The object of this tutorial is to learn how to make the applet below.
Please wait for the applet to load.
This applet is a graphical representation of a PGA (Pin Grid Array) package used in the electronics industry. If you are not familiar with electronic packaging, the yellow circles, with small black circles in them, represent connection pins on a package. The numbers on the top, and the letters on the left side, are coordinates on the grid that are used to represent pin numbers. For example: the top left pin is pin "A1".
Place your mouse cursor over a pin and see the pin name displayed in the text area at the bottom. Next, click on a pin and notice that a text field is displayed over the pin. Change the name of the pin and hit return. Move the cursor back over the pin to see the new name displayed. Now click on the part somewhere other than over a pin to see the resize handles. Drag a handle and let go to resize the part. Finally, hold the shift key and click somewhere other than a pin to remove the resize handles. Notice that the pin names still display properly when the mouse is over them.
The examples will start by building a simple circle, and then it will add functionality step-by-step until the applet shown above is complete. It is best to go through the examples in order since they build on each other. Remember that each example has an applet at the top and you screen will be partially blank while the applet loads.
For comments or questions contact Mike Jones (Mike.Jones@mass.com)