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-.. graph_help.rst
-
-.. This is a port of the original SasView html help file to ReSTructured text
-.. by S King, ISIS, during SasView CodeCamp-III in Feb 2015.
-
-.. |delta| unicode:: U+03B4
-.. |phi| unicode:: U+03C6
-
-
-Plotting Data/Models
-====================
-
-SasView generates three different types of graph window: one that displays *1D data*
-(ie, I(Q) vs Q), one that displays *1D residuals* (ie, the difference between the
-experimental data and the theory at the same Q values), and *2D color maps*.
-
-Graph window options
---------------------
-
-.. _Invoking_the_graph_menu:
-
-Invoking the graph menu
-^^^^^^^^^^^^^^^^^^^^^^^
-
-To invoke the *Graph Menu* simply right-click on a data/theory plot, or click 
-the *Graph Menu* (bullet list) icon in the toolbar at the bottom of the plot. 
-Then select a menu item.
-
-How to Hide-Show-Delete a graph
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-To expand a plot window, click the *Maximise* (square) icon in the top-right 
-corner.
-
-To shrink a plot window, click the *Restore down* (square-on-square) icon in 
-the top-right corner.
-
-To hide a plot, click the *Minimise* (-) icon in the top-right corner of the 
-plot window.
-
-To show a hidden plot, select the *Restore up* (square-on-square) icon on the 
-minimised window.
-
-To delete a plot, click the *Close* (x) icon in the top-right corner of the 
-plot window.
-
-*NOTE! If a residuals graph (when fitting data) is hidden, it will not show up 
-after computation.*
-
-Dragging a plot
-^^^^^^^^^^^^^^^
-
-Select the *Pan* (crossed arrows) icon in the toolbar at the bottom of the plot 
-to activate this option. Move the mouse pointer to the plot. It will change to 
-a hand. Then left-click and drag the plot around. The axis values will adjust 
-accordingly.
- 
-To disable dragging mode, unselect the *crossed arrows* icon on the toolbar.
-
-Zooming In-Out on a plot
-^^^^^^^^^^^^^^^^^^^^^^^^
-
-Select the *Zoom* (magnifying glass) button in the toolbar at the bottom of 
-the plot to activate this option. Move the mouse pointer to the plot. It will 
-change to a cross-hair. Then left-click and drag the pointer around to generate 
-a region of interest. Release the mouse button to generate the new view.
-
-To disable zoom mode, unselect the *Zoom* button on the toolbar.
-
-After zooming in on a a region, the *left arrow* or *right arrow* buttons on 
-the toolbar will switch between recent views.
-
-*NOTE! If a wheel mouse is available scrolling the wheel will zoom in/out 
-on the current plot (changing both axes). Alternatively, point at the numbers 
-on one axis and scroll the wheel to zoom in/out on just that axis.*
-
-To return to the original view of the data, click the the *Reset* (home) icon 
-in the toolbar at the bottom of the plot (see Resetting_the_graph_ for further details).
-
-Saving a plot image
-^^^^^^^^^^^^^^^^^^^
-
-To save the current plot as an image file, right click on the plot to bring up 
-the *Graph Menu* (see Invoking_the_graph_menu_) and select *Save Image*.
-Alternatively, click on the *Save* (floppy disk) icon in the toolbar at the 
-bottom of the plot.
- 
-A dialog window will open. Select a folder, enter a filename, choose an output 
-image type, and click *Save*.
-
-The currently supported image types are:
-
-*  EPS (encapsulated postscript)
-*  EMF (enhanced metafile)
-*  JPG/JPEG (joint photographics experts group)
-*  PDF (portable documant format)
-*  PNG (portable network graphics)
-*  PS (postscript)
-*  RAW/RGBA (bitmap)
-*  SVG/SVGA (scalable vector graphics)
-*  TIF/TIFF (tagged iamge file)
-
-Printing a plot
-^^^^^^^^^^^^^^^
-
-To send the current plot to a printer, click on the *Print* (printer) icon in 
-the toolbar at the bottom of the plot.
-
-.. _Resetting_the_graph:
-
-Resetting the graph
-^^^^^^^^^^^^^^^^^^^
-
-To reset the axis range of a graph to its initial values select *Reset Graph 
-Range* on the *Graph Menu* (see Invoking_the_graph_menu_). Alternatively, use
-the *Reset* (home) icon in the toolbar at the bottom of the plot.
