Introduction
Example of a scene with axes, annotation and scalebar
Geographical grids, axes annotation, scalebars and text are natural display features when working out displays and presentation graphics. This chapter gives a brief documentation of the standard menus for text and annotation graphics in the system.
Geographical coordinates with axes
Use the command Geographical coordinates to display axes and coordinate annotation on a dataset.
Geographical coordinates can be accessed as a command (found in Shared Commands > Visualization) or as a stand alone menu from Tools > Geographical Management. In either case the rules for a correct display is the same.
- Push Default display under Default display to see the default values.
- Type in Longitude/Latitude start, Long/Lat increment and Longitude/Latitude stop values to set a custom geographical grid.
- Push Display or Execute to display geographical coordinates using the Lat / Lon values.
- To get a nice placement of the annotation numbers use the tuning in Adjust annotation numbers.
Sometimes it may be useful to create an item command that will save your settings for a specific dataset. This will save you time next time you want to display axes over the same area. Read more about creating item commands.
Scale bar
To display a scale bar open Tools > Scalebar display
- Push Draw Scalebar to display the scalebar in default position and appearance.
- To place the scalebar at specific position:
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- Set the screen in 2D mode.
- Tick the box Use XYZ coordinates
- Click in the graphic window where you want to place the scalebar.
- Click Update cursor to world coordinates to get the cursor coordinates.
- Redisplay scalebar by pushing Draw Scalebar
Text annotation
The Three dimensional text command lets you create text annotation anywhere in the graphical window. You can create 2D or 3D text, display the text in any angle or stick the text to a surface. All these things can be found out whith a little test and trying. When everything is fine save the command object. Optionally save it as an Item command or copy a present CO so you work with and save a copy of the command object.
As an example here are the guide lines for drawing a text at an angle along a line.
Guide lines for text annotation at an angle
- Write in the desired text in the text field.
- Set the screen in 2D mode and make two cursor positions:
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- First cursor position: at end of text
- Second cursor position: at start of text
- If the screen is in 3D mode use y to attach the cursor point to a surface.
- Push Update cursor to coordinates.
- Push Update dip and azimuth. Azimuth is for rotation around z axes. Dip is for 3D mode.
- Check in the Dip and Azimuth boxes.
- Select text attributes.
- Push Execute to display the text.
With a little training one can place text at any angle and position.
Example map with geo grid, scale bar end 3D text