.. _guimath: GUIMath ------- .. class:: GUIMath Syntax: ``obj = new GUIMath()`` Description: Contains functions which calculate common relationships between graphics objects. ---- .. 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. ---- .. 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. ---- .. 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 ---- .. 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)