Modifying graph properties – PB Docs 70

Modifying graph properties

When you define a graph in the Window or User Object painter,
you specify its behavior and appearance. For example, you might
define a graph as a column graph with a certain title, divide its
Value axis into four major divisions, and so on. Each of these entries
corresponds to a property of a graph. For example, all graphs have
an enumerated attribute GraphType, which specifies the type of graph.

note.gif When dynamically changing the graph type If you change the graph type, be sure to also change the other
properties as needed to properly define the new graph.

You can change these graph properties at execution time by
assigning values to the graph’s properties in scripts.
For example, to change the type of the graph gr_emp to
Column, you could code:

To change the title of the graph at execution time, you could
code:

How parts of a graph are represented

Graphs consist of parts: a title, a legend, and axes. Each
of these parts has a set of display properties. These display properties
are themselves stored as properties in a subobject (structure) of
Graph called grDispAttr
.

For example, graphs have a Title property, which specifies
the title’s text. Graphs also have a property TitleDispAttr,
of type grDispAttr, which itself contains properties that specify
all the characteristics of the title text, such as the font, size,
whether the text is italicized, and so on.

Similarly, graphs have axes, each of which also has a set
of properties. These properties are stored in a subobject (structure)
of Graph called grAxis
. For example, graphs
have a property Values of type grAxis, which contains properties
that specify the Value axis’s properties, such as whether
to use auto scaling of values, the number of major and minor divisions,
the axis label, and so on.

Here is a representation of the properties of a graph:

Referencing parts of a graph

You use dot notation to reference these display properties.
For example, one of the properties of a graph’s title is
whether the text is italicized or not. That information is stored
in the boolean Italic property in the TitleDispAttr property of
the graph.

For example, to italicize graph gr_emp’s
title, code:

Similarly, to turn on autoscaling of a graph’s Values
axis, code:

To change the label text for the Value axis, code:

To change the alignment of text in the Value axis’s
label text, code:

For a complete list of graph properties, see Objects
and Controls

or use the Browser.

For more about the Browser, see the PowerBuilder User’s
Guide

.


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