{"id":1145,"date":"2012-06-02T18:47:43","date_gmt":"2012-06-02T23:47:43","guid":{"rendered":"http:\/\/rud.is\/b\/?p=1145"},"modified":"2012-06-03T08:24:08","modified_gmt":"2012-06-03T13:24:08","slug":"slopegraphs-in-python-the-great-refactor","status":"publish","type":"post","link":"https:\/\/rud.is\/b\/2012\/06\/02\/slopegraphs-in-python-the-great-refactor\/","title":{"rendered":"Slopegraphs in Python \u2013 The Great Refactor"},"content":{"rendered":"

Despite being on holiday, I had a spare hour to refactor the code (@mrshrbrmstr was joining the 1% in the hotel spa). It’s up on github<\/a> and now sports a spiffy JSON-format config file. You now must execute the slopegraph.py<\/code> script with a “--config FILENAME<\/code>” argument. The configuration file lets you specify the “theme” as well as the input file and output format (you can only use PDF for the moment).<\/p>\n

Here’s a sample config file included in the github push (there’s another one there too):<\/p>\n

{\r\n\r\n\"font_family\" : \"Palatino\",\r\n\"font_size\" : \"20\",\r\n\r\n\"x_margin\" : \"20\",\r\n\"y_margin\" : \"30\",\r\n\r\n\"line_width\" : \"0.5\",\r\n\r\n\"background_color\" : \"DEC299\",\r\n\"label_color\" : \"687D64\",\r\n\"value_color\" : \"949258\",\r\n\"slope_color\" : \"61514C\",\r\n\r\n\"value_format_string\" : \"%2d\",\r\n\r\n\"input\" : \"television.csv\",\r\n\"output\" : \"television\",\r\n\"format\" : \"pdf\"\r\n\r\n}<\/pre>\n
Included in the refactor is the ability to use a sprintf<\/code>-like format string for the label value output to make the slopegraphs a tad prettier. Also included with the refactor is a new limitation of the CSV file requiring a<\/p>\n
\"LABEL, VALUE, VALUE\"<\/code><\/p>\n
format in preparation for support for multiple columns. As @jayjacobs said to me, it’s easy to reformat data into the CSV file format, and, he’s right (as usual).<\/p>\n
Plans for the next revision include:<\/p>\n
    \n
  • Specifying a transparent background<\/li>\n
  • Specifying PDF|PS|SVG|PNG format output<\/li>\n
  • Allowing for an arbitrary number of columns for the slopegraph<\/li>\n
  • Optional column labels as well as slopepgraph title (with themeing)<\/li>\n
  • Line color change by slope up\/same\/down value (will most likely be pushed out, tho)<\/li>\n<\/ul>\n
    Here’s the whole source:<\/p>\n
    import csv\r\nimport cairo\r\nimport argparse\r\nimport json\r\n\t\r\ndef split(input, size):\r\n\treturn [input[start:start+size] for start in range(0, len(input), size)]\r\n\r\nclass Slopegraph:\r\n\r\n\tSLOPEGRAPH_CANVAS_SIZE = 300\r\n\r\n\tstarts = {} # starting \"points\"\r\n\tends = {} # ending \"points\"\r\n\tpairs = [] # base pair array for the final plotting\r\n\t\r\n\tdef readCSV(self, filename):\r\n\t\r\n\t\tslopeReader = csv.reader(open(filename, 'rb'), delimiter=',', quotechar='\"')\r\n\t\r\n\t\tfor row in slopeReader:\r\n\t\t\r\n\t\t\t# add chosen values (need start\/end for each CSV row) to the final plotting array.