 GUIMath
 d2line · d2line_seg · feround · inside
GUIMath¶ ↑

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

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.

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.

GUIMath.
inside
()¶ ↑  Syntax:
boolean = math.inside(xpoint, ypoint, left, bottom, right, top)
 Description:
 return 1 if the point is inside the box, 0 otherwise

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 14. 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 roundoff error.
Example:
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)