From caf04a111d5338990d50b179e657c6fe3bc29036 Mon Sep 17 00:00:00 2001
From: Christopher Stone <cedstone@lithoi.org.uk>
Date: Thu, 8 Feb 2018 19:47:59 +0000
Subject: [PATCH] Demo code now draws graph of randomly chosen numbers - but is driven by redraw events, rather than incoming serial data

---
 telemetry/code/monitor/pyglet_test.py | 29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/telemetry/code/monitor/pyglet_test.py b/telemetry/code/monitor/pyglet_test.py
index 1c6eb5e..e03abb5 100644
--- a/telemetry/code/monitor/pyglet_test.py
+++ b/telemetry/code/monitor/pyglet_test.py
@@ -1,8 +1,12 @@
 import pyglet
 import math
+import random
+import time
  
 window = pyglet.window.Window()
 window.set_caption("Test graph")
+
+starttime = time.time()
  
 title = pyglet.text.Label('Test Graph',
                           font_name='Arkhip',
@@ -15,6 +19,7 @@ def round_sig(x, sig=2):
     return round(x, sig-int(math.floor(math.log10(abs(x))))-1)
                  
 def drawgrid(xlines, ylines, xlimits, ylimits):
+    pyglet.gl.glColor4f(0.5, 0.5, 0.5, 1.0) 
     for xpos in range(0, window.width, window.width/xlines):
         pyglet.graphics.draw(2, pyglet.gl.GL_LINES, ('v2i', (xpos, 0, xpos, window.height)))
         tagtext = str(round((xlimits[1]-xlimits[0])*(float(xpos)/window.width), 1))
@@ -28,15 +33,33 @@ def drawgrid(xlines, ylines, xlimits, ylimits):
 
 
 def plotline(xdata, ydata):
-    pass
+    pyglet.gl.glColor4f(1, 0, 0, 1.0)
+    points = []
+    for n in range(max(len(xdata), len(ydata))):
+        xpos = ((xdata[n]-min(xdata))*window.width)/(max(xdata)-min(xdata))
+        xpos = int(xpos)
+        ypos = ((ydata[n]-min(ydata))*window.height)/(max(ydata)-min(ydata))
+        ypos = int(ypos)
+        points.append([xpos, ypos])
+    for n in range(len(points)-1):            
+        pyglet.graphics.draw(2, pyglet.gl.GL_LINES, ('v2i', (points[n][0], points[n][1], points[n+1][0], points[n+1][1])))
+
 
+xdata = [0]
+ydata = [0]
 
-xdata = [1, 2, 3, 4, 5, 6, 7, 7.4, 9, 10]
-ydata = [81, 86, 58, 20, 59, 3, -6, 4.8]
 
 @window.event
 def on_draw():
     window.clear()
+    ydata.append(random.uniform(0, 10))
+    if len(ydata) > 100:
+        del ydata[0]
+    xdata.append(round(time.time() - starttime, 3))
+    if len(xdata) > 100:
+        del xdata[0]
     drawgrid(10, 12, [min(xdata), max(xdata)], [min(ydata), max(ydata)])
+    plotline(xdata, ydata)
+
     
 pyglet.app.run()
\ No newline at end of file
--
libgit2 0.21.2