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graphlib.php
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graphlib.php
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<?php
/**
* Graph Class. PHP Class to draw line, point, bar, and area graphs, including numeric x-axis and double y-axis.
* Version: 1.6.3
* Copyright (C) 2000 Herman Veluwenkamp
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Copy of GNU Lesser General Public License at: http://www.gnu.org/copyleft/lesser.txt
* Contact author at: hermanV@mindless.com
*
* @package moodlecore
*/
/* This file contains modifications by Martin Dougiamas
* as part of Moodle (http://moodle.com). Modified lines
* are marked with "Moodle".
*/
/**
* @package moodlecore
*/
class graph {
var $image;
var $debug = FALSE; // be careful!!
var $calculated = array(); // array of computed values for chart
var $parameter = array( // input parameters
'width' => 320, // default width of image
'height' => 240, // default height of image
'file_name' => 'none', // name of file for file to be saved as.
// NOTE: no suffix required. this is determined from output_format below.
'output_format' => 'PNG', // image output format. 'GIF', 'PNG', 'JPEG'. default 'PNG'.
'seconds_to_live' => 0, // expiry time in seconds (for HTTP header)
'hours_to_live' => 0, // expiry time in hours (for HTTP header)
'path_to_fonts' => 'fonts/', // path to fonts folder. don't forget *trailing* slash!!
// for WINDOZE this may need to be the full path, not relative.
'title' => 'Graph Title', // text for graph title
'title_font' => 'default.ttf', // title text font. don't forget to set 'path_to_fonts' above.
'title_size' => 16, // title text point size
'title_colour' => 'black', // colour for title text
'x_label' => '', // if this is set then this text is printed on bottom axis of graph.
'y_label_left' => '', // if this is set then this text is printed on left axis of graph.
'y_label_right' => '', // if this is set then this text is printed on right axis of graph.
'label_size' => 8, // label text point size
'label_font' => 'default.ttf', // label text font. don't forget to set 'path_to_fonts' above.
'label_colour' => 'gray33', // label text colour
'y_label_angle' => 90, // rotation of y axis label
'x_label_angle' => 90, // rotation of y axis label
'outer_padding' => 5, // padding around outer text. i.e. title, y label, and x label.
'inner_padding' => 0, // padding beteen axis text and graph.
'x_inner_padding' => 5, // padding beteen axis text and graph.
'y_inner_padding' => 6, // padding beteen axis text and graph.
'outer_border' => 'none', // colour of border aound image, or 'none'.
'inner_border' => 'black', // colour of border around actual graph, or 'none'.
'inner_border_type' => 'box', // 'box' for all four sides, 'axis' for x/y axis only,
// 'y' or 'y-left' for y axis only, 'y-right' for right y axis only,
// 'x' for x axis only, 'u' for both left and right y axis and x axis.
'outer_background' => 'none', // background colour of entire image.
'inner_background' => 'none', // background colour of plot area.
'y_min_left' => 0, // this will be reset to minimum value if there is a value lower than this.
'y_max_left' => 0, // this will be reset to maximum value if there is a value higher than this.
'y_min_right' => 0, // this will be reset to minimum value if there is a value lower than this.
'y_max_right' => 0, // this will be reset to maximum value if there is a value higher than this.
'x_min' => 0, // only used if x axis is numeric.
'x_max' => 0, // only used if x axis is numeric.
'y_resolution_left' => 1, // scaling for rounding of y axis max value.
// if max y value is 8645 then
// if y_resolution is 0, then y_max becomes 9000.
// if y_resolution is 1, then y_max becomes 8700.
// if y_resolution is 2, then y_max becomes 8650.
// if y_resolution is 3, then y_max becomes 8645.
// get it?
'y_decimal_left' => 0, // number of decimal places for y_axis text.
'y_resolution_right' => 2, // ... same for right hand side
'y_decimal_right' => 0, // ... same for right hand side
'x_resolution' => 2, // only used if x axis is numeric.
'x_decimal' => 0, // only used if x axis is numeric.
'point_size' => 4, // default point size. use even number for diamond or triangle to get nice look.
'brush_size' => 4, // default brush size for brush line.
'brush_type' => 'circle', // type of brush to use to draw line. choose from the following
// 'circle', 'square', 'horizontal', 'vertical', 'slash', 'backslash'
'bar_size' => 0.8, // size of bar to draw. <1 bars won't touch
// 1 is full width - i.e. bars will touch.
// >1 means bars will overlap.
'bar_spacing' => 10, // space in pixels between group of bars for each x value.
'shadow_offset' => 3, // draw shadow at this offset, unless overidden by data parameter.
'shadow' => 'grayCC', // 'none' or colour of shadow.
'shadow_below_axis' => true, // whether to draw shadows of bars and areas below the x/zero axis.
'x_axis_gridlines' => 'auto', // if set to a number then x axis is treated as numeric.
'y_axis_gridlines' => 6, // number of gridlines on y axis.
'zero_axis' => 'none', // colour to draw zero-axis, or 'none'.
'axis_font' => 'default.ttf', // axis text font. don't forget to set 'path_to_fonts' above.
'axis_size' => 8, // axis text font size in points
'axis_colour' => 'gray33', // colour of axis text.
'y_axis_angle' => 0, // rotation of axis text.
'x_axis_angle' => 0, // rotation of axis text.
'y_axis_text_left' => 1, // whether to print left hand y axis text. if 0 no text, if 1 all ticks have text,
'x_axis_text' => 1, // if 4 then print every 4th tick and text, etc...
