barcode vb.net code 6: Working with Images in Java

Generator QR in Java 6: Working with Images

6: Working with Images
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In the preceding chapter, you learned how to create links to other pieces of information on the Internet Text phrases were used to mark links and give visitors something to click You could also use an image to label a link, with or without an additional text marker Figure 6-4 shows an example of an image used as a link without an additional text label, while Figure 6-5 s linked image does have a text label
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To link an entire image, as in Figures 6-4 and 6-5, you need only to add the a tag and the href attribute around the image Both figures show a linked banner ad The associated code looks like this:
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<a href="http://wwwchoppointorg"><img src="choppoint_468x60gif" width="468" height="60" alt="LINK: Chop Point Summer Camp in Woolwich, Maine" /></a>
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Figure 6-4
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Here, an image in this case an animated banner ad is used as a link to another web page
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As with any other linked elements in a web page, the visitor s pointer turns to a hand when she moves her mouse over the linked image (refer to Figures 6-4 and 6-5 for examples)
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When I link an image, I like to add LINK: to the beginning of my alternative text This immediately lets users who can t see the image know it is also a link
Link Sections of an Image
You can also link sections of an image, creating what are called image maps When only sections of an image are linked (as opposed to the entire image), the visitor s pointer only changes to the hand when he moves his mouse over one of the predefined hot spots on the image Each hot spot within an image map can link to its own web page, if wanted
Figure 6-5
As an alternative, a text label has been added in this example to help users understand where the link will take them
6: Working with Images
So, looking back at the drawing of a turtle, an image map could be used to link the eyes to one web page and the shell to a different one Another example of an image map is a picture of the United States, where each state could be designated as a hot spot, with its own link
In this example, when you move your mouse over the state of Texas, the pointer changes to a hand telling you Texas is a link You can see in the status bar at the bottom that the Texas hot spot links to a page called texashtml If you moved your mouse over another state, such as New Mexico, you would see it s linked to newmexicohtml The technical term for the type of image map discussed here is client-side image map Client-side image maps are so called because all the work is done on the client s (or visitor s) computer The work I refer to is the computation of where the hot spot is located and to which link it corresponds All the information about which hot spot is where and what it links to is included within the original HTML file This makes for easy access by your visitor s web browser because it doesn t have to look for the information elsewhere The following example shows an example of what that code looks like First, we have to tell the browser this image will be used as an image map Use the usemap attribute to do that and tell the browser where to look for the map file:
<img src="mapgif" width="575" height="328" alt="Click your state" usemap="#usa" /><br />Click the state in which you currently live
Then we name the map:
<map name="usa">
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and define each hot spot
<area shape="poly" coords="193,174,247,178,244,236,187,243,192,175" href="/newmexicohtml" alt="New Mexico" /> <area shape="poly" coords="215,243,304,309,335,260,326,214,275,210,275, 184,248,182,245,238,216,244" href="/texashtml" alt="Texas" />
After defining all the hot spots in the image, don t forget to close the map tag:
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