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<?php
///////////////////////////////////////////////////////////
//PHPGraphLib - PHP Graphing Library v2.31
//Author: Elliott Brueggeman
//PHP v4.04 + compatible
//Please visit www.ebrueggeman.com for usage policy
//and full documentation + examples
///////////////////////////////////////////////////////////
class PHPGraphLib {
//---------------user changeable defaults----------------/
var $height = 300;
var $width = 400;
var $data_max_allowable = 9999999999999999;
var $data_min_allowable = -9999999999999999;
var $data_set_count = 0;
//set to actual font heights and widths used
var $title_char_width = 6;
var $title_char_height = 12;
var $text_width = 6;
var $text_height = 12;
var $data_value_text_width = 6;
var $data_value_text_height = 12;
//padding between axis and value displayed
var $axis_value_padding = 5;
//space b/t top of bar or center of point and data value
var $data_value_padding = 5;
//default margin % of width / height
var $x_axis_default_percent = 12;
var $y_axis_default_percent = 8;
//data point diameter in px
var $data_point_width = 6;
//user changeable default booleans (show element by default?)
var $bool_bar_outline = true;
var $bool_x_axis = true;
var $bool_y_axis = true;
var $bool_x_axis_values = true;
var $bool_y_axis_values = true;
var $bool_grid = true;
var $bool_line = false;
var $bool_data_values = false;
var $bool_x_axis_values_vert = true;
var $bool_data_points = false;
var $bool_title_left = false;
var $bool_title_right = false;
var $bool_title_center = true;
//----------internal variables (do not change)------------/
var $image;
var $output_file;
var $error;
var $bool_x_axis_setup = false;
var $bool_y_axis_setup = false;
var $bool_data = false;
var $bool_bars_generate = true;
var $bool_bars = true;
var $bool_background = false;
var $bool_title = false;
var $bool_all_negative = false;
var $bool_all_positive = false;
var $bool_gradient = false;
var $bool_user_data_range = false;
var $all_zero_data = false;
var $bool_gradient_colors_found; //init as array
//color vars
var $background_color;
var $grid_color;
var $bar_color;
var $outline_color;
var $x_axis_text_color;
var $y_axis_text_color;
var $title_color;
var $x_axis_color;
var $y_axis_color;
var $data_point_color;
var $data_value_color;
var $line_color;
var $line_color_default;
var $goal_line_color;
var $goal_line_color_custom;
//gradient colors stored as arrays, not allocated color
var $gradient_color_1;
var $gradient_color_2;
var $gradient_color_array;
var $gradient_max = 200;
var $gradient_handicap;
//data vars
var $data_array;
var $data_count;
var $data_min;
var $data_max;
var $true_displayed_max_value;
var $true_displayed_min_value;
var $data_currency;
var $data_format_array;
var $data_additional_length = 0;
var $data_format_generic;
//bar vars / scale
var $bar_spaces;
var $bar_width;
var $space_width;
var $unit_scale;
var $goal_line_array;
var $horiz_grid_lines;
var $vert_grid_lines;
var $horiz_grid_values;
var $vert_grid_values;
//text / font
var $title_x;
var $title_y;
//axis points
var $x_axis_x1;
var $x_axis_y1;
var $x_axis_x2;
var $x_axis_y2;
var $y_axis_x1;
var $y_axis_y1;
var $y_axis_x2;
var $y_axis_y2;
var $x_axis_margin; //aka bottom margin
var $y_axis_margin; //aka left margin
var $data_range_max;
var $data_range_min;
var $top_margin = 0;
var $right_margin = 0;
var $range_divisor_factor = 25; //controls auto-adjusting grid interval
var $data_point_array;
//multiple dataset variables
var $bool_multi_offset = true;
var $multi_offset_two = 24; //percent of bar width
var $multi_offset_three = 15; //percent of bar width
var $multi_offset_four = 10; //percent of bar width
var $multi_offset_five = 9; //percent of bar width
var $multi_gradient_colors_1;
var $multi_gradient_colors_2;
var $multi_bar_colors;
var $color_darken_factor = 30;//percent decrease
//legend variables
var $bool_legend = false;
var $legend_text_width = 6; //in px...
