Start button as well as stop on monitor

Also, 'tidy' analysis

analysis.rmd

 
 This file creates graphs of recorded flight parameters
 
+```{r opts, include=FALSE}
+library(knitr)
+opts_chunk$set(tidy=TRUE)
+```
+
 ```{r init}
 library(ggplot2)
 library(scales)

monitor.py

 rect.position = (110-(screen_size[0]/2), screen_size[1]/2-75)
 
 # Add a button to set the throttle to maximum
-button = panel.add_button("Stop monitor")
+button = panel.add_button("Start monitor")
 button.rect_transform.position = (0, 0)
 
 # Set up a stream to monitor the throttle button
 button_clicked = conn.add_stream(getattr, button, 'clicked')
+
+# Wait for button
+while button_clicked() == False:
+    time.sleep(0.1)
+
+button.remove()
+
+# replace button
+button = panel.add_button("Stop monitor")
+button.rect_transform.position = (0, 0)
+button_clicked = conn.add_stream(getattr, button, 'clicked')
+
 f = open(datafile, 'w')
 f.write('timepoint, current_altitude, v_speed, h_speed, mass, fuel, available_thrust, current_thrust, g_force\n')
 timepoint = 0