\r\n\t\t\t\r\n\t\t\tlab = row[0] # label\r\n\t\t\tbeg = float(row[1]) # left vals\r\n\t\t\tend = float(row[2]) # right vals\r\n\t\t\t\r\n\t\t\tself.pairs.append( (float(beg), float(end)) )\r\n\t\t\r\n\t\t\t# combine labels of common values into one string\r\n\t\t\r\n\t\t\tif beg in self.starts:\r\n\t\t\t\tself.starts[beg] = self.starts[beg] + \"; \" + lab\r\n\t\t\telse:\r\n\t\t\t\tself.starts[beg] = lab\r\n\t\t\t\r\n\t\t\r\n\t\t\tif end in self.ends:\r\n\t\t\t\tself.ends[end] = self.ends[end] + \"; \" + lab\r\n\t\t\telse:\r\n\t\t\t\tself.ends[end] = lab\r\n\r\n\r\n\tdef sortKeys(self):\r\n\t\r\n\t\t# sort all the values (in the event the CSV wasn't) so\r\n\t\t# we can determine the smallest increment we need to use\r\n\t\t# when stacking the labels and plotting points\r\n\t\t\r\n\t\tself.startSorted = [(k, self.starts[k]) for k in sorted(self.starts)]\r\n\t\tself.endSorted = [(k, self.ends[k]) for k in sorted(self.ends)]\r\n\t\t\r\n\t\tself.startKeys = sorted(self.starts.keys())\r\n\t\tself.delta = max(self.startSorted)\r\n\t\tfor i in range(len(self.startKeys)):\r\n\t\t\tif (i+1 <= len(self.startKeys)-1):\r\n\t\t\t\tcurrDelta = float(self.startKeys[i+1]) - float(self.startKeys[i])\r\n\t\t\t\tif (currDelta < self.delta):\r\n\t\t\t\t\tself.delta = currDelta\r\n\t\t\t\t\t\r\n\t\tself.endKeys = sorted(self.ends.keys())\r\n\t\tfor i in range(len(self.endKeys)):\r\n\t\t\tif (i+1 <= len(self.endKeys)-1):\r\n\t\t\t\tcurrDelta = float(self.endKeys[i+1]) - float(self.endKeys[i])\r\n\t\t\t\tif (currDelta < self.delta):\r\n\t\t\t\t\tself.delta = currDelta\r\n\r\n\r\n\tdef findExtremes(self):\r\n\t\r\n\t\t# we also need to find the absolute min & max values\r\n\t\t# so we know how to scale the plots\r\n\t\t\r\n\t\tself.lowest = min(self.startKeys)\r\n\t\tif (min(self.endKeys) < self.lowest) : self.lowest = min(self.endKeys)\r\n\t\t\r\n\t\tself.highest = max(self.startKeys)\r\n\t\tif (max(self.endKeys) > self.highest) : self.highest = max(self.endKeys)\r\n\t\t\r\n\t\tself.delta = float(self.delta)\r\n\t\tself.lowest = float(self.lowest)\r\n\t\tself.highest = float(self.highest)\r\n\r\n\t\r\n\tdef calculateExtents(self, filename, format, valueFormatString):\r\n\t\r\n\t\tsurface = cairo.PDFSurface (filename, 8.5*72, 11*72)\r\n\t\tcr = cairo.Context (surface)\r\n\t\tcr.save()\r\n\t\tcr.select_font_face(self.FONT_FAMILY, cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_NORMAL)\r\n\t\tcr.set_font_size(self.FONT_SIZE)\r\n\t\tcr.set_line_width(self.LINE_WIDTH)\r\n\t\t\r\n\t\t# find the *real* maximum label width (not just based on number of