GEOS SDK TechDocs
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1 Ruler Features
The ruler library provides objects that act as rulers. These rulers may be linked up with a GenView object so that when the user scrolls around within the GenView, the rulers update accordingly. The rulers work with a variety of measurement systems and also provide grids and guidelines to help the user to figure out the spacial layout of a graphic space. To aid the user's mouse movement, the rulers can constrain the mouse's movement to certain lines.
To work with the basic ruler set-up, you don't need to know much about GEOS other than the basics of objects and messaging. However, for certain customizations, you will probably need to know something about GenViews and notifications they pass on to linked objects.
1 Ruler Features
2 Ruler Setup
3 VisRuler Instance Data
4 Managing Rulers
4.1 RulerShowControl
4.2 Mouse Tracking
4.3 Grid Spacing and Constraint
4.4 Guide Constraints and Guidelines
4.5 Other Mouse Constraints
4.6 Esoteric Messages
GEOS SDK TechDocs
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| 1 Ruler Features