data value. The variable’s datatype can be date, DateTime, double, string, or time. The variable must have the same datatype as the values axis of the graph. |
xory (scatter graph only) |
(Optional) A value of the grDataType enumerated datatype specifying whether you want the x or y value of the data point in a scatter graph. Values are:
|
Integer. Returns 1 if it succeeds and -1 if an error occurs. If any argument’s value is null, GetDataValue returns null.
GetDataValue retrieves data from any graph. The data is stored in datavariable, whose datatype must match the datatype of the graph’s values axis. If the values axis is numeric, you can also use the GetData function.
These statements obtain the data value of data point 3 in the series named Costs in the graph gr_computers in the DataWindow control dw_equipment:
integer SeriesNbr, rtn
double data_value
// Get the number of the series.
SeriesNbr = dw_equipment.FindSeries( &
"gr_computers", "Costs")
rtn = dw_equipment.GetDataValue( &
"gr_computers" , SeriesNbr, 3, data_value)
These statements obtain the data value of the data point under the mouse pointer in the graph gr_prod_data and store it in data_value. If the user does not click on a data point, then ItemNbr is set to 0. The categories of the graph are time values:
integer SeriesNbr, ItemNbr, rtn
time data_value
grObjectType MouseHit
MouseHit = &
gr_prod_data.ObjectAtPointer(SeriesNbr, ItemNbr)
IF ItemNbr > 0 THEN
rtn = gr_prod_data.GetDataValue( &
SeriesNbr, ItemNbr, data_value)
END IF
These statements obtain the x value of the data point in the scatter graph gr_sales_yr and store it in data_value. If the user does not click on a data point, then ItemNbr is set to 0. The datatype of the category axis is Date:
integer SeriesNbr, ItemNbr, rtn
date data_value
gr_product_data.ObjectAtPointer(SeriesNbr, ItemNbr)
IF ItemNbr > 0 THEN
rtn = gr_sales_yr.GetDataValue( &
SeriesNbr, ItemNbr, data_value, xValue!)
END IF
