Practical Activities in VB.NET

Encoder QR-Code in VB.NET Practical Activities
Practical Activities
QR Code JIS X 0510 Creation In VB.NET
Using Barcode encoder for .NET Control to generate, create QR Code image in VS .NET applications.
Practical Activities
Creating Barcode In Visual Basic .NET
Using Barcode creation for Visual Studio .NET Control to generate, create bar code image in .NET applications.
A Simple CAD Program
QR Code Encoder In Visual C#.NET
Using Barcode creator for .NET framework Control to generate, create Denso QR Bar Code image in VS .NET applications.
We can use the graphics facilities described earlier to build a program that allows the user to create drawings on a PC The Graphics class in VB NET contains methods for drawing lines, rectangles, circles and ellipses and curves in a range of colours and with de ned ll-styles We can add user-interface facilities to allow the user to select colours from a palette, draw shapes interactively and possibly even edit the graphics created First we need a brief description of ComputerAided Drawing (CAD) fundamentals
QR Encoder In VS .NET
Using Barcode creation for ASP.NET Control to generate, create Quick Response Code image in ASP.NET applications.
CAD and Objects
Draw QR Code JIS X 0510 In Visual Studio .NET
Using Barcode maker for .NET Control to generate, create QR Code image in .NET framework applications.
In computer aided drawing, a user creates shapes on a computer display We can create drawings in two distinct ways: using bitmapped graphics, as done in Windows Paint and Photoshop, or using object-oriented graphics, as done by Corel Draw and all CAD programs Bitmapped graphics are ideal for creating and storing pictures of great complexity, such as photographs and highly detailed images The reason for this is that each single dot, or pixel, that makes up a bitmapped picture is an object in its own right, with its own colour, and so however complex a photograph is, containing however many separate colours, it can be broken down into a grid of dots and represented as a bitmap The quality of a bitmap is determined by its resolution, which is related to the number of dots in each row and the number of rows of dots that make up the picture The limitation of a bitmapped image is that every picture contains a huge number of dots, but no matter how many dots there are if you move in close enough, you can see the individual dots An object-oriented or shape-oriented picture is made up of simple descriptions of each gure on it For example, a picture can be composed of a red circle centred on location 100, 100 with a radius of 50, and a blue rectangle whose top, left corner is at location 150, 400 and that is 200 units wide and 150 units high This type of picture is usually much simpler than a bitmapped photograph, but for some purposes, illustration and diagrams for example, it is preferable Pictures like this can be stored as simple descriptions and drawn as necessary, rather than stored as the colour of every single pixel in the picture They can also be more easily edited, so that a shape can be moved to a different location by changing a number or two, or deleted entirely without affecting the rest of the picture ( just try removing a person who strayed into one of your photographs in a program like Photoshop to see how dif cult this can be in a bitmapped image) Finally, we can redraw an object-oriented picture at any scale we like by changing the numbers that describe the shapes doubling each number would double the size of each shape as we draw it If we try to re-size a bitmapped image like this, each individual pixel must get bigger, and the picture quality reduces (Figure 915 shows how a bitmapped circle drawn at too large a scale would appear) A CAD drawing is stored as a list of objects, each of which contains numbers to specify its location in the picture, its size and its colour Different shapes are
Barcode Creator In Visual Basic .NET
Using Barcode generation for .NET Control to generate, create bar code image in .NET applications.
9 n WinForms Controls in Detail
Bar Code Drawer In Visual Basic .NET
Using Barcode generator for .NET Control to generate, create bar code image in .NET framework applications.
described by different combinations of numbers For example, we need three numbers to describe the size and location of a circle (where its centre is in the X and Y directions and what its radius is) but four to describe a rectangle (the location of its top, left corner, its width and its height) We can use objects to hold the numbers that describe each shape, and since all shapes will have some things in common (each will have X and Y coordinates to specify its location, each will have a colour and each will need to be drawn on a display), we can use inheritance to create a basic shape and then inherit this in each new shape we decide to support in the program
Make USS Code 39 In Visual Basic .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create USS Code 39 image in .NET applications.
Make Code128 In Visual Basic .NET
Using Barcode generation for Visual Studio .NET Control to generate, create ANSI/AIM Code 128 image in .NET framework applications.
Barcode Printer In Java
Using Barcode creator for Java Control to generate, create bar code image in Java applications.
ANSI/AIM Code 39 Generation In Visual C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create Code 39 Full ASCII image in Visual Studio .NET applications.
ECC200 Creation In Visual Studio .NET
Using Barcode maker for .NET Control to generate, create Data Matrix image in VS .NET applications.
Code 39 Full ASCII Printer In VS .NET
Using Barcode printer for ASP.NET Control to generate, create Code39 image in ASP.NET applications.
Recognize GS1 - 12 In VS .NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.