'y_axis_text_right' => 0, // behaviour same as above for right hand y axis.
'x_offset' => 0.5, // x axis tick offset from y axis as fraction of tick spacing.
'y_ticks_colour' => 'black', // colour to draw y ticks, or 'none'
'x_ticks_colour' => 'black', // colour to draw x ticks, or 'none'
'y_grid' => 'line', // grid lines. set to 'line' or 'dash'...
'x_grid' => 'line', // or if set to 'none' print nothing.
'grid_colour' => 'grayEE', // default grid colour.
'tick_length' => 4, // length of ticks in pixels. can be negative. i.e. outside data drawing area.
'legend' => 'none', // default. no legend.
// otherwise: 'top-left', 'top-right', 'bottom-left', 'bottom-right',
// 'outside-top', 'outside-bottom', 'outside-left', or 'outside-right'.
'legend_offset' => 10, // offset in pixels from graph or outside border.
'legend_padding' => 5, // padding around legend text.
'legend_font' => 'default.ttf', // legend text font. don't forget to set 'path_to_fonts' above.
'legend_size' => 8, // legend text point size.
'legend_colour' => 'black', // legend text colour.
'legend_border' => 'none', // legend border colour, or 'none'.
'decimal_point' => '.', // symbol for decimal separation '.' or ',' *european support.
'thousand_sep' => ',', // symbol for thousand separation ',' or ''
);
var $y_tick_labels = null; // array of text values for y-axis tick labels
var $offset_relation = null; // array of offsets for different sets of data
// init all text - title, labels, and axis text.
function init() {
/// Moodle mods: overrides the font path and encodings
global $CFG;
/// A default.ttf is searched for in this order:
/// dataroot/lang/xx_local/fonts
/// dataroot/lang/xx/fonts
/// dirroot/lang/xx/fonts
/// dataroot/lang
/// lib/
$currlang = current_language();
if (file_exists("$CFG->dataroot/lang/".$currlang."_local/fonts/default.ttf")) {
$fontpath = "$CFG->dataroot/lang/".$currlang."_local/fonts/";
} else if (file_exists("$CFG->dataroot/lang/$currlang/fonts/default.ttf")) {
$fontpath = "$CFG->dataroot/lang/$currlang/fonts/";
} else if (file_exists("$CFG->dirroot/lang/$currlang/fonts/default.ttf")) {
$fontpath = "$CFG->dirroot/lang/$currlang/fonts/";
} else if (file_exists("$CFG->dataroot/lang/default.ttf")) {
$fontpath = "$CFG->dataroot/lang/";
} else {
$fontpath = "$CFG->libdir/";
}
$this->parameter['path_to_fonts'] = $fontpath;
/// End Moodle mods
$this->calculated['outer_border'] = $this->calculated['boundary_box'];
// outer padding
$this->calculated['boundary_box']['left'] += $this->parameter['outer_padding'];
$this->calculated['boundary_box']['top'] += $this->parameter['outer_padding'];
$this->calculated['boundary_box']['right'] -= $this->parameter['outer_padding'];
$this->calculated['boundary_box']['bottom'] -= $this->parameter['outer_padding'];
$this->init_x_axis();
$this->init_y_axis();
$this->init_legend();
$this->init_labels();
// take into account tick lengths
$this->calculated['bottom_inner_padding'] = $this->parameter['x_inner_padding'];
if (($this->parameter['x_ticks_colour'] != 'none') && ($this->parameter['tick_length'] < 0))
$this->calculated['bottom_inner_padding'] -= $this->parameter['tick_length'];
$this->calculated['boundary_box']['bottom'] -= $this->calculated['bottom_inner_padding'];
$this->calculated['left_inner_padding'] = $this->parameter['y_inner_padding'];
if ($this->parameter['y_axis_text_left']) {
if (($this->parameter['y_ticks_colour'] != 'none') && ($this->parameter['tick_length'] < 0))
$this->calculated['left_inner_padding'] -= $this->parameter['tick_length'];
}
$this->calculated['boundary_box']['left'] += $this->calculated['left_inner_padding'];
$this->calculated['right_inner_padding'] = $this->parameter['y_inner_padding'];
if ($this->parameter['y_axis_text_right']) {
if (($this->parameter['y_ticks_colour'] != 'none') && ($this->parameter['tick_length'] < 0))
$this->calculated['right_inner_padding'] -= $this->parameter['tick_length'];
}
$this->calculated['boundary_box']['right'] -= $this->calculated['right_inner_padding'];
// boundaryBox now has coords for plotting area.
$this->calculated['inner_border'] = $this->calculated['boundary_box'];
$this->init_data();
$this->init_x_ticks();
$this->init_y_ticks();
}
function draw_text() {
$colour = $this->parameter['outer_background'];
if ($colour != 'none') $this->draw_rectangle($this->calculated['outer_border'], $colour, 'fill'); // graph background
// draw border around image
$colour = $this->parameter['outer_border'];
if ($colour != 'none') $this->draw_rectangle($this->calculated['outer_border'], $colour, 'box'); // graph border
$this->draw_title();
$this->draw_x_label();
$this->draw_y_label_left();
$this->draw_y_label_right();
$this->draw_x_axis();
$this->draw_y_axis();
if ($this->calculated['y_axis_left']['has_data']) $this->draw_zero_axis_left(); // either draw zero axis on left
else if ($this->calculated['y_axis_right']['has_data']) $this->draw_zero_axis_right(); // ... or right.
