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Chapter 7 ....continued
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The Annotate function button is used to create text strings which can be mapped in the display window. The user is provided with a range of font sizes and styles though the colour of text strings cannot be changed. This function button is also used to turn the legend on and off.
7.4.6
The Annotate button
Example 8 The user wants to write a string of text to the display window.
Press the Annotate button in the menu window 
The message "New >" appears in the selection area
Select the "New >" option in the selection area The message "enter text" appears in the selection area
Type the desired text into the selection area, then press <Return> The text string appears highlighted at the top of the selection area and a font palette appears in the information area
Select the desired font type and size from the font palette in the information area Click the mouse in the desired location in the display window The text appears in the display window
Example 9 The user wants to modify and move an existing annotation to another position in the display window.
Press the Annotate button in the menu window A list of all currently displayed annotations appears in the selection area
Select the desired text item in the selection area, then press <Return> A font palette appears in the information area
Select the new font type and size from the font palette in the information area The new font type and size is applied to the selected annotation
Click the mouse in the new location in the display window The text appears in the display window in the new position
Example 10 The user wants to show the legends in the display window.
Press the Annotate button in the menu window The message "Turn Legends on" appears in the selection area
Select the "Turn Legends on" option in the selection area A legend for each appears for each plot in the display window. Note that the option in the selection area has now changed to "Turn Legends off". Select this option to remove the legend
The CLEAR function button is used to delete data plots from the display window. It allows both selective and total clearing of the display window. To clear everything, press the CLEAR button twice. Annotations can not be cleared from the display window using this function. They need to be dragged from the window using the mouse.
7.4.7
The CLEAR button
Example 11 The user wants to clear a plotted attribute from the display window.
Press the CLEAR button in the menu window 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
Select the attribute of interest from the selection area The attribute is cleared from the display window
The Grid function button is used to modify the major (ie: labelled) and minor tick marks on the x and y axes. When Topog_Chart first generates a plot it attempts to give an even spread of tick marks and tick labels; these change automatically as more or less plot frames are created in the display window. However, the user may wish to manually set the number of tick marks; this is done using the Grid button.
7.4.8
The Grid button
The Grid function button is also used to superimpose a reference grid over the plot frame. Just press the button twice and a series of horizontal and vertical lines will be drawn over the plot frame. These have the same interval spacing as the major tick marks on both axes.
Example 12 The user wants to change the tick mark spacings on the y axis of a plot.
Plot a data set in the display window Press the Grid button in the menu window The current settings for the major and minor tick intervals on both axes are listed in the selection area
Select the "Y major tick interval :" option from the selection area The message "Enter Y major tick interval :" appears in the selection area above the current value
Delete the old value using the backspace key then enter the desired interval by typing it in the selection area. Press <Return> when finished The plot is redrawn in the display window using the new Y major tick interval
Return to the selection area and select the "Y minor tick interval :" option The message "Enter Y minor tick interval :" appears in the selection area above the current value. Note that this value refers to the number of tick included between each major tick mark
Delete the old value using the backspace key then enter the desired interval by typing it in the selection area. Press <Return> when finished The plot is redrawn in the display window using the new Y minor tick interval
The Axes function button is used to change the format of the x and y plot axes. It allows you to define either axis as linear, positive log or negative log, and also lets you invert either axis. The axis formats are applied by toggling options listed in the selection area.
7.4.9
The Axes button
Example 13 The user wants to display a psi versus theta curve from a .soil file, using a log y axis for psi and linear x axis for theta.
Press the Files button in the menu window A list of plottable files is listed in the selection area including the .soil file of interest
Select the .soil file from the selection area The file attributes "psi", "theta" and "conductivity" are listed in the selection area
Select the "theta" option for the horizontal (x) axis, then select the "psi" option for the vertical (y) axis A plot of psi versus theta appears in the display window
Press the Axes button in the menu window A list of items appears in the selection area. Included is the item "Y Log : off"
Click on the "Y Log : off" option in the selection area The option changes to "Y Log : +ve". The plot is redrawn in the display window using a positive log format for the Y axis
Click on the "Y Log : +ve" option in the selection area The option changes to "Y Log : -ve". The plot is redrawn in the display window using a negative log format for the Y axis Note : You can invert the Y axis if desired by pressing the "Y Invert :" option listed in the selection area
The Zoom function button is used to zoom in or out of any part of a plot. It can be driven by the mouse or by manually typing in data bounds in the selection area. When in Zoom mode the button label changes to Zoom Out.
7.4.10
The Zoom button
Example 14 The user wants to zoom in on a part of a plot using the mouse
Generate a data plot in the display window Press the Zoom button in the menu window The button label changes to Zoom Out and the mouse cursor changes to a cross-hair. The maximum and minimum values for the x and y axes in the active plot frame are listed in the selection area
Move the mouse cursor to the display window. Position the centroid of the cross-hair cursor in the upper left-hand corner of the area to be zoomed in on. Press the mouse button and, keeping it depressed, drag the cursor down to the lower right-hand corner of the zoom area. Then release the mouse button As you drag the mouse across the screen a white frame box grows over the zoom area. When the mouse button is released the plot is redrawn in the display window focussing in on the zoom area. Note that the new plot frame does not correspond exactly to that selected with the mouse; this is due to rounding off errors used in the zoom algorithm
Example 15 The user wants to change the maximum x axis value of a plot by manually ascribing a new value.
Generate a data plot in the display window Press the Zoom button in the menu window The button label changes to Zoom Out and the mouse cursor changes to a cross-hair. The maximum and minimum values for the x and y axes in the active plot frame are listed in the selection area
Select the "X Maximum : " option from the selection area The message "Enter X Maximum : " appears in the selection area above the current maximum value on the x axis
Delete the old value using the backspace key then enter the desired value by typing it in the selection area. Press <Return> when finished The plot is redrawn in the display window using the new maximum x value
| Take me out of frames | Chapter 7 continued....... |