Creating a Graph, Part 2

This page will start with the script graph.py, and create a new graph2.py to add some additional features.

graph.py makes a simple graph with X and Y axes, labels for the axes, and a title. With graph2.py we will add the ability to assign a scale to the axes, make user-defined tick marks, and then give some feed back about the typographic features of this graph.

New requestors

    xrange = int(scribus.valueDialog('Maximum X Scale', 'Enter Top X Value\n(Scale)'))
    xmark = int(scribus.valueDialog('Tick Mark Interval', 'Enter X Interval for Tick Marks'))

The first asks for the value for the total X axis in the units of the graph (no need to name to units here). The second asks for the number of units between tick marks on the X axis scale.

From this we can calculate a typographic scale for our graph, using the fact that we have set the width of the graph with the variable xaxis:

    xscale = xaxis/xrange # this give you data units per axis value in points

#!/usr/bin/env python

# File: graph2.py
# originally 2006.05.17
# this version 2006.05.18
# creates basic graph with axis labels

import scribus

xorigin = 150      # x-origin of graph
yorigin = 450     # y-origin of graph
xaxis=400      #x axis length
yaxis=350      #y axis length
color="Black"
a = 1.5 # width of lines
t = 0.8 # width of scale markers
if scribus.haveDoc():
    title = scribus.valueDialog('Title','Enter Title')
    xlabel = scribus.valueDialog('X-axis Label','Enter X-Label')
    ylabel = scribus.valueDialog('Y-axis Label','Enter Y-Label')
    xrange = int(scribus.valueDialog('Maximum X Scale', 'Enter Top X Value\n(Scale)'))
    xmark = int(scribus.valueDialog('Tick Mark Interval', 'Enter X Interval for Tick Marks'))
    xtick = xorigin
    xscale = xaxis/xrange # this give you data units per axis value in points
    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 give you data units per axis value in points
    scribus.setRedraw(1)
    scribus.setUnit(0)
    d = scribus.createLine(xorigin,yorigin,xorigin+xaxis,yorigin)
    scribus.setLineWidth(a, d)
    scribus.setLineColor(color, d)
    scribus.setFillColor(color, d)
    e = scribus.createLine(xorigin,yorigin,xorigin,yorigin-yaxis)
    scribus.setLineWidth(a, e)
    scribus.setLineColor(color, e)
    scribus.setFillColor(color, e)
    xtick = xtick + xmark * xscale
    ytick = ytick - ymark * yscale
    while (xtick < (xorigin + xaxis)):
        xt = scribus.createLine(xtick, yorigin, xtick, yorigin - 10)
        scribus.setLineWidth(t, xt)
        scribus.setLineColor(color, xt)
        scribus.setFillColor(color, xt)
        xtick = xtick + xmark * xscale
    while (ytick > (yorigin - yaxis)):
        yt = scribus.createLine(xorigin, ytick, xorigin + 10, ytick)
        scribus.setLineWidth(t, yt)
        scribus.setLineColor(color, yt)
        scribus.setFillColor(color, yt)
        ytick = ytick - ymark * yscale
    T = scribus.createText(60, 45, 500, 60)
    scribus.setTextColor("Red", T)
    scribus.setText(title, T)
    scribus.setTextAlignment(1, T)
    scribus.setFont("Nimbus Roman No9 L Bold", T)
    scribus.setFontSize(28, T)
    XL = scribus.createText(xorigin, yorigin + 20, 400, 40)
    scribus.setText(xlabel, XL)
    scribus.setTextAlignment(1, XL)
    scribus.setFont("Luxi Sans Regular", XL)
    scribus.setFontSize(20, XL)
    YL = scribus.createText(90, 450, 350, 40)
    scribus.setText(ylabel, YL)
    scribus.setTextAlignment(1, YL)
    scribus.setFont("Luxi Sans Regular", YL)
    scribus.setFontSize(20, YL)
    scribus.rotateObject(90,YL)
    caption = "Scale for this graph\n\n" "X: " + str(xmark) + "units/mark\n" + "Y: " + str(ymark) + "units/mark\n" + str(xmark) + " units = " + str(xscale * xmark) + " pts (X)\n" + str(ymark) + " units = " + str(yscale * ymark) + " pts (Y)"
    S = scribus.createText(200, 120, 150, 80)
    scribus.setTextColor("Blue", S)
    scribus.setText(caption, S)
    scribus.setTextAlignment(1, S)
    scribus.setFont("Nimbus Roman No9 L Bold", S)
    scribus.setFontSize(8, S)


    scribus.redrawAll()