Animating A Collection Of Graphics - HP 48gII User Manual

Graphing calculator.

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Animating a collection of graphics

The calculator provides the function ANIMATE to animate a number of
graphics that have been placed in the stack. You can generate a graph in the
graphics screen by using the commands in the PLOT and PICT menus. To
place the generated graph in the stack, use PICT RCL. When you have n
graphs in levels n through 1 of the stack, you can simply use the command n
ANIMATE to produce an animation made of the graphs you placed in the
stack.
Example 1 – Animating a ripple in a water surface
As an example, type in the following program that generates 11 graphics
showing a circle centered in the middle of the graphics screen and whose
radius increase by a constant value in each subsequent graph.
«
RAD
131 R B 64 R B PDIM
0 100 XRNG 0 100 YRNG
1 11 FOR j
ERASE
(50., 50.) '5*(j-1)'
0 '2*π'
NUM ARC
PICT RCL
NEXT
11 ANIMATE
"
Store this program in a variable called PANIM (Plot ANIMation).
program press J (if needed) @PANIM.
minute to generate the graphs and get the animation going.
really patient here. You will see the hourglass symbol up in the screen for
what seems a long time before the animation, resembling the ripples
produced by a pebble dropped on the surface of a body of quiescent water,
appears in the screen. To stop the animation, press \$.
NUM
It takes the calculator more than one
Begin program
Set angle units to radians
Set PICT to 131×64 pixels
Set x- and y-ranges to 0-100
Start loop with j = 1 .. 11
Erase current PICT
Centers of circles (50,50)
Draw circle center r = 5(j-1)
Place current PICT on stack
End FOR-NEXT loop
Animate
End program
To run the
Therefore, be
Page 22-27

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