$this->draw_legend();
// draw border around plot area
$colour = $this->parameter['inner_background'];
if ($colour != 'none') $this->draw_rectangle($this->calculated['inner_border'], $colour, 'fill'); // graph background
// draw border around image
$colour = $this->parameter['inner_border'];
if ($colour != 'none') $this->draw_rectangle($this->calculated['inner_border'], $colour, $this->parameter['inner_border_type']); // graph border
}
function draw_stack() {
$this->init();
$this->draw_text();
$yOrder = $this->y_order; // save y_order data.
// iterate over each data set. order is very important if you want to see data correctly. remember shadows!!
foreach ($yOrder as $set) {
$this->y_order = array($set);
$this->init_data();
$this->draw_data();
}
$this->y_order = $yOrder; // revert y_order data.
$this->output();
}
function draw() {
$this->init();
$this->draw_text();
$this->draw_data();
$this->output();
}
// draw a data set
function draw_set($order, $set, $offset) {
if ($offset) @$this->init_variable($colour, $this->y_format[$set]['shadow'], $this->parameter['shadow']);
else $colour = $this->y_format[$set]['colour'];
@$this->init_variable($point, $this->y_format[$set]['point'], 'none');
@$this->init_variable($pointSize, $this->y_format[$set]['point_size'], $this->parameter['point_size']);
@$this->init_variable($line, $this->y_format[$set]['line'], 'none');
@$this->init_variable($brushType, $this->y_format[$set]['brush_type'], $this->parameter['brush_type']);
@$this->init_variable($brushSize, $this->y_format[$set]['brush_size'], $this->parameter['brush_size']);
@$this->init_variable($bar, $this->y_format[$set]['bar'], 'none');
@$this->init_variable($barSize, $this->y_format[$set]['bar_size'], $this->parameter['bar_size']);
@$this->init_variable($area, $this->y_format[$set]['area'], 'none');
$lastX = 0;
$lastY = 'none';
$fromX = 0;
$fromY = 'none';
//print "set $set<br />";
//expand_pre($this->calculated['y_plot']);
foreach ($this->x_data as $index => $x) {
//print "index $index<br />";
$thisY = $this->calculated['y_plot'][$set][$index];
$thisX = $this->calculated['x_plot'][$index];
//print "$thisX, $thisY <br />";
if (($bar!='none') && (string)$thisY != 'none') {
if ($relatedset = $this->offset_relation[$set]) { // Moodle
$yoffset = $this->calculated['y_plot'][$relatedset][$index]; // Moodle
} else { // Moodle
$yoffset = 0; // Moodle
} // Moodle
//$this->bar($thisX, $thisY, $bar, $barSize, $colour, $offset, $set); // Moodle
$this->bar($thisX, $thisY, $bar, $barSize, $colour, $offset, $set, $yoffset); // Moodle
}
if (($area!='none') && (((string)$lastY != 'none') && ((string)$thisY != 'none')))
$this->area($lastX, $lastY, $thisX, $thisY, $area, $colour, $offset);
if (($point!='none') && (string)$thisY != 'none') $this->plot($thisX, $thisY, $point, $pointSize, $colour, $offset);
if (($line!='none') && ((string)$thisY != 'none')) {
if ((string)$fromY != 'none')
$this->line($fromX, $fromY, $thisX, $thisY, $line, $brushType, $brushSize, $colour, $offset);
$fromY = $thisY; // start next line from here
$fromX = $thisX; // ...
} else {
$fromY = 'none';
$fromX = 'none';
}
$lastX = $thisX;
$lastY = $thisY;
}
}
function draw_data() {
// cycle thru y data to be plotted
// first check for drop shadows...
foreach ($this->y_order as $order => $set) {
@$this->init_variable($offset, $this->y_format[$set]['shadow_offset'], $this->parameter['shadow_offset']);
@$this->init_variable($colour, $this->y_format[$set]['shadow'], $this->parameter['shadow']);
if ($colour != 'none') $this->draw_set($order, $set, $offset);
}
// then draw data
foreach ($this->y_order as $order => $set) {
$this->draw_set($order, $set, 0);
}
}
function draw_legend() {
$position = $this->parameter['legend'];
if ($position == 'none') return; // abort if no border
$borderColour = $this->parameter['legend_border'];
$offset = $this->parameter['legend_offset'];
$padding = $this->parameter['legend_padding'];
$height = $this->calculated['legend']['boundary_box_all']['height'];
$width = $this->calculated['legend']['boundary_box_all']['width'];
$graphTop = $this->calculated['boundary_box']['top'];
$graphBottom = $this->calculated['boundary_box']['bottom'];
$graphLeft = $this->calculated['boundary_box']['left'];
$graphRight = $this->calculated['boundary_box']['right'];
$outsideRight = $this->calculated['outer_border']['right'];
$outsideBottom = $this->calculated['outer_border']['bottom'];
switch ($position) {
case 'top-left':
$top = $graphTop + $offset;
$bottom = $graphTop + $height + $offset;
$left = $graphLeft + $offset;
$right = $graphLeft + $width + $offset;
break;
case 'top-right':
$top = $graphTop + $offset;
$bottom = $graphTop + $height + $offset;
$left = $graphRight - $width - $offset;
$right = $graphRight - $offset;
break;
case 'bottom-left':
$top = $graphBottom - $height - $offset;
$bottom = $graphBottom - $offset;
$left = $graphLeft + $offset;
$right = $graphLeft + $width + $offset;
break;
case 'bottom-right':
$top = $graphBottom - $height - $offset;
$bottom = $graphBottom - $offset;
$left = $graphRight - $width - $offset;
$right = $graphRight - $offset;
break;
case 'outside-top' :
$top = $graphTop;
$bottom = $graphTop + $height;
$left = $outsideRight - $width - $offset;
$right = $outsideRight - $offset;
break;
case 'outside-bottom' :
$top = $graphBottom - $height;
$bottom = $graphBottom;
$left = $outsideRight - $width - $offset;
$right = $outsideRight - $offset;
break;
case 'outside-left' :
$top = $outsideBottom - $height - $offset;
$bottom = $outsideBottom - $offset;
$left = $graphLeft;
$right = $graphLeft + $width;
break;
case 'outside-right' :
$top = $outsideBottom - $height - $offset;
$bottom = $outsideBottom - $offset;
$left = $graphRight - $width;
$right = $graphRight;
break;
default: // default is top left. no particular reason.
