ChartDirector 5.1 (Python Edition)

Multi-Pointer Vertical Meter




This example demonstrates a vertical linear meter with multiple pointers.

ChartDirector supports adding arbitrary number of pointers to a meter using BaseMeter.addPointer. The shape of each pointer is configurable by using MeterPointer.setShape or MeterPointer.setShape2.

Source Code Listing

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

# The values to display on the meter
value0 = 30.99
value1 = 45.35
value2 = 77.64

# Create an LinearMeter object of size 60 x 245 pixels, using silver background with
# a 2 pixel black 3D depressed border.
m = LinearMeter(60, 245, silverColor(), 0, -2)

# Set the scale region top-left corner at (25, 30), with size of 20 x 200 pixels. The
# scale labels are located on the left (default - implies vertical meter)
m.setMeter(25, 30, 20, 200)

# Set meter scale from 0 - 100, with a tick every 10 units
m.setScale(0, 100, 10)

# Set 0 - 50 as green (99ff99) zone, 50 - 80 as yellow (ffff66) zone, and 80 - 100 as
# red (ffcccc) zone
m.addZone(0, 50, 0x99ff99)
m.addZone(50, 80, 0xffff66)
m.addZone(80, 100, 0xffcccc)

# Add deep red (000080), deep green (008000) and deep blue (800000) pointers to
# reflect the values
m.addPointer(value0, 0x000080)
m.addPointer(value1, 0x008000)
m.addPointer(value2, 0x800000)

# Add a text box label at top-center (30, 5) using Arial Bold/8 pts/deep blue
# (000088), with a light blue (9999ff) background
m.addText(30, 5, "Temp C", "arialbd.ttf", 8, 0x000088, TopCenter).setBackground(
    0x9999ff)

# Output the chart
m.makeChart("multivmeter.png")

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

# The values to display on the meter
value0 = 30.99
value1 = 45.35
value2 = 77.64

# Create an LinearMeter object of size 60 x 245 pixels, using silver background with
# a 2 pixel black 3D depressed border.
m = LinearMeter(60, 245, silverColor(), 0, -2)

# Set the scale region top-left corner at (25, 30), with size of 20 x 200 pixels. The
# scale labels are located on the left (default - implies vertical meter)
m.setMeter(25, 30, 20, 200)

# Set meter scale from 0 - 100, with a tick every 10 units
m.setScale(0, 100, 10)

# Set 0 - 50 as green (99ff99) zone, 50 - 80 as yellow (ffff66) zone, and 80 - 100 as
# red (ffcccc) zone
m.addZone(0, 50, 0x99ff99)
m.addZone(50, 80, 0xffff66)
m.addZone(80, 100, 0xffcccc)

# Add deep red (000080), deep green (008000) and deep blue (800000) pointers to
# reflect the values
m.addPointer(value0, 0x000080)
m.addPointer(value1, 0x008000)
m.addPointer(value2, 0x800000)

# Add a text box label at top-center (30, 5) using Arial Bold/8 pts/deep blue
# (000088), with a light blue (9999ff) background
m.addText(30, 5, "Temp C", "arialbd.ttf", 8, 0x000088, TopCenter).setBackground(
    0x9999ff)

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