[JAVA][Beginning Java 8 Games Development]

Chapter 16 ■ Collision Detection: Creating SVG Polygons for the Game Actors and Writing Code to Detect Collision
Figure 16-2. Click in a transparent area using Fuzzy Select Tool to select Actor
In this case, the Fuzzy Select tool is selecting transparency values. In fact, you should notice that you have to
select an option to select transparent areas in an image, using the Fuzzy Select Tool Options dialog, which can be seen
at the bottom of the Toolbox Tool Options floating palette. As you can see, I have instructed GIMP to not only “look” at
the RGB plates in the image, but also to look at the Alpha plate, by selecting the “Select transparent areas” option.
Now that we have that selection set that contains everything except the sprite character that we wanted to select,
we need to figure out a way to get the opposite of what we now have selected. Selecting the transparent areas was
admittedly much easier than trying to select the different colored areas of the InvinciBagel character! Fortunately
GIMP has an algorithm that inverts the selection completely, selecting everything that is not selected, and deselecting
everything that is selected.
Under the GIMP 2.8 Select menu, find the Invert option, or, use the Control+I keyboard shortcut, shown on the
menu next to the Invert option, all of which can be seen on the left half of Figure 16-3. Once you do this you will notice
that the animated “marching ants” no longer march around the square perimeter (extents) of the digital image and
that they are only around the InvinciBagel character, which means that the selection has been inverted and what we
wanted to select is now contained in the selection set.
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