Drawing Area

This is the area where any kind of data (image, road map, altimetric map etc.) is presented. It is the SPRING main menu itself, as well as the other visualization windows, and even the contrast dialog box.

The visualization windows or drawing areas are controlled in the Control Panel or in the bottom of the window, as well as its presence in the working area and the data that is being presented. Next it will be described the facilities of this windows.

Footnote - just below the drawing area, the footnote presents a message to the right, indicating which is the active Information Layer, that is, the IL that will receive an operation, even if this IL is not visualized in the window, and to the left it presents the cursor geographic coordinates, the windows and the buttons: float page, add windows, remove windows and replace pages on the tab bar.

See:
How to define presentation modes
How to see Geographic Data Positioning
How to Open (or View) and close a Drawing Area
How to Use a Zoom
How to Zoom In / Zoom Out / Zoom IL
How to Merge Windows?
About the Digitizer Cursor, Point and Graph Canvas!
The Draw, Previous Image and Reset resources in the Drawing Window!
How to get information of the IL displayed?
How to fly after a zoom (pan resource) ?


See also:
How to display data in the window?
How to see the caption in a thematic map?
Control Panel Resources

 

Using SPRING


How to define Presentation Modes

Auto/Full/Scale Mode

The IL presentation in the drawing area can be controlled by other parameters that are defined for each window. In the footnote of each window (unix.gif - 943 Bytes version) or the tools bar (windows.gif - 1353 Bytes version) there is an option button that allows the selection among: Auto, Full and Scale. See the effect of each of these options:

NOTE: When clicking on Execute - Reset or the atalho_recompor.gif - 981 Bytes button in the active window, the presentation mode returns to the Auto Mode.


 To change the presentation mode :

 

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To see the data geographic positioning

When a project is active and the cursor is moved over an opened drawing area, the geographical position of the cursor can be displayed, in planar or geographical coordinates. In order to get this feature, one should change the coordinate field that is in the “drop-down” listing box, to the right of the text scale box. The options are:

Disabled
This option disables the coordinates at the footnote area.

Planes
The coordinates are presented at the window footnote area, in meters.

Geographic
The coordinates are presented at the window footnote area, in degrees, minutes and seconds.

 To change the coordinate system:

 

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To open and close a drawing area

Not including the SPRING main menu, which is also a drawing area, it is possible to open or close other drawing areas (Auxiliary Displays, 2, 3, 4, ... n):

 To open a drawing area:

 Ways to close a drawing area:

To close a drawing area, one should select another drawing area, and the one that was active becomes inactive. It can also be done by clicking on the  “drop-down” listing box  in the Control Panel (if it is floating) or by clicking on the buttons (displays) at the lower left corner of the window.

 

WARNING : The Close button at Window 1 (Main Menu), closes the program.
* Opening a drawing area does not mean it is active.

 

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Using the Zoom in an active Window - Zoom Cursor

The Zoom Cursor is used to define regions that can be amplified in the drawing area. The zoom is enabled when this button is active,  and the mouse cursor has the shape of an arrow pointing to the right bottom corner,  for  and for , inside the drawing area. Two points are required to establish the zoom area, the upper left corner and the lower right corner.

The procedure to make a zoom needs 4 main steps:

Making a zoom in the drawing area:

NOTE: In order to disable the zoom cursor and go back to the normal mode, just click on the Zoom Cursor in the tools  bar  or [View] [Zoom Cursor], or use the middle right button (RB) inside the drawing area.

Once a zoom area is defined (dotted rectangle) this can be resized before the [Execute][Draw]. Click on any of the rectangle sidelines or the rectangle external diagonals. These allow resizing (see the eight possible positions in the figure below). A second click is required to anchor the new position.

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The marked zoom area can still be totally moved to another position, just click in the internal part of the defined rectangle, drag it to the desired position and click again to anchor it in a new position.

The zoom resource is very important when one wants to see an Information Layer in more details. For data in the raster format, the zoom does not make sense since it is possible to see the resolution elements (pixels). A vector data, however, will not loose its resolution, independently of the scale used.

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How to Zoom In / Zoom Out / Zoom IL

After presenting some data in any of the SPRING window, it is possible to ZOOM IN or to ZOOM OUT the data. It is possible to amplify (Zoom +) or reduce (Zoom -) once starting from the drawing center area. Another option is to draw the IL evolving rectangle exactly, which is previously defined.

Just click on one of the options:

The Zoom In  button or [Execute] [Zoom In] in the main menu amplify the area twice starting from the drawing area center after selecting the IL’s in the "Control Panel".

The Zoom Out   button or [Execute] [Zoom Out] in the main menu reduces the area twice starting from the drawing area center after selecting the IL’s in the "Control Panel".