$top = $this->calculated['boundary_box']['top'];
$bottom = $this->calculated['boundary_box']['top'] + $this->calculated['legend']['boundary_box_all']['height'];
$left = $this->calculated['boundary_box']['left'];
$right = $this->calculated['boundary_box']['right'] + $this->calculated['legend']['boundary_box_all']['width'];
}
// legend border
if($borderColour!='none') $this->draw_rectangle(array('top' => $top,
'left' => $left,
'bottom' => $bottom,
'right' => $right), $this->parameter['legend_border'], 'box');
// legend text
$legendText = array('points' => $this->parameter['legend_size'],
'angle' => 0,
'font' => $this->parameter['legend_font'],
'colour' => $this->parameter['legend_colour']);
$box = $this->calculated['legend']['boundary_box_max']['height']; // use max height for legend square size.
$x = $left + $padding;
$x_text = $x + $box * 2;
$y = $top + $padding;
foreach ($this->y_order as $set) {
$legendText['text'] = $this->calculated['legend']['text'][$set];
if ($legendText['text'] != 'none') {
// if text exists then draw box and text
$boxColour = $this->colour[$this->y_format[$set]['colour']];
// draw box
ImageFilledRectangle($this->image, $x, $y, $x + $box, $y + $box, $boxColour);
// draw text
$coords = array('x' => $x + $box * 2, 'y' => $y, 'reference' => 'top-left');
$legendText['boundary_box'] = $this->calculated['legend']['boundary_box'][$set];
$this->update_boundaryBox($legendText['boundary_box'], $coords);
$this->print_TTF($legendText);
$y += $padding + $box;
}
}
}
function draw_y_label_right() {
if (!$this->parameter['y_label_right']) return;
$x = $this->calculated['boundary_box']['right'] + $this->parameter['y_inner_padding'];
if ($this->parameter['y_axis_text_right']) $x += $this->calculated['y_axis_right']['boundary_box_max']['width']
+ $this->calculated['right_inner_padding'];
$y = ($this->calculated['boundary_box']['bottom'] + $this->calculated['boundary_box']['top']) / 2;
$label = $this->calculated['y_label_right'];
$coords = array('x' => $x, 'y' => $y, 'reference' => 'left-center');
$this->update_boundaryBox($label['boundary_box'], $coords);
$this->print_TTF($label);
}
function draw_y_label_left() {
if (!$this->parameter['y_label_left']) return;
$x = $this->calculated['boundary_box']['left'] - $this->parameter['y_inner_padding'];
if ($this->parameter['y_axis_text_left']) $x -= $this->calculated['y_axis_left']['boundary_box_max']['width']
+ $this->calculated['left_inner_padding'];
$y = ($this->calculated['boundary_box']['bottom'] + $this->calculated['boundary_box']['top']) / 2;
$label = $this->calculated['y_label_left'];
$coords = array('x' => $x, 'y' => $y, 'reference' => 'right-center');
$this->update_boundaryBox($label['boundary_box'], $coords);
$this->print_TTF($label);
}
function draw_title() {
if (!$this->parameter['title']) return;
//$y = $this->calculated['outside_border']['top'] + $this->parameter['outer_padding'];
$y = $this->calculated['boundary_box']['top'] - $this->parameter['outer_padding'];
$x = ($this->calculated['boundary_box']['right'] + $this->calculated['boundary_box']['left']) / 2;
$label = $this->calculated['title'];
$coords = array('x' => $x, 'y' => $y, 'reference' => 'bottom-center');
$this->update_boundaryBox($label['boundary_box'], $coords);
$this->print_TTF($label);
}
function draw_x_label() {
if (!$this->parameter['x_label']) return;
$y = $this->calculated['boundary_box']['bottom'] + $this->parameter['x_inner_padding'];
if ($this->parameter['x_axis_text']) $y += $this->calculated['x_axis']['boundary_box_max']['height']
+ $this->calculated['bottom_inner_padding'];
$x = ($this->calculated['boundary_box']['right'] + $this->calculated['boundary_box']['left']) / 2;
$label = $this->calculated['x_label'];
$coords = array('x' => $x, 'y' => $y, 'reference' => 'top-center');
$this->update_boundaryBox($label['boundary_box'], $coords);
$this->print_TTF($label);
}
function draw_zero_axis_left() {
$colour = $this->parameter['zero_axis'];
if ($colour == 'none') return;
// draw zero axis on left hand side
$this->calculated['zero_axis'] = round($this->calculated['boundary_box']['top'] + ($this->calculated['y_axis_left']['max'] * $this->calculated['y_axis_left']['factor']));
ImageLine($this->image, $this->calculated['boundary_box']['left'], $this->calculated['zero_axis'], $this->calculated['boundary_box']['right'], $this->calculated['zero_axis'], $this->colour[$colour]);
}
function draw_zero_axis_right() {
$colour = $this->parameter['zero_axis'];
if ($colour == 'none') return;
// draw zero axis on right hand side
$this->calculated['zero_axis'] = round($this->calculated['boundary_box']['top'] + ($this->calculated['y_axis_right']['max'] * $this->calculated['y_axis_right']['factor']));
