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<?php
///////////////////////////////////////////////////////////
//PHPGraphLib - PHP Graphing Library v2.31 - Pie Chart Extension
//Author: Elliott Brueggeman
//PHP v4.04 + compatible
//Please visit www.ebrueggeman.com for usage policy
//and documentation + examples
///////////////////////////////////////////////////////////
class PHPGraphLibPie extends PHPGraphLib {
//user changeable defaults
var $pie_precision = 0; //number of significant digits in label %
var $bool_legend = true;
var $bool_data_labels = true;
var $pie_3D_height_percent = 4; //is % of total width
var $pie_legend_text_width = 6; //in px...
var $pie_legend_text_height = 12;
var $pie_label_text_width = 6;
var $pie_label_text_height = 12;
var $pie_legend_padding = 5; //padding inside legend box
//default colors, in order of display on graph - you can change order if needed
var $pie_avail_colors = array('pastel_orange_1','pastel_orange_2','pastel_blue_1','pastel_green_1','clay',
'pastel_blue_2','pastel_yellow','silver','pastel_green_2','brown','gray','pastel_purple', 'olive',
'aqua','yellow','teal','lime');
//internal defaults - change not recommended
var $pie_center_y_offset = 50; //in %
var $pie_center_x_offset = 50; //in %
var $pie_center_legend_scale = 55; //offset in % of existing coords when legend
var $pie_width_percent = 75; //default width % of total width
var $pie_height_percent = 28;
var $pie_label_scale = 90; //in % scale width/height if data labels
var $pie_legend_scale = 64;//in % scale width/height if legend
//internals - do not change
var $pie_width;
var $pie_height;
var $pie_center_x;
var $pie_center_y;
var $pie_legend_width;
var $pie_legend_height;
var $pie_legend_x;
var $pie_legend_y;
var $pie_data_max_length = 0;
var $pie_color_pointer = 0;
var $pie_data_array_percents;
var $pie_data_label_space;
var $pie_3D_height;
function PHPGraphLibPie($width = '', $height = '') {
PHPGraphLib::PHPGraphLib($width, $height);
}
function initialize() {
PHPGraphLib::initialize();
$this->pie_data_array_percents = array();
}
function calcCoords() {
//CALC COORDS OF PIE CENTER AND WIDTH/HEIGHT
$this->pie_width = $this->width * ($this->pie_width_percent / 100);
$this->pie_height = $this->width * ($this->pie_height_percent / 100);
$this->pie_center_y = $this->height * ($this->pie_center_y_offset / 100);
$this->pie_center_x = $this->width * ($this->pie_center_x_offset / 100);
//SET DATA LABEL SPACING
if ($this->bool_data_labels) {
//SET TO NUMBER OF PIXELS THAT ARE EQUAL TO TEXT WIDTH
//7 IS A BASE SPACER THAT ALL LABELS GET
$this->pie_data_label_space = 7 + $this->width / 30;
$this->pie_width *= $this->pie_label_scale / 100;
$this->pie_height *= $this->pie_label_scale / 100;
}
if ($this->bool_legend) {
//COMPENSATE FOR LEGEND WITH LESSER PRESET PERCENT
$this->pie_width *= $this->pie_legend_scale / 100;
$this->pie_height *= $this->pie_legend_scale / 100;
$this->pie_center_x *= $this->pie_center_legend_scale / 100;
}
$this->pie_3D_height = $this->pie_3D_height_percent * ($this->pie_width / 100);
}
function setupData() {
//IN THE PIE EXTENSION, THIS WILL CALCULATE THE TOTAL SUM AND THE CORRESPONDING PERCENTAGES
if ($this->data_set_count==1) {
$sum = array_sum($this->data_array[0]);
if ($sum > 0) {
foreach ($this->data_array[0] as $dataText => $dataValue) {
