The PHP front end to Juggling Lab allows you to quickly animate patterns by embedding all the animation instructions within a URL.
Try clicking on the following examples to get the idea. You can alternatively type this text directly into the browser address bar to pull up the animation. (Note: To see the animation you need a browser with Java available and enabled.)
The pattern information comes after the '?'
in the URL. It can have two basic formats:
"var1=a;var2=b;var3=c"
and so on.When the second form above is used, Juggling Lab recognizes the following variables. Only the pattern
variable is required; the others are optional.
pattern
– siteswap pattern to animate, in generalized siteswap notation. No default.bps
– number of beats per second, a floating point value. Default is
automatically calculated from the pattern.dwell
– number of beats a catch is made prior to the subsequent throw. Values are floating-point numbers between 0.0 and 2.0; default is 1.3.hands
– hand movement as a sequence of spatial coordinates
for catches and throws and points in-between. This should be provided in the format used in
the siteswap input panel.body
– body movement as a sequence of angles and spatial coordinates. This should be provided in the format used in
the siteswap input panel.colors
– determines the coloring of the props. Each color is defined either
by name or by its red/green/blue components on a 0-255 scale. Thus if this
setting is equal to {red}
or {255,0,0}
, the animator will use red balls.
If you define several colors, they will be assigned to the balls in a cyclical manner. For example,
{255,0,0}{0,255,0}
means that ball 1 is red, ball 2 is green, ball 3 is red,
ball 4 is green, and so on. Recognized color names are:
black, blue, cyan, gray, green, magenta, orange, pink, red, yellow
. Using the
value mixed
(no braces) will apply a pre-defined mix of colors. Default is red balls.propdiam
– diameter of the props, in centimeters. Values are
floating-point numbers greater than 0.0; default is 10.0.prop
– prop type to use. Recognized prop names are ball
, image
, and ring
; default is ball
.gravity
– acceleration of gravity, in cm/sec^2. Values are floating-point
numbers; default is 980.0 (earth standard).bouncefrac
– fraction of a ball's energy retained after bouncing off the ground
(how much of its dropped height does it return to?). Values are floating point numbers greater than 0.0;
default is 0.9.stereo
– determines whether to display the pattern as a cross-eyed stereogram. Values are true/false; default value is false.dbuffer
– determines if the display will be double-buffered to minimize flicker. Values are true/false; default value is true.startpaused
– causes the animator to wait for a prompt from the user to begin animation. Values are true/false; default value is false.fps
– sets the number of frames per second to be drawn by the animator. Values are floating point
numbers greater than 0.0; default value is 30.0.slowdown
– defines an overall time slowdown factor (e.g., slowdown=1.0 is actual speed,
slowdown=2.0 is half actual speed). Values are floating point numbers greater than 0.0; default value is 2.0.border
– defines a border (in pixels) around the animation. Values are integers greater than
or equal to 0; default value is 0.The following variables are also supported for backward compatibility, but their continuing use is discouraged. Most are documented elsewhere:
tps
– use bps
instead.dratio
– defined as half of dwell
. In the typical
case where a given hand throws on every other beat, this equals the fraction of time the
hand is filled with a ball.
Values are floating-point numbers between 0.0 and 1.0; default is 0.65.throwx
– use hands
instead .rightthrowx
– use hands
instead.leftthrowx
– use hands
instead.catchx
– use hands
instead.rightcatchx
– use hands
instead.leftcatchx
– use hands
instead.balldiam
– use propdiam
instead.g
– use gravity
instead.mat_style
– use hands
instead.mat_HR
– use tps
instead.mat_DR
– use dratio
instead.