ImageLine($this->image, $this->calculated['boundary_box']['left'], $this->calculated['zero_axis'], $this->calculated['boundary_box']['right'], $this->calculated['zero_axis'], $this->colour[$colour]);
}
function draw_x_axis() {
$gridColour = $this->colour[$this->parameter['grid_colour']];
$tickColour = $this->colour[$this->parameter['x_ticks_colour']];
$axis_colour = $this->parameter['axis_colour'];
$xGrid = $this->parameter['x_grid'];
$gridTop = $this->calculated['boundary_box']['top'];
$gridBottom = $this->calculated['boundary_box']['bottom'];
if ($this->parameter['tick_length'] >= 0) {
$tickTop = $this->calculated['boundary_box']['bottom'] - $this->parameter['tick_length'];
$tickBottom = $this->calculated['boundary_box']['bottom'];
$textBottom = $tickBottom + $this->calculated['bottom_inner_padding'];
} else {
$tickTop = $this->calculated['boundary_box']['bottom'];
$tickBottom = $this->calculated['boundary_box']['bottom'] - $this->parameter['tick_length'];
$textBottom = $tickBottom + $this->calculated['bottom_inner_padding'];
}
$axis_font = $this->parameter['axis_font'];
$axis_size = $this->parameter['axis_size'];
$axis_angle = $this->parameter['x_axis_angle'];
if ($axis_angle == 0) $reference = 'top-center';
if ($axis_angle > 0) $reference = 'top-right';
if ($axis_angle < 0) $reference = 'top-left';
if ($axis_angle == 90) $reference = 'top-center';
//generic tag information. applies to all axis text.
$axisTag = array('points' => $axis_size, 'angle' => $axis_angle, 'font' => $axis_font, 'colour' => $axis_colour);
foreach ($this->calculated['x_axis']['tick_x'] as $set => $tickX) {
// draw x grid if colour specified
if ($xGrid != 'none') {
switch ($xGrid) {
case 'line':
ImageLine($this->image, round($tickX), round($gridTop), round($tickX), round($gridBottom), $gridColour);
break;
case 'dash':
ImageDashedLine($this->image, round($tickX), round($gridTop), round($tickX), round($gridBottom), $gridColour);
break;
}
}
if ($this->parameter['x_axis_text'] && !($set % $this->parameter['x_axis_text'])) { // test if tick should be displayed
// draw tick
if ($tickColour != 'none')
ImageLine($this->image, round($tickX), round($tickTop), round($tickX), round($tickBottom), $tickColour);
// draw axis text
$coords = array('x' => $tickX, 'y' => $textBottom, 'reference' => $reference);
$axisTag['text'] = $this->calculated['x_axis']['text'][$set];
$axisTag['boundary_box'] = $this->calculated['x_axis']['boundary_box'][$set];
$this->update_boundaryBox($axisTag['boundary_box'], $coords);
$this->print_TTF($axisTag);
}
}
}
function draw_y_axis() {
$gridColour = $this->colour[$this->parameter['grid_colour']];
$tickColour = $this->colour[$this->parameter['y_ticks_colour']];
$axis_colour = $this->parameter['axis_colour'];
$yGrid = $this->parameter['y_grid'];
$gridLeft = $this->calculated['boundary_box']['left'];
$gridRight = $this->calculated['boundary_box']['right'];
// axis font information
$axis_font = $this->parameter['axis_font'];
$axis_size = $this->parameter['axis_size'];
$axis_angle = $this->parameter['y_axis_angle'];
$axisTag = array('points' => $axis_size, 'angle' => $axis_angle, 'font' => $axis_font, 'colour' => $axis_colour);
if ($this->calculated['y_axis_left']['has_data']) {
// LEFT HAND SIDE
// left and right coords for ticks
if ($this->parameter['tick_length'] >= 0) {
$tickLeft = $this->calculated['boundary_box']['left'];
$tickRight = $this->calculated['boundary_box']['left'] + $this->parameter['tick_length'];
} else {
$tickLeft = $this->calculated['boundary_box']['left'] + $this->parameter['tick_length'];
$tickRight = $this->calculated['boundary_box']['left'];
}
$textRight = $tickLeft - $this->calculated['left_inner_padding'];
if ($axis_angle == 0) $reference = 'right-center';
if ($axis_angle > 0) $reference = 'right-top';
if ($axis_angle < 0) $reference = 'right-bottom';
if ($axis_angle == 90) $reference = 'right-center';
foreach ($this->calculated['y_axis']['tick_y'] as $set => $tickY) {
// draw y grid if colour specified
if ($yGrid != 'none') {
switch ($yGrid) {
case 'line':
ImageLine($this->image, round($gridLeft), round($tickY), round($gridRight), round($tickY), $gridColour);
break;
case 'dash':
ImageDashedLine($this->image, round($gridLeft), round($tickY), round($gridRight), round($tickY), $gridColour);
break;
}
}
// y axis text
if ($this->parameter['y_axis_text_left'] && !($set % $this->parameter['y_axis_text_left'])) { // test if tick should be displayed
// draw tick
if ($tickColour != 'none')
ImageLine($this->image, round($tickLeft), round($tickY), round($tickRight), round($tickY), $tickColour);
// draw axis text...
