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450 Homework Assignment #3: Animated Applet
animated applet, FallingStar, contains 2 animated shapes. The first
is a 3DRectangle. The color is randomized and changes in every frame.
The Rectangle moves in a linear fashion, similar to the bouncing ball, although
the constants defining the path have been changed. In addition, the width
and height of the rectangle are randomly chosen at the initiation of the applet
and the size of the rectangle changes over time. The rectangle switches between
growth and contraction every time a wall is hit or a minimum or maximum size
(25% of the applet box dimension) for width or height is met.
second component of the applet is a 5-pointed star rendered
as a polygon object. The color of the star is randomized and is the
same as the 3DRectangle. The "falling star" starts at the top of
the applet box and drops to the bottom. When at the bottom, a random location
is selected at the top of the box and the star falls again. Unlike the changing
rectangle, each falling star is a newly generated object. The positioning
of the star is accomplished with the translate method in the polygon class.
When the Rectangle object fully contains the star object, the program prints
text, halts temporarily and restarts the fall of the star from a random point
along the top.
note: I tried to use the Rectangle class method "contains" to determine
whether the star was in the box. However, while it would work in the appletviewer,
it would not work in either a NS 4.7 or IE 5.0 browser window. Thus, in the
applet shown here I substituted my own comparison code instead of the "contains"
background on which the graphics are drawn and the speed with
which they are drawn are determined in the HTML file using parameters
in the applet tag. There are three paramters supplied as integers. The text
color is the "inverse" of the color supplied in the parameter
tag as determined by subtracting the color value from 255.
Source code for Animated Applet: FallingStar.java