I would like to ask on how to display a math-text in a kivy app..? For example : How to do the same thing as $ \frac{1}{2} $ or $ 2^{3} $ does in LaTeX (omitting the font type, as long as it is math-readable).
I know that in matplotlib.pyplot module, I can use string : r'$ \frac{1}{2} $' or r'$ 2^{3} $' to produce a math-text. But this does not produce the desired result in kivy :
Label(text = r'$\frac{1}{2}$' ) will reproduce $\frac{1}{2}$.
Thanks.
Please Take a look at the sympy module, then in your label you must use a font_name that can display math-text
but If you want to use Latex formula then you have to find a font_name that can display those formula like you want
Update: Otherwise you can generate your Latex in a png then integrate it in your kivy app
Actually I tried 2 ways to display mathematical notation on Kivy Label: (Each of way includes SymPy or Matplotlib)
1- Use SymPy printing module
from sympy import *
...
init_printing(use_unicode=True)
Do not forget this piece display mathematical notation but you have to use needed font name for Kivy label to display mathematical notation perfectly. I know one, it's "dejavusans mono" yeah this is monospace font.
2- Use Matplotlib. turn to png then display the png on Kivy Image here is good example display math symbols with matplotlib
*(here is sample code):
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.boxlayout import BoxLayout
from kivy.lang.builder import Builder
from sympy import *
x,y,z = symbols('x y z')
init_printing(use_unicode=True)
kiv=Builder.load_string("""
<MainScreen>:
BoxLayout:
orientation:'vertical'
Label:
id:lbl1
text:'math-equation'
markup:True
#font_name:'dejavusansmono.ttf' ----here your monospace font
Label:
id:lbl2
text:'math-equation'
markup:True
#font_name:'dejavusansmono.ttf' ----here your monospace font
Button:
id:btn
text:'Display'
on_press:root.display()
""")
class MainScreen(BoxLayout):
def display(self):
expression=Derivative(sqrt(x+2)*cos(x+2), x)
answer=expression.doit()
good_symbols1=pretty(expression)
good_symbols2=pretty(answer)
self.ids.lbl1.text=good_symbols1
self.ids.lbl2.text=good_symbols2
class Example(App):
def build(self):
scr=MainScreen()
return scr
Example().run()
[Out]: 
I have recently developed a package that allows to include latex equations in a kivy label.
You can install it with :
pip install kivy-latex-label
Here is a quick demo of how to use it :
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.core.window import Window
from kivy_latex_label import LatexLabel
class DemoApp(App, Widget):
def build(self):
Window.clearcolor = (1, 1, 1, 1)
if __name__ == "__main__":
DemoApp().run()
#:kivy 2.0.0
FloatLayout:
size_hint: (1,1)
LatexLabel:
pos_hint: {"top":1,"x":0.05}
size_hint:(0.9,1)
text: r"The SINDy method is a recently developed technique that leverages sparse regression to identify the governing equations from a given time series (Figure 1). We consider a system with state $\boldsymbol{x}(t)=\left[x_{1}(t), x_{2}(t), \ldots x_{d}(t)\right]^{\top} \in$ $\mathbb{R}^{d}$ governed by the differential equation: $\dot{\boldsymbol{x}}=\boldsymbol{f}(\boldsymbol{x})$."
color: (0,0,0,1)
text_size: root.size
valign: "top"
font_size: 20
The project is on github if you want to adapt the code to your application: https://github.com/PaulCreusy/kivy-latex-label
