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Interactive InputTechniques
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Interactive Input Techniques
Basic positioning methods
Constraints
Grids
Gravity fields
Rubber-band methods
Sketching
Dragging
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Positioning techniques
There are various techniques used for positioning.
Positioningmeans location, which is one of the basic
graphical input techniques.
For geometrical modelling, positioning is very important,
as the user frequently designs a new element of the model
or repositioning an existing one.
While working on the screen the position is used to insert a
symbol or to indicate the end point of a line or three points
on a curve.
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For positioning the desired spot on the screen , the cursor ortracking cross is moved to that location and then the
information is passed to the computer memory by pressing a
button or key.
There are positioning constraints which can be overcome by
using symbols guidelines, feedback and the use of rubber
band techniques.
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Basic positioning techniques
Used to specify a location for an object or a character
string The cursor is moved to the desired location.
A button is pressed to fix the object at this location.
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Used to draw lines
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Used to place the cursor at a predetermined position
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Constraints
Used to achieve predetermined orientations and
alignments
Common constraints
Horizontal alignment
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Vertical alignment
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Grids
Used to round coordinates positions to the nearest grid
intersection
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Useful for positioning and aligning objects and text
Grids can be displayed or invisible
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Gravity field
Used to connect a new line to a previously drawn line
Normally the gravity field is not displayed
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Rubber band Methods
Used to construct and position straight lines
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Used to construct circular arcs
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Used to scale objects
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Used to distort objects by allowing only the line
segments attached to a single vertex to change
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Sketching
Uses rubber-band methods to create objects consisting
of connected line segments
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Uses stroke techniques to create curved figures
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A variety of brushes can be provided
Different thicknesses
Different textures
Different colors (including background) Even patterns
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Dragging
Used to reposition objects
Select an object from the menu
Position the object
Release the objects
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