The Zoom IL  button or [Execute] [Zoom IL] in the main menu amplify the data according to the active IL in the "Control Panel", based on the evolving rectangle in the IL. Other IL's can be selected, but the action will be on the active IL..

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Merging one window into another

Merging one SPRING window means to show its contents, that is, the IL's that are selected in the "Control Panel", in the main window, through a mobile window over the drawing area.

This window merging resource allows, easily, comparing the data from other IL's with the active and visible IL in the SPRING main window. The figure below shows the central part in main window, part of another merged window. See the following procedure.


 Attaching the data from a display with the main window:


NOTE: To add or remove displays, click on the icons + (add page) and - (remove page), located on the lower left corner of the footnote area.

NOTE: While the window is merged to the mouse movement, the user can use the mouse RB (right button) to hide and present quickly the merged windows contents. Keeping the RB pressed without moving the mouse, the merged area temporarily disappears.

The figure below shows an example of merged window, where there is an image in the Main Window and a thematic image merged in the Display 2 .

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Cross Cursor

The Cross Cursor is used for SPRING functions where it is required to get a specific position in the window, for instance, reading the gray levels of an image. To enable it click on View - Cross Cursor. The cursor keeps a cross (+) shape in the display, indicating that it is active. The cross cursor will be used in applications where the coordinate has to be indicated by window pointing. One click with the mouse right button disables the Cross Cursor.

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Digitizer Cursor

The Digitizer Cursor button is used when we want to make a vector data digitizing through the digitizer, and it only will be enable when a digitizer is connected and configured, through the environment variables SPRINGTABLEPORT and SPRINGTABLE (more details about this see the environment variables).


IMPORTANT : Do not forget to make the digitizer calibration before using it.


NOTE : When activating the Digitizer Cursor, the mouse will become disabled, allowing only the digitizer cursor movements. In order to return the control to the mouse, just click the button 4 in the digitizer cursor.

 

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Graphic

The Graphic button in the tools bar or View - Graphic is used to show some application's results in the graphic form, such as Profile Calculus and Lineaments analysis (not available in this version of SPRING).

 

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To Draw, Zoom In, Zoom Out, Zoom IL, Previous and Reset the display data

The Draw button or [Execute] [Draw] in the main menu updates the data in the window according to the selection performed in the "Control Panel" and the presentation characteristics, such as scale, defined in the window. It has to be activated at each new selection, after changing the visualization parameters, data edition, and after defining the zoom area with the cursor.

The Reset button or [Execute] [Reset] in the main menu resizes the data presentation as a function of the window size and of the rectangle around the active project. It will undo a zoom performed using the Zoom Cursor and restore the presentation mode to Auto, if the system was set to Full or Scale.

The Previous button or [Execute] [Previous] in the main menu restores the last presentation action of a data in the current window. It will undo the last zoom made through the Area Cursor, Zoom In, Zoom Out, Zoom IL or Flying Cursor.

 

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 Amplify the Drawing Area

Once there is one or more IL’s drawn in some of the displays, it is possible to amplify what you see through another window. On the tools bar, use the Amplify Button to increase 2, 4 or 8 times the data in the drawing area. Move the cursor over one of the displays and the cursor position will be amplified  according to the selected number (the figure below show the cursor position amplified 4 times).

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NOTE: This amplifying resource is very useful when one wishes to locate with greater precision the control points in an image registration process.

 

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Window Cursor

The Window Cursor is used when one wants to visualize, simultaneously, the images positioning in different displays. When clicking on the Window Cursor button in the active window, a cross (+) will appear in the other shown windows, indicating the position that corresponds to mouse position in the active window. The figure below shows an example in which the main window is the active one and the blue square represents the mouse position. Notice that in the Displays 2, 3 and 4, a cross indicates the mouse location referred to the main window.  

 

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To get information from the presented IL's in the display

The usage of the button or [View] [Info Cursor] in the main menu, allows to show all information about the presented IL's in the active window. When activating this button, the cursor changes to a cross (+) shape and when clicking in the active window, all information in the indicated position are presented in the "Data Report " window. To restore the cursor's shape (arrow), click on the info button again.

 

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How to fly after a zoom

The flying feature using the button or [View] [Roaming Cursor] in the main menu, allows to move the data in the window while keeping the visualization scale, and has only effect when the zoom is applied over the data in the active window. The cursor turns to the cross (+) shape when the flying feature is active. Click on a position in the window and drag the mouse until the desired position, releasing it after that, so the image will be presented in the new position. To restore the cursor to the arrow shape, click on the mouse right button inside the drawing area or the flying button itself.


 Flying in the window after the zoom:

 

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