Polymap
Image Mapping with Polymap
The concept of Polymap is simple: using
the application-specific fields in GIF files to store mapping information. Thus
the mapping information, in the form of polygons, is tightly coupled with the
image. To use Polymap:
- -
Add polygon
objects in the image of your choice: The shareware Polymap Toolkit (Windows
version), which provides an easy way to do so.
- -
View Polymap
images: Polymap images are still valid GIF's, and can be read by most GIF
viewers. The Java Polymap Applet shown here takes advantage of the Polymap
data to provide a highly interactive image mapping environment. The HTML
code for the Java applet looks like:
<applet code=PolyMap.class width=416
height=325>
<param name=img
value=tourmap.gif>
<param name=baseurl
value=http://www.whitehouse.gov/WH/glimpse/tour/html/>
</applet>
where PolyMap.class is the Java Polymap Applet class,
width and height are the image
dimensions, and img's value is the Polymap GIF
file. The optional baseurl specifies the
"prefix" to be attached to the URL associated with each Polymap
object. For example, if the URL of an object is tt.htm, and the baseurl is http://www.ttt.edu/, then the resulting
URL is http://www.ttt.edu/tt.html. If baseurl is
not specified, the
baseurl of the current page
will be used unless the URL already specifies a protocol, i.e. starts with
http://, gopher:// etc. Other optional parameters are
<param name=target value=main>
<param name=highlight value=off>
<param name=color value=FF00FF>
The target parameter specifies the frame to load the
URL of a Polymap object when the object is clicked. The highlight parameter is default to on. If highlight is off, the applet will outline Polymap objects with the
color specified by the color parameter, which
takes a value of the form of RRGGBB (each of the RR, GG, and BB may be
00-FF). The default color is 0000FF, or blue.
- -
Interact with
Polymap images: With the Java applet above, you will experience interactive
outlining/highlighting of the predefined polygon objects, and displaying of
their names/URL on the status bar as the mouse cursor moves over them.
Clicking on the outlined/highlighted object will load the object pointed to
by its name/URL.
Back to the Polymap applet page.
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