$this->pie_data_array_percents[] = $dataValue / $sum;
//FIND DATA TEXT LENGTH
$len = strlen($dataText);
if ($len > $this->pie_data_max_length){ $this->pie_data_max_length = $len; }
}
$this->bool_bars_generate = true;
}
else {
$this->bool_bars_generate = false;
$this->error[] = "Sum of data must be greater than 0.";
}
}
else
{
$this->error[]="Multiple datasets not allowed with pie charts";
}
}
function generateGrid() {}
function generateLegend() {
$maxChars = NULL;
//CALC HEIGHT / WIDTH BASED ON # OF VALUES
$this->pie_legend_height = ($this->pie_legend_text_height * $this->data_count) + (2 * $this->pie_legend_padding);
$this->pie_legend_width = ($this->pie_data_max_length * $this->pie_legend_text_width) + (6 * $this->pie_legend_padding);
//ALLOTTED SPACE DOES NOT INCLUDE PADDING AROUND LEGEND (SMALLER)
$allottedSpace = $this->width - $this->pie_center_x - ($this->pie_width / 2) - (2 * $this->pie_legend_padding);
if ($this->bool_data_labels) {
//ALSO COMPENSATE FOR DISPLAYED TEXT DATA % ON GRAPH
$allottedSpace -= ((4 + $this->pie_precision) * $this->pie_label_text_width) + $this->pie_data_label_space;
}
//CHECK TO MAKE SURE WE ARE NOT > ALLOTTED SPACE
if ($this->pie_legend_width > $allottedSpace) {
//IF WE ARE, ADJUST WIDTH AND MAX LENGTH FOR DATA VALUES
//4 = Padding | Swatch(Padding Width) | Padding | ...text... |Padding
$swatchAndPaddingWidth = 4 * $this->pie_legend_padding;
//MAX CHARS = ALOTTED SPACE - ENOUGH ROOM FOR SWATCHES / TEXT WIDTH
$maxChars = floor(($allottedSpace - $swatchAndPaddingWidth) / $this->pie_legend_text_width);
$this->pie_legend_width = ($maxChars * $this->pie_legend_text_width) + $swatchAndPaddingWidth;
}
else {
//WE DIDNT GO OVER ALLOTTED SPACE, SO WE SHOULD ADJUST THE CENTER OF THE PIE CHART NOW
$equalSpacing = ($this->width - ($this->pie_width + $this->pie_legend_width)) / 3;
//SO NOW REPOSITION CENTER AT SPACING + 1/2 PIE WIDTH
$this->pie_center_x = ($this->pie_width / 2) + $equalSpacing;
}
//AUTO ADJUSTING FORMULA FOR POSITION OF pie_legend_x BASED ON PIE CHART SIZE
$a = ($this->pie_center_x + $this->pie_width / 2);
$b = $this->width - $a;
$c = ($b - $this->pie_legend_width) / 2;
//SET PIE X & Y ARGS
$this->pie_legend_x = $a + $c;
$this->pie_legend_y = ($this->height - $this->pie_legend_height) / 2;
//BACKGROUND
imagefilledrectangle($this->image, $this->pie_legend_x, $this->pie_legend_y, $this->pie_legend_x + $this->pie_legend_width,
$this->pie_legend_y + $this->pie_legend_height, $this->legend_color);
//BORDER
imagerectangle($this->image, $this->pie_legend_x, $this->pie_legend_y, $this->pie_legend_x + $this->pie_legend_width,
$this->pie_legend_y + $this->pie_legend_height, $this->legend_outline_color);
$xValue = $this->pie_legend_x + ($this->pie_legend_padding);
$count = 0;
$this->resetColorPointer();
$swatchToTextOffset = ($this->pie_legend_text_height - 6) / 2;
$swatchSize = $this->pie_legend_text_height - (2 * $swatchToTextOffset);
foreach ($this->data_array[0] as $dataText => $dataValue) {
$yValue = $this->pie_legend_y + $this->pie_legend_text_height * $count + $this->pie_legend_padding;
//DRAW COLOR BOXES
$color = $this->generateNextColor();
imagefilledrectangle($this->image, $xValue, $yValue + $swatchToTextOffset, $xValue + $swatchSize, $yValue + $swatchToTextOffset + $swatchSize, $color);
