Python and GeoGebra numbers
A Number
is a dynamic value which can be used in
calculations and, e.g., as an x or y coordinate of a geometric
object. If the Number’s value changes, any geometric objects
depending on that Number will update.
The current numeric value (as a Python float
) of a
Number
can be get or set via its value
property.
Example
import time
x = Number(-3.0)
p_static = Point(x.value, 1.0)
p_dynamic = Point(x, 2.0)
for _ in range(600):
x.value += 0.01
time.sleep(0)
Running this code will show
p_static
a stationary point at (-3, 1), and
p_dynamic
a point which moves smoothly from (-3, 2) to (3, 2).
GeoGeobra also shows the two points differently, because the one
referred to by p_static
is independent whereas the one
referred to by p_dynamic
is not.
Calculations with Number
s
If you use a Number
in a calculation, the result is
another Number
. This works in a similar way to a
spreadsheet formula which refers to another cell — when a cell’s value
changes, all dependent cells update.
Example
import time
x = Number(-3.0)
x2 = 2.0 * x
p1 = Point(x, 1.0)
p2 = Point(x2, 2.0)
k1 = Line(p1, p2)
for _ in range(600):
x.value += 0.01
time.sleep(0)