#!/usr/bin/python
from pychartdir import *
import cgi, sys

# Get HTTP query parameters
query = cgi.FieldStorage()

# This script can draw different charts depending on the chartIndex
chartIndex = int(query["img"].value)

# The value to display on the meter
value = 74.25

# Create a LinearMeter object of size 250 x 75 pixels with very light grey (0xeeeeee) backgruond and
# a light grey (0xccccccc) 3-pixel thick rounded frame
m = LinearMeter(250, 75, 0xeeeeee, 0xcccccc)
m.setRoundedFrame(Transparent)
m.setThickFrame(3)

# This example demonstrates putting the text labels at the top or bottom. This is by setting the
# label alignment, scale position and label position.
alignment = [Top, Top, Bottom, Bottom]
meterYPos = [23, 23, 34, 34]
labelYPos = [61, 61, 15, 15]

# Set the scale region
m.setMeter(14, meterYPos[chartIndex], 218, 20, alignment[chartIndex])

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

# Add a smooth color scale at the default position
smoothColorScale = [0, 0x6666ff, 25, 0x00bbbb, 50, 0x00ff00, 75, 0xffff00, 100, 0xff0000]
m.addColorScale(smoothColorScale)

# Add a blue (0x0000cc) pointer at the specified value
m.addPointer(value, 0x0000cc)

#
# In this example, some charts have the "Temperauture" label on the left side and the value readout
# on the right side, and some charts have the reverse
#

if chartIndex % 2 == 0 :
    # Add a label on the left side using 8pt Arial Bold font
    m.addText(10, labelYPos[chartIndex], "Temperature C", "arialbd.ttf", 8, TextColor, Left)

    # Add a text box on the right side. Display the value using white (0xffffff) 8pt Arial Bold font
    # on a black (0x000000) background with depressed rounded border.
    t = m.addText(235, labelYPos[chartIndex], m.formatValue(value, "2"), "arialbd.ttf", 8, 0xffffff,
        Right)
    t.setBackground(0x000000, 0x000000, -1)
    t.setRoundedCorners(3)
else :
    # Add a label on the right side using 8pt Arial Bold font
    m.addText(237, labelYPos[chartIndex], "Temperature C", "arialbd.ttf", 8, TextColor, Right)

    # Add a text box on the left side. Display the value using white (0xffffff) 8pt Arial Bold font
    # on a black (0x000000) background with depressed rounded border.
    t = m.addText(11, labelYPos[chartIndex], m.formatValue(value, "2"), "arialbd.ttf", 8, 0xffffff,
        Left)
    t.setBackground(0x000000, 0x000000, -1)
    t.setRoundedCorners(3)

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

