ChartDirector 7.0 (Python Edition)

Color Vertical Bar Meters


          

This example demonstrates horizontal bar meters in various colors, with different color scales, and with title and value readout.

BaseMeter.addColorScale is used to create the color scales in the meters. The color scales are created with various colors, end point positions and widths at the end points.

The title and value readout are created as TextBox objects using BaseChart.addTitle and BaseChart.addTitle2, with the text box background set to the same color as that of the chart border.

Source Code Listing

pythondemo\colorvbarmeter.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 = 66.77 # The background, border and bar colors of the meters bgColor = [0xcce4ff, 0xccffcc, 0xffdddd, 0xffffaa, 0xffccff, 0xeeeeee] borderColor = [0x000088, 0x006600, 0x880000, 0xee6600, 0x6600aa, 0x666666] barColor = [0x2299ff, 0x00ee00, 0xee4455, 0xff8800, 0x8833dd, 0x888888] # Create a LinearMeter object of size 70 x 260 pixels with a 3-pixel thick rounded frame m = LinearMeter(70, 260, bgColor[chartIndex], borderColor[chartIndex]) m.setRoundedFrame(Transparent) m.setThickFrame(3) # Set the scale region top-left corner at (28, 33), with size of 20 x 194 pixels. The scale # labels are located on the left (default - implies vertical meter). m.setMeter(28, 33, 20, 194) # Set meter scale from 0 - 100, with a tick every 10 units m.setScale(0, 100, 10) # Demostrate different types of color scales smoothColorScale = [0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000] stepColorScale = [0, 0x33ff33, 50, 0xffff00, 80, 0xff3333, 100] highLowColorScale = [0, 0x0000ff, 40, Transparent, 60, Transparent, 100, 0xff0000] highColorScale = [70, Transparent, 100, 0xff0000] lowColorScale = [0, 0x0000ff, 30, Transparent] if chartIndex == 0 : # Add a 6-pixel thick smooth color scale at x = 53 (right of meter scale) m.addColorScale(smoothColorScale, 53, 6) elif chartIndex == 1 : # Add a high only color scale at x = 52 (right of meter scale) with thickness varying from 0 # to 8 m.addColorScale(highColorScale, 52, 0, 52, 8) # Add a low only color scale at x = 52 (right of meter scale) with thickness varying from 8 # to 0 m.addColorScale(lowColorScale, 52, 8, 52, 0) elif chartIndex == 2 : # Add a high only color scale at x = 52 (right of meter scale) with thickness varying from 0 # to 8 m.addColorScale(highColorScale, 52, 0, 52, 8) elif chartIndex == 3 : # Add a smooth color scale at x = 52 (right of meter scale) with thickness varying from 0 to # 8 m.addColorScale(smoothColorScale, 52, 0, 52, 8) elif chartIndex == 4 : # Add a 6-pixel thick high/low color scale at x = 53 (right of meter scale) m.addColorScale(highLowColorScale, 53, 6) else : # Add a 6-pixel thick step color scale at x = 53 (right of meter scale) m.addColorScale(stepColorScale, 53, 6) # Add a bar from 0 to value with glass effect and 4 pixel rounded corners m.addBar(0, value, barColor[chartIndex], glassEffect(NormalGlare, Left), 4) # Add a title using white (0xffffff) 8pt Arial Bold font with a border color background m.addTitle("Temp C", "Arial Bold", 8, 0xffffff).setBackground(borderColor[chartIndex]) # Add a bottom title using white (0xffffff) 8pt Arial Bold font with a border color background # to display the value m.addTitle2(Bottom, m.formatValue(value, "2"), "Arial Bold", 8, 0xffffff).setBackground( borderColor[chartIndex]) # Output the chart m.makeChart("colorvbarmeter%s.png" % chartIndex) createChart(0) createChart(1) createChart(2) createChart(3) createChart(4) createChart(5)