var $legend_max_chars = 15;
var $legend_total_chars;
var $legend_text_height = 12;
var $legend_padding=4; //padding inside legend box
var $legend_width;
var $legend_height;
var $legend_x;
var $legend_y;
var $legend_text_color;
var $legend_outline_color;
var $legend_swatch_outline_color;
var $legend_color;
var $legend_titles = array();
function PHPGraphLib($width = '', $height = '', $output_file = NULL) {
if (!empty($width) && !empty($height)) {
$this->width = $width;
$this->height = $height;
}
$this->output_file = $output_file;
$this->initialize();
$this->allocateColors(); //sets default colors
}
function initialize() {
//header must be sent before any html or blank space output
if (!$this->output_file){ header("Content-type: image/png"); }
$this->image = @imagecreate($this->width, $this->height)
or die("Cannot Initialize new GD image stream - Check your PHP setup");
$this->data_point_array = array();
$this->goal_line_array = array();
$this->multi_bar_colors = array();
$this->multi_gradient_colors_1 = array();
$this->multi_gradient_colors_2 = array();
//these values are now arrays
$this->gradient_handicap = array();
$this->bool_gradient_colors_found = array();
$this->legend_total_chars = array();
$this->line_color = array();
$this->data_format_array = array();
$this->horiz_grid_lines = array();
$this->vert_grid_lines = array();
$this->horiz_grid_values = array();
$this->vert_grid_values = array();
}
function createGraph() {
//main class method - called last
//setup axis if not already setup by user
if ($this->bool_data){
if (!$this->bool_x_axis_setup){ $this->setupXAxis(); }
if (!$this->bool_y_axis_setup){ $this->setupYAxis(); }
//calculations
$this->calcTopMargin();
$this->calcRightMargin();
$this->calcCoords();
$this->setupData();
//start creating actual image elements
if ($this->bool_background){ $this->generateBackgound(); }
//always gen grid values, even if not displayed
$this->generateGrid();
if ($this->bool_bars_generate){ $this->generateBars(); }
if ($this->bool_data_points){ $this->generateDataPoints(); }
if ($this->bool_legend){ $this->generateLegend(); }
if ($this->bool_title){ $this->generateTitle(); }
if ($this->bool_x_axis){ $this->generateXAxis(); }
if ($this->bool_y_axis){ $this->generateYAxis(); }
}
else {
$this->error[] = "No valid data added to graph. Add data with the addData() function.";
}
//display errors
$this->displayErrors();
//output to browser
if ($this->output_file) {
imagepng($this->image, $this->output_file);
}
else {
imagepng($this->image);
}
imagedestroy($this->image);
}
function setupData() {
$this->bar_spaces = ($this->data_count * 2) + 1;
$unit_width = ($this->width - $this->y_axis_margin - $this->right_margin) / (($this->data_count * 2) + $this->data_count);
if ($unit_width < 1) {
//error units too small, too many data points or not large enough graph
$this->bool_bars_generate = false;
$this->error[] = "Graph too small or too many data points.";
}
else {
//default space between bars is 1/2 the width of the bar
//find bar and space widths. bar = 2 units, space = 1 unit
$this->bar_width= 2 * $unit_width;
$this->space_width = $unit_width;
//now calculate height (scale) units
$availVertSpace = $this->height - $this->x_axis_margin - $this->top_margin;
if ($availVertSpace<1) {
$this->bool_bars_generate=false;
$this->error[] = "Graph height not tall enough.";
//error scale units too small, x axis margin too big or graph height not tall enough
}
else {
if ($this->bool_user_data_range) {
//if all zero data, set fake max and min to range boundaries
if ($this->all_zero_data) {
if ($this->data_range_min > $this->data_min) { $this->data_min = $this->data_range_min; }
if ($this->data_range_max < $this->data_max) { $this->data_max = $this->data_range_max; }
}
$graphTopScale = $this->data_range_max;
