In D computer graphics vectorized surface representations are most common bitmaps can be used for special purposes such as surface texturing heightfield data and bump mapping. At the lowend simple meshes of polygons are used to represent geometric detail in applications where interactive frame rates or simplicity are important. A Device Context DC is used to define the attributes of text and images that are output to the screen or printer. The actual context is maintained by GDI. A DC which is a handle to the structure is obtained before output is written and released after the elements have been written. A DC like most GDI objects is opaque meaning that you cant access its data directly but you can pass it to various GDI functions that will operate on it either to draw something to get information about it or to change the object in some way. At the highend where one is willing to tradeoff higher rendering times for increased image quality and precision smooth surface representations such as B�zier patches NURBS or Subdivision surfaces are used. One can however achieve a smooth surface rendering from a polygonal mesh through the use of shading algorithms such as Phong and Gouraud.
Formats
Oneof vector graphics format is SVG Scalable Vector Graphics an open standard created and developed by the World Wide Web Consortium to address the need and attempts of several corporations for a versatile scriptable and allpurpose vector format for the web and otherwise. A virtual printer is a piece of computer software whose user interface and API resemble that of a printer driver but which is not connected with a physical computer printer.When a user requests that a document be printed by a virtual printer then instead of having the document printed on paper or other material the underlying software would process its contents in some other way often resulting in a file being produced or the information being transmitted.
Typical uses of virtual printers
Producing PDF files Sending documents to a fax server Converting documents to image files like JPEG or multipage TIFF for sharing in universal platform independent format without any issues with missing fonts. A Device Context DC is used to define the attributes of text and images that are output to the screen or printer. The actual context is maintained by GDI. A DC which is a handle to the structure is obtained before output is written and released after the elements have been written. A DC like most GDI objects is opaque meaning that you cant access its data directly but you can pass it to various GDI functions that will operate on it either to draw something to get information about it or to change the object in some way. Allowing user to control certain aspects of printing not supported natively such as printing multiple pages per sheet without border print letterhead watermarks etc. This output can either be saved in a file for future printing or passed to another printer.
The Graphics Device
The Graphics Device Interface GDI sometimes called Graphical Device Interface is one of the three core components or subsystems together with the kernel and the Windows API for the user interface GDI window manager of Microsoft Windows. Producing PDF files Sending documents to a fax server Converting documents to image files like JPEG or multipage TIFF for sharing in universal platform independent format without any issues with missing fonts Allowing user to control certain aspects of printing not supported natively such as printing multiple pages per sheet without border print letterhead watermarks etc. This output can either be saved in a file for future printing or passed to another printer. GDI is a Microsoft Windows interface for representing graphical objects and transmitting them to output devices such as monitors and printers.GDI is responsible for tasks such as drawing lines and curves rendering fonts and handling palettes. It is not directly responsible for drawing windows menus etc. that task is reserved for the user subsystem which resides in userdll and is built atop GDI. GDI is similar to Apples classic QuickDraw.
Perhaps
Perhaps the most significant capability of GDI over more direct methods of accessing the hardware is its scaling capabilities and abstraction of target devices. Using GDI it is very easy to draw on multiple devices such as a screen and a printer and expect proper reproduction in each case. This capability is at the centre of all WYSIWYG applications for Microsoft Windows.Simple games which do not require fast graphics rendering use GDI. However GDI cannot animate properly no notion of synchronizing with the framebuffer and lacks rasterization for D. Modern games use DirectX or OpenGL which give programmers access to more hardware capabilities.
Technical details
A Device Context DC is used to define the attributes of text and images that are output to the screen or printer. The actual context is maintained by GDI. A DC which is a handle to the structure is obtained before output is written and released after the elements have been written. A DC like most GDI objects is opaque meaning that you cant access its data directly but you can pass it to various GDI functions that will operate on it either to draw something to get information about it or to change the object in some way.However GDI cannot animate properly no notion of synchronizing with the framebuffer and lacks rasterization for D. Modern games use DirectX or OpenGL which give programmers access to more hardware capabilities.
