ChartDirector 5.1 (Python Edition)

Pattern Area Chart




This example demonstrates using a pattern for filling the area in an area chart, together with a number of chart formatting features.

Source Code Listing

[Standalone Version] pythondemo\patternarea.py
#!/usr/bin/python
from pychartdir import *

# The data for the area chart
data = [3.0, 2.8, 4.0, 5.5, 7.5, 6.8, 5.4, 6.0, 5.0, 6.2, 7.5, 6.5, 7.5, 8.1, 6.0,
    5.5, 5.3, 3.5, 5.0, 6.6, 5.6, 4.8, 5.2, 6.5, 6.2]

# The labels for the area chart
labels = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13",
    "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24"]

# Create a XYChart object of size 300 x 180 pixels. Set the background to pale yellow
# (0xffffa0) with a black border (0x0)
c = XYChart(300, 180, 0xffffa0, 0x000000)

# Set the plotarea at (45, 35) and of size 240 x 120 pixels. Set the background to
# white (0xffffff). Set both horizontal and vertical grid lines to black (&H0&)
# dotted lines (pattern code 0x0103)
c.setPlotArea(45, 35, 240, 120, 0xffffff, -1, -1, c.dashLineColor(0x000000, 0x000103
    ), c.dashLineColor(0x000000, 0x000103))

# Add a title to the chart using 10 pts Arial Bold font. Use a 1 x 2 bitmap pattern
# as the background. Set the border to black (0x0).
c.addTitle("Snow Percipitation (Dec 12)", "arialbd.ttf", 10).setBackground(
    c.patternColor([0xb0b0f0, 0xe0e0ff], 2), 0x000000)

# Add a title to the y axis
c.yAxis().setTitle("mm per hour")

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

# Display 1 out of 3 labels on the x-axis.
c.xAxis().setLabelStep(3)

# Add an area layer to the chart
layer = c.addAreaLayer()

# Load a snow pattern from an external file "snow.png".
snowPattern = c.patternColor2("snow.png")

# Add a data set to the area layer using the snow pattern as the fill color. Use deep
# blue (0x0000ff) as the area border line color (&H0000ff&)
layer.addDataSet(data).setDataColor(snowPattern, 0x0000ff)

# Set the line width to 2 pixels to highlight the line
layer.setLineWidth(2)

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

[CGI Version] pythondemo_cgi\patternarea.py
#!/usr/bin/python
from pychartdir import *
import os

# The data for the area chart
data = [3.0, 2.8, 4.0, 5.5, 7.5, 6.8, 5.4, 6.0, 5.0, 6.2, 7.5, 6.5, 7.5, 8.1, 6.0,
    5.5, 5.3, 3.5, 5.0, 6.6, 5.6, 4.8, 5.2, 6.5, 6.2]

# The labels for the area chart
labels = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13",
    "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24"]

# Create a XYChart object of size 300 x 180 pixels. Set the background to pale yellow
# (0xffffa0) with a black border (0x0)
c = XYChart(300, 180, 0xffffa0, 0x000000)

# Set the plotarea at (45, 35) and of size 240 x 120 pixels. Set the background to
# white (0xffffff). Set both horizontal and vertical grid lines to black (&H0&)
# dotted lines (pattern code 0x0103)
c.setPlotArea(45, 35, 240, 120, 0xffffff, -1, -1, c.dashLineColor(0x000000, 0x000103
    ), c.dashLineColor(0x000000, 0x000103))

# Add a title to the chart using 10 pts Arial Bold font. Use a 1 x 2 bitmap pattern
# as the background. Set the border to black (0x0).
c.addTitle("Snow Percipitation (Dec 12)", "arialbd.ttf", 10).setBackground(
    c.patternColor([0xb0b0f0, 0xe0e0ff], 2), 0x000000)

# Add a title to the y axis
c.yAxis().setTitle("mm per hour")

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

# Display 1 out of 3 labels on the x-axis.
c.xAxis().setLabelStep(3)

# Add an area layer to the chart
layer = c.addAreaLayer()

# Load a snow pattern from an external file "snow.png".
snowPattern = c.patternColor2(os.path.join(os.path.dirname(sys.argv[0]), "snow.png"))

# Add a data set to the area layer using the snow pattern as the fill color. Use deep
# blue (0x0000ff) as the area border line color (&H0000ff&)
layer.addDataSet(data).setDataColor(snowPattern, 0x0000ff)

# Set the line width to 2 pixels to highlight the line
layer.setLineWidth(2)

# Output the chart
print("Content-type: image/png\n")
binaryPrint(c.makeChart2(PNG))