-
-Modifying the graph
-^^^^^^^^^^^^^^^^^^^
-
-From the *Graph Menu* (see Invoking_the_graph_menu_) it is also possible to
-make some custom modifications to plots, including:
-
-*  changing the plot window title
-*  changing the axis legend locations
-*  changing the axis legend label text
-*  changing the axis legend label units
-*  changing the axis legend label font & font colour
-*  adding/removing a text string
-*  adding a grid overlay
-
-Changing scales
-^^^^^^^^^^^^^^^
-
-This menu option is only available with 1D data.
-
-From the *Graph Menu* (see Invoking_the_graph_menu_) select *Change Scale*. A
-dialog window will appear in which it is possible to choose different 
-transformations of the x (usually Q) or y (usually I(Q)) axes, including:
-
-*  x, x^2, x^4, ln(x), log10(x), log10(x^4)
-*  y, 1/y, ln(y), y^2, y.(x^4), 1/sqrt(y),
-*  log10(y), ln(y.x), ln(y.x^2), ln(y.x^4), log10(y.x^4)
- 
-A *View* option includes short-cuts to common SAS transformations, such as:
-
-*  linear
-*  Guinier
-*  X-sectional Guinier
-*  Porod
-*  Kratky
-
-For properly corrected and scaled data, these SAS transformations can be used 
-to estimate, for example, Rg, rod diameter, or SANS incoherent background 
-levels, via a linear fit (see Making_a_linear_fit_).
-
-Toggling scales
-^^^^^^^^^^^^^^^
-
-This menu option is only available with 2D data.
-
-From the *Graph Menu* (see Invoking_the_graph_menu_) select *Toggle Linear/Log
-Scale* to switch between a linear to log intensity scale. The type of scale 
-selected is written alongside the colour scale.
-
-2D color maps
-^^^^^^^^^^^^^
-
-This menu option is only available with 2D data.
-
-From the *Graph Menu* (see Invoking_the_graph_menu_) select *2D Color Map* to
-choose a different color scale for the image and/or change the maximum or 
-minimum limits of the scale.
-
-Getting data coordinates
-^^^^^^^^^^^^^^^^^^^^^^^^
-
-Clicking anywhere in the plot window will cause the current coordinates to be 
-displayed in the status bar at the very bottom-left of the SasView window.
- 
-.. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
-
-Dataset menu options
---------------------
-
-.. _Invoking_the_dataset_menu:
-
-Invoking the dataset menu
-^^^^^^^^^^^^^^^^^^^^^^^^^
-
-From the *Graph Menu* (see Invoking_the_graph_menu_) highlight a plotted
-dataset.
-
-Getting data info
-^^^^^^^^^^^^^^^^^
-
-In the *Dataset Menu* (see Invoking_the_dataset_menu_), highlight a data set
-and select *DataInfo* to bring up a data information dialog panel for that 
-data set.
-
-Saving data
-^^^^^^^^^^^
-
-In the *Dataset Menu* (see Invoking_the_dataset_menu_), select *Save Points as
-a File* (if 1D data) or *Save as a file(DAT)* (if 2D data). A save dialog will 
-appear.
-
-1D data can be saved in either ASCII text (.TXT) or CanSAS/SASXML (.XML) 
-formats (see :ref:`Formats`).
-
-2D data can only be saved in the NIST 2D format (.DAT) (see :ref:`Formats`).
-
-.. _Making_a_linear_fit:
-
-Making a linear fit
-^^^^^^^^^^^^^^^^^^^
-
-Linear fit performs a simple ( y(x)=ax+b ) linear fit within the plot window.
-
-In the *Dataset Menu* (see Invoking_the_dataset_menu_), select *Linear Fit*. A
-fitting dialog will appear. Set some initial parameters and data limits and 
-click *Fit*. The fitted parameter values are displayed and the resulting line 
-calculated from them is added to the plot. 
-
-This option is most useful for performing simple Guinier, XS Guinier, and
-Porod type analyses, for example, to estimate Rg, a rod diameter, or incoherent 
-background level, respectively.
-
-The following figure shows an example of a Guinier analysis using this option
-
-.. image:: guinier_fit.png
-
-Removing data from the plot
-^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-In the *Dataset Menu* (see Invoking_the_dataset_menu_), select *Remove*. The
-selected data will be removed from the plot.
