ChartDirector 7.0 (Perl Edition)

Color Vertical Linear Meters


          

This example demonstrates horizontal linear 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

perldemo\colorvlinearmeter.pl
#!/usr/bin/perl # The ChartDirector for Perl module is assumed to be in "../lib" use File::Basename; use lib (dirname($0)."/../lib") =~ /(.*)/; use perlchartdir; sub createChart { my $chartIndex = shift; # The value to display on the meter my $value = 74.25; # The background and border colors of the meters my $bgColor = [0xbbddff, 0xccffcc, 0xffccff, 0xffffaa, 0xffdddd, 0xeeeeee]; my $borderColor = [0x000088, 0x006600, 0x6600aa, 0xee6600, 0x880000, 0x666666]; # Create a LinearMeter object of size 70 x 260 pixels with a 3-pixel thick rounded frame my $m = new LinearMeter(70, 260, $bgColor->[$chartIndex], $borderColor->[$chartIndex]); $m->setRoundedFrame($perlchartdir::Transparent); $m->setThickFrame(3); # Set the scale region top-left corner at (28, 30), with size of 20 x 200 pixels. The scale # labels are located on the left (default - implies vertical meter) $m->setMeter(28, 30, 20, 200); # Set meter scale from 0 - 100, with a tick every 10 units $m->setScale(0, 100, 10); # Demostrate different types of color scales and putting them at different positions my $smoothColorScale = [0, 0x6666ff, 25, 0x00bbbb, 50, 0x00ff00, 75, 0xffff00, 100, 0xff0000]; my $stepColorScale = [0, 0x33ff33, 50, 0xffff33, 80, 0xff3333, 100]; my $highLowColorScale = [0, 0x6666ff, 70, $perlchartdir::Transparent, 100, 0xff0000]; if ($chartIndex == 0) { # Add the smooth color scale at the default position $m->addColorScale($smoothColorScale); } elsif ($chartIndex == 1) { # Add the step color scale at the default position $m->addColorScale($stepColorScale); } elsif ($chartIndex == 2) { # Add the high low scale at the default position $m->addColorScale($highLowColorScale); } elsif ($chartIndex == 3) { # Add the smooth color scale starting at x = 28 (left of scale) with zero width and ending # at x = 28 with 20 pixels width $m->addColorScale($smoothColorScale, 28, 0, 28, 20); } elsif ($chartIndex == 4) { # Add the smooth color scale starting at x = 38 (center of scale) with zero width and ending # at x = 28 with 20 pixels width $m->addColorScale($smoothColorScale, 38, 0, 28, 20); } else { # Add the smooth color scale starting at x = 48 (right of scale) with zero width and ending # at x = 28 with 20 pixels width $m->addColorScale($smoothColorScale, 48, 0, 28, 20); } # Add a blue (0x0000cc) pointer at the specified value $m->addPointer($value, 0x0000cc); # 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 $m->addTitle2($perlchartdir::Bottom, $m->formatValue($value, "2"), "Arial Bold", 8, 0xffffff )->setBackground($borderColor->[$chartIndex]); # Output the chart $m->makeChart("colorvlinearmeter$chartIndex.png"); } createChart(0); createChart(1); createChart(2); createChart(3); createChart(4); createChart(5);