The main menu option "Subregion type" selects a subregion for the wire frame surface view, and for subsequent 1-d integration.
Select the main menu option "Subregion type", then select "Rectangle" from the
roll-out submenu which appears. Drag
the solid dot which appears at the image center with the middle mouse button,
to position a corner
of the rectangle.
The wire frame surface will be drawn when the middle mouse button is released.
The rectangle corner and center can be adjusted with the Tab and arrow keys, as described for the line and circle. The corner and center can also be moved by grabbing a movable (solid filled) dot with the mouse and dragging while holding down the middle mouse button.
Note that the support of the surface is always a grid of 71x71 points. Values at non-integer sample locations are interpolated (linearly in position, logarithmically in intensity). This grid is used for the surface display only; it is not the grid used for integrations.
Rectangular integration is controlled under the main menu entry "Integrations".
The small square is just like the rectangle, except that its initial size is exactly 71x71 pixels. Thus there is no interpolation in constructing the wire-frame surface over a small square: each node of the wire frame corresponds exactly to one pixel.
The small square retains this property when it is translated using the arrow keys with both reference points movable.
If a small square is repositioned in any other way, it will lose its special 71x71 pixel size, and a subsequent wire-frame surface will be made with interpolations of pixel values.
A small square of 71x71 pixels is also created when the zoom spot is moved using the list of marked points.
In the main menu, "Subregion type" "Sector" allows the user to specify an angular sector as the sampling region for the wire-frame surface view. Move the cursor to one corner of the sector, then press and hold down the middle mouse button, and drag the opposite corner of the sector. When the second corner is positioned, release the mouse button.
The wire frame surface will be drawn when the middle mouse button is released.
The sector corners can be adjusted with the Tab and arrow keys, as described for the line and circle.
Unlike the rectangle, sector corners can not be adjusted with the mouse. Each time the middle mouse button is pressed, a new sector is defined. Use the Tab and arrow keys to refine the position of sector corners
Again the support of the surface is always a grid of 71x71 points. Values at non-integer sample locations are interpolated (linearly in position, logarithmically in intensity). This grid is used for the surface display only; it is not used for integration.
An angular sector may have any opening between 0 and 360 degrees. To get a small-angle sector, create the sector by dragging clockwise. To quickly create a large-angle sector, create it by dragging counter-clockwise.
The center point for an angular sector is by default the center of the image. To redefine the center of image, see the option "New Center of Image" in the "Zoom Options" menu.
Sector integration is controlled under the main menu entry "Integrations".
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