source: sasview/src/sas/guiframe/media/graph_help.rst @ e6e4af7

.. 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.

Plotting Data/Models
====================

Graph_Menu_

2D_Data_Averaging_

Key_Sequences_

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.. _Graph_Menu:

Graph Menu
----------

Invoking_the_Graph_Menu_

Reset_Graph_

Hide_Show_Delete_Graph_

Data_Info_

Save_Plot_Image_

Save_Data_

Drag_Plot_

Zoom_In_Out_

Remove_Data_from_Plot_

Change_Scale_

Linear_Fit_

Other_Graph_Modifications_

.. _Invoking_the_Graph_Menu:

Introduction
------------

Locating the pointer and right-clicking on a data/theory plot will bring a 
context menu. On the menu, select a menu item.

.. _Reset_Graph:

Reset Graph
-----------

To reset the graph's axis range, right click on the plot and the context menu 
pops-up. Select *Reset Graph*  and the plot will take its initial range. Also 
the 'home' icon in tool bar will do the same.

.. _Hide_Show_Delete_Graph:

Hide/Show/Delete Graph
----------------------

To Hide, click the Hide (bar) button in the tool bar.To Show, select the the 
'Show' menu item in the 'Graph' menu in the menu bar.To Delete, click the 'x' 
button in the title bar.

Note: If a residuals graph (in Fitting) is hidden, it will not show up after 
computation.

.. _Data_Info:

Data Info
---------

From the context menu, select 'Data Info' to see the data information dialog
panel.

.. _Save_Plot_Image:

Save Plot Image
---------------

Right click on plot. Context menu will pop-up select save image [file name].
A dialog window opens and write a the name of the file to save and click on 
*Save Image.*

.. _Save_Data:

Save Data
---------

From the context menu, select 'Save points as a file' for 1D, or 'Save as a 
file(DAT)' for 2D. Note that two formats, txt and xml, are available in 1D 
saving.

.. _Drag_Plot:

Drag Plot
---------

Select the *crossed arrows*  button on the plot panel *toolbar*  to drag the 
plot. To disable dragging mode, unselect the same button on the toolbar.

.. _Zoom_In_Out:

Zoom In/Out
-----------

Select the *rectangle*  button on the plot panel *toolbar*  to zoom in a
region of the plot.

To disable zoom mode, unselect the same button on the toolbar. After zoom in
a region, select *left arrow*  or *right arrow*  button on the toolbar to set
the graph the the previous size. If a mouse wheel button is available,
*zoom in/out*  by scrolling the mouse wheel (see Key_Sequences_ help for
details).

.. _Remove_Data_from_Plot:

Remove Data from Plot
---------------------

Highlight the plot and the context menu appears.Select *remove [file name]*.
The plot selected will disappear.

.. _Change_Scale:

Change Scale
------------

If the loaded data is a 1-D data changing scale or data representation will 
work as follows. *Right click* on the plot window. A context menu pops-up and 
select *Change Scale* . A dialog window titled *select the scale of the graph* 
will pop-up then change the *x* , the *y*  and the *view*  values as wish.

The 'view' option includes the axis scale short-cuts such as Linear, Guinier, 
Cross-sectional (XC) Guinier, and Porod plot scale. For a proper data set, 
these axis scales can be used to estimate Rg, Rod diameter, or Background of 
neutron scattering data respectively (via 'Linear Fit'; see below). For a 2D 
image, *Right click*  on the image to pop-up the context menu. Select to 
switch from linear to log scale. The scale selected is printed on the status 
bar.

If the loaded data is an image. *Right click*  on the image to pop-up the
context menu. Select to switch from linear to log scale. The scale selected is
printed on the status bar.

.. _Linear_Fit:

Linear Fit
----------

Linear fit is to perform a line model fitting keeping the scale of the plot.
Highlight data to fit. From the context menu select *Linear Fit* . A dialog
window appears. Change model initial parameters, data limits and hit *fit*
button. New parameters values are displayed and the line with the new
parameters is added to the plot. Especially for Guinier, XC Guinier, and
Porod plot scale, this 'Linear Fit' will provides Rg, Rod diameter, and
background, respectively. The following figure shows an example for the
Guinier scale.

.. image:: guinier_fit.png

.. _Other_Graph_Modifications:

Other Graph Modifications
-------------------------

Some custom modifications of the symbols, text, axis, etc of the graph are 
provided.

