This section describes all of the functions of Topog_Chart
and how to use them. The 14 individual function buttons contained
in the menu window are shown in
Figure 7.1.
The Files function button is used to plot a range of standard
Topog x-y data sets. When the button is clicked on the program
searches for the following files in the operative directory.
- .hyd files produced by Topog_Dynamic
- .soil files produced by Topog_Soil
- .climate files produced by Topog_Climate
When detected, these are listed in the selection area of the
menu window. Each of these file types has a header which
lists the names of the columns in the file (eg: gross rainfall).
Therefore, attributes within the file can be selected on the
basis of their column name.
When a .hyd or .climate file
is selected, the program assumes
that the time attribute will be on the x axis; therefore
only a single attribute needs to be selected for plotting.
As .soil files are not time series file the user must
choose both x and y attributes.
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Example 1
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The user wants to plot predicted transpiration versus
time from a file called
test.run001.hyd.
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Press the Files button in the menu window
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A list of plotable files is listed in the
selection area including the file called
test.run001.hyd
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Select the "test.run001.hyd"
option from the selection area
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A list of file attributes appears in the
selection area
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Select the "Transpiration" option from
the selection area
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A plot of transpiration versus time appears
in the display window. The default
line style
is a line graph; you can change this style
using the Style button (see section
7.4.3)
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Example 2
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The user wants to plot the psi versus theta relation
computed for a soil and stored in a file called
test.soil.
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Press the Files button in the menu window
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A list of plotable files is listed in the
selection area including the file called
test.soil
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Select the "test.soil" option
from the selection area
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The file attributes "psi", "theta" and
"conductivity" are listed in the
selection area
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Select the "theta" option for the horizontal
(x) axis, then select the "psi" option for the
vertical (y) axis
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A plot of psi versus theta appears in the
display window. Because the relationship
between these two soil parameters is highly
non-linear you may need to convert the y axis
to a negative log format using the Axes
function button (see section
7.4.9)
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The Other function button is used to plot non-standard column
data files, arranged in a free format.
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Example 3
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The user wants to a display a non-standard data file with
three columns, arranged in free format.
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Press the Other button in the
menu window
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The message "Enter file name" appears in
the selection area
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Enter the name of the file you wish to plot
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The file is read into memory and the file
attributes are listed in the selection area
as "Column 1", "Column 2" and "Column 3"
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Select the "Column 1" option,
then the "Column 2" option
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A plot of "Column 2" versus "Column 1" appears
in the display window
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The Style function button is used to change the plot style.
When the button is clicked on the available options are listed in the
selection area . The options include:
- line graphs
- filled line graphs (using either y=0 or the x axis as the baseline)
- histograms (using either y=0 or the x axis as the baseline)
- scatter plots
Whenever the user changes the style the selection applies only to the last
and next attribute plotted. To change the style of a plot displayed a
few selections back the user must first make it active using the
Select function button (see section 7.4.4).
Note that the histogram plot style can only be applied to
data sets with a linear x-axis.
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Example 4
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The user wants to change a data plot from the
default style (line graph) to a histogram.
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Press the Style button in the
menu window
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A list of styles is displayed in the
selection area
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Select the "Histogram" option from the
selection area
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The data is replotted in the
display window in the form of a histogram
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The Select function button is used to make any one of many
data sets displayed in the display window active. It is
needed in case the user has to go back to an attribute and
change its colour or plot style. This function is also used
to change the attribute labels provided in the legend.
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Example 5
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The user plots three different attributes in a plot but
now wants to go back and change the style of the first
attribute plotted.
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Press the Select button in the
menu window
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A list of all attributes currently plotted in the
display window is listed in the
selection area. Also shown with each
attribute is the source file name
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Select the attribute of interest from the
selection area, then change the style
using the Style function button
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The data is replotted in the
display window using the new style
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Example 6
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The user wants to change an attribute label in the legend.
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Plot a data set in the display window,
press the Annotate function button
(see section
7.4.6) in the menu window, then select
the "Turn Legends on" option listed in the
selection area
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The plot appears in the display window along
with a legend placed in the upper left-hand
corner of the plot
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Press the Select button in the
menu window
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A list of all attributes currently plotted in
the display window is listed in the
selection area. Also shown with each
attribute is the source file name
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Select the attribute of interest. Press the
backspace key on the keyboard once
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The attribute label appears in the selection area
beneath a message reading "enter text"
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Keep pressing the backspace key to delete unwanted
text, then replace this by typing in new text in
the selection area. Press <Return>
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The legend is redrawn in the display window
using the new attribute label
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The Colours function button is used to change the colour of plot
lines, points and line fills (eg: histograms).
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Example 7
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The user wants to change the colour of a plotted attribute.
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Press the Colours button in the
menu window
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A list of all attributes currently plotted
in the display window is listed in the
selection area. Also shown with each
attribute is the source file name
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Select the attribute of interest from the
selection area
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A colour palette appears in the information area
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Select the desired colour from the colour palette
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The data is replotted in the
display window using the new colour
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