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The drawImage() method used in previous listings in this chapter draws an image on the canvas based on a clipping region A clipping region is a rectangular piece of an image defined by two sets of coordinates The first set identifies the upper-left corner of the clipping region, and the second set is the width and height of the clipping region Only the portion of the image that appears within the clipping region is drawn on the canvas Other portions of the image still exist within the image but are not drawn The entire canvas is the default clipping region and is used to draw the complete image whenever the drawImage() method is called Let s return to the filled arc created and drawn in Listing 7-17 to see how adjusting the clipping region changes the way an image is drawn on the canvas The image boundary box of the filled arc in Listing 7-17 has the coordinates 10, 10, 60, 60 This means the upper-left corner of the box appears at cell 10, 10 and has a width of 60 and height of 60 The clipping region is the entire canvas We can show a piece of the filled arc by setting the clipping region to 35, 35, 40, 40, which is what happens in Listing 7-23 Only a portion of the filled arc is drawn when the drawImage() method is called You set the clipping region by calling the setClip() method of the Graphics class The setClip() method requires four parameters The first two parameters are integers representing the upper-left corner coordinates of the clipping region, and the third and fourth parameters are integers representing the width and height of the clipping region You can also reduce the size of a clipping region by calling the clipRect() method The clipRect() method also requires the same four parameters as the setClip(), except coordinates passed to the clipRect() method refer to the new clipping region There are four other methods that you might find handy when working with a clipping region These are the getClipX() method, getClipY() method, getClipHeight() method, and getClipWidth() method The getClipX() method and getClipY() method return upper-left coordinates of the existing clipping region Similarly, the getClipHeight() method returns the height and getClipWidth() method returns the width of the existing clipping region. 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. 2 Create instances of classes and assign those instances to references 3 Display the instance of the Canvas class whenever the MIDlet is started 4 Terminate the MIDlet when the Exit command is selected 5 Define a class derived from the Canvas class that implements a CommandListener 6 Within the derived class, declare references 7 Within the derived class, create an instance of the Command class 8 Within the derived class, associate the instance of the Command class with the canvas 9 Within the derived class, associate the CommandListener with the canvas 10 Request a block of memory sufficient to hold the image, and then create the image, if you are using a mutable image Otherwise, identify the file name that contains the immutable image Display an error message if there is a problem creating the image or opening the file that contains the image 11 Within the derived class, define a paint() method that determines whether the image was successfully created or the image file was successfully opened If so, create a new clipping region and draw the image on the canvas 12 Within the derived class, define a commandAction() method to process the Exit command vb.net ean 13 reader EAN - 13 VB . NET DLL - KeepAutomation.com
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