imagerectangle($this->image, $xValue, $yValue + $swatchToTextOffset, $xValue + $swatchSize, $yValue + $swatchToTextOffset + $swatchSize, $this->legend_swatch_outline_color);
//IF LONGER THAN OUR MAX, TRIM TEXT
if($maxChars){ $dataText = substr($dataText,0, $maxChars); }
imagestring($this->image, 2, $xValue + (2 * $this->pie_legend_padding), $yValue, $dataText, $this->legend_text_color);
$count++;
}
}
function generateBars()
{
$this->resetColorPointer();
//LOOP THROUGH AND CREATE SHADAING
for($i = $this->pie_center_y + $this->pie_3D_height; $i > $this->pie_center_y; $i--) {
$arcStart = 0;
foreach ($this->pie_data_array_percents as $key => $value) {
$color = $this->generateNextColor(true); //GENERATE A DARKER VERSION OF THE INDEXED COLOR
imagefilledarc($this->image, $this->pie_center_x, $i, $this->pie_width, $this->pie_height, $arcStart, (360 * $value) + $arcStart, $color, IMG_ARC_PIE);
$arcStart += 360*$value;
}
$this->resetColorPointer();
}
$arcStart = 0;
foreach ($this->pie_data_array_percents as $key => $value) {
$color = $this->generateNextColor();
imagefilledarc($this->image, $this->pie_center_x, $this->pie_center_y, $this->pie_width, $this->pie_height, $arcStart, (360*$value)+$arcStart, $color, IMG_ARC_PIE);
if ($this->bool_data_labels) { $this->generateDataLabel($value, $arcStart); }
$arcStart += 360 * $value;
}
}
function generateDataLabel($value, $arcStart) {
//MIDWAY IF THE MID ARC ANGLE OF THE WEDGE WE JUST DREW
$midway = ($arcStart + (360 * $value) + $arcStart) / 2;
//ADJUST FOR ELLIPSE HEIGHT/WIDTH RATIO
$skew = $this->pie_height_percent / $this->pie_width_percent;
$pi = atan(1.0) * 4.0;
$theta = ($midway / 180) * $pi;
$valueX = $this->pie_center_x + ($this->pie_width / 2 + $this->pie_data_label_space) * cos($theta);
$valueY = $this->pie_center_y + ($this->pie_width / 2 + $this->pie_data_label_space) * sin($theta) * $skew;
$displayValue = $this->formatPercent($value);
$valueArray = $this->dataLabelHandicap($valueX, $valueY, $displayValue, $midway);
$valueX = $valueArray[0];
$valueY = $valueArray[1];
imagestring($this->image, 2, $valueX, $valueY, $displayValue, $this->label_text_color);
}
function formatPercent($input) {
return number_format($input * 100, $this->pie_precision) . '%';
}
function dataLabelHandicap($x, $y, $value, $midway) {
//MOVES DATA LABEL X/Y BASED ON QUADRANT AND LENGTH OF DISPLAYED DATA
//AND HOW TEXT IS DISPLAYED (UPPER LEFT CORNER X/Y)
//EXTRA 1 FOR % SIGN
$lengthOffset = (strlen($value) * ($this->pie_label_text_width)) / 2;
$vertOffset = $this->pie_label_text_height / 2;
if ($midway <= 30) {
$newX = $x - (1.5 * $lengthOffset);
$newY = $y - $vertOffset;
}
else if ($midway > 30 && $midway <= 135) {
$newX = $x - $lengthOffset;
$newY = $y - $vertOffset + $this->pie_3D_height;
}
else if ($midway > 135 && $midway <= 165) {
$newX = $x - $lengthOffset;
$newY = $y - $vertOffset;
}
else if ($midway > 165 && $midway <= 200) {
//VALUE AT RISK FOR BEING OUT OF BOUNDS ON SMALLER GRAPHS
$newX = $x - (1/3 * $lengthOffset);
$newY = $y - $vertOffset;
}
else if ($midway > 200 && $midway <= 330) {
$newX = $x - $lengthOffset;
$newY = $y - $vertOffset;
}
else if ($midway > 330) {
//VALUE AT RISK FOR OVERLAPPING THE LEGEND ON SMALLER GRAPHS
$newX = $x - (1.5 * $lengthOffset);
$newY = $y - $vertOffset;
}
else {
$newX = $x - $lengthOffset;
