ChartDirector 5.1 (Python Edition)

Horizontal Linear Meter




This example demonstrates a simple horizontal 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\hlinearmeter.py
#!/usr/bin/python
from pychartdir import *

# The value to display on the meter
value = 75.35

# Create an LinearMeter object of size 250 x 75 pixels, using silver background with
# a 2 pixel black 3D depressed border.
m = LinearMeter(250, 75, silverColor(), 0, -2)

# Set the scale region top-left corner at (15, 25), with size of 200 x 50 pixels. The
# scale labels are located on the top (implies horizontal meter)
m.setMeter(15, 25, 220, 20, Top)

# 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 blue (0000cc) pointer at the specified value
m.addPointer(value, 0x0000cc)

# Add a label at bottom-left (10, 68) using Arial Bold/8 pts/red (c00000)
m.addText(10, 68, "Temperature C", "arialbd.ttf", 8, 0xc00000, BottomLeft)

# Add a text box to show the value formatted to 2 decimal places at bottom right. Use
# white text on black background with a 1 pixel depressed 3D border.
m.addText(238, 70, m.formatValue(value, "2"), "arial.ttf", 8, 0xffffff, BottomRight
    ).setBackground(0, 0, -1)

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

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

# The value to display on the meter
value = 75.35

# Create an LinearMeter object of size 250 x 75 pixels, using silver background with
# a 2 pixel black 3D depressed border.
m = LinearMeter(250, 75, silverColor(), 0, -2)

# Set the scale region top-left corner at (15, 25), with size of 200 x 50 pixels. The
# scale labels are located on the top (implies horizontal meter)
m.setMeter(15, 25, 220, 20, Top)

# 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 blue (0000cc) pointer at the specified value
m.addPointer(value, 0x0000cc)

# Add a label at bottom-left (10, 68) using Arial Bold/8 pts/red (c00000)
m.addText(10, 68, "Temperature C", "arialbd.ttf", 8, 0xc00000, BottomLeft)

# Add a text box to show the value formatted to 2 decimal places at bottom right. Use
# white text on black background with a 1 pixel depressed 3D border.
m.addText(238, 70, m.formatValue(value, "2"), "arial.ttf", 8, 0xffffff, BottomRight
    ).setBackground(0, 0, -1)

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