New PDF release: GDI+ Programming: Creating Custom Controls Using C#

C

By Eric White

No matter if you're utilizing home windows kinds to construct rich-client enterprise purposes or the ASP.NET framework to construct strong net purposes or net companies, using well-designed portraits will significantly increase their usability, effect, and visible charm. This publication presents a finished consultant to using GDI+ in .NET functions and goals to supply builders with all of the info they should construct potent customized controls.

The commencing component of the e-book investigates the .NET Framework periods that enforce GDI+. It covers the entire periods, tools and suggestions had to create, manage, and demonstrate designated portraits in a sort, a web page being despatched to a printer or a picture.

On this starting place, the second one part describes find out how to layout and construct powerful customized controls to be used in a enterprise surroundings. themes lined contain construction composite controls, imposing keyboard navigation, and adorning design-time aid.

The ultimate component to the booklet explores using GDI+ and ASP.NET to construct customized controls that may offer reusable, GUI parts for internet tasks and to bring personalized pix over the net.

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Here, we'll examine: • The behavior of texture brushes, and how to use them • How linear gradient brushes can be used to give our custom controls a smooth, modern appearance • How to use the HatchBrush class to fill a region with a specified pattern We'll also see how we can use a brush to create a pen. This is a technique that allows us to use brush-type styles to perform pen-type operations, and hence gives us a great deal of extra flexibility in the types of effect we can achieve. Finally, we'll include a few words about how we can expect the creation of Pen and Brush objects to affect the performance of our applications.

We'll see how to layer this alternative coordinate system over the top of the existing GDI+ classes. This alternative coordinate system solves the problem of making readable, maintainable graphics code. Units of Measurement As we've said, the default unit of measurement for specifying points on the drawing surface in GDI+ is the pixel. Unless we specify otherwise, the values of arguments that we send to methods such as DrawRectangle are assumed to be in terms of pixels. However, there are other units of measurement that we can use, if our 48 Chapter 2: Drawing Surfaces Chapter 2: Drawing Surfaces 49 needs require them: Unit of Measure Display Document Inch Millimeter Pixel Point Physical Size 1/96 inch 1/300 inch 1 inch 1 millimeter 1 pixel (this is the default) 1/72 inch When writing custom controls, the most useful unit of measurement (by far) is the pixel.

We'll discuss pens and brushes in the next chapter. Method 40 Description Chapter 2: Drawing Surfaces Chapter 2: Drawing Surfaces Clear DrawArc DrawBezier DrawCurve 41 Fills the entire drawing surface with a background color, which is specified in the method call. Draws an elliptical arc. Thus, the arc is a portion of an ellipse-we specify a Pen object, the containing rectangle of the ellipse, and the start and sweep angles. Draws a Bézier spline. This is a curve drawn between two specified end-points, whose curvature is controlled by two more specified control points.

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