$graphBottomScale = $this->data_range_min;
$graphScaleRange = $graphTopScale - $graphBottomScale;
$this->unit_scale = $availVertSpace / $graphScaleRange;
$this->data_max = $this->data_range_max;
$this->data_min = $this->data_range_min;
if ($this->data_min < 0) {
$this->x_axis_y1 -= round($this->unit_scale * abs($this->data_min));
$this->x_axis_y2 -= round($this->unit_scale * abs($this->data_min));
}
//all data identical
if ($graphScaleRange == 0) {
$graphScaleRange = 100;
}
}
else {
//start at y value 0 or data min, whichever is less
$graphBottomScale = ($this->data_min<0) ? $this->data_min : 0;
$graphTopScale = ($this->data_max<0) ? 0 : $this->data_max ;
$graphScaleRange = $graphTopScale - $graphBottomScale;
//all data identical
if ($graphScaleRange == 0) {
$graphScaleRange = 100;
}
$this->unit_scale = $availVertSpace / $graphScaleRange;
//now adjust x axis in y value if negative values
if ($this->data_min < 0) {
$this->x_axis_y1 -= round($this->unit_scale * abs($this->data_min));
$this->x_axis_y2 -= round($this->unit_scale * abs($this->data_min));
}
}
$this->bool_bars_generate = true;
}
}
}
//always port changes to generatebars() to extensions
function generateBars() {
$this->finalizeColors();
$barCount = 0;
$adjustment = 0;
if ($this->bool_user_data_range && $this->data_min >= 0) {
$adjustment = $this->data_min * $this->unit_scale;
}
//reverse array to order data sets in order of priority
$this->data_array = array_reverse($this->data_array);
$dataset_offset=0;
if ($this->bool_multi_offset) {
//set different offsets based on number of data sets
switch ($this->data_set_count) {
case 2: $dataset_offset = $this->bar_width * ($this->multi_offset_two / 100); break;
case 3: $dataset_offset = $this->bar_width * ($this->multi_offset_three / 100); break;
case 4: $dataset_offset = $this->bar_width * ($this->multi_offset_four / 100); break;
case 5: $dataset_offset = $this->bar_width * ($this->multi_offset_five / 100); break;
}
}
foreach ($this->data_array as $data_set_num => $data_set) {
$lineX2 = NULL;
$xStart = $this->y_axis_x1 + ($this->space_width / 2);
foreach ($data_set as $key => $item) {
$hideBarOutline = false;
$x1=round($xStart + ($dataset_offset * $data_set_num));
$x2=round(($xStart + $this->bar_width) + ($dataset_offset * $data_set_num));
$y1=round($this->x_axis_y1 - ($item * $this->unit_scale) + $adjustment);
$y2=round($this->x_axis_y1);
//if we are using a user specified data range, need to limit what's displayed
if ($this->bool_user_data_range) {
if ($item <= $this->data_range_min) {
//don't display, we are out of our allowed display range!
$y1 = $y2;
$hideBarOutline = true;
}
else if ($item >= $this->data_range_max) {
//display, but cut off display above range max
$y1 = $this->x_axis_y1 - ($this->true_displayed_max_value * $this->unit_scale) + $adjustment;
}
}
//draw bar
if ($this->bool_bars) {
if ($this->bool_gradient) {
//draw gradient if desired
$this->drawGradientBar($x1, $y1, $x2, $y2, $this->multi_gradient_colors_1[$data_set_num], $this->multi_gradient_colors_2[$data_set_num], $data_set_num);
}
else {
imagefilledrectangle($this->image, $x1, $y1,$x2, $y2, $this->multi_bar_colors[$data_set_num]);
}
//draw bar outline
if ($this->bool_bar_outline && !$hideBarOutline) {
imagerectangle($this->image, $x1, $y2, $x2, $y1, $this->outline_color);
}
}
// draw line
if ($this->bool_line) {
$lineX1 = $x1 + ($this->bar_width / 2); //MIDPOINT OF BARS, IF SHOWN
$lineY1 = $y1;
if (isset($lineX2)) {
imageline($this->image, $lineX2, $lineY2, $lineX1, $lineY1, $this->line_color[$data_set_num]);
$lineX2 = $lineX1;
$lineY2 = $lineY1;
}
else {
$lineX2 = $lineX1;
$lineY2 = $lineY1;
}
}
// display data points
if ($this->bool_data_points) {
//dont draw datapoints here or will overlap poorly with line
//instead collect coordinates
