ChartDirector 5.1 (Python Edition)

3D Pie Shading


            

This example demonstrates various sector shading effects applicable to 3D pie charts.

Source Code Listing

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

def createChart(img) :

    # The data for the pie chart
    data = [18, 30, 20, 15]

    # The colors to use for the sectors
    colors = [0x66aaee, 0xeebb22, 0xbbbbbb, 0x8844ff]

    # Create a PieChart object of size 200 x 200 pixels. Use a vertical gradient
    # color from blue (0000cc) to deep blue (000044) as background. Use rounded
    # corners of 16 pixels radius.
    c = PieChart(200, 200)
    c.setBackground(c.linearGradientColor(0, 0, 0, c.getHeight(), 0x0000cc, 0x000044)
        )
    c.setRoundedFrame(0xffffff, 16)

    # Set the center of the pie at (100, 100) and the radius to 80 pixels
    c.setPieSize(100, 100, 80)

    # Set the pie data
    c.setData(data)

    # Set the sector colors
    c.setColors2(DataColor, colors)

    # Draw the pie in 3D with a pie thickness of 20 pixels
    c.set3D(20)

    # Demonstrates various shading modes
    if img == "0" :
        c.addTitle("Default Shading", "bold", 12, 0xffffff)
    elif img == "1" :
        c.addTitle("Flat Gradient", "bold", 12, 0xffffff)
        c.setSectorStyle(FlatShading)
    elif img == "2" :
        c.addTitle("Local Gradient", "bold", 12, 0xffffff)
        c.setSectorStyle(LocalGradientShading)
    elif img == "3" :
        c.addTitle("Global Gradient", "bold", 12, 0xffffff)
        c.setSectorStyle(GlobalGradientShading)
    elif img == "4" :
        c.addTitle("Concave Shading", "bold", 12, 0xffffff)
        c.setSectorStyle(ConcaveShading)
    elif img == "5" :
        c.addTitle("Rounded Edge", "bold", 12, 0xffffff)
        c.setSectorStyle(RoundedEdgeShading)
    elif img == "6" :
        c.addTitle("Radial Gradient", "bold", 12, 0xffffff)
        c.setSectorStyle(RadialShading)

    # Disable the sector labels by setting the color to Transparent
    c.setLabelStyle("", 8, Transparent)

    # Output the chart
    c.makeChart("threedpieshading%s.png" % img)


createChart("0")
createChart("1")
createChart("2")
createChart("3")
createChart("4")
createChart("5")
createChart("6")

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

# Get HTTP query parameters
query = cgi.FieldStorage()

# The data for the pie chart
data = [18, 30, 20, 15]

# The colors to use for the sectors
colors = [0x66aaee, 0xeebb22, 0xbbbbbb, 0x8844ff]

# Create a PieChart object of size 200 x 200 pixels. Use a vertical gradient color
# from blue (0000cc) to deep blue (000044) as background. Use rounded corners of 16
# pixels radius.
c = PieChart(200, 200)
c.setBackground(c.linearGradientColor(0, 0, 0, c.getHeight(), 0x0000cc, 0x000044))
c.setRoundedFrame(0xffffff, 16)

# Set the center of the pie at (100, 100) and the radius to 80 pixels
c.setPieSize(100, 100, 80)

# Set the pie data
c.setData(data)

# Set the sector colors
c.setColors2(DataColor, colors)

# Draw the pie in 3D with a pie thickness of 20 pixels
c.set3D(20)

# Demonstrates various shading modes
if query["img"].value == "0" :
    c.addTitle("Default Shading", "bold", 12, 0xffffff)
elif query["img"].value == "1" :
    c.addTitle("Flat Gradient", "bold", 12, 0xffffff)
    c.setSectorStyle(FlatShading)
elif query["img"].value == "2" :
    c.addTitle("Local Gradient", "bold", 12, 0xffffff)
    c.setSectorStyle(LocalGradientShading)
elif query["img"].value == "3" :
    c.addTitle("Global Gradient", "bold", 12, 0xffffff)
    c.setSectorStyle(GlobalGradientShading)
elif query["img"].value == "4" :
    c.addTitle("Concave Shading", "bold", 12, 0xffffff)
    c.setSectorStyle(ConcaveShading)
elif query["img"].value == "5" :
    c.addTitle("Rounded Edge", "bold", 12, 0xffffff)
    c.setSectorStyle(RoundedEdgeShading)
elif query["img"].value == "6" :
    c.addTitle("Radial Gradient", "bold", 12, 0xffffff)
    c.setSectorStyle(RadialShading)

# Disable the sector labels by setting the color to Transparent
c.setLabelStyle("", 8, Transparent)

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