Inter-Line Coloring

pythondemo\linefill.py
#!/usr/bin/python

# The ChartDirector for Python module is assumed to be in "../lib"
import sys, os
sys.path.insert(0, os.path.join(os.path.abspath(sys.path[0]), "..", "lib"))

from pychartdir import *

# The data for the line chart
data0 = [70, 73, 80, 90, 95, 93, 82, 77, 82, 101, 111, 115]
data1 = [90, 96, 89, 77, 82, 96, 109, 109, 99, 108, 96, 91]
data2 = [58, 34, 25, 49, 64, 10, 16, 40, 25, 49, 40, 22]

# The labels for the line chart
labels = ["2008-01", "2008-02", "2008-03", "2008-04", "2008-05", "2008-06", "2008-07", "2008-08",
    "2008-09", "2008-10", "2008-11", "2008-12"]

# Create a XYChart object of size 450 x 450 pixels
c = XYChart(450, 450)

# Add a title to the chart using 15pt Arial Italic font.
title = c.addTitle("Inter-line Coloring", "Arial Italic", 15)

# Add a legend box where the top-center is anchored to the horizontal center of the chart, just
# under the title. Use horizontal layout and 10 points Arial Bold font, and transparent background
# and border. Use line style legend key.
legendBox = c.addLegend(c.getWidth() / 2, title.getHeight(), 0, "Arial Bold Italic", 10)
legendBox.setBackground(Transparent, Transparent)
legendBox.setAlignment(TopCenter)
legendBox.setLineStyleKey()

# Tentatively set the plotarea at (70, 65) and of (chart_width - 100) x (chart_height - 110) in
# size. Use light grey (c0c0c0) border and horizontal and vertical grid lines.
plotArea = c.setPlotArea(70, 65, c.getWidth() - 100, c.getHeight() - 110, -1, -1, 0xc0c0c0,
    0xc0c0c0, -1)

# Add a title to the y axis using 12pt Arial Bold Italic font
c.yAxis().setTitle("Axis Title Placeholder", "Arial Bold Italic", 12)

# Add a title to the x axis using 12pt Arial Bold Italic font
c.xAxis().setTitle("Axis Title Placeholder", "Arial Bold Italic", 12)

# Set the axes line width to 3 pixels
c.xAxis().setWidth(3)
c.yAxis().setWidth(3)

# Set the labels on the x axis.
c.xAxis().setLabels(labels)

# Use 8 points Arial rotated by 90 degrees as the x-axis label font
c.xAxis().setLabelStyle("Arial", 8, TextColor, 90)

# Add a spline curve to the chart
layer0 = c.addSplineLayer(data0, 0xff0000, "Data Set 0")
layer0.setLineWidth(2)

# Add a normal line to the chart
layer1 = c.addLineLayer(data1, 0x008800, "Data Set 1")
layer1.setLineWidth(2)

# Color the region between the above spline curve and normal line. Use the semi-transparent red
# (80ff000000) if the spline curve is higher than the normal line, otherwise use semi-transparent
# green (80008800)
c.addInterLineLayer(layer0.getLine(), layer1.getLine(), 0x80ff0000, 0x80008800)

# Add another normal line to the chart
layer2 = c.addLineLayer(data2, 0x0000ff, "Data Set 2")
layer2.setLineWidth(2)

# Add a horizontal mark line to the chart at y = 40
mark = c.yAxis().addMark(40, -1, "Threshold")
mark.setLineWidth(2)

# Set the mark line to purple (880088) dash line. Use white (ffffff) for the mark label.
mark.setMarkColor(c.dashLineColor(0x880088), 0xffffff)

# Put the mark label at the left side of the mark, with a purple (880088) background.
mark.setAlignment(Left)
mark.setBackground(0x880088)

# Color the region between the above normal line and mark line. Use the semi-transparent blue
# (800000ff) if the normal line is higher than the mark line, otherwise use semi-transparent purple
# (80880088)
c.addInterLineLayer(layer2.getLine(), mark.getLine(), 0x800000ff, 0x80880088)

# Layout the legend box, so we can get its height
c.layoutLegend()

# Adjust the plot area size, such that the bounding box (inclusive of axes) is 10 pixels from the
# left edge, just under the legend box, 25 pixels from the right edge, and 10 pixels from the bottom
# edge.
c.packPlotArea(10, legendBox.getTopY() + legendBox.getHeight(), c.getWidth() - 25, c.getHeight(
    ) - 10)

# After determining the exact plot area position, we may adjust the legend box and the title
# positions so that they are centered relative to the plot area (instead of the chart)
legendBox.setPos(plotArea.getLeftX() + (plotArea.getWidth() - legendBox.getWidth()) / 2,
    legendBox.getTopY())
title.setPos(plotArea.getLeftX() + (plotArea.getWidth() - title.getWidth()) / 2, title.getTopY())

# Output the chart
c.makeChart("linefill.png")