Advanced Graphing

Some explanatory notes soon. This is an article about a script to create axes with tick marks, then plot data points to the scale of the graph.


 * 1) !/usr/bin/env python


 * 1) File: axes_graphing.py
 * 2) originally 2006.05.17 as graph2.py on Scribus wiki
 * 3) this version 2010.07.25
 * 4) creates graph with axes and plots Y values
 * 5) X values are fixed

""" This script as written assumes a US Letter page in landscape orientation. The various position and dimension values you see are appropriate for page units of points. If you prefer other units, there are commands to get your units type, switch to points, and then at the end back to your preferred units. No headers are created and even the axis labels are not part of this script. It was written to plot events over a 24 hour day, so the X axis denotes hours (i.e., 24 tick points), and the Y axis number of events.

The only user input when the script runs is to specify the range of the Y axis, and indicate the value of individual tick marks. The reason for not making this automatic is that you might wish to have a family of graphs with a range of values from graph to graph, yet keep the same scale.

This having been said, nothing will plot unless the script has values for the yvalue list. Some arbitrary values are shown below. With a bit more work, you might load these values from a file or value dialog(s).

"""

import scribus

xorigin = 64     # x-origin of graph yorigin = 536    # y-origin of graph xaxis=637        #x axis length yaxis=408        #y axis length color="Black" a = 1.5 # width of lines l = 2.0 t = 0.8 # width of scale markers xvalue = [] yvalue = [1,1,4,2,1,0,1,1,4,1,7,2,3,4,4,2,7,5,5,5,5,4,3,2] # graph points polyvalue = [] if scribus.haveDoc: xtick = xorigin xscale = xaxis/24 # this gives you typographic points per data unit yrange = int(scribus.valueDialog('Maximum Y Scale', 'Enter Top Y Value\n(Scale)')) ymark = int(scribus.valueDialog('Tick Mark Interval', 'Enter Y Interval for Tick Marks')) ytick = yorigin yscale = yaxis/yrange # this gives you typographic points per data unit scribus.setRedraw(1) scribus.setUnit(0) d = scribus.createLine(xorigin,yorigin,xorigin+xaxis,yorigin) # create X axis scribus.setLineWidth(a, d)   scribus.setLineColor(color, d)    scribus.setFillColor(color, d)    e = scribus.createLine(xorigin,yorigin,xorigin,yorigin-yaxis) # create Y axis scribus.setLineWidth(a, e)   scribus.setLineColor(color, e)    scribus.setFillColor(color, e)    ytick = ytick - ymark * yscale nticks = 0 item = 0 while (nticks < 24): xtick = xtick + xscale xvalue.append(xtick) xt = scribus.createLine(xtick, yorigin, xtick, yorigin + 5) # creating X axis tick lines scribus.setLineWidth(t, xt) scribus.setLineColor(color, xt) scribus.setFillColor(color, xt) nticks += 1 while (ytick > (yorigin - yaxis)): yt = scribus.createLine(xorigin, ytick, xorigin - 5, ytick) # creating Y axis tick lines scribus.setLineWidth(t, yt) scribus.setLineColor(color, yt) scribus.setFillColor(color, yt) ytick = ytick - ymark * yscale while (item < 24): # this interleaves the X and Y data for createPolyLine polyvalue.append(xvalue[item]) polyvalue.append((yorigin - yvalue[item] * yscale)) item += 1 poly = scribus.createPolyLine(polyvalue) # this is the actual plotting scribus.setLineWidth(l, poly) scribus.setLineColor(color, poly) scribus.setFillColor("None",poly)

scribus.redrawAll