Black Round Meters

pythondemo\blackroundmeter.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 = 72.3

    # Create an AngularMeter object of size 250 x 250 pixels with transparent background
    m = AngularMeter(250, 250, Transparent)

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

    # Demonstration two different meter scale angles
    if chartIndex % 2 == 0 :
        # Center at (125, 125), scale radius = 111 pixels, scale angle -140 to +140 degrees
        m.setMeter(125, 125, 111, -140, 140)
    else :
        # Center at (125, 125), scale radius = 111 pixels, scale angle -180 to +90 degrees
         m.setMeter(125, 125, 111, -180, 90)

    # Add a black (0x000000) circle with radius 123 pixels as background
    m.addRing(0, 123, 0x000000)

    # Gradient color for the border to make it silver-like
    ringGradient = [1, 0x7f7f7f, 0.5, 0xd6d6d6, 0, 0xffffff, -0.5, 0xd6d6d6, -1, 0x7f7f7f]
    # Add a ring between radii 116 and 122 pixels using the silver gradient as border
    m.addRing(116, 122, m.relativeLinearGradient(ringGradient, 45, 122))

    # Meter scale is 0 - 100, with major/minor/micro ticks every 10/5/1 units
    m.setScale(0, 100, 10, 5, 1)

    # Set the scale label style to 15pt Arial Italic. Set the major/minor/micro tick lengths to
    # 12/9/6 pixels pointing inwards, and their widths to 2/1/1 pixels.
    m.setLabelStyle("Arial Italic", 15)
    m.setTickLength(-12, -9, -6)
    m.setLineWidth(0, 2, 1, 1)

    # Demostrate different types of color scales and glare effects 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)
        # Add glare up to radius 116 (= region inside border)
        m.addGlare(116)
    elif chartIndex == 1 :
        # Add the smooth color scale starting at radius 62 with zero width and ending at radius 40
        # with 22 pixels outer width
        m.addColorScale(smoothColorScale, 62, 0, 40, 22)
        # Add glare up to radius 116 (= region inside border), concave and spanning 190 degrees
        m.addGlare(116, -190)
    elif chartIndex == 2 :
        # Add the smooth color scale starting at radius 111 with zero width and ending at radius 111
        # with 12 pixels inner width
        m.addColorScale(smoothColorScale, 111, 0, 111, -12)
        # Add glare up to radius 116 (= region inside border), concave and spanning 190 degrees and
        # rotated by 45 degrees
        m.addGlare(116, -190, 45)
    elif chartIndex == 3 :
        # Add the high/low color scale at the default position
        m.addColorScale(highLowColorScale)
    elif chartIndex == 4 :
        # Add the smooth color scale at radius 44 with 16 pixels outer width
        m.addColorScale(smoothColorScale, 44, 16)
        # Add glare up to radius 116 (= region inside border), concave and spanning 190 degrees and
        # rotated by -45 degrees
        m.addGlare(116, -190, -45)
    else :
        # Add the step color scale at the default position
        m.addColorScale(stepColorScale)

    # Add a text label centered at (125, 175) with 15pt Arial Italic font
    m.addText(125, 175, "CPU", "Arial Italic", 15, TextColor, Center)

    # Add a readout to some of the charts as demonstration
    if (chartIndex == 0) or (chartIndex == 2) :
        # Put the value label center aligned at (125, 232), using black (0x000000) 14pt Arial font
        # on a light blue (0x99ccff) background. Set box width to 50 pixels with 5 pixels rounded
        # corners.
        t = m.addText(125, 232, m.formatValue(value, "<*block,width=50,halign=center*>{value|1}"),
            "Arial", 14, 0x000000, BottomCenter)
        t.setBackground(0x99ccff)
        t.setRoundedCorners(5)

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

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


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