ChartDirector Ver 5.0 (Python Edition)

Vertical Linear Meter




This example demonstrates a simple vertical linear meter.

A basic linear meter can be created using the following steps:

In addition to the basic linear meter, this example demonstrates the following features:

Source Code Listing

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

# The value to display on the meter
value = 75.35

# Create an LinearMeter object of size 60 x 265 pixels, using silver background with
# a 2 pixel black 3D depressed border.
m = LinearMeter(60, 265, 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 a deep blue (000080) pointer at the specified value
m.addPointer(value, '0x000080')

# 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')

# Add a text box to show the value formatted to 2 decimal places at bottom center
# (30, 260). Use white text on black background with a 1 pixel depressed 3D border.
m.addText(30, 260, m.formatValue(value, "2"), "arial.ttf", 8, '0xffffff',
    BottomCenter).setBackground(0, 0, -1)

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

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

# The value to display on the meter
value = 75.35

# Create an LinearMeter object of size 60 x 265 pixels, using silver background with
# a 2 pixel black 3D depressed border.
m = LinearMeter(60, 265, 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 a deep blue (000080) pointer at the specified value
m.addPointer(value, '0x000080')

# 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')

# Add a text box to show the value formatted to 2 decimal places at bottom center
# (30, 260). Use white text on black background with a 1 pixel depressed 3D border.
m.addText(30, 260, m.formatValue(value, "2"), "arial.ttf", 8, '0xffffff',
    BottomCenter).setBackground(0, 0, -1)

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