ChartDirector Ver 4.1 (Python Edition)

Enhanced Area Chart




This example extends the Simple Area Chart example by decorating the chart using a number of chart formatting features.

Source Code Listing

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

# The data for the area chart
data = [30, 28, 40, 55, 75, 68, 54, 60, 50, 62, 75, 65, 75, 89, 60, 55, 53, 35, 50,
    66, 56, 48, 52, 65, 62]

# 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 600 x 300 pixels, with a pale blue (eeeeff)
# background, black border, 1 pixel 3D border effect and rounded corners.
c = XYChart(600, 300, 0xeeeeff, 0x000000, 1)
c.setRoundedFrame()

# Set the plotarea at (55, 55) and of size 520 x 195 pixels, with white (ffffff)
# background. Set horizontal and vertical grid lines to grey (cccccc).
c.setPlotArea(55, 55, 520, 195, 0xffffff, -1, -1, 0xcccccc, 0xcccccc)

# Add a title box to the chart using 15 pts Times Bold Italic font. The text is white
# (ffffff) on a deep blue (000088) background, with soft lighting effect from the
# right side.
c.addTitle(
    "<*block,valign=absmiddle*><*img=star.png*><*img=star.png*> Performance " \
    "Enhancer <*img=star.png*><*img=star.png*><*/*>", "timesbi.ttf", 15, 0xffffff
    ).setBackground(0x000088, -1, softLighting(Right))

# Add a title to the y axis
c.yAxis().setTitle("Energy Concentration (KJ per liter)")

# 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 a title to the x axis using CDML
c.xAxis().setTitle(
    "<*block,valign=absmiddle*><*img=clock.png*>  Elapsed Time (hour)<*/*>")

# Set the axes width to 2 pixels
c.xAxis().setWidth(2)
c.yAxis().setWidth(2)

# Add an area layer to the chart using a gradient color that changes vertically from
# semi-transparent red (80ff0000) to semi-transparent white (80ffffff)
c.addAreaLayer(data, c.linearGradientColor(0, 50, 0, 255, 0x80ff0000L, 0x80ffffffL))

# Add a custom CDML text at the bottom right of the plot area as the logo
c.addText(575, 245,
    "<*block,valign=absmiddle*><*img=small_molecule.png*> <*block*>" \
    "<*font=timesbi.ttf,size=10,color=804040*>Molecular\nEngineering<*/*>"
    ).setAlignment(BottomRight)

# output the chart
c.makeChart("enhancedarea.png")

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

# The data for the area chart
data = [30, 28, 40, 55, 75, 68, 54, 60, 50, 62, 75, 65, 75, 89, 60, 55, 53, 35, 50,
    66, 56, 48, 52, 65, 62]

# 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 600 x 300 pixels, with a pale blue (eeeeff)
# background, black border, 1 pixel 3D border effect and rounded corners.
c = XYChart(600, 300, 0xeeeeff, 0x000000, 1)
c.setRoundedFrame()

# Set directory for loading images to current script directory
# Need when running under Microsoft IIS
c.setSearchPath(os.path.dirname(sys.argv[0]))

# Set the plotarea at (55, 55) and of size 520 x 195 pixels, with white (ffffff)
# background. Set horizontal and vertical grid lines to grey (cccccc).
c.setPlotArea(55, 55, 520, 195, 0xffffff, -1, -1, 0xcccccc, 0xcccccc)

# Add a title box to the chart using 15 pts Times Bold Italic font. The text is white
# (ffffff) on a deep blue (000088) background, with soft lighting effect from the
# right side.
c.addTitle(
    "<*block,valign=absmiddle*><*img=star.png*><*img=star.png*> Performance " \
    "Enhancer <*img=star.png*><*img=star.png*><*/*>", "timesbi.ttf", 15, 0xffffff
    ).setBackground(0x000088, -1, softLighting(Right))

# Add a title to the y axis
c.yAxis().setTitle("Energy Concentration (KJ per liter)")

# 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 a title to the x axis using CDML
c.xAxis().setTitle(
    "<*block,valign=absmiddle*><*img=clock.png*>  Elapsed Time (hour)<*/*>")

# Set the axes width to 2 pixels
c.xAxis().setWidth(2)
c.yAxis().setWidth(2)

# Add an area layer to the chart using a gradient color that changes vertically from
# semi-transparent red (80ff0000) to semi-transparent white (80ffffff)
c.addAreaLayer(data, c.linearGradientColor(0, 50, 0, 255, 0x80ff0000L, 0x80ffffffL))

# Add a custom CDML text at the bottom right of the plot area as the logo
c.addText(575, 245,
    "<*block,valign=absmiddle*><*img=small_molecule.png*> <*block*>" \
    "<*font=timesbi.ttf,size=10,color=804040*>Molecular\nEngineering<*/*>"
    ).setAlignment(BottomRight)

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