$coords = array('x' => $textRight, 'y' => $tickY, 'reference' => $reference);
$axisTag['text'] = $this->calculated['y_axis_left']['text'][$set];
$axisTag['boundary_box'] = $this->calculated['y_axis_left']['boundary_box'][$set];
$this->update_boundaryBox($axisTag['boundary_box'], $coords);
$this->print_TTF($axisTag);
}
}
}
if ($this->calculated['y_axis_right']['has_data']) {
// RIGHT HAND SIDE
// left and right coords for ticks
if ($this->parameter['tick_length'] >= 0) {
$tickLeft = $this->calculated['boundary_box']['right'] - $this->parameter['tick_length'];
$tickRight = $this->calculated['boundary_box']['right'];
} else {
$tickLeft = $this->calculated['boundary_box']['right'];
$tickRight = $this->calculated['boundary_box']['right'] - $this->parameter['tick_length'];
}
$textLeft = $tickRight+ $this->calculated['left_inner_padding'];
if ($axis_angle == 0) $reference = 'left-center';
if ($axis_angle > 0) $reference = 'left-bottom';
if ($axis_angle < 0) $reference = 'left-top';
if ($axis_angle == 90) $reference = 'left-center';
foreach ($this->calculated['y_axis']['tick_y'] as $set => $tickY) {
if (!$this->calculated['y_axis_left']['has_data'] && $yGrid != 'none') { // draw grid if not drawn already (above)
switch ($yGrid) {
case 'line':
ImageLine($this->image, round($gridLeft), round($tickY), round($gridRight), round($tickY), $gridColour);
break;
case 'dash':
ImageDashedLine($this->image, round($gridLeft), round($tickY), round($gridRight), round($tickY), $gridColour);
break;
}
}
if ($this->parameter['y_axis_text_right'] && !($set % $this->parameter['y_axis_text_right'])) { // test if tick should be displayed
// draw tick
if ($tickColour != 'none')
ImageLine($this->image, round($tickLeft), round($tickY), round($tickRight), round($tickY), $tickColour);
// draw axis text...
$coords = array('x' => $textLeft, 'y' => $tickY, 'reference' => $reference);
$axisTag['text'] = $this->calculated['y_axis_right']['text'][$set];
$axisTag['boundary_box'] = $this->calculated['y_axis_left']['boundary_box'][$set];
$this->update_boundaryBox($axisTag['boundary_box'], $coords);
$this->print_TTF($axisTag);
}
}
}
}
function init_data() {
$this->calculated['y_plot'] = array(); // array to hold pixel plotting coords for y axis
$height = $this->calculated['boundary_box']['bottom'] - $this->calculated['boundary_box']['top'];
$width = $this->calculated['boundary_box']['right'] - $this->calculated['boundary_box']['left'];
// calculate pixel steps between axis ticks.
$this->calculated['y_axis']['step'] = $height / ($this->parameter['y_axis_gridlines'] - 1);
// calculate x ticks spacing taking into account x offset for ticks.
$extraTick = 2 * $this->parameter['x_offset']; // extra tick to account for padding
$numTicks = $this->calculated['x_axis']['num_ticks'] - 1; // number of x ticks
// Hack by rodger to avoid division by zero, see bug 1231
if ($numTicks==0) $numTicks=1;
$this->calculated['x_axis']['step'] = $width / ($numTicks + $extraTick);
$widthPlot = $width - ($this->calculated['x_axis']['step'] * $extraTick);
$this->calculated['x_axis']['step'] = $widthPlot / $numTicks;
//calculate factor for transforming x,y physical coords to logical coords for right hand y_axis.
$y_range = $this->calculated['y_axis_right']['max'] - $this->calculated['y_axis_right']['min'];
$y_range = ($y_range ? $y_range : 1);
$this->calculated['y_axis_right']['factor'] = $height / $y_range;
//calculate factor for transforming x,y physical coords to logical coords for left hand axis.
$yRange = $this->calculated['y_axis_left']['max'] - $this->calculated['y_axis_left']['min'];
$yRange = ($yRange ? $yRange : 1);
$this->calculated['y_axis_left']['factor'] = $height / $yRange;
if ($this->parameter['x_axis_gridlines'] != 'auto') {
$xRange = $this->calculated['x_axis']['max'] - $this->calculated['x_axis']['min'];
$xRange = ($xRange ? $xRange : 1);
$this->calculated['x_axis']['factor'] = $widthPlot / $xRange;
}
//expand_pre($this->calculated['boundary_box']);
// cycle thru all data sets...
$this->calculated['num_bars'] = 0;
foreach ($this->y_order as $order => $set) {
// determine how many bars there are
if (isset($this->y_format[$set]['bar']) && ($this->y_format[$set]['bar'] != 'none')) {
$this->calculated['bar_offset_index'][$set] = $this->calculated['num_bars']; // index to relate bar with data set.