$pointX = $x1 + ($this->bar_width / 2); //MIDPOINT OF BARS, IF SHOWN
$this->data_point_array[] = array($pointX, $y1);
}
// display data values
if ($this->bool_data_values) {
$dataX = ($x1 + ($this->bar_width / 2)) - ((strlen($item) * $this->data_value_text_width) / 2);
//value to be graphed is equal/over 0
if ($item >= 0) {
$dataY = $y1 - $this->data_value_padding - $this->data_value_text_height;
}
else {
//check for item values below user spec'd range
if ($this->bool_user_data_range && $item <= $this->data_range_min) {
$dataY = $y1 - $this->data_value_padding - $this->data_value_text_height;
}
else {
$dataY = $y1 + $this->data_value_padding;
}
}
//add currency sign, formatting etc
if ($this->data_format_array) {
$item = $this->applyDataFormats($item);
}
if ($this->data_currency) {
$item = $this->applyDataCurrency($item);
}
//recenter data position if necessary
$dataX -= ($this->data_additional_length * $this->data_value_text_width) / 2;
imagestring($this->image, 2, $dataX, $dataY, $item, $this->data_value_color);
}
//write x axis value
if ($this->bool_x_axis_values) {
if ($data_set_num == $this->data_set_count - 1) {
if ($this->bool_x_axis_values_vert) {
if ($this->bool_all_negative) {
//we must put values above 0 line
$textVertPos = round($this->y_axis_y2 - $this->axis_value_padding);
}
else {
//mix of both pos and neg numbers
//write value y axis bottom value (will be under bottom of grid even if x axis is floating due to
$textVertPos = round($this->y_axis_y1 + (strlen($key) * $this->text_width) + $this->axis_value_padding);
}
$textHorizPos = round($xStart + ($this->bar_width / 2) - ($this->text_height / 2));
imagestringup($this->image, 2, $textHorizPos, $textVertPos, $key, $this->x_axis_text_color);
}
else {
if ($this->bool_all_negative) {
//we must put values above 0 line
$textVertPos = round($this->y_axis_y2 - $this->text_height - $this->axis_value_padding);
}
else {
//mix of both pos and neg numbers
//write value y axis bottom value (will be under bottom of grid even if x axis is floating due to
$textVertPos = round($this->y_axis_y1 + ($this->text_height * 2 / 3) - $this->axis_value_padding);
}
//horizontal data keys
$textHorizPos = round($xStart + ($this->bar_width / 2) - ((strlen($key) * $this->text_width) / 2));
imagestring($this->image, 2, $textHorizPos, $textVertPos, $key, $this->x_axis_text_color);
}
}
}
$xStart += $this->bar_width + $this->space_width;
}
}
}
function finalizeColors() {
if ($this->bool_gradient) {
$num_set=count($this->multi_gradient_colors_1);
//loop through set colors and add backing colors if necessary
if ($num_set != $this->data_set_count) {
$color_darken_decimal = (100 - $this->color_darken_factor) / 100;
while ($num_set < $this->data_set_count) {
$color_ref_1 = $this->multi_gradient_colors_1[$num_set - 1];
$color_ref_2 = $this->multi_gradient_colors_2[$num_set - 1];
$this->multi_gradient_colors_1[] = array(
round($color_ref_1[0] * $color_darken_decimal),
round($color_ref_1[1] * $color_darken_decimal),
round($color_ref_1[2] * $color_darken_decimal));
$this->multi_gradient_colors_2[]=array(
round($color_ref_2[0] * $color_darken_decimal),
round($color_ref_2[1] * $color_darken_decimal),
round($color_ref_2[2] * $color_darken_decimal));
$num_set++;
}
}
while (count($this->multi_gradient_colors_1) > $this->data_set_count) {
$temp = array_pop($this->multi_gradient_colors_1);
}
while (count($this->multi_gradient_colors_2) > $this->data_set_count) {
$temp = array_pop($this->multi_gradient_colors_2);
}
$this->multi_gradient_colors_1 = array_reverse($this->multi_gradient_colors_1);
$this->multi_gradient_colors_2 = array_reverse($this->multi_gradient_colors_2);
}
else if (!$this->bool_gradient) {
$num_set = count($this->multi_bar_colors);
if ($num_set == 0) {
$this->multi_bar_colors[0] = $this->bar_color;
$num_set = 1;
}
//loop through set colors and add backing colors if necessary
while ($num_set < $this->data_set_count) {
$color_ref = $this->multi_bar_colors[$num_set - 1];
$color_parts = imagecolorsforindex($this->image, $color_ref);
$color_darken_decimal = (100 - $this->color_darken_factor) / 100;
$this->multi_bar_colors[$num_set] = imagecolorallocate($this->image,
round($color_parts['red'] * $color_darken_decimal),
round($color_parts['green'] * $color_darken_decimal),
round($color_parts['blue'] * $color_darken_decimal));
$num_set++;
}
while (count($this->multi_bar_colors) > $this->data_set_count) {
$temp = array_pop($this->multi_bar_colors);
}
$this->multi_bar_colors = array_reverse($this->multi_bar_colors);
}
if ($this->bool_line) {
if (!$this->bool_bars) {
$num_set = count($this->line_color);
if ($num_set == 0) {
$this->line_color[0] = $this->line_color_default;
$num_set = 1;
}
//only darken each data set's lines when no bars present
while ($num_set < $this->data_set_count) {
$color_ref = $this->line_color[$num_set - 1];
$color_parts = imagecolorsforindex($this->image, $color_ref);
$color_darken_decimal = (100 - $this->color_darken_factor) / 100;
$this->line_color[$num_set] = imagecolorallocate($this->image,
round($color_parts['red'] * $color_darken_decimal),
round($color_parts['green'] * $color_darken_decimal),
round($color_parts['blue'] * $color_darken_decimal));
$num_set++;
}
}
else {
$num_set = count($this->line_color);
while ($num_set < $this->data_set_count) {
$this->line_color[$num_set] = $this->line_color_default;
$num_set++;
}
}
while (count($this->line_color) > $this->data_set_count) {
$temp = array_pop($this->line_color);
}
$this->line_color = array_reverse($this->line_color);
}
}
function drawGradientBar($x1, $y1, $x2, $y2, $colorArr1, $colorArr2, $data_set_num) {
if (!isset($this->bool_gradient_colors_found[$data_set_num]) || $this->bool_gradient_colors_found[$data_set_num] == false) {
$this->gradient_handicap[$data_set_num] = 0;
$numLines = abs($x1 - $x2) + 1;
while ($numLines * $this->data_set_count > $this->gradient_max) {
//we have more lines than allowable colors
//use handicap to record this
$numLines /= 2;
$this->gradient_handicap[$data_set_num]++;
}
$color1R = $colorArr1[0];
$color1G = $colorArr1[1];
$color1B = $colorArr1[2];
$color2R = $colorArr2[0];
$color2G = $colorArr2[1];
$color2B = $colorArr2[2];
$rScale = ($color1R-$color2R) / $numLines;
$gScale = ($color1G-$color2G) / $numLines;
$bScale = ($color1B-$color2B) / $numLines;
$this->allocateGradientColors($color1R, $color1G, $color1B, $rScale, $gScale, $bScale, $numLines, $data_set_num);
}
$numLines = abs($x1 - $x2) + 1;
if ($this->gradient_handicap[$data_set_num] > 0) {
//if handicap is used, it will allow us to move through the array more slowly, depending on the set value
$interval = $this->gradient_handicap[$data_set_num];
for($i = 0; $i < $numLines; $i++) {
$adjusted_index = ceil($i / pow(2, $interval)) - 1;
if ($adjusted_index < 0) {
$adjusted_index = 0;
}
imageline($this->image, $x1+$i, $y1, $x1 + $i, $y2, $this->gradient_color_array[$data_set_num][$adjusted_index]);
}
}
else {
//normal gradients with colors < $this->gradient_max
for ($i = 0; $i < $numLines; $i++) {
imageline($this->image, $x1+$i, $y1, $x1+$i, $y2, $this->gradient_color_array[$data_set_num][$i]);
}
}
}
function generateGrid() {
if ($this->bool_user_data_range && $this->data_min >= 0) {
$adjustment = $this->data_min * $this->unit_scale;
}
else {
$adjustment = 0;
}
//calculate both values
$this->calculateGridHoriz($adjustment);
$this->calculateGridVert();
//output values - separation from calc is b/c of an extension related need
$this->generateGrids();
$this->generateGoalLines($adjustment);
}
function calculateGridHoriz($adjustment = 0) {
//determine horizontal grid lines
$horizGridArray = array();
