Graphs
|
|
|
|
<?
/*
Graphite - PHP graphing class (C) C.E Publications
Description: Graphite is a generic php data graphing class.
Version: 0.5
Author: Nathan Cassano <nathan@cjhunter.com>
Homepage: http://www1.cjhunter.com/~nathan/
Example: http://www1.cjhunter.com/~nathan/graphite_exampe.gif
Usage:
$test = new graphite();
$test->filename = "mygif.gif";
$test->width = 400;
$test->height = 300;
$test->y_axis_label = "Meaningless data";
$test->y_lables = xrange(-100, 1000, 50);
$test->x_axis_label = "Days of the Week";
$test->data = array(210, -59, 171, 603, 335, 427, 556);
$test->data_lables = array("Sun", "Mon","Tue","Wed","Thr","Fri","Sat");
$test->init();
$test->prep();
$test->plot(20);
$test->data = array(110, -9, 121, 303, 135, 227, 256);
$test->graph_color = ImageColorAllocate($test->image,0,255,0);
$test->prep();
$test->plot(20);
$test->close();
*/
class graphite {
/* Public variables */
/* filename image is saved as */
var $filename = "graphite.gif";
/* Size of the gif */
var $width = 600;
var $height = 400;
/* Text labels describing the x and y axis */
var $x_axis_label = "x_axis";
var $y_axis_label = "y_axis";
/* The array of integers data to be plotted */
var $data = array();
/* Text labels on the x axis corresponding to each element in $data */
var $data_lables = array();
/* Text labels on the y axis describing the range of the data */
var $y_lables = array();
/* Default font to use when printing */
var $font = 3;
/* Default colors */
var $background_color = 0;
var $border_color = 0;
var $graph_color = 0;
/*
* Private variables (only in thought)
*/
/* image handle */
var $image;
/* The virtual range within that the data is displayed on the graph */
var $y_range_pos;
var $y_range_neg;
/* cooridnate the x axis is graphed */
var $x_axis;
/* Width and Height in pixels of the plotting area */
var $plotarea_width;
var $plotarea_height;
/* Array of Plotted data in (x,y) format */
var $plotted_data = array();
/*
* Defacto Data class constructor
*/
function init()
{
/* Create image handle */
$this->image = imagecreate($this->width, $this->height);
/* Allocate Standard Colors */
$this->background_color = ImageColorAllocate($this->image, 255,255,255);
$this->border_color = ImageColorAllocate($this->image, 0,0,0);
$this->graph_color = ImageColorAllocate($this->image, 0,0,255);
/* Find longest string of the y_lables */
$longest = strlen(max($this->y_lables));
$this->plotarea_width = $this->width - 35 - ($longest * 7);
$this->plotarea_height = $this->height - 50;
/* Set the display range */
if(!isset($this->y_range_pos))
{
$this->y_range_pos = max($this->y_lables);
}
if(!isset($this->y_range_neg))
{
$this->y_range_neg = abs(min($this->y_lables));
}
/* Calculate where to graph the x axis */
$this->x_axis = ($this->y_range_pos / ($this->y_range_pos + $this->y_range_neg)) * $this->plotarea_height;
/* Draw Background */
imagefilledrectangle($this->image,
0,0,$this->width - 1, $this->height - 1,
$this->background_color);
/* Draw y axis label */
imagestringup($this->image, $this->font,
10, ($this->plotarea_height / 2) + (strlen($this->y_axis_label) * 3.5), $this->y_axis_label,
$this->border_color);
/* Draw x axis label */
imagestring($this->image, $this->font,
(($this->width - $this->plotarea_width) + $this->plotarea_width / 2) - (strlen($this->x_axis_label) * 3.5),
$this->height - 25, $this->x_axis_label, $this->border_color);
/* Draw plot borders */
imageline($this->image,
$this->width - $this->plotarea_width, 0,
$this->width - $this->plotarea_width, $this->plotarea_height, $this->border_color);
imageline($this->image,
$this->width - $this->plotarea_width, $this->plotarea_height,
$this->width, $this->plotarea_height, $this->border_color);
/* Draw x axis*/
imageline($this->image,
$this->width - $this->plotarea_width, $this->x_axis,
$this->width, $this->x_axis, $this->border_color);
/* Draw y lables, if present */
if($num_lable = count($this->y_lables))
{
reset($this->y_lables);
/* Calculate the space between each label */
$label_space = $this->plotarea_height / ($num_lable - 1);
for($y = $this->plotarea_height; $y > -1; $y = $y - $label_space)
{
$label = current($this->y_lables);
$left_offset = strlen($label) * 7;
/* Write label string */
imagestring($this->image, $this->font,
$this->width - $this->plotarea_width - $left_offset - 4, $y - 1,
$label, $this->border_color);
/* Draw Data marker */
imageline($this->image,
$this->width - $this->plotarea_width - 2, $y,
$this->width - $this->plotarea_width, $y,
$this->border_color);
next($this->y_lables);
}
}
/* Draw data lables, if present */
if($num_lable = count($this->data_lables))