$this->calculated['num_bars']++;
}
// calculate y coords for plotting data
foreach ($this->x_data as $index => $x) {
$this->calculated['y_plot'][$set][$index] = $this->y_data[$set][$index];
if ((string)$this->y_data[$set][$index] != 'none') {
if (isset($this->y_format[$set]['y_axis']) && $this->y_format[$set]['y_axis'] == 'right') {
$this->calculated['y_plot'][$set][$index] =
round(($this->y_data[$set][$index] - $this->calculated['y_axis_right']['min'])
* $this->calculated['y_axis_right']['factor']);
} else {
//print "$set $index<br />";
$this->calculated['y_plot'][$set][$index] =
round(($this->y_data[$set][$index] - $this->calculated['y_axis_left']['min'])
* $this->calculated['y_axis_left']['factor']);
}
}
}
}
//print "factor ".$this->calculated['x_axis']['factor']."<br />";
//expand_pre($this->calculated['x_plot']);
// calculate bar parameters if bars are to be drawn.
if ($this->calculated['num_bars']) {
$xStep = $this->calculated['x_axis']['step'];
$totalWidth = $this->calculated['x_axis']['step'] - $this->parameter['bar_spacing'];
$barWidth = $totalWidth / $this->calculated['num_bars'];
$barX = ($barWidth - $totalWidth) / 2; // starting x offset
for ($i=0; $i < $this->calculated['num_bars']; $i++) {
$this->calculated['bar_offset_x'][$i] = $barX;
$barX += $barWidth; // add width of bar to x offset.
}
$this->calculated['bar_width'] = $barWidth;
}
}
function init_x_ticks() {
// get coords for x axis ticks and data plots
//$xGrid = $this->parameter['x_grid'];
$xStep = $this->calculated['x_axis']['step'];
$ticksOffset = $this->parameter['x_offset']; // where to start drawing ticks relative to y axis.
$gridLeft = $this->calculated['boundary_box']['left'] + ($xStep * $ticksOffset); // grid x start
$tickX = $gridLeft; // tick x coord
foreach ($this->calculated['x_axis']['text'] as $set => $value) {
//print "index: $set<br />";
// x tick value
$this->calculated['x_axis']['tick_x'][$set] = $tickX;
// if num ticks is auto then x plot value is same as x tick
if ($this->parameter['x_axis_gridlines'] == 'auto') $this->calculated['x_plot'][$set] = round($tickX);
//print $this->calculated['x_plot'][$set].'<br />';
$tickX += $xStep;
}
//print "xStep: $xStep <br />";
// if numeric x axis then calculate x coords for each data point. this is seperate from x ticks.
$gridX = $gridLeft;
if (empty($this->calculated['x_axis']['factor'])) {
$this->calculated['x_axis']['factor'] = 0;
}
if (empty($this->calculated['x_axis']['min'])) {
$this->calculated['x_axis']['min'] = 0;
}
$factor = $this->calculated['x_axis']['factor'];
$min = $this->calculated['x_axis']['min'];
if ($this->parameter['x_axis_gridlines'] != 'auto') {
foreach ($this->x_data as $index => $x) {
//print "index: $index, x: $x<br />";
$offset = $x - $this->calculated['x_axis']['min'];
//$gridX = ($offset * $this->calculated['x_axis']['factor']);
//print "offset: $offset <br />";
//$this->calculated['x_plot'][$set] = $gridLeft + ($offset * $this->calculated['x_axis']['factor']);
$this->calculated['x_plot'][$index] = $gridLeft + ($x - $min) * $factor;
//print $this->calculated['x_plot'][$set].'<br />';
}
}
//expand_pre($this->calculated['boundary_box']);
//print "factor ".$this->calculated['x_axis']['factor']."<br />";
//expand_pre($this->calculated['x_plot']);
}
function init_y_ticks() {
// get coords for y axis ticks
$yStep = $this->calculated['y_axis']['step'];
$gridBottom = $this->calculated['boundary_box']['bottom'];
$tickY = $gridBottom; // tick y coord
for ($i = 0; $i < $this->parameter['y_axis_gridlines']; $i++) {
$this->calculated['y_axis']['tick_y'][$i] = $tickY;
$tickY -= $yStep;
}
}
function init_labels() {
if ($this->parameter['title']) {
$size = $this->get_boundaryBox(
array('points' => $this->parameter['title_size'],
'angle' => 0,
'font' => $this->parameter['title_font'],
'text' => $this->parameter['title']));
$this->calculated['title']['boundary_box'] = $size;
$this->calculated['title']['text'] = $this->parameter['title'];
$this->calculated['title']['font'] = $this->parameter['title_font'];
$this->calculated['title']['points'] = $this->parameter['title_size'];
$this->calculated['title']['colour'] = $this->parameter['title_colour'];
$this->calculated['title']['angle'] = 0;
$this->calculated['boundary_box']['top'] += $size['height'] + $this->parameter['outer_padding'];
//$this->calculated['boundary_box']['top'] += $size['height'];
} else $this->calculated['title']['boundary_box'] = $this->get_null_size();
if ($this->parameter['y_label_left']) {
$this->calculated['y_label_left']['text'] = $this->parameter['y_label_left'];
$this->calculated['y_label_left']['angle'] = $this->parameter['y_label_angle'];
$this->calculated['y_label_left']['font'] = $this->parameter['label_font'];
$this->calculated['y_label_left']['points'] = $this->parameter['label_size'];
$this->calculated['y_label_left']['colour'] = $this->parameter['label_colour'];
$size = $this->get_boundaryBox($this->calculated['y_label_left']);
$this->calculated['y_label_left']['boundary_box'] = $size;
//$this->calculated['boundary_box']['left'] += $size['width'] + $this->parameter['inner_padding'];
$this->calculated['boundary_box']['left'] += $size['width'];
} else $this->calculated['y_label_left']['boundary_box'] = $this->get_null_size();
if ($this->parameter['y_label_right']) {
$this->calculated['y_label_right']['text'] = $this->parameter['y_label_right'];
$this->calculated['y_label_right']['angle'] = $this->parameter['y_label_angle'];
$this->calculated['y_label_right']['font'] = $this->parameter['label_font'];
$this->calculated['y_label_right']['points'] = $this->parameter['label_size'];
$this->calculated['y_label_right']['colour'] = $this->parameter['label_colour'];
$size = $this->get_boundaryBox($this->calculated['y_label_right']);
$this->calculated['y_label_right']['boundary_box'] = $size;
//$this->calculated['boundary_box']['right'] -= $size['width'] + $this->parameter['inner_padding'];
$this->calculated['boundary_box']['right'] -= $size['width'];
} else $this->calculated['y_label_right']['boundary_box'] = $this->get_null_size();
if ($this->parameter['x_label']) {
$this->calculated['x_label']['text'] = $this->parameter['x_label'];
$this->calculated['x_label']['angle'] = $this->parameter['x_label_angle'];
$this->calculated['x_label']['font'] = $this->parameter['label_font'];
$this->calculated['x_label']['points'] = $this->parameter['label_size'];
$this->calculated['x_label']['colour'] = $this->parameter['label_colour'];
$size = $this->get_boundaryBox($this->calculated['x_label']);
$this->calculated['x_label']['boundary_box'] = $size;
//$this->calculated['boundary_box']['bottom'] -= $size['height'] + $this->parameter['inner_padding'];
$this->calculated['boundary_box']['bottom'] -= $size['height'];
} else $this->calculated['x_label']['boundary_box'] = $this->get_null_size();
}
function init_legend() {
$this->calculated['legend'] = array(); // array to hold calculated values for legend.