if ($this->bool_user_data_range) {
$min = $this->data_min;
}
else {
$min = 0;
}
$horizGridArray[] = $min;
//use our function to determine ideal y axis scale interval
$intervalFromZero = $this->determineAxisMarkerScale($this->data_max, $this->data_min);
//if we have positive values, add grid values to array
//until we reach the max needed (we will go 1 over)
$cur = $min;
while ($cur < $this->data_max) {
$cur += $intervalFromZero;
$horizGridArray[] = $cur;
}
//if we have negative values, add grid values to array
//until we reach the min needed (we will go 1 over)
$cur = $min;
while ($cur > $this->data_min) {
$cur -= $intervalFromZero;
$horizGridArray[] = $cur;
}
//sort needed b/c we will use last value later (max)
sort($horizGridArray);
$this->true_displayed_max_value = $horizGridArray[count($horizGridArray) - 1];
$this->true_displayed_min_value = $horizGridArray[0];
//loop through each horizontal line
foreach ($horizGridArray as $value) {
$yValue = round($this->x_axis_y1 - ($value * $this->unit_scale) + $adjustment);
if ($this->bool_grid) {
//imageline($this->image, $this->y_axis_x1, $yValue, $this->x_axis_x2 , $yValue, $this->grid_color);
$this->horiz_grid_lines[] = array('x1' => $this->y_axis_x1, 'y1' => $yValue,
'x2' => $this->x_axis_x2, 'y2' => $yValue, 'color' => $this->grid_color);
}
//display value on y axis if desired using calc'd grid values
if ($this->bool_y_axis_values) {
$adjustedYValue = $yValue - ($this->text_height / 2);
$adjustedXValue = $this->y_axis_x1 - ((strlen($value) + $this->data_additional_length) * $this->text_width) - $this->axis_value_padding;
//add currency sign, formatting etc
if ($this->data_format_array) {
$value = $this->applyDataFormats($value);
}
if ($this->data_currency) {
$value = $this->applyDataCurrency($value);
}
//imagestring($this->image, 2, $adjustedXValue, $adjustedYValue, $value, $this->y_axis_text_color);
$this->horiz_grid_values[] = array('size' => 2, 'x' => $adjustedXValue, 'y' => $adjustedYValue,
'value' => $value, 'color' => $this->y_axis_text_color);
}
}
if (!$this->bool_all_positive && !$this->bool_user_data_range) {
//reset with better value based on grid min value calculations, not data min
$this->y_axis_y1 = $this->x_axis_y1 - ($horizGridArray[0] * $this->unit_scale);
}
//reset with better value based on grid value calculations, not data min
$this->y_axis_y2 = $yValue;
}
function calculateGridVert() {
//determine vertical grid lines
$vertGridArray = array();
$vertGrids = $this->data_count + 1;
$interval = $this->bar_width + $this->space_width;
//assemble vert gridline array
for ($i = 1; $i < $vertGrids; $i++) {
$vertGridArray[] = $this->y_axis_x1 + ($interval * $i);
}
//loop through each vertical line
if ($this->bool_grid) {
$xValue = $this->y_axis_y1;
foreach ($vertGridArray as $value) {
//imageline($this->image, $value, $this->y_axis_y2, $value, $xValue , $this->grid_color);
$this->vert_grid_lines[] = array('x1' => $value, 'y1' => $this->y_axis_y2,
'x2' => $value, 'y2' => $xValue, 'color' => $this->grid_color);
}
}
}
function imagelinedashed(&$image_handle, $x_axis_x1, $yLocation, $x_axis_x2 , $yLocation, $color) {
$step = 3;
for ($i = $x_axis_x1; $i < $x_axis_x2 -1; $i += ($step*2)) {
imageline($this->image, $i, $yLocation, $i + $step - 1, $yLocation, $color);
}
}
function generateGrids() {
//loop through and display values
foreach ($this->horiz_grid_lines as $line) {
imageline($this->image, $line['x1'], $line['y1'], $line['x2'], $line['y2'] , $line['color']);
}
foreach ($this->vert_grid_lines as $line) {
imageline($this->image, $line['x1'], $line['y1'], $line['x2'], $line['y2'] , $line['color']);
}
foreach ($this->horiz_grid_values as $value) {
imagestring($this->image, $value['size'], $value['x'], $value['y'], $value['value'], $value['color']);
}
