1 / 27

CAD Software and Hardware

CAD Software and Hardware. Mr.E.S.Agrawal SGGSIE&T, Nanded. ICG (Interactive C omputer Graphics). ICG denotes a user oriented system. User CRT ICG magnifies the power of designer. CAD Software/Graphics software(GS). Set of programs Rules for development of GS: Simplicity Consistency

tomai
Download Presentation

CAD Software and Hardware

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CAD Software and Hardware Mr.E.S.Agrawal SGGSIE&T, Nanded

  2. ICG (Interactive Computer Graphics) ICG denotes a user oriented system. User CRT ICG magnifies the power of designer. SGGS Institute of engineering and Technology Nanded

  3. CAD Software/Graphics software(GS) Set of programs Rules for development of GS: Simplicity Consistency Completeness Robustness Performance Economy SGGS Institute of engineering and Technology Nanded

  4. Configuration Design workstation Graphics Terminal Application Database Application Program Graphics Package I/P Devices SGGS Institute of engineering and Technology Nanded

  5. Functions of GS Generation of Graphics element Transformations Display control and windowing function Segmenting function User input functions SGGS Institute of engineering and Technology Nanded

  6. Generation of Graphics element Graphic elements Primitives SGGS Institute of engineering and Technology Nanded

  7. Transformations Scaling Translation Rotation Reflection SGGS Institute of engineering and Technology Nanded

  8. Display control and windowing function Visualization Windowing Hidden line removal SGGS Institute of engineering and Technology Nanded

  9. Segmenting function Segment Storage type CRT SGGS Institute of engineering and Technology Nanded

  10. User input functions To enter commands User-friendly SGGS Institute of engineering and Technology Nanded

  11. Hardware Secondary storage Design workstation CPU Graphics Terminal Input Devices O/P Devices SGGS Institute of engineering and Technology Nanded

  12. Design workstation • System Interface • Functions • Interface with CPU • Steady Graphic Image • Provide digital description of the graphic image • Translate computer commands • Communication SGGS Institute of engineering and Technology Nanded

  13. Graphics Terminal (GT) • GT is an important component of CAD providing a window through which the communication with the computer can be realized. • Graphics terminals are classified as • CRT • Flat Screen SGGS Institute of engineering and Technology Nanded

  14. Graphics Terminal (GT) • Two basic image generation Techniques. • Stroke Writing Random positioning Line drawing Vector writing • Uses an electron beam which operates like pencil. • The image is constructed out of a sequence of straight line segment. SGGS Institute of engineering and Technology Nanded

  15. Stroke Writing Smooth curves can be created. SGGS Institute of engineering and Technology Nanded

  16. Raster Scan The viewing screen is divided into a large no of discrete phosphor elements. Matrix of pixels constitute a raster. 256X256, 1024X1024. SGGS Institute of engineering and Technology Nanded

  17. Raster Scan Each pixel on screen can be made to glow with a different brightness. Color screen provide for the pixels to have different color as well as brightness. SGGS Institute of engineering and Technology Nanded

  18. Raster Scan The electron beam creates image by sweeping along horizontal line. Sweeping is from left to right. Pixels are energized during sweep. When sweep on one line is completed, the electron beam moves to next line below. SGGS Institute of engineering and Technology Nanded

  19. Raster Scan After sweeping entire screen the process is repeated. Rate of entire scan of screen is 30 to 60 scan per sec. SGGS Institute of engineering and Technology Nanded

  20. Graphics Terminal Direct Beam Refresh Direct View storage tube (DVST) Raster scan (Digital TV) SGGS Institute of engineering and Technology Nanded

  21. Direct Beam Refresh Uses stroke writing approach Refresh Easy to provide animation SGGS Institute of engineering and Technology Nanded

  22. Direct View storage tube (DVST) Stroke writing approach Storage tube Flicker free No Trim Low cost SGGS Institute of engineering and Technology Nanded

  23. Raster scan (Digital TV) Uses Raster Scan Approach Frame/Refresh Buffer High Cost SGGS Institute of engineering and Technology Nanded

  24. Input Devices Cursor control devices Digitizers Alphanumeric and other key board terminals Graphical interaction with System SGGS Institute of engineering and Technology Nanded

  25. Cursor control devices Cursor normally takes the bright spot on CRT Thumbwheel Direction Key/Key board Terminal Joysticks Tracker Ball Light Pen Electronic tablet SGGS Institute of engineering and Technology Nanded

  26. SGGS Institute of engineering and Technology Nanded

  27. Plotters and O/P Devices Pen Plotters Hard copy Unit Electrostatic Plotters Computer output to micro film units SGGS Institute of engineering and Technology Nanded

More Related