chars)\r\n\t\t\r\n\t\tmaxLabelWidth = 0\r\n\t\tmaxNumWidth = 0\r\n\t\t\r\n\t\tfor k in sorted(self.startKeys):\r\n\t\t\ts1 = self.starts[k]\r\n\t\t\txbearing, ybearing, self.sWidth, self.sHeight, xadvance, yadvance = (cr.text_extents(s1))\r\n\t\t\tif (self.sWidth > maxLabelWidth) : maxLabelWidth = self.sWidth\r\n\t\t\txbearing, ybearing, self.startMaxLabelWidth, startMaxLabelHeight, xadvance, yadvance = (cr.text_extents(valueFormatString % (k)))\r\n\t\t\tif (self.startMaxLabelWidth > maxNumWidth) : maxNumWidth = self.startMaxLabelWidth\r\n\t\t\r\n\t\tself.sWidth = maxLabelWidth\r\n\t\tself.startMaxLabelWidth = maxNumWidth\r\n\t\t\r\n\t\tmaxLabelWidth = 0\r\n\t\tmaxNumWidth = 0\r\n\t\t\r\n\t\tfor k in sorted(self.endKeys):\r\n\t\t\te1 = self.ends[k]\r\n\t\t\txbearing, ybearing, self.eWidth, eHeight, xadvance, yadvance = (cr.text_extents(e1))\r\n\t\t\tif (self.eWidth > maxLabelWidth) : maxLabelWidth = self.eWidth\r\n\t\t\txbearing, ybearing, self.endMaxLabelWidth, endMaxLabelHeight, xadvance, yadvance = (cr.text_extents(valueFormatString % (k)))\r\n\t\t\tif (self.endMaxLabelWidth > maxNumWidth) : maxNumWidth = self.endMaxLabelWidth\r\n\t\t\r\n\t\tself.eWidth = maxLabelWidth\r\n\t\tself.endMaxLabelWidth = maxNumWidth\t\r\n\t\t\r\n\t\tcr.restore()\r\n\t\tcr.show_page()\r\n\t\tsurface.finish()\r\n\t\t\r\n\t\tself.width = self.X_MARGIN + self.sWidth + self.SPACE_WIDTH + self.startMaxLabelWidth + self.SPACE_WIDTH + self.SLOPEGRAPH_CANVAS_SIZE + self.SPACE_WIDTH + self.endMaxLabelWidth + self.SPACE_WIDTH + self.eWidth + self.X_MARGIN ;\r\n\t\tself.height = (self.Y_MARGIN * 2) + (((self.highest - self.lowest) \/ self.delta) * self.LINE_HEIGHT)\r\n\t\t\r\n\t\t\r\n\tdef makeSlopegraph(self, filename, config):\r\n\t\r\n\t\t(lab_r,lab_g,lab_b) = split(config[\"label_color\"],2)\r\n\t\t(val_r,val_g,val_b) = split(config[\"value_color\"],2)\r\n\t\t(line_r,line_g,line_b) = split(config[\"slope_color\"],2)\r\n\t\t(bg_r,bg_g,bg_b) = split(config[\"background_color\"],2)\r\n\t\t\r\n\t\tLAB_R = (int(lab_r, 16)\/255.0)\r\n\t\tLAB_G = (int(lab_g, 16)\/255.0)\r\n\t\tLAB_B = (int(lab_b, 16)\/255.0)\r\n\t\t\r\n\t\tVAL_R = (int(val_r, 16)\/255.0)\r\n\t\tVAL_G = (int(val_g, 16)\/255.0)\r\n\t\tVAL_B = (int(val_b, 16)\/255.0)\r\n\t\t\r\n\t\tLINE_R = (int(line_r, 16)\/255.0)\r\n\t\tLINE_G = (int(line_g, 16)\/255.0)\r\n\t\tLINE_B = (int(line_b, 16)\/255.0)\r\n\t\t\r\n\t\tBG_R = (int(bg_r, 16)\/255.0)\r\n\t\tBG_G = (int(bg_g, 16)\/255.0)\r\n\t\tBG_B = (int(bg_b, 16)\/255.0)\r\n\r\n\t\tsurface = cairo.PDFSurface (filename, self.width, self.height)\r\n\t\tcr = cairo.Context(surface)\r\n\t\t\r\n\t\tcr.save()\r\n\t\t\r\n\t\tcr.select_font_face(self.FONT_FAMILY, cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_NORMAL)\r\n\t\tcr.set_font_size(self.FONT_SIZE)\r\n\t\t\r\n\t\tcr.set_line_width(self.LINE_WIDTH)\r\n\t\t\r\n\t\tcr.set_source_rgb(BG_R,BG_G,BG_B)\r\n\t\tcr.rectangle(0,0,self.width,self.height)\r\n\t\tcr.fill()\r\n\t\t\r\n\t\t# draw