Black Semicircle Meters

pythondemo\blacksemicirclemeter.py
#!/usr/bin/python

# The ChartDirector for Python module is assumed to be in "../lib"
import sys, os
sys.path.insert(0, os.path.join(os.path.abspath(sys.path[0]), "..", "lib"))

from pychartdir import *

def createChart(chartIndex) :

    # The value to display on the meter
    value = 72.55

    # Create an AngularMeter object of size 300 x 180 pixels with transparent background
    m = AngularMeter(300, 180, Transparent)

    # Set the default text and line colors to white (0xffffff)
    m.setColor(TextColor, 0xffffff)
    m.setColor(LineColor, 0xffffff)

    # Center at (150, 150), scale radius = 128 pixels, scale angle -90 to +90 degrees
    m.setMeter(150, 150, 128, -90, 90)

    # Gradient color for the border to make it silver-like
    ringGradient = [1, 0x909090, 0.5, 0xd6d6d6, 0, 0xeeeeee, -0.5, 0xd6d6d6, -1, 0x909090]

    # Add a black (0x000000) scale background of 148 pixels radius with a 10 pixel thick silver
    # border
    m.addScaleBackground(148, 0, 10, m.relativeLinearGradient(ringGradient, 45, 148))

    # Meter scale is 0 - 100, with major tick every 20 units, minor tick every 10 units, and micro
    # tick every 5 units
    m.setScale(0, 100, 20, 10, 5)

    # Set the scale label style to 15pt Arial Italic. Set the major/minor/micro tick lengths to
    # 16/16/10 pixels pointing inwards, and their widths to 2/1/1 pixels.
    m.setLabelStyle("Arial Italic", 16)
    m.setTickLength(-16, -16, -10)
    m.setLineWidth(0, 2, 1, 1)

    # Demostrate different types of color scales and putting them at different positions
    smoothColorScale = [0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000]
    stepColorScale = [0, 0x00aa00, 60, 0xddaa00, 80, 0xcc0000, 100]
    highLowColorScale = [0, 0x00ff00, 70, Transparent, 100, 0xff0000]

    if chartIndex == 0 :
        # Add the smooth color scale at the default position
        m.addColorScale(smoothColorScale)
    elif chartIndex == 1 :
        # Add the smooth color scale starting at radius 128 with zero width and ending at radius 128
        # with 16 pixels inner width
        m.addColorScale(smoothColorScale, 128, 0, 128, -16)
    elif chartIndex == 2 :
        # Add the smooth color scale starting at radius 70 with zero width and ending at radius 60
        # with 20 pixels outer width
        m.addColorScale(smoothColorScale, 70, 0, 60, 20)
    elif chartIndex == 3 :
        # Add the high/low color scale at the default position
        m.addColorScale(highLowColorScale)
    elif chartIndex == 4 :
        # Add the step color scale at the default position
        m.addColorScale(stepColorScale)
    else :
        # Add the smooth color scale at radius 60 with 15 pixels outer width
        m.addColorScale(smoothColorScale, 60, 15)

    # Add a text label centered at (150, 125) with 15pt Arial Italic font
    m.addText(150, 125, "CPU", "Arial Italic", 15, TextColor, BottomCenter)

    # Add a red (0xff0000) pointer at the specified value
    m.addPointer2(value, 0xff0000)

    # Add glare up to radius 138 (= region inside border)
    if chartIndex % 2 == 0 :
        m.addGlare(138)

    # Output the chart
    m.makeChart("blacksemicirclemeter%s.png" % chartIndex)


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