6.9 Scatter Graphs

The Scatter graphs plot ordered pairs of data values against appropriately scaled x and y-axes. The data points can be connected with a line. The data points can be optionally covered by wigets or point objects.

The appearance of the data line and wigets is determined by the style object of the individual data items.

Scatter graphs usually use the CX_AXIS_XYSCATTER axis type. Both axes are scaled numerically using SRGDecimalScale, SRGLogScale (if the graph is logarithmic), or SRGDateScale (for time values). If one of the axes is to be labeled with dates or times, CX_AXIS_SCATTER_DATEX and CX_AXIS_SCATTER_DATEY are available. Remove the labels on the x and y-axes by calling pD->GetStyle()->SetShowIndices(FALSE) and SetShowNumerals(FALSE), respectively.

Three Scatter graph types are provided to accept data in three different formats:

• XY Scatter-Alternating graph

• XY Scatter by Group graph

• XY Scatter by Index graph

• Extended XY Scatter graphs

Figure 93: CX_GRAPH_XYSCATTERA

This graph style accepts X,Y data alternately from the data array. The first value in the scope is taken as X, the second as Y, and so on. If the number of indices in a group is uneven, the graph will treat the first entry on each alternate line as Y data, but it will always stick to the x,y, x,y format.

Figure 94: CX_GRAPH_XYSCATTERG

This style treats even groups as X data and odd groups as Y data.

Figure 95: CX_GRAPH_XYSCATTERI

This style takes X data from the even indices and Y data from odd indices.

CX_GRAPH_XYSCATTERA_EX

CX_GRAPH_XYSCATTERG_EX

CX_GRAPH_XYSCATTERI_EX

If logarithmic scaling is specified for the standard Scatter charts by calling pD->GetStyle()->SetLog(TRUE), where pD is a pointer to the display component, both axes use logarithmic scaling. The Extended graph types allow logarithmic scaling to be used on one axis with linear scaling on the other.

With these graph types,

• Call SetLog(TRUE) for a log y-axis

• Call SetLogX(TRUE) for a log x-axis

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