{
current($this->data_lables);
/* Calculate the space between each label */
$label_space = $this->plotarea_width / ($num_lable + 1);
for($x = ($this->width - $this->plotarea_width) + $label_space; $x < $this->width; $x = $x + $label_space)
{
$label = current($this->data_lables);
$left_offset = (strlen($label) * 6) / 2;
/* Write label string */
imageline($this->image,
$x, $this->plotarea_height,
$x, $this->plotarea_height + 2,
$this->border_color);
/* Draw Data marker */
imagestring($this->image, $this->font,
$x - $left_offset, $this->plotarea_height + 4,
$label, $this->border_color);
next($this->data_lables);
}
}
}
/*
* Plot data to plotted_data
*/
function prep()
{
/* If data_lables present get spacing from data_lables */
if($num_lable = count($this->data_lables))
{
$label_space = $this->plotarea_width / ($num_lable + 1);
/* If data present get spacing from data */
}elseif($num_lable = count($this->data)){
$label_space = $this->plotarea_width / ($num_lable + 1);
}else{
echo "Error: No data to prepare";
exit;
}
reset($this->data);
$plotted_index = 0;
for($x = ($this->width - $this->plotarea_width) + $label_space; $x < $this->width; $x = $x + $label_space)
{
$data_entry = current($this->data);
/* if data_entry off the top of the chart, clip it */
if($data_entry > $this->y_range_pos)
{$data_entry = $this->y_range_pos;}
/* if data_entry off the bottom of the chart, clip it */
if($data_entry < ($this->y_range_neg * -1))
{$data_entry = $this->y_range_neg * -1;}
if($data_entry >= 0)
{
$y = $this->x_axis - ($this->x_axis * ($data_entry / $this->y_range_pos));
}else{
$y = $this->x_axis + (($this->plotarea_height - $this->x_axis) * (($data_entry * -1) / $this->y_range_neg));
}
/* Write plotting data to plotted_data variable */
$this->plotted_data[$plotted_index] = array($x, $y);
$plotted_index++;
next($this->data);
}
}
/*
* Plot data to image as solid bars
*/
function plot($bar_width = 10)
{
reset($this->plotted_data);
$bar_width = $bar_width / 2;
while(list($x, $y) = current($this->plotted_data))
{
if($y < $this->x_axis)
{
imagefilledrectangle($this->image,
$x - $bar_width, $y,
$x + $bar_width, $this->x_axis,
$this->graph_color);
}else{
imagefilledrectangle($this->image,
$x - $bar_width, $this->x_axis,
$x + $bar_width, $y,
$this->graph_color);
}
next($this->plotted_data);
}
}
/*
* Save file and free memory
*/
function close()
{
imagegif($this->image, $this->filename);
imagedestroy($this->image);
}
}
/*
* graphite_line Class extend plot() function
*/
class graphite_line extends graphite
{
function plot()
{
$count = count($this->plotted_data);
reset($this->plotted_data);
$y_last = $this->x_axis;
list($x_last, $junk) = current($this->plotted_data);
reset($this->plotted_data);
for($i = 0; $i < $count; $i++)
{
list($x_next, $y_next) = current($this->plotted_data);
imageline($this->image,
$x_next, $y_next,
$x_last, $y_last,
$this->graph_color);
$x_last = $x_next;
$y_last = $y_next;
next($this->plotted_data);
}
imageline($this->image,
$x_last, $y_last,
$x_next, $this->x_axis,
$this->graph_color);
}
}
/*
* graphite_area Class extend plot() function
*/
class graphite_area extends graphite
{
function plot()
{
reset($this->plotted_data);
list($x, $y) = current($this->plotted_data);
$poly[] = $x;
$poly[] = $this->x_axis;
reset($this->plotted_data);
while(list($x, $y) = current($this->plotted_data))
{
$poly[] = $x;
$poly[] = $y;
$x_last = $x;
next($this->plotted_data);
}
$poly[] = $x_last;
$poly[] = $this->x_axis;
imagefilledpolygon($this->image,
$poly,
count($poly) / 2,
$this->graph_color);
}
}
/*
* Returns an array of integers given a range
*/
function xrange($begin, $end, $step = 1)
{
if($begin > $end){
if($step >= 0) {echo "Error: 'step' argument is positive or zero"; exit;}
for($i = $begin; $i >= $end; $i = $i + $step)
{$range[] = $i;}
}else{
if($step <= 0){echo "Error: 'step' argument is negitive or zero"; exit;}
for($i = $begin; $i <= $end; $i = $i + $step)
{$range[] = $i;}
}
return $range;
}
?>
|
|
|
Usage Example
|
$test = new graphite();
$test->filename = "mygif.gif";
$test->width = 400;
$test->height = 300;
$test->y_axis_label = "Meaningless data";
$test->y_lables = xrange(-100, 1000, 50);
$test->x_axis_label = "Days of the Week";
$test->data = array(210, -59, 171, 603, 335, 427, 556);
$test->data_lables = array("Sun", "Mon","Tue","Wed","Thr","Fri","Sat");
$test->init();
$test->prep();
$test->plot(20);
$test->data = array(110, -9, 121, 303, 135, 227, 256);
$test->graph_color = ImageColorAllocate($test->image,0,255,0);
$test->prep();
$test->plot(20);
$test->close();
|
|
|
Rate This Script
|
|
|
|
Store
Your email: