TI-84 Plus CE Python:
Drawing Shapes with the ti_plotlib module
Introduction
Here
are four scripts to draw shapes:
RECT8:
rectangles and squares centered at (0, 0)
ELLIPSE8:
ellipses and circles centered at (0, 0)
POLYGON8:
polygons given the vertex points and number of vertices
INVFUNC8:
draws a function f(x) and it’s inverse f^-1(x). Define the
function is defined in the f(x) subroutine in the program.
The
plot window is sized in sync with the TI-84’s screen size (320
pixels x 220 pixels) so that squares look like squares and circles
look like circles. The window parameters are set as such:
Xmin
= -16, Xmax = 16
Ymin
= -10.5, Ymax = 10.5
TI-84
PLUS CE Python Script: RECT8.py
import
ti_plotlib as plt
from
math import *
#
draw an rectangle using ti_plqtlib
#
get parameters
print(“Press
[clear] to \nexit the graph.”)
print(“x:[-16,16]
\ny:[-10.5,10.5]”)
a=eval(input(“horiz.
length? “))
b=eval(input(“vert.
length? “))
#
plot routine
plt.cls()
plt.title(“Rectangle”)
plt.window(-16,16,-10.5,10.5)
plt.axes(“on”)
plt.grid(1,1,”dot”)
#
color: blue
plt.color(0,0,192)
#
pen size
plt.pen(“medium”,”solid”)
plt.line(-a/2,b/2,a/2,b/2,””)
plt.line(-a/2,-b/2,a/2,-b/2,””)
plt.line(-a/2,-b/2,-a/2,b/2,””)
plt.line(a/2,-b/2,a/2,b/2,””)
plt.show_plot()
TI-84
PLUS CE Python Script: ELLIPSE8.py
import
ti_plotlib as plt
from
math import *
#
draw an ellipse using ti_plqtlib
#
get parameters
print(“Press
[clear] to \nexit the graph.”)
print(“x:[-16,16]
\ny:[-10.5,10.5]”)
a=eval(input(“x
axis? “))
b=eval(input(“y
axis? “))
#
plot routine
plt.cls()
plt.title(“Ellipse”)
plt.window(-16,16,-10.5,10.5)
plt.axes(“on”)
plt.pen(“medium”,”solid”)
plt.grid(1,1,”dot”)
#
color: green
plt.color(0,192,0)
for
i in range(128):
x=a*cos(i*pi/64)
y=b*sin(i*pi/64)
plt.plot(x,y,”o”)
plt.show_plot()
TI-84
PLUS CE Python Script: POLYGON8.py
import
ti_plotlib as plt
from
math import *
#
draw an rectangle using ti_plqtlib
#
get parameters
print(“Press
[clear] to \nexit the graph.”)
print(“x:[-16,16]
\ny:[-10.5,10.5]”)
n=int(input(“#
of vertices? “))
a=eval(input(“x1?
“))
b=eval(input(“y1?
“))
x=[a]
y=[b]
for
i in range(n-1):
print(“vertex
“,i+2)
c=eval(input(“x?
“))
d=eval(input(“y?
“))
x.append(c)
y.append(d)
x.append(a)
y.append(b)
#
plot routine
plt.cls()
plt.title(“Polygon”)
plt.window(-16,16,-10.5,10.5)
plt.axes(“on”)
plt.grid(1,1,”dot”)
plt.color(75,0,130)
plt.pen(“medium”,”solid”)
for
i in range(n):
x0=x[i]
y0=y[i]
x1=x[i+1]
y1=y[i+1]
plt.line(x0,y0,x1,y1,””)
plt.show_plot()
TI-84 PLUS CE Python Script:
INVFUNC8.py
Define
f(x) in the def f(x) function routine. The math module is imported.
import
ti_plotlib as plt
from
math import *
#
f(x) and f**-1(x)
#
define f(x)
def
f(x):
return
x**2+6
#
plot routine
plt.cls()
plt.title(“f(x)
and its inverse”)
plt.window(-16,16,-10.5,10.5)
plt.axes(“on”)
plt.grid(1,1,”dot”)
plt.pen(“medium”,”solid”)
for
i in range(320):
x=-16+i*32/320
y=f(x)
plt.color(0,0,192)
plt.plot(x,y,”o”)
plt.color(255,165,0)
plt.plot(y,x,”o”)
plt.show_plot()
Download
the four scripts here:
https://drive.google.com/file/d/1ELL6mEzMXrIJlOSSFocOZGJTza-kBZoU/view?usp=sharing
Eddie
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