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app.py
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app.py
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import datetime as dt
import dash
import dash_core_components as dcc
import dash_html_components as html
import numpy as np
import plotly.graph_objs as go
from dash.dependencies import Input, Output
import data
'''
TODO:
-Create venv
-Add an hourly reset feature and increment x axis in 30 seconds intervals. (Make sure graph is reset not just list)
-Add custom HTML: favicon, title, etc. Might be weird cause Dash has its own HTML thing going on
-Is it necessary to return layout in every period?
-Clean code
-Deploy using flask , docker , nginx on EC2. Should probably load own instance of flask into app.
'''
type = "BTC"
count = 0
def get_time():
hour = str(dt.datetime.now().hour)
minute = str(dt.datetime.now().minute)
if int(minute) < 10:
minute = "0"+minute
return hour+":"+minute
bg_colour = '#e7e5e2'
sec_colour = '#38474e'
tick_colour = '#3ed5a0'
interval = 30 * 1000 # In milliseconds
x = []
y_btc = []
def data_type():
y_btc.append(data.api_data()["btc_price"])
x.append(((len(y_btc)-1)/2))
layout = go.Layout(title=type + '/ZAR',
titlefont={'family': 'MainFont',
'size': 36, 'color': sec_colour},
xaxis={'title': 'Time (Minutes)', 'tickangle': 45,
'color': sec_colour, "showticklabels": True, },
yaxis={'title': 'Price', 'color': sec_colour},
plot_bgcolor=bg_colour,
paper_bgcolor=bg_colour,
)
app = dash.Dash(__name__, static_folder='assets')
app.scripts.config.serve_locally = True
app.css.config.serve_locally = True
server = app.server
app.layout = html.Div(children=[
html.Link(href='/assets/main.css', rel='stylesheet'),
html.H1(children='Price', id="price"),
html.H1(children='% Change', id="percent_change"),
html.H2(children=get_time(), id="time"),
dcc.Interval(
id='interval-component',
interval=interval,
n_intervals=0
),
dcc.Interval(
id='title-time',
interval=interval,
n_intervals=1
),
dcc.Graph(
id='ticker',
figure={
'data': [
],
'layout': [
layout
]
}
),
])
@app.callback(Output('ticker', 'figure'),
[Input('interval-component', 'n_intervals')])
def update_output_heading(time):
print(len(y_btc))
if(len(y_btc) >= 120): # Resets graph hourly
x.clear()
y_btc.clear()
trace_btc = go.Scatter(
x=[],
y=[],
)
data_type()
trace_btc = go.Scatter(
x=x,
y=y_btc,
name='Price',
line=dict(
color=tick_colour,
width=2,
),
),
return{
'data': trace_btc,
'layout': layout,
}
@app.callback(Output('price', 'children'),
[Input('title-time', 'n_intervals')])
def updatePrice(time):
latest_price = "R" + str(y_btc[-1])
return latest_price
@app.callback(Output('percent_change', 'children'),
[Input('title-time', 'n_intervals')])
def updateChange(time):
change = round((((y_btc[-1] / y_btc[0]) - 1) * 100), 2)
change = str(change) + "%"
return change
@app.callback(Output('time', 'children'),
[Input('title-time', 'n_intervals')])
def updateTime(time):
time = get_time()
return time
if __name__ == '__main__':
app.run_server(debug=True, port=5300)