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.. _hoc_guimath:
GUIMath
-------
.. hoc:class:: GUIMath
Syntax:
``obj = new GUIMath()``
Description:
Contains functions which calculate common relationships between graphics
objects.
----
.. hoc:method:: GUIMath.d2line
Syntax:
``d = math.d2line(xpoint, ypoint, xline0, yline0, xline1, yline1)``
Description:
Return distance between the point (xpoint,ypoint) and the (infinitely long)
line defined by the 0 and 1 points.
----
.. hoc:method:: GUIMath.d2line_seg
Syntax:
``d = math.d2line_seg(xpoint, ypoint, xline0, yline0, xline1, yline1)``
Description:
Return distance between the point (xpoint,ypoint) and the line segment
line defined by the 0 and 1 points.
----
.. hoc:method:: GUIMath.inside
Syntax:
``boolean = math.inside(xpoint, ypoint, left, bottom, right, top)``
Description:
return 1 if the point is inside the box, 0 otherwise
----
.. hoc:method:: GUIMath.feround
Syntax:
``mode = math.feround()``
``lastmode = math.feround(mode)``
Description:
Set the floating point rounding mode. Mode 1, 2, 3, 4 refers to
FE_DOWNWARD, FE_TONEAREST, FE_TOWARDZERO, FE_UPWARD respectively.
The default, and most accurate, mode is FE_TONEAREST.
The mode is changed only if the argument is 1-4. If there is no
support for this function the return value is 0.
This function is useful to determine if a simulation depends unduly
on double precision round-off error.
Example:
.. code-block::
none
objref gm
gm = new GUIMath()
{printf("default rounding mode %d\n", gm.feround())}
proc test_round() {local i, old, x localobj gm
gm = new GUIMath()
old = gm.feround($1)
x = 0
for i=1, 1000000 x += 0.1
printf("rounding mode %d x=%25.17lf\n", $1, x)
gm.feround(old)
}
for i=1, 4 test_round(i)
|
