Java Reference
In-Depth Information
arcWidth: 10
fill: Color.BLUE
effect: ColorAdjust {
brightness: bind soundPlayer.levels[i] * 1.5 - .75;
contrast: bind soundPlayer.levels[i] * 3 + 0.25;
hue: bind soundPlayer.levels[i] * 1.5 - .75;
};
}
insert rect into content;
}
effect = Reflection{}
}
}
In Listing 9-8 we can see that this is actually a pretty simple class. The class
Bars
extends
AudioVisualizer
from Listing 9-7, so it has a
soundPlayer
available and is also a
Group
. The
init
function
in the class
Bars
creates one
Rectangle
for each item in the sequence
levels
of class
AudioPlayer
. Each
Rectangle
has its
translateX
value set so they are laid out right to left; this puts the higher frequency bars
to the right and the lower frequency bars to the left, as is common in these types of displays. The
height
of each
Rectangle
is bound to a value of
levels
times 200 to make them tall enough to see. The
translateY
is also bound to
levels
, which keeps the bottom of the
Rectangles
aligned as they change
size. Remember, a
Rectangle
's origin is the upper-left corner. Lastly, a
ColorAdjust
is applied to each
rectangle; the
ColorAdjust
has attributes bound to
levels
as well, and this makes the
Rectangle
change
color as it gets taller. Applying a
Reflection
to the entire class gives it that nice reflection at the bottom.
In my opinion, the
Bars
class does an excellent job of showing exactly what all that work on the Java
side was for, because we can clearly see that we have successfully decomposed the audio. The next effect
is much more abstract but is still interesting because it is synced to only part of the music.
Disco
This effect produces a circular region on the screen that is filled with a multicolored “burst.” Originally
I wanted to make an effect that was more like a star with solar flares coming off it; however, my first
attempt didn't look quite right. It reminded me of disco lights, and I thought that was more appropriate
anyway, so I ran with it. Figure 9-4 shows the effect by itself.
