move plot plugin to lib; plot histograms

lib/plot.py

@@ -0,0 +1,58 @@
+from PyQt4.QtGui import *
+from electrum.i18n import _
+
+
+import datetime
+from collections import defaultdict
+
+from electrum.util import format_satoshis
+from electrum.bitcoin import COIN
+
+import matplotlib
+matplotlib.use('Qt4Agg')
+import matplotlib.pyplot as plt
+import matplotlib.dates as md
+from matplotlib.patches import Ellipse
+from matplotlib.offsetbox import AnchoredOffsetbox, TextArea, DrawingArea, HPacker
+
+
+def plot_history(wallet, history):
+    hist_in = defaultdict(int)
+    hist_out = defaultdict(int)
+    for item in history:
+        tx_hash, height, confirmations, timestamp, value, balance = item
+        if not confirmations:
+            continue
+        if timestamp is None:
+            continue
+        value = value*1./COIN
+        date = datetime.datetime.fromtimestamp(timestamp)
+        datenum = int(md.date2num(datetime.date(date.year, date.month, 1)))
+        if value > 0:
+            hist_in[datenum] += value
+        else:
+            hist_out[datenum] -= value
+
+    f, axarr = plt.subplots(2, sharex=True)
+    plt.subplots_adjust(bottom=0.2)
+    plt.xticks( rotation=25 )
+    ax=plt.gca()
+
+    plt.ylabel('BTC')
+    plt.xlabel('Dates')
+    xfmt = md.DateFormatter('%Y-%m-%d')
+    ax.xaxis.set_major_formatter(xfmt)
+
+    axarr[0].set_title('History Transactions')
+
+    xfmt = md.DateFormatter('%Y-%m')
+    ax.xaxis.set_major_formatter(xfmt)
+    width = 20
+    dates, values = zip(*sorted(hist_in.items()))
+    r1 = axarr[0].bar(dates, values, width, label='incoming')
+    axarr[0].legend(loc='upper left')
+    dates, values = zip(*sorted(hist_out.items()))
+    r2 = axarr[1].bar(dates, values, width, color='r', label='outgoing')
+    axarr[1].legend(loc='upper left')
+    #   plt.annotate('unknown transaction = %d \n pending transactions = %d' %(unknown_trans,pending_trans),xy=(0.7,0.05),xycoords='axes fraction',size=12)
+    return plt