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.. _2D_Data_Averaging:

2D Data Averaging
-----------------

Principle_

How_to_Average_

Available_Averagings_

Unmasked_Circular_Average_

Masked_Circular_Average_

Sector_Average_

Annular_Average_

Box_Sum_

Box_Averaging_in_Qx_

Box_Averaging_in_Qy_

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.. Principle: 

Principle
---------

This feature allows you to perform different types of averages on your data, 
and allows you to see what regions of the detector will contribute to the 
average. The region to be averaged will be drown and can be modified by 
dragging the lines around.

.. _How_to_Average:

How to Average
--------------

Right click on 2D data for the context menu to appear. Select one type of 
averages among *"sector [Q view]", "Annulus [Phi view]", "Box sum", "Box 
averaging in Qx ", "box averaging on Qy","Perform circular Average".*

A slicer will appear except for *"Perform circular Average"*  that you can 
drag by clicking on a slicer 's marker. When the marker is highlighted in red, 
it means that the slicer can change size.You can also move some of the slicer 
by simply drag its side when highlighted in red. the slicer size will be reset 
to its previous size if the user try to select a region greater than the size 
of the data.

The user can also select a region to average when a slicer has been selected 
already by *right clicking*  on the context menu and selecting *Edit Slicer 
Parameters* . The dialog window will appears and the user can enter values to 
selected a region or selected numbers of points to plot *nbins* .

For *Box sum* , when the user selects this option, a new panel is created 
containing the result of average of the sum of every pixels contains on that 
data.The user can also enter values to select a region.

.. _Available_Averagings:

Available Averagings
--------------------

Some different types of averaging are provided for.

.. _Unmasked_Circular_Average:

Unmasked Circular Average
-------------------------

This operation will perform and average in constant q-rings around the (x,y) pixel
location of the beam center.

.. _Masked_Circular_Average:

Masked Circular Average
-----------------------

This operation is same as 'Masked Circular Average' except that the masked
region is excluded if masked.

.. _Sector_Average:

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:

Annular Average [Phi View]
--------------------------

It performs an average between two q-values centered in (0,0), and averaged 
over a width of a specified number of pixels. The data is returned as a 
function of angle (phi) in degrees. Moving one circle of this slicer to 
radius of zero corresponding to a circular averaging on radius qmax , the 
outer circle. The angle zero starts from the positive x-axis direction.

.. _Box_Sum:

Box Sum
-------

Perform the sum of counts in a 2D region of interest.When editing the slicer, 
the user can enter the length and the width the rectangle slicer and the 
coordinates of the center of this rectangle.

.. _Box_Averaging_in_Qx:

Box Averaging in Qx
-------------------

Computes average I(Qx) for a region of interest. When editing the slicer, the 
user can control the length and the width the rectangle slicer. The averaged 
output is calculated from the constant bins with rectangular shape. The 
resultant q values are nominal values, i.e., the central values of each bins 
on the x-axis.

.. _Box_Averaging_in_Qy:

Box Averaging in Qy
-------------------

Computes average I(Qy) for a region of interest.When editing the slicer, the 
user can control the length and the width the rectangle slicer. The averaged 
output is calculated from the constant bins with rectangular shape. The 
resultant q values are nominal values, i.e., the central values of each bins 
on the y-axis.

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.. _Key_Sequences:

Key Sequences
-------------

Floating_Panel_

Context_Menu_

Zoom_

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.. _Floating_Panel:

Floating Panel
--------------

For a graph panel to float on the top of the SV window:

Press the *Ctrl(Cmd on MAC) key*  on dragging and placing a panel. Or if you 
want to make all plot panels float, select 'Float' from Graph/Preperences in 
the menu bar. Otherwise choose 'Dock'.

.. _Context_Menu:

Graph Context Menu
------------------

To get the graph context menu to print, copy, save data, (2D)average, etc, 
*locate the mouse point on the plot to highlight and *(Mouse) Right Click* 
to bring up the full menu.

.. _Zoom:

Zoom In/Out
-----------

To Zoom in or out the full plot, *locate the mouse point inside the graph 
which will be the center of the zooming, then *rotate MouseWheel*.

*To Zoom in or out the plot in x or y direction, *locate (and click) the 
mouse point near x (or y) axis just outside of the graph and then *rotate 
MouseWheel* .* Note that this works only on the 1D plots.