from svg.charts import pie import math from lxml import etree def createPie(data, gaps = 0): total = sum(data.values()) colours = ['#268ED7','#6A4F8D', '#A03D4F','#DC7432','#F6DC3B','#76B33B', '#267B60'] className = "hoverTitles" if len(data) > 9 else "" svg = '' % className numbers = "" position = 90 i = 0 for e in sorted(data.keys()): data[e] = data[e] / total arc = data[e] * 360.; diff = polarToCartesian(0,0,5, position+0.5*arc) if gaps > 0 else {'x':0, 'y': 0} d = describeArc(float(diff['x']), float(diff['y']), 60, position, position+arc) # print(position, arc) svg += '' % (colours[i%len(colours)], d) # tRadius = 105 if i%2 else 95 t = polarToCartesian(0,0, 100, position+0.5*arc) svg += '%s' % (t['x'], t['y'], position+0.5*arc, t['x'],t['y'], e) position += arc i+=1 svg += numbers svg += "" return svg # data is now in fractions def polarToCartesian(centerX, centerY, radius, angleInDegrees): """ Adapted from http://stackoverflow.com/a/18473154 """ angleInRadians = (angleInDegrees - 90) * math.pi / 180.0; return { "x": str(centerX + (radius * math.cos(angleInRadians))), "y": str(centerY + (radius * math.sin(angleInRadians))) } def describeArc(x, y, radius, startAngle, endAngle): """ Adapted from http://stackoverflow.com/a/18473154 """ start = polarToCartesian(x, y, radius, endAngle) end = polarToCartesian(x, y, radius, startAngle) largeArcFlag = "0" if endAngle - startAngle <= 180 else "1"; d = " ".join([ "M", start['x'], start['y'], "A", str(radius), str(radius), "0", largeArcFlag, "0", end['x'], end['y'] ]); return d # g = pie.Pie({}) # options = dict( # width=640, # height=480, # fields=list(data.keys()), # graph_title='Question 7', # # expand_greatest = True, # show_data_labels = True, # compress=False, # css_inline=True, # ) # g.__dict__.update(options) # g.add_data({'data': list(data.values()), 'title': 'Female'}) # # g.add_data({'data': [0, 2, 1, 5, 4], 'title': 'Male'}) # return str(g.burn())