Name: joT67522 Date: 01/08/98


I am currently developing a java application (for
NT) that uses both Swing and JDBC to access a MS
Access db. A Bug in the Access driver causes a
SQL Exception to occur on any SQL query involving
a number after a floating point error has occured
(like a divide by zero).  I have found that the
default behavior of the BasicScrollBarUI (simply
using a JScrollPane) has two divide by zero
errors.

Refering to the 0.7 src release, they occur on
lines 457 and 541.  I have the current code and
my fix to those lines below.  The fix assumes
that a number divided by zero is infinity, and
zero times infinity is zero. It returns the same
result as if the calculation occured, but with
out causing a fp error.

current:
457        int thumbH = (int)(trackH * (extent / range));

fix:
        int thumbH = (trackH == 0) ? 0 : (range == 0) ? Integer.MAX_VALUE :
           (int)(trackH * (extent / range));

current:
541        int thumbW = (int)(trackW * (extent / range));

fix:
        int thumbW = (trackW == 0) ? 0 : (range == 0) ? Integer.MAX_VALUE :
            (int)(trackW * (extent / range));
(Review ID: 22709)
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