$newY = $y - $vertOffset;
}
return array($newX, $newY);
}
function generateNextColor($dark = false) {
$array = $this->returnColorArray($this->pie_avail_colors[$this->pie_color_pointer]);
if ($dark) {
//WE ARE TRYING TO GENERATE A DARKER VERSION OF THE EXISTING COLOR
$array[0] *= .8;
$array[1] *= .8;
$array[2] *= .8;
}
$color = imagecolorallocate($this->image, $array[0], $array[1], $array[2]);
$this->pie_color_pointer++;
if ($this->pie_color_pointer >= count($this->pie_avail_colors)) {
$this->pie_color_pointer = 0;
}
return $color;
}
function resetColorPointer() {
$this->pie_color_pointer = 0;
}
function returnColorArray($color) {
//THIS FUNCTION FIRST CHECKS EXISITNG COLORS IN PHPGraphLib
//THEN IF NOT FOUND CHECKS ITS OWN LIST
//COMES WITH VARIOUS PRESET LIGHTER PIE CHART FRIENDLY COLORS
if ($resultColor = PHPGraphLib::returnColorArray($color)) {
return $resultColor;
}
else {
//REMOVE LAST ERROR GENERATED (PHPGraphLib::returnColorArray) SETS ONLY ONE ERROR IF FALSE)
array_pop($this->error);
//CHECK TO SEE IF NUMERIC COLOR PASSED THROUGH IN FORM '128,128,128'
if (strpos($color,',') !== false) {
return explode(',', $color);
}
switch(strtolower($color)) {
//NAMED COLORS BASED ON W3C's RECOMMENDED HTML COLORS
case 'pastel_orange_1': return array(238,197,145); break;
case 'pastel_orange_2': return array(238,180,34); break;
case 'pastel_blue_1': return array(122,197,205); break;
case 'pastel_green_1': return array(102,205,0); break;
case 'pastel_blue_2': return array(125,167,217); break;
case 'pastel_green_2': return array(196,223,155); break;
case 'clay': return array(246,142,85); break;
case 'pastel_yellow': return array(255,247,153); break;
case 'pastel_purple': return array(135,129,189); break;
case 'brown': return array(166,124,81); break;
}
$this->error[] = "Color name \"$color\" not recogized.";
return false;
}
}
function generateTitle() {
//DRAWS TITLE B/T TOP OF GRAPH AND EDGE OF CANVAS
$pieTop = $this->pie_center_y - ($this->pie_height / 2);
if ($this->bool_legend) {
$topElement = ($pieTop < $this->pie_legend_y) ? $pieTop : $this->pie_legend_y;
}
else {
$topElement = $pieTop;
}
if ($topElement < 0) {
$this->error[] = "Not enough room for a title. Increase graph height, or eliminate data values.";
}
else {
$title_y = ($topElement / 2) - ($this->title_char_height / 2);
$title_x = ($this->width / 2) - ((strlen($this->title_text) * $this->title_char_width) / 2);
imagestring($this->image, 2, $title_x , $title_y , $this->title_text, $this->title_color);
}
}
//"PUBLIC" CUSTOMIZATION FUNCTIONS
function setLabelTextColor($color) {
$this->setGenericColor($color, '$this->label_text_color', "Label text color not specified properly.");
}
function setPrecision($digits) {
if (is_int($digits)) { $this->pie_precision = $digits;}
else { $this->error[] = "Integer arg for setPrecision() not specified properly."; }
}
function setDataLabels($bool) {
if (is_bool($bool)) { $this->bool_data_labels = $bool;}
else { $this->error[] = "Boolean arg for setDataLabels() not specified properly."; }
}
//UNUSED PHPGRAPHLIB FUNCTIONS OVERWRITTEN
function generateXAxis(){}
function generateYAxis(){}
function setupXAxis(){}
function setupYAxis(){}
function calcTopMargin(){}
function calcRightMargin(){}
function generateDataPoints(){}
}
?>
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