pointing device in computer graphics.pptx

pointing device in computer graphics

1. P o i n t i ng D ev i ces & positioning devices

2. Definition Pointing Devices are hardware input devices used to control the cursor on computer screen. It is a device through which we can control the movement of pointer to select the items on screen.

3. These devices are used to control the movement of the cursor or interact with graphical interfaces, catering to a variety of needs in computing, gaming, design, and virtual environments . Pointing and positioning devices are input devices that allow users to control the position of a cursor or pointer on a screen or to interact with the computer's graphical user interface.

4. Pointing and Positioning Devices: Mouse Touchpad ( Trackpad ) Trackball Stylus Joystick Graphics Tablet (Digitizer Tablet) Light Pen Touchscreen TrackPoint (Pointing Stick) 3D Mouse Game Controller Motion Sensors (e.g., Microsoft Kinect) SpaceMouse Foot Mouse Eye-Tracking Devices Leap Motion Controller VR Controllers

5. P o i n t er I t is a s m a ll s y m b o l t h a t a pp e a r s o n the screen .

6. P o i n ti n g Devices A pointing Device can be used to select text, graphics and other objects such as: Buttons Icons Menu Commands

7. T y p e s o f Pointing Devices Mouse Trackball Pointing Stick Touchpad OR Trackpad

8. M ou s e It is a device that control the movement of cursor or pointer on display screen. As we move the mouse, the cursor on display screen moves in the same direction . Type : Handheld device

9. Types of Mouse Mechanical Mouse Optical Mouse Air Mouse Touch Mouse Wireless OR Cordless Mouse

10. Mechanical Mouse A mechanical mouse is a computer mouse that contains a metal or rubber ball on its lower side. When the ball is rolled in any direction, sensors inside the mouse detect this motion and move the on-screen mouse pointer in the same direction.

11. Optical Mouse An optical mouse is a computer mouse which uses a light source, typically a light-emitting diode. It contains no ball inside it. I t i s m o r e expe n s i v e t h e n mechanical mouse . LED Light Source : Optical mice typically have a light-emitting diode (LED) that illuminates the surface beneath the mouse.

12. Wireless OR Cordless Mouse A c o rdle s s m o u s e , al s o called a wireless mouse , is a mouse that connects to a computer without the use of wires. It transmits data using Radio waves or Infrared Light waves.

13. Air Mouse Air Mouse is a Motion-Sensing mouse. It controls the objects by moving the mouse in specific directions through the air.

14. Touch Mouse I t i s a T o u c h - S e n s i t i ve mouse. I t w o r k s o n r e c o g n i z e s t h e touch gestures.

15. Trackball A trackball is a different kind of computer mouse . It is a plastic containing a ball on the top that moves a computer cursor around on the screen. The user can move the ball with their thumb or fingers, and sensors inside the case detect which direction the ball is moving.

16. Trackball The advantage of trackballs over mouse is that the trackball is stationary so it does not require much space to use it. You can place a trackball on any type of surface, including your lap.

17. Pointing Stick It is a pressure-sensitive device. A pointing stick is a small joystick used as a pointing device typically mounted centrally in a computer keyboard. It requires no additional space cleaning like mouse.

18. Touchpad or Trackpad It is a small flat surface over which the user moves his finger. It is also as Trackpad. The movement of finger moves the cursor on screen.

19. Touchpad I t i s a p o i n t i n g d e v i c e h a s a tactile sensor.

20. Key Features of a Touchpad: Surface Interaction : By sliding your finger across the touchpad, you move the on-screen cursor. The speed and direction of finger movement determine the cursor's motion. Tapping and Clicking : Tapping on the touchpad usually simulates a mouse click. Some touchpads have physical buttons, while others rely on specific zones or multi-finger gestures for clicking. Multi-Touch Gestures : Many modern touchpads support multi-touch gestures, such as: Pinch to zoom : Using two fingers to zoom in or out, similar to touchscreens. Two-finger scroll : Moving two fingers up, down, or sideways to scroll through pages. Swipe gestures : Three or four-finger swipes can trigger specific actions, like switching between applications or showing the desktop. Pressure Sensitivity : Some advanced touchpads can detect varying levels of pressure, enabling different actions based on how hard you press. Touchpads are favored for their compact design, making them ideal for portable devices. Although not as precise as dedicated mice, they offer convenience and support for various gestures and shortcuts.