-
-*NOTE! This action cannot be undone.*
-
-Show-Hide error bars
-^^^^^^^^^^^^^^^^^^^^
-
-In the *Dataset Menu* (see Invoking_the_dataset_menu_), select *Show Error Bar*
-or *Hide Error Bar* to switch between showing/hiding the errors associated 
-with the chosen dataset. 
-
-Modify plot properties
-^^^^^^^^^^^^^^^^^^^^^^
-
-In the *Dataset Menu* (see Invoking_the_dataset_menu_), select *Modify Plot
-Property* to change the size, color, or shape of the displayed marker for the 
-chosen dataset, or to change the dataset label that appears on the plot.
-
-.. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
-
-2D data averaging
------------------
-
-Purpose
-^^^^^^^
-
-This feature is only available with 2D data.
-
-2D data averaging allows you to perform different types of averages on your 
-data. The region to be averaged is displayed in the plot window and its limits 
-can be modified by dragging the boundaries around.
-
-How to average
-^^^^^^^^^^^^^^
-
-In the *Dataset Menu* (see Invoking_the_dataset_menu_), select one of the
-following averages
-
-*  Perform Circular Average
-*  Sector [Q view]
-*  Annulus [Phi view]
-*  Box sum
-*  Box averaging in Qx
-*  Box averaging on Qy
-
-A 'slicer' will appear (except for *Perform Circular Average*) in the plot that 
-you can drag by clicking on a slicer's handle. When the handle is highlighted 
-in red, it means that the slicer can move/change size.
-
-*NOTE! The slicer size will reset if you try to select a region greater than 
-the size of the data.*
-
-Alternatively, once a 'slicer' is active you can also select the region to 
-average by bringing back the *Dataset Menu* and selecting *Edit Slicer 
-Parameters*. A dialog window will appear in which you can enter values to 
-define a region or select the number of points to plot (*nbins*).
-
-A separate plot window will also have appeared, displaying the requested 
-average.
-
-*NOTE! The displayed average only updates when input focus is moved back to 
-that window; ie, when the mouse pointer is moved onto that plot.*
-
-Selecting *Box Sum* automatically brings up the 'Slicer Parameters' dialog in 
-order to display the average numerically, rather than graphically.
-
-To remove a 'slicer', bring back the *Dataset menu* and select *Clear Slicer*.
-
-Unmasked circular average
-^^^^^^^^^^^^^^^^^^^^^^^^^
-
-This operation will perform an average in constant Q-rings around the (x,y) 
-pixel location of the beam center.
-
-Masked circular average
-^^^^^^^^^^^^^^^^^^^^^^^
-
-This operation is the same as 'Unmasked Circular Average' except that any 
-masked region is excluded.
-
-Sector average [Q View]
-^^^^^^^^^^^^^^^^^^^^^^^
-
-This operation averages in constant Q-arcs.
-
-The width of the sector is specified in degrees (+/- |delta|\|phi|\) each side 
-of the central angle (|phi|\).
-
-Annular average [|phi| View]
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-This operation performs an average between two Q-values centered on (0,0), 
-and averaged over a specified number of pixels.
-
-The data is returned as a function of angle (|phi|\) in degrees with zero 
-degrees at the 3 O'clock position.
-
-Box sum
-^^^^^^^
-
-This operation performs a sum of counts in a 2D region of interest.
-
-When editing the slicer parameters, the user can enter the length and the width 
-the rectangular slicer and the coordinates of the center of the rectangle.
-
-Box Averaging in Qx
-^^^^^^^^^^^^^^^^^^^
-
-This operation computes an average I(Qx) for the region of interest.
-
-When editing the slicer parameters, the user can control the length and the 
-width the rectangular slicer. The averaged output is calculated from constant 
-bins with rectangular shape. The resultant Q values are nominal values, that 
-is, the central value of each bin on the x-axis.
-
-Box Averaging in Qy
-^^^^^^^^^^^^^^^^^^^
-
-This operation computes an average I(Qy) for the region of interest.
-
-When editing the slicer parameters, the user can control the length and the 
-width the rectangular slicer. The averaged output is calculated from constant 
-bins with rectangular shape. The resultant Q values are nominal values, that 
-is, the central value of each bin on the x-axis.
-
-.. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
-
-.. note::  This help document was last changed by Steve King, 01May2015
