Basic webapp

app.py

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+import dash
+import dash_core_components as dcc
+import dash_html_components as html
+from dash.dependencies import Input, Output
+import dash_table_experiments as dt
+
+import numpy as np
+import flask
+
+import base64
+from io import StringIO
+import sys
+import os.path
+
+sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__),os.path.pardir,'orbitdeterminator')))
+
+from kep_determination.ellipse_fit import determine_kep
+
+app = dash.Dash()
+
+# setup static folder
+STATIC_PATH = os.path.abspath(os.path.join(os.path.dirname(__file__), 'static'))
+
+@app.server.route('/static/<resource>')
+def serve_static(resource):
+    return flask.send_from_directory(STATIC_PATH, resource)
+
+app.css.append_css({'external_url': '/static/style.css'})
+
+app.layout = html.Div(children=[
+
+    html.Img(src='/static/logo.png',id='logo'),
+
+    html.H1(children='Orbit Determinator'),
+
+    html.Div('''
+        Orbit Determinator: A python package to predict satellite orbits.''',id='subtitle'),
+
+    html.Div('''Upload a csv file below'''),
+
+    html.Div(id='upload-box',
+        children=dcc.Upload(id='file-upload',
+            children=html.Div([
+                'Drag and Drop or ',
+                html.A('click to select a file')
+            ]),
+            multiple=False)),
+
+    html.Div(id='output-div',children=[dt.DataTable(rows=[{}])])
+])
+
+def parse_file(file_content):
+    try:
+        file_content = file_content.split(',')[1]
+        decoded = base64.b64decode(file_content).decode('ascii')
+        _data = np.loadtxt(StringIO(decoded),skiprows=1)
+        assert(_data.shape[1] == 4)
+        return _data
+    except Exception as e:
+        print(e)
+        return np.empty((0,4))
+
+@app.callback(Output('output-div','children'),
+              [Input('file-upload','contents'),
+               Input('file-upload','filename')])
+
+def display_file(file_content, file_name):
+
+    if file_content is None:
+        return html.Div(['Choose a file to display its contents.'])
+
+    data = parse_file(file_content)
+    if (data.shape[0] > 0):
+        data_dict = [{'No.':'{:03d}'.format(i+1), 't':data[i][0], 'x':data[i][1], 'y':data[i][2], 'z':data[i][3]} for i in range(data.shape[0])]
+        kep, res = determine_kep(data[:,1:])
+
+        return [html.Div(children=file_name, className='section-titles'),
+
+            dt.DataTable(rows=data_dict,editable=False),
+
+            html.Div(children='Computed Keplerian Elements', className='section-titles'),
+
+            dt.DataTable(rows=[
+                {'Element':'Semi-major Axis',
+                 'Value'            :str(kep[0][0])},
+                {'Element':'Eccentricity',
+                 'Value'            :str(kep[1][0])},
+                {'Element':'Inclination',
+                 'Value'            :str(kep[2][0])},
+                {'Element':'Argument of Periapsis',
+                 'Value'            :str(kep[3][0])},
+                {'Element':'Right Ascension of Ascending Node',
+                 'Value'            :str(kep[4][0])},
+                {'Element':'True Anomaly',
+                 'Value'            :str(kep[5][0])},
+                ],editable=False),
+
+            dcc.Graph(id='orbit-plot',
+                figure={
+                    'data':[{'x':data[:,1],'y':data[:,2],'z':data[:,3],'mode':'markers','type':'scatter3d','marker':{
+                        'size':2,
+                        'opacity':0.8
+                        }}],
+                    'layout':{
+                        'height': 600
+                        }
+                    })]
+    else:
+        return html.Div('''There was an error processing this file.''')
+
+if __name__ == '__main__':
+    app.run_server(debug=True)

requirements.txt

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+certifi==2018.4.16
+chardet==3.0.4
+click==6.7
+cycler==0.10.0
+dash==0.21.1
+dash-core-components==0.23.0
+dash-html-components==0.10.1
+dash-renderer==0.12.1
+dash-table-experiments==0.6.0
+decorator==4.3.0
+Flask==1.0.2
+Flask-Compress==1.4.0
+idna==2.6
+ipython-genutils==0.2.0
+itsdangerous==0.24
+Jinja2==2.10
+jsonschema==2.6.0
+jupyter-core==4.4.0
+kiwisolver==1.0.1
+MarkupSafe==1.0
+matplotlib==2.2.2
+nbformat==4.4.0
+numpy==1.14.3
+plotly==2.7.0
+pyparsing==2.2.0
+python-dateutil==2.7.3
+pytz==2018.4
+requests==2.18.4
+scipy==1.1.0
+six==1.11.0
+traitlets==4.3.2
+urllib3==1.22
+Werkzeug==0.14.1

static/style.css

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+html {
+    padding: 0 1em;
+}
+
+._dash-undo-redo {
+  display: none;
+}
+
+#logo {
+    float: right;
+    max-height: 5em;
+}
+
+#subtitle {
+    margin-top: -0.5em;
+    margin-bottom: 3em;
+}
+
+#upload-box {
+    margin: 0.7em 0;
+    padding: 1em;
+    border: dashed 1px;
+    border-radius: 5px;
+    text-align: center;
+}
+
+.section-titles {
+    font-weight: bold;
+    padding: 0.5em;
+}