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SurView TutorialGRX legend windows |
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There are several types of GRX legend windows:
![]() vertical grid legend |
![]() horizontal grid legend |
This is a vertical bar showing the range of colours
for a composite image created from 2 images.
This is triangle showing the range of colours for a
composite image created from 3 images.
This is a .BMP bitmap image of anything the data preparer
wishes to show instead of the usual legend.
The data preparer can specify 'no legend' if desired.
In this case, the View | Grid legend menu item is disabled.
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The grid legend window can be set up to be initially visible or hidden. The visibility of the window can be toggled using the View | Grid legend menu item. The data preparer can also specify 'no legend' if there is little or no useful information, in which case the menu item will be disabled.
A visible GRX legend window may be closed or minimized.
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Legend windows can be moved around the screen like any other window, by dragging on the caption area at the top. Legend windows are special windows and can also be moved by dragging on any part of the interior window surface (i.e. anywhere in the legend) with the left mouse button held down. This allows you to push the window almost offscreen and still be able to move it back by dragging any part of it.
Of course, if it's really in the way, you can minimize or close the window too.
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Each legend window can be resized and placed anywhere on the map. GRX legend windows are smart and can resize the contents to match the size of the window.
Legend for 1 variable
If you make the window wider or narrower, all you do
is show more or less of the legend.
If the width is greater than the height, the layout automatically switches from a vertical bar to a horizontal bar.
If you make the window taller or shorter, the contents are resized to fit. Everything inside the window is scaled relative to the height of the cell. So if the window is made taller, the cell height increases and so does the height of the cell and the text. That increases the width of the legend, so the window will have to made wider to see it all.
Legend for 2 or 3 variable composite images
The resizing is the same as above, except that the aspect ratio
of the window does not change the layout of the window.
Bitmap legend
These legend windows can NOT be resized.
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As the cursor floats over the legend window background (not the cells),
it will show the setup cursor
(yes, it's a wrench and a black right mouse button). When the cursor appears,
you can right click to bring up the configuration dialog box.
Note: there is no setup dialog box for 'bitmap' legends.
![]() grid legend setup for 1 variable |
![]() grid legend setup for binary composite |
![]() grid legend setup for ternary |
These dialog boxes allow you customize the appearance of the legend. The main thing to remember is that every measurement is expressed in terms of the height of the legend cell (single variable legend) or total height of the bar or triangle (2 or 3 variable composite legends).
Note that the ASX legend window configuration dialog box provides access to both the geometry of the legend and the display attributes of the data. However, the GRX configuration dialog box provides access only to the legend geometry. Use Edit | Display attributes... to access the display attributes of the grid/image.
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The legend windows are drawn in the same location, size and shape relative to the map, as they are on the screen (but they won't show in the cartoon image in the printing dialog box). If there isn't a good unused open area in which to place the legend, you can move the map over to the side using the zoom/pan cursor and then resize and locate the legend in a blank area. Keep in mind that the legend can be displayed as a vertical or horizontal bar.
No, you can't print the legend on a separate piece of paper, but it's on my 'to do' list.
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