Java Reference
In-Depth Information
fill: Color.BLUE;
translateX: bodies[1].getPosition().getX()-translateX;
translateY: bodies[1].getPosition().getY()-translateY;
}
for (vector in points){
insert vector.getX() into fulcrum.points;
insert vector.getY() into fulcrum.points;
}
insert fulcrum into content;
insert crossbar into content;
effect = lighting;
update();
}
public override function update():Void{
crossbar.rotate = Math.toDegrees(bodies[0].getRotation());
crossbar.translateX = (bodies[0].getPosition().getX() - barWidth/2.0) - translateX;
crossbar.translateY = (bodies[0].getPosition().getY() - barHieght/2.0) - translateY;
}
}
The
init
function in Listing 6-9 shows how the
Bodies
are constructed. The
Body
in
bodies[0]
is the
'board' of the teeter totter, which is composed of a simple box, much like the
Wall
class. The triangular
fixed body acts as the fulcrum, and its shape is defined by specifying the points of triangle. The
Node
that
represents the fulcrum in the scene is constructed by iterating over this list points, creating a JavaFX
Polygon
based on those points. Lastly, the update method makes sure to update the position and
rotation of the crossbar as it moves.
Transition Example
Chapter 3 on transitions explored how to transition between two views; this chapter shows how to make
realistic animations with JavaFX and the open source library Phys2D. Why not combine the two?
The code in this example takes a
Group
that contains a number of
Control
nodes and creates an
animation that makes it appear as if the
Controls
are suddenly affected by gravity. In turn, each
Control
starts to fall, bouncing off the other
Controls
. The animation ends when all the
Controls
have fallen out
of the original bounds of their container, then the second
Group
of
Controls
fades in.
You'll find this example in a different package from the rest of this chapter. I found trying to
combine this transition example with the other examples created code that was not suitable for
demonstration. Please find this code in the package
org.lj.jfxe.chapter6.transition
, and start the
example by running the file
TransitionExampleMain
.
