HP 39g hp 39g+ (39g & 40g)_mastering the hp 39g+_English_E_F2224-90010.pdf - Page 223

TRANSF.SV, VIEWS, TRANSF.SHAPE, Assuming that you have, program to create the new, altered

Page 223 highlights

.TRANSF.SHAPE .TRANSF.MAT This program (left) uses the CHOOSE command to offer a list of options. Note the need to pre-load a value into C. This value determines which option is highlighted when the menu appears. If a list has only three options but the highlight is set to some other value than those three then it can crash the program. Options 1 and 2 load preset matrices while option 3 allows the user to edit their own. Note the check to ensure the matrix they entered has a valid size. The number of columns is then extracted and used to reset the value of Tmax. The new image matrix is also recalculated. The indenting used is not required and is there simply to make the program easier to read. This program puts up a message instructing the user and then allows them to edit the transformation matrix in M1. The size of the matrix is checked to ensure it is 2x2, with the DO...UNTIL loop ensuring that the user cannot exit without a valid matrix entered. Assuming that you have the .TRANSF.SV program to create the new altered VIEWS menu then you can now test the aplet. Its operation should be familiar to you if you have already examined its 'cousin' on page 194. 223

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223
.TRANSF.SHAPE
.TRANSF.MAT
This program (left) uses the
CHOOSE command to offer a list of
options. Note the need to pre-load a
value into C. This value determines
which option is highlighted when the
menu appears.
If a list has only
three options but the highlight is set
to some other value than those three
then it can crash the program.
Options 1 and 2 load preset
matrices while option 3 allows the
user to edit their own. Note the
check to ensure the matrix they
entered has a valid size. The
number of columns is then extracted
and used to reset the value of Tmax.
The new image matrix is also
recalculated.
The indenting used is not required
and is there simply to make the
program easier to read.
This program puts up a message
instructing the user and then allows
them to edit the transformation
matrix in M1. The size of the matrix
is checked to ensure it is 2x2, with
the DO°UNTIL loop ensuring that
the user cannot exit without a valid
matrix entered.
Assuming that you have
the
.TRANSF.SV
program to create the new
altered
VIEWS
menu then you can now test the aplet. Its operation should be
familiar to you if you have already examined its ±cousin² on page 194.