ChartDirector 5.1 (Python Edition)

Spline Line Chart




This example demonstrates using spline curves to join data points, title with soft lighting effect, as well as a number of chart formatting techniques.

Source Code Listing

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

# The data for the chart
data0 = [32, 39, 23, 28, 41, 38, 26, 35, 29]
data1 = [50, 55, 47, 34, 47, 53, 38, 40, 51]

# The labels for the chart
labels = ["0", "1", "2", "3", "4", "5", "6", "7", "8"]

# Create a XYChart object of size 600 x 300 pixels, with a pale red (ffdddd)
# background, black border, 1 pixel 3D border effect and rounded corners.
c = XYChart(600, 300, 0xffdddd, 0x000000, 1)
c.setRoundedFrame()

# Set the plotarea at (55, 58) and of size 520 x 195 pixels, with white (ffffff)
# background. Set horizontal and vertical grid lines to grey (cccccc).
c.setPlotArea(55, 58, 520, 195, 0xffffff, -1, -1, 0xcccccc, 0xcccccc)

# Add a legend box at (55, 32) (top of the chart) with horizontal layout. Use 9 pts
# Arial Bold font. Set the background and border color to Transparent.
c.addLegend(55, 32, 0, "arialbd.ttf", 9).setBackground(Transparent)

# Add a title box to the chart using 15 pts Times Bold Italic font. The title is in
# CDML and includes embedded images for highlight. The text is white (ffffff) on a
# dark red (880000) 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(0x880000, -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)

# Add a title to the x axis using CMDL
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 a spline layer to the chart
layer = c.addSplineLayer()

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

# Add a data set to the spline layer, using blue (0000c0) as the line color, with
# yellow (ffff00) circle symbols.
layer.addDataSet(data1, 0x0000c0, "Target Group").setDataSymbol(CircleSymbol, 9,
    0xffff00)

# Add a data set to the spline layer, using brown (982810) as the line color, with
# pink (f040f0) diamond symbols.
layer.addDataSet(data0, 0x982810, "Control Group").setDataSymbol(DiamondSymbol, 11,
    0xf040f0)

# Add a custom CDML text at the bottom right of the plot area as the logo
c.addText(575, 250,
    "<*block,valign=absmiddle*><*img=small_molecule.png*> <*block*>" \
    "<*font=timesbi.ttf,size=10,color=804040*>Molecular\nEngineering<*/*>"
    ).setAlignment(BottomRight)

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

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

# The data for the chart
data0 = [32, 39, 23, 28, 41, 38, 26, 35, 29]
data1 = [50, 55, 47, 34, 47, 53, 38, 40, 51]

# The labels for the chart
labels = ["0", "1", "2", "3", "4", "5", "6", "7", "8"]

# Create a XYChart object of size 600 x 300 pixels, with a pale red (ffdddd)
# background, black border, 1 pixel 3D border effect and rounded corners.
c = XYChart(600, 300, 0xffdddd, 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, 58) and of size 520 x 195 pixels, with white (ffffff)
# background. Set horizontal and vertical grid lines to grey (cccccc).
c.setPlotArea(55, 58, 520, 195, 0xffffff, -1, -1, 0xcccccc, 0xcccccc)

# Add a legend box at (55, 32) (top of the chart) with horizontal layout. Use 9 pts
# Arial Bold font. Set the background and border color to Transparent.
c.addLegend(55, 32, 0, "arialbd.ttf", 9).setBackground(Transparent)

# Add a title box to the chart using 15 pts Times Bold Italic font. The title is in
# CDML and includes embedded images for highlight. The text is white (ffffff) on a
# dark red (880000) 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(0x880000, -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)

# Add a title to the x axis using CMDL
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 a spline layer to the chart
layer = c.addSplineLayer()

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

# Add a data set to the spline layer, using blue (0000c0) as the line color, with
# yellow (ffff00) circle symbols.
layer.addDataSet(data1, 0x0000c0, "Target Group").setDataSymbol(CircleSymbol, 9,
    0xffff00)

# Add a data set to the spline layer, using brown (982810) as the line color, with
# pink (f040f0) diamond symbols.
layer.addDataSet(data0, 0x982810, "Control Group").setDataSymbol(DiamondSymbol, 11,
    0xf040f0)

# Add a custom CDML text at the bottom right of the plot area as the logo
c.addText(575, 250,
    "<*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))