21. Light pen A light pen is a pointing input device used to interact with a computer screen or other display devices. It is essentially a pen-like instrument that allows users to select objects, draw, or perform other operations directly on the screen. Light pens were popular during the early days of computer graphics Detection Mechanism : The light pen works by detecting the light emitted from a screen. When you touch the pen to the screen, it detects the exact position of the electron beam (in older CRT displays) or the pixel (in modern displays) under its tip. Interaction : When the pen senses the screen's light, it sends this information to the computer, allowing it to calculate the precise location where the pen is pointed. The computer can then respond to this input, such as selecting an icon or drawing on the screen. Position Tracking : The pen communicates with the display to track the position, so it functions as a precise pointing device.

22. Key Features of a Light Pen Direct Interaction : Unlike a mouse or touchpad, which is an indirect input method, the light pen allows users to interact directly with the screen, making it intuitive for tasks like drawing or selecting. Precision : Light pens can be very precise, especially for pixel-level operations, which is useful for graphic design, CAD (computer-aided design), and similar fields. Limited by Display Technology : Light pens were primarily used with CRT (cathode ray tube) monitors, which allowed for direct interaction with the scanning electron beam. With the shift to LCD and LED displays, light pens became less common, as they require different technology for detecting input. Applications: Graphic Design : Light pens were used for drawing and designing in early graphic design and animation software. CAD : Computer-aided design systems used light pens for precise drafting and engineering work. Medical Devices : In some cases, light pens are still used in specialized equipment, such as medical imaging devices.

23. DIGITIZING TABLET A digitizing tablet (or graphics tablet) is an input device that allows users to hand-draw images, sketches, and graphics, which are then transferred directly to a computer. It is commonly used by digital artists, designers, and engineers for precision work. Digitizing tablets are particularly popular in fields like digital illustration, graphic design, animation, and computer-aided design (CAD).

24. Key Components of a Digitizing Tablet: Tablet Surface : The flat, touch-sensitive area where the user interacts with the device. This surface detects the position of the stylus and converts the movements into digital data for the computer . Stylus (Pen) : A pen-like tool used to draw or write on the tablet. The stylus often features pressure sensitivity, which allows users to control the thickness and opacity of lines based on how hard they press Buttons and Hotkeys : Many tablets come with programmable buttons or hotkeys on the tablet itself, or on the stylus, which can be customized for quick access to frequently used functions (e.g., switching tools or undoing actions).

25. Key Features: Pressure Sensitivity : Most digitizing tablets support pressure sensitivity, meaning that the harder the user presses the stylus, the thicker or darker the resulting lines. This feature is crucial for artists who need to vary their strokes . Tilt Recognition : Some advanced tablets can detect the angle at which the stylus is held, allowing for more natural shading and brush effects, mimicking traditional drawing tools like pencils and brushes . Resolution : The tablet's resolution determines how accurately the tablet can capture fine details. Higher resolution tablets are preferred for professional work, as they provide more precision and smoother curves.

26. Applications Digital Art and Illustration : Artists use digitizing tablets for creating detailed illustrations, paintings, and graphic designs . Animation : Animation professionals often use tablets to create frame-by-frame animations and storyboards . Photo Editing : Tablets allow for precise retouching and manipulation of images in software like AdoBE Photoshop . CAD and 3D Modeling : Engineers and designers use tablets for precise drafting, sketching, and creating 3D models

27. Interactive Graphical Techniques

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