ChartDirector Ver 4.1 (PHP Edition)

Multi-Pointer Angular Meter




This example demonstrates adding multiple pointers of different styles to a meter.

ChartDirector supports adding arbitrary number of pointers to a meter using BaseMeter.addPointer. The shape of each pointer is configurable by using MeterPointer.setShape or MeterPointer.setShape2.

This example demonstrates the 5 different built-in angular pointer styles in ChartDirector. Note the use of semi-transparent colors to avoid the pointers blocking the labels or each others.

Source Code Listing

[File: phpdemo/multiameter.php]
<?php
require_once("../lib/phpchartdir.php");

# Create an AugularMeter object of size 200 x 200 pixels
$m = new AngularMeter(200, 200);

# Use white on black color palette for default text and line colors
$m->setColors($whiteOnBlackPalette);

# Set the meter center at (100, 100), with radius 85 pixels, and span from 0 to 360
# degress
$m->setMeter(100, 100, 85, 0, 360);

# Meter scale is 0 - 100, with major tick every 10 units, minor tick every 5 units,
# and micro tick every 1 units
$m->setScale(0, 100, 10, 5, 1);

# Set angular arc, major tick and minor tick line widths to 2 pixels.
$m->setLineWidth(2, 2, 2);

# Add a blue (9999ff) ring between radii 88 - 90 as decoration
$m->addRing(88, 90, 0x9999ff);

# Set 0 - 60 as green (00AA00) zone, 60 - 80 as yellow (CCCC00) zone, and 80 - 100 as
# red (AA0000) zone
$m->addZone(0, 60, 0x00aa00);
$m->addZone(60, 80, 0xcccc00);
$m->addZone(80, 100, 0xaa0000);

# Add a text label centered at (100, 70) with 12 pts Arial Bold font
$m->addText(100, 70, "PSI", "arialbd.ttf", 12, TextColor, Center);

# Add a semi-transparent blue (806666FF) pointer    using the default shape
$m->addPointer(25, 0x806666ff, 0x6666ff);

# Add a semi-transparent red (80FF6666) pointer using the arrow shape
$pointerObj = $m->addPointer(9, 0x80ff6666, 0xff6666);
$pointerObj->setShape(ArrowPointer2);

# Add a semi-transparent yellow (80FFFF66) pointer using another arrow shape
$pointerObj = $m->addPointer(51, 0x80ffff66, 0xffff66);
$pointerObj->setShape(ArrowPointer);

# Add a semi-transparent green (8066FF66) pointer using the line shape
$pointerObj = $m->addPointer(72, 0x8066ff66, 0x66ff66);
$pointerObj->setShape(LinePointer);

# Add a semi-transparent grey (80CCCCCC) pointer using the pencil shape
$pointerObj = $m->addPointer(85, 0x80cccccc, 0xcccccc);
$pointerObj->setShape(PencilPointer);

# output the chart
header("Content-type: image/png");
print($m->makeChart2(PNG));
?>