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Interactive Input Techniques

Interactive Input Techniques. Interactive Input Techniques Basic positioning methods Constraints Grids Gravity fields Rubber-band methods Sketching Dragging. Positioning techniques. There are various techniques used for positioning.

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Interactive Input Techniques

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  1. Interactive Input Techniques

  2. Interactive Input Techniques • Basic positioning methods • Constraints • Grids • Gravity fields • Rubber-band methods • Sketching • Dragging

  3. Positioning techniques • There are various techniques used for positioning. • Positioning means 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.

  4. Continue… • For positioning the desired spot on the screen , the cursor or tracking 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.

  5. 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.

  6. Continue… • Used to draw lines

  7. Continue… • Used to place the cursor at a predetermined position

  8. Constraints • Used to achieve predetermined orientations and alignments • Common constraints • Horizontal alignment

  9. Continue… • Vertical alignment

  10. Grids • Used to round coordinates positions to the nearest grid intersection

  11. Continue… • Useful for positioning and aligning objects and text • Grids can be displayed or invisible

  12. Gravity field • Used to connect a new line to a previously drawn line • Normally the gravity field is not displayed

  13. Rubber band Methods • Used to construct and position straight lines

  14. Continue… • Used to construct circular arcs

  15. Continue… • Used to scale objects

  16. Continue… • Used to distort objects by allowing only the line segments attached to a single vertex to change

  17. Sketching • Uses rubber-band methods to create objects consisting of connected line segments

  18. Continue… • Uses stroke techniques to create curved figures

  19. Continue… • A variety of brushes can be provided • Different thicknesses • Different textures • Different colors (including background) • Even patterns

  20. Dragging • Used to reposition objects • Select an object from the menu • Position the object • Release the objects

  21. Thank you

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