//$this->calculated['legend']['boundary_box_max'] = array('height' => 0, 'width' => 0);
$this->calculated['legend']['boundary_box_max'] = $this->get_null_size();
if ($this->parameter['legend'] == 'none') return;
$position = $this->parameter['legend'];
$numSets = 0; // number of data sets with legends.
$sumTextHeight = 0; // total of height of all legend text items.
$width = 0;
$height = 0;
foreach ($this->y_order as $set) {
$text = isset($this->y_format[$set]['legend']) ? $this->y_format[$set]['legend'] : 'none';
$size = $this->get_boundaryBox(
array('points' => $this->parameter['legend_size'],
'angle' => 0,
'font' => $this->parameter['legend_font'],
'text' => $text));
$this->calculated['legend']['boundary_box'][$set] = $size;
$this->calculated['legend']['text'][$set] = $text;
//$this->calculated['legend']['font'][$set] = $this->parameter['legend_font'];
//$this->calculated['legend']['points'][$set] = $this->parameter['legend_size'];
//$this->calculated['legend']['angle'][$set] = 0;
if ($text && $text!='none') {
$numSets++;
$sumTextHeight += $size['height'];
}
if ($size['width'] > $this->calculated['legend']['boundary_box_max']['width'])
$this->calculated['legend']['boundary_box_max'] = $size;
}
$offset = $this->parameter['legend_offset']; // offset in pixels of legend box from graph border.
$padding = $this->parameter['legend_padding']; // padding in pixels around legend text.
$textWidth = $this->calculated['legend']['boundary_box_max']['width']; // width of largest legend item.
$textHeight = $this->calculated['legend']['boundary_box_max']['height']; // use height as size to use for colour square in legend.
$width = $padding * 2 + $textWidth + $textHeight * 2; // left and right padding + maximum text width + space for square
$height = ($padding + $textHeight) * $numSets + $padding; // top and bottom padding + padding between text + text.
$this->calculated['legend']['boundary_box_all'] = array('width' => $width,
'height' => $height,
'offset' => $offset,
'reference' => $position);
switch ($position) { // move in right or bottom if legend is outside data plotting area.
case 'outside-top' :
$this->calculated['boundary_box']['right'] -= $offset + $width; // move in right hand side
break;
case 'outside-bottom' :
$this->calculated['boundary_box']['right'] -= $offset + $width; // move in right hand side
break;
case 'outside-left' :
$this->calculated['boundary_box']['bottom'] -= $offset + $height; // move in right hand side
break;
case 'outside-right' :
$this->calculated['boundary_box']['bottom'] -= $offset + $height; // move in right hand side
break;
}
}
function init_y_axis() {
$this->calculated['y_axis_left'] = array(); // array to hold calculated values for y_axis on left.
$this->calculated['y_axis_left']['boundary_box_max'] = $this->get_null_size();
$this->calculated['y_axis_right'] = array(); // array to hold calculated values for y_axis on right.
$this->calculated['y_axis_right']['boundary_box_max'] = $this->get_null_size();
$axis_font = $this->parameter['axis_font'];
$axis_size = $this->parameter['axis_size'];
$axis_colour = $this->parameter['axis_colour'];
$axis_angle = $this->parameter['y_axis_angle'];
$y_tick_labels = $this->y_tick_labels;
$this->calculated['y_axis_left']['has_data'] = FALSE;
$this->calculated['y_axis_right']['has_data'] = FALSE;
// find min and max y values.
$minLeft = $this->parameter['y_min_left'];
$maxLeft = $this->parameter['y_max_left'];
$minRight = $this->parameter['y_min_right'];
$maxRight = $this->parameter['y_max_right'];
$dataLeft = array();
$dataRight = array();
foreach ($this->y_order as $order => $set) {
if (isset($this->y_format[$set]['y_axis']) && $this->y_format[$set]['y_axis'] == 'right') {
$this->calculated['y_axis_right']['has_data'] = TRUE;
$dataRight = array_merge($dataRight, $this->y_data[$set]);