start labels at the correct positions\r\n\t\t\r\n\t\tvalueFormatString = config[\"value_format_string\"]\r\n\t\t\r\n\t\tfor k in sorted(self.startKeys):\r\n\t\t\r\n\t\t\tval = float(k)\r\n\t\t\tlabel = self.starts[k]\r\n\t\t\txbearing, ybearing, lWidth, lHeight, xadvance, yadvance = (cr.text_extents(label))\r\n\t\t\txbearing, ybearing, kWidth, kHeight, xadvance, yadvance = (cr.text_extents(valueFormatString % (val)))\r\n\t\t\r\n\t\t\tcr.set_source_rgb(LAB_R,LAB_G,LAB_B)\r\n\t\t\tcr.move_to(self.X_MARGIN + (self.sWidth - lWidth), self.Y_MARGIN + (self.highest - val) * self.LINE_HEIGHT * (1\/self.delta))\r\n\t\t\tcr.show_text(label)\r\n\t\t\t\r\n\t\t\tcr.set_source_rgb(VAL_R,VAL_G,VAL_B)\r\n\t\t\tcr.move_to(self.X_MARGIN + self.sWidth + self.SPACE_WIDTH + (self.startMaxLabelWidth - kWidth), self.Y_MARGIN + (self.highest - val) * self.LINE_HEIGHT * (1\/self.delta))\r\n\t\t\tcr.show_text(valueFormatString % (val))\r\n\t\t\t\r\n\t\t\tcr.stroke()\r\n\t\t\r\n\t\t# draw end labels at the correct positions\r\n\t\t\r\n\t\tfor k in sorted(self.endKeys):\r\n\t\t\r\n\t\t\tval = float(k)\r\n\t\t\tlabel = self.ends[k]\r\n\t\t\txbearing, ybearing, lWidth, lHeight, xadvance, yadvance = (cr.text_extents(label))\r\n\t\t\t\t\r\n\t\t\tcr.set_source_rgb(VAL_R,VAL_G,VAL_B)\r\n\t\t\tcr.move_to(self.width - self.X_MARGIN - self.SPACE_WIDTH - self.eWidth - self.SPACE_WIDTH - self.endMaxLabelWidth, self.Y_MARGIN + (self.highest - val) * self.LINE_HEIGHT * (1\/self.delta))\r\n\t\t\tcr.show_text(valueFormatString % (val))\r\n\t\t\r\n\t\t\tcr.set_source_rgb(LAB_R,LAB_G,LAB_B)\r\n\t\t\tcr.move_to(self.width - self.X_MARGIN - self.SPACE_WIDTH - self.eWidth, self.Y_MARGIN + (self.highest - val) * self.LINE_HEIGHT * (1\/self.delta))\r\n\t\t\tcr.show_text(label)\r\n\t\t\r\n\t\t\tcr.stroke()\r\n\t\t\r\n\t\t# do the actual plotting\r\n\t\t\r\n\t\tcr.set_line_width(self.LINE_WIDTH)\r\n\t\tcr.set_source_rgb(LINE_R, LINE_G, LINE_B)\r\n\t\t\r\n\t\tfor s1,e1 in self.pairs:\r\n\t\t\tcr.move_to(self.X_MARGIN + self.sWidth + self.SPACE_WIDTH + self.startMaxLabelWidth + self.LINE_START_DELTA, self.Y_MARGIN + (self.highest - s1) * self.LINE_HEIGHT * (1\/self.delta) - self.LINE_HEIGHT\/4)\r\n\t\t\tcr.line_to(self.width - self.X_MARGIN - self.eWidth - self.SPACE_WIDTH - self.endMaxLabelWidth - self.LINE_START_DELTA, self.Y_MARGIN + (self.highest - e1) * self.LINE_HEIGHT * (1\/self.delta) - self.LINE_HEIGHT\/4)\r\n\t\t\tcr.stroke()\r\n\t\t\r\n\t\tcr.restore()\r\n\t\tcr.show_page()\r\n\t\tsurface.finish()\t\r\n\t\t\r\n\t\r\n\tdef __init__(self, config):\r\n\t\r\n\t\t# a couple methods need these