Axis.setLabels2

ChartDirector Ver 3.1 (PHP Edition Edition)

Axis.setLabels2

Usage

setLabels2(labels[, formatString ])

Description

Set the numeric/date/time labels to be used on the axis.

This method is typically used to set the x-axis to enumerated scale. For more details on what is enumerated axis scale, please refer to Axis.setLabels.

This method assumes the labels are in their "native" form (that is, not formatted). Please refer to Date Representation for the native date/time formats supported in ChartDirector.

If the labels are already formatted into human readable form (that is, they are text strings), use Axis.setLabels instead.

In some cases, it may be desirable to skip some labels (e.g. draw one label per five data points). If you want to leave a label position empty, use NoValue as the axis label. If you want to draw just a minor tick at a label position with no label text, use MinorTickOnly ( = -1.7e308) as the axis label.

Arguments

Argument	Default	Description
labels	(Mandatory)	An array of numbers/dates to be used as the axis labels.
formatString	""	A format string to specified how to format the labels into human readable form. Please refer to Axis.setLabelFormat for the syntax of the format string. An empty string means the format will be automatically determined.

Return Value

A TextBox object that represents the prototype of the axis labels. You may use the methods of this object to fine-tune the appearance of the axis labels.

ted. All rights reserved. completely negative.

For a purely positive axis, the bottom end has "zero affinity". That means ChartDirector will tend to choose 0 as the bottom end because zero is a natural starting point for the axis. However, if the data range is too extreme (e.g. the data is in the range 10000 - 10005), it may be "unreasonable" to choose 0 as the axis starting point. In this case, ChartDirector will not use 0 as the axis starting point.

ChartDirector will determine that it is "unreasonable" to use 0 as the axis starting point if the data fluctuation (the difference between the maximum and minimum data values) is too small compare with the data value. ChartDirector test the "too small" condition using the formula:

maxDataValue * zeroAffinity < minDataValue

where zeroAffinity by default is 0.8.

Similar "zero affinity" mechanism applies to the top end of the axis for a purely negative axis. If the data range contains both positive and negative values, the zero point is always included.

The zeroAffinity argument of the setAutoScale method allows you to modify the zero affinity when performing auto-scaling. Zero affinity should be between 0 and 1. A large value encourages ChartDirector to start the axis from zero.

A zero affinity of 1 means the axis always includes the zero point. A zero affinity of 0 means that the axis is scaled purely according to the data range, without any preference for the zero point.

Note that zero affinity is ignored for log scale axis as log scale axis cannot contain 0.

Arguments

Argument	Default	Description
topExtension	0.1	The top portion of the axis that no data point should fall into. For example, a value of 0.2 means no data value will fall within the top 20% of the axis. The topExtension must be between 0 to 1.
bottomExtension	0.1	The bottom portion of the axis that no data point should fall into. For example, a value of 0.2 means no data value will fall within the bottom 20% of the axis. The bottomExtension must be between 0 to 1.
zeroAffinity	0.8	The tendency of ChartDirector to include zero in the axis during auto-scaling. The value must be between 0 and 1. A large value encourages ChartDirector to start the axis from zero. A value of 1 means the axis always includes the zero point. A value of 0 means there is no preference for the zero point during auto-scaling.

Return Value

None

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(1059, '1999-03-01', '371', '635', '722');