GDI Primitives

Started by sukishan, Jul 13, 2009, 12:15 AM

previous topic - next topic
Go Down

sukishan

The types of graphics displayed on the screen can themselves be divided in to several categories, which are called primitives. These are:

Bitmaps: A bitmap is an array of bits that represent the attributes of the individual pixels in an image (1 bit per pixel in a black-and-white display, multiple bits per pixel in a color or grayscale display). This is used to display complex images on the monitor
or printer. Bitmaps are also used to display small images such as icons, mouse cursors and buttons that appear in the toolbar.

Text: A Win32 macro that exists so that code can be compiled either as American National Standards Institute (ANSI) text or as Unicode. For Windows, which supports only Unicode, the macro forces the compiler to convert ANSI characters to Unicode characters. For example, passing the ANSI string "Hello Windows '' through the TEXT macro converts all characters in the string to 16-bit wide characters.

Lines and Curves: A line is a set of highlighted pixels on a video display (or a series of dots on a printed page) that is defined by two points: a starting point and an ending point. GDI supports straight lines, rectangles, ellipses, arcs that are partial curves on the ellipse and Bezier splines. Different type of curve can be drawn as a polyline which is a series of very short lines that define curve. Furthermore GDI draws lines using pen selected in the device context.

Filled areas: To sketch or fill in areas of a drawing with the color and pattern, brush is the tool used. Paint programs that offer a variety of brush shapes can produce brushstrokes of varying width and, in some cases, shadowing or calligraphic effects. A brush can be solid color, a pattern (which can be a series of horizontal, vertical or diagonal hatch marks) or a bitmapped image that is repeated vertically or horizontally within the area.
A good beginning makes a good ending

Go Up
 

Quick Reply

With Quick-Reply you can write a post when viewing a topic without loading a new page. You can still use bulletin board code and smileys as you would in a normal post.

Warning: this topic has not been posted in for at least 120 days.
Unless you're sure you want to reply, please consider starting a new topic.

Note: this post will not display until it's been approved by a moderator.
Name:
Email:
Verification:
Please leave this box empty:

Type the letters shown in the picture
Listen to the letters / Request another image

Type the letters shown in the picture:

shortcuts: alt+s submit/post or alt+p preview
IT Acumens Web Designing Chennai | GinGly :: Build your Personal Website | CineBuzz :: Cinema News | My Kids Diary :: Kids Memories Writing :: Book Website @ 349 Rs monthly
Copyright 2005 - 2020 :: IT Acumens :: All Rights Reserved. :: Sitemap
ITAcumens Discussion Forum with 2 lakhs post running for 15 years - Powered by IT Acumens Dedicated Server