so make them local to the class\r\n\t\r\n\t\tself.FONT_FAMILY = config[\"font_family\"]\r\n\t\tself.LINE_WIDTH = float(config[\"line_width\"])\r\n\t\tself.X_MARGIN = float(config[\"x_margin\"])\r\n\t\tself.Y_MARGIN = float(config[\"y_margin\"])\r\n\t\tself.FONT_SIZE = float(config[\"font_size\"])\r\n\t\tself.SPACE_WIDTH = self.FONT_SIZE \/ 2.0\r\n\t\tself.LINE_HEIGHT = self.FONT_SIZE + (self.FONT_SIZE \/ 2.0)\r\n\t\tself.LINE_START_DELTA = 1.5*self.SPACE_WIDTH\r\n\t\t\r\n\t\tOUTPUT_FILE = config[\"output\"] + \".\" + config[\"format\"]\r\n\t\t\r\n\t\t# process the values & make the slopegraph\r\n\t\t\r\n\t\tself.readCSV(config[\"input\"])\r\n\t\tself.sortKeys()\r\n\t\tself.findExtremes()\r\n\t\tself.calculateExtents(OUTPUT_FILE, config[\"format\"], config[\"value_format_string\"])\r\n\t\tself.makeSlopegraph(OUTPUT_FILE, config)\r\n\t\t\r\n\r\ndef main():\r\n\r\n\tparser = argparse.ArgumentParser(description=\"Creates a slopegraph from a CSV source\")\r\n\tparser.add_argument(\"--config\",required=True,\r\n\t\t\t\t\thelp=\"config file name to use for  slopegraph creation\",)\r\n\targs = parser.parse_args()\r\n\r\n\tif args.config:\r\n\t\r\n\t\tjson_data = open(args.config)\r\n\t\tconfig = json.load(json_data)\r\n\t\tjson_data.close()\r\n\t\t\r\n\t\tSlopegraph(config)\r\n\r\n\treturn(0)\r\n\t\r\nif __name__ == \"__main__\":\r\n\tmain()<\/pre>\n","protected":false},"excerpt":{"rendered":"
    Despite being on holiday, I had a spare hour to refactor the code (@mrshrbrmstr was joining the 1% in the hotel spa). It’s up on github and now sports a spiffy JSON-format config file. You now must execute the slopegraph.py script with a “–config FILENAME” argument. The configuration file lets you specify the “theme” as […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":3,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":""},"categories":[24,63,640],"tags":[751,657,658],"class_list":["post-1145","post","type-post","status-publish","format-standard","hentry","category-charts-graphs","category-development","category-python-2","tag-slopegraph","tag-table-chart","tag-tufte"],"yoast_head":"\nSlopegraphs in Python \u2013 The Great Refactor - rud.is<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rud.is\/b\/2012\/06\/02\/slopegraphs-in-python-the-great-refactor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Slopegraphs in Python \u2013 The Great Refactor - rud.is\" \/>\n<meta property=\"og:description\" content=\"Despite being on holiday, I had a spare hour to refactor the code (@mrshrbrmstr was joining the 1% in the hotel spa). It’s up on github and now sports a spiffy JSON-format config file. You now must execute the slopegraph.py script with a “--config FILENAME” argument. 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