Difference: CDOverviewDatasetDefinition (3 vs. 4)

Revision 42011-11-08 - JeanNeron

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META TOPICPARENT	name="CDChartDirectorDesignerAPI"

Datasets Overview

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All of the above can be named, or not. If you are working with multiple layers, data groups, data set templates or data sets, you can name them to make charting easier. If you only need one layer, data group, data set template, etc, then you can leave the names blank when you create them.

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Attributes of 'layers', 'data groups', and 'data set templates' can all be set individually, ie, you can change the color or shape of all the bars in a 'data group' to make it different from other bars. The Layer type will determine how the data will be presented, ie, you can have an XY layer type for bar charts, an Area layer for area charts, etc. You can render more than one layer on a chart, combining the various chart types.

For example, let's say we have network usage for 3 different servers for a one week period (Mon - Sun). First we would initialize a 'data set' for one of the servers (possibly naming it 'server 1') via .DATASET INITIALIZE. Then we would add each days network usage for that server via .POINT ADD NEW. We would repeat the steps for the second and third server, naming each 'data set' as appropriate. We now have three 'data sets' that contain the 'data points' of the network usage for each server. To plot this on a bar chart, we would create a 'Layer' for our chart via .XY ADD BAR LAYER, then add a 'data group' via .LAYER ADD DATA GROUP. Next we would add 'data set templates' for each of the 3 servers via .LAYER ADD DATASET. This defines the presentation of our chart, without referring to the actual data. To add the data to our chart, would use .LAYER LINK DATASET to link our previously entered data with the 'data set templates'

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