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Swing s approach to painting is built on the original AWT-based mechanism, but Swing s implementation offers more finally grained control Before examining the specifics of Swing-based painting, it is useful to review the AWT-based mechanism that underlies it The AWT class Component defines a method called paint( ) that is used to draw output directly to the surface of a component For the most part, paint( ) is not called by your program (In fact, only in the most unusual cases should it ever be called by your program) Rather, paint( ) is called by the run-time system whenever a component must be rendered This situation can occur for several reasons For example, the window in which the component is displayed can be overwritten by another window and then uncovered Or, the window might be minimized and then restored The paint( ) method is also called when a program begins running When writing AWT-based code, an application will override paint( ) when it needs to write output directly to the surface of the component Because JComponent inherits Component, all Swing s lightweight components inherit the paint( ) method However, you will not override it to paint directly to the surface of a component The reason is that Swing uses a bit more sophisticated approach to painting that involves three distinct methods: paintComponent( ), paintBorder( ), and paintChildren( ) These methods paint the indicated portion of a component and divide the painting process into its three distinct, logical actions In a lightweight component, the original AWT method paint( ) simply executes calls to these methods, in the order just shown To paint to the surface of a Swing component, you will create a subclass of the component and then override its paintComponent( ) method This is the method that paints the interior of the component You will not normally override the other two painting methods When overriding paintComponent( ), the first thing you must do is call superpaintComponent( ), so that the superclass portion of the painting process takes place (The only time this is not required is when you are taking complete, manual control over how a component is displayed) After that, write the output that you want to display The paintComponent( ) method is shown here: protected void paintComponent(Graphics g) The parameter g is the graphics context to which output is written To cause a component to be painted under program control, call repaint( ) It works in Swing just as it does for the AWT The repaint( ) method is defined by Component Calling it causes the system to call paint( ) as soon as it is possible to do so Because painting is a time-consuming operation, this mechanism allows the run-time system to defer painting momentarily until some higher-priority task has completed, for example Of course, in Swing the call to paint( ) results in a call to paintComponent( ) Therefore, to output to the surface of a component, your program will store the output until paintComponent( ) is called Inside the overridden paintComponent( ), you will draw the stored output. vb.net ean 13 reader .NET EAN - 13 Barcode Reader for C#, VB . NET , ASP.NET Applications
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NET EAN - 13 Barcode Reader , Reading EAN - 13 barcode images in .NET, C#, VB . NET , ASP.NET applications. When drawing to the surface of a component, you must be careful to restrict your output to the area that is inside the border Although Swing automatically clips any output that will exceed the boundaries of a component, it is still possible to paint into the border, which will then get overwritten when the border is drawn To avoid this, you must compute the paintable area of the component This is the area defined by the current size of the component minus the space used by the border Therefore, before you paint to a component, you must obtain the width of the border and then adjust your drawing accordingly To obtain the border width, call getInsets( ), shown here: Insets getInsets( ) This method is defined by Container and overridden by JComponent It returns an Insets object that contains the dimensions of the border The inset values can be obtained by using these fields: int top; int bottom; int left; int right; These values are then used to compute the drawing area given the width and the height of the component You can obtain the width and height of the component by calling getWidth( ) and getHeight( ) on the component They are shown here: int getWidth( ) int getHeight( ) By subtracting the value of the insets, you can compute the usable width and height of the component vb.net ean 13 reader EAN - 13 VB . NET DLL - KeepAutomation.com
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NET. Free demo download. How to read, scan EAN - 13 linear barcode image in . NET applications ... High-quality barcode reader ; C#, VB . NET sample code ... Resize the table so the first column is 150px wide and the second column is approximately 339px wide Here is a program that puts into action the preceding discussion It creates a class called PaintPanel that extends JPanel The program then uses an object of that class to display lines whose endpoints have been generated randomly Sample output is shown in Figure 10-4 MIDlet-Name: RecordEnumerationExample MIDlet-Version: 10 MIDlet-Vendor: MyCompany MIDlet-Jar-URL: RecordEnumerationExamplejar MIDlet-1: RecordEnumerationExample, , RecordEnumerationExample MicroEdition-Configuration: CLDC-10 MicroEdition-Profile: MIDP-10 MIDlet-JAR-SIZE: 100 FIGURE 29-4 vb.net ean 13 reader VB . NET Image: VB Code to Read and Recognize EAN - 13 Barcode from ...
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