//not implemented in the base library, but used in extensions
foreach ($this->vert_grid_values as $value) {
imagestring($this->image, $value['size'], $value['x'], $value['y'], $value['value'], $value['color']);
}
}
function generateGoalLines($adjustment = 0) {
//draw goal lines if present (after grid) - doesn't get executed if array empty
foreach ($this->goal_line_array as $goal_line_data) {
$yLocation = $goal_line_data['yValue'];
$style = $goal_line_data['style'];
$color = $goal_line_data['color'] ? $goal_line_data['color'] : $this->goal_line_color;
$yLocation = round(($this->x_axis_y1 - ($yLocation * $this->unit_scale) + $adjustment));
if ($style == 'dashed') {
$this->imagelinedashed($this->image, $this->x_axis_x1, $yLocation, $this->x_axis_x2 , $yLocation, $color);
}
else {
//a solid line is the default if a style condition is not matched
imageline($this->image, $this->x_axis_x1, $yLocation, $this->x_axis_x2 , $yLocation, $color);
}
}
}
function generateDataPoints() {
foreach ($this->data_point_array as $pointArray) {
imagefilledellipse($this->image, $pointArray[0], $pointArray[1], $this->data_point_width, $this->data_point_width, $this->data_point_color);
}
}
function generateXAxis() {
imageline($this->image, $this->x_axis_x1, $this->x_axis_y1, $this->x_axis_x2, $this->x_axis_y2, $this->x_axis_color);
}
function generateYAxis() {
imageline($this->image, $this->y_axis_x1, $this->y_axis_y1, $this->y_axis_x2, $this->y_axis_y2, $this->y_axis_color);
}
function generateBackgound() {
imagefilledrectangle($this->image, 0, 0, $this->width, $this->height, $this->background_color);
}
function generateTitle() {
//spacing may have changed since earlier
//use top margin or grid top y, whichever less
$highestElement = ($this->top_margin < $this->y_axis_y2) ? $this->top_margin : $this->y_axis_y2;
$textVertPos = ($highestElement / 2) - ($this->title_char_height / 2); //centered
$titleLength = strlen($this->title_text);
if ($this->bool_title_center) {
$this->title_x = ($this->width / 2) - (($titleLength * $this->title_char_width) / 2);
$this->title_y = $textVertPos;
}
else if ($this->bool_title_left) {
$this->title_x = $this->y_axis_x1;
$this->title_y = $textVertPos;
}
else if ($this->bool_title_right) {
$this->title_x = $this->x_axis_x2 - ($titleLength * $this->title_char_width);
$this->title_y = $textVertPos;
}
imagestring($this->image, 2, $this->title_x , $this->title_y , $this->title_text, $this->title_color);
}
function calcTopMargin() {
if ($this->bool_title) {
//include space for title, approx margin + 3*title height
$this->top_margin = ($this->height * ($this->x_axis_default_percent / 100)) + $this->title_char_height;
}
else {
//just use default spacing
$this->top_margin = $this->height * ($this->x_axis_default_percent / 100);
}
}
function calcRightMargin() {
//just use default spacing
$this->right_margin = $this->width * ($this->y_axis_default_percent / 100);
}
function calcCoords() {
//calculate axis points, also used for other calculations
$this->x_axis_x1 = $this->y_axis_margin;
$this->x_axis_y1 = $this->height - $this->x_axis_margin;
$this->x_axis_x2 = $this->width - $this->right_margin;
$this->x_axis_y2 = $this->height - $this->x_axis_margin;
$this->y_axis_x1 = $this->y_axis_margin;
$this->y_axis_y1 = $this->height - $this->x_axis_margin;
$this->y_axis_x2 = $this->y_axis_margin;
$this->y_axis_y2 = $this->top_margin;
}
function determineAxisMarkerScale($max, $min, $axis = 'y') {
switch ($axis) {
case 'y' : $space = $this->height; break;
case 'x' : $space = $this->width; break;
}
//for calclation, take range or max-0
if ($this->bool_user_data_range) {
$range = abs($max - $min);
}
else {
$range = (abs($max-$min) > abs($max - 0)) ? abs($max - $min) : abs($max - 0);
}
//handle all zero data
if ($range == 0) {
$range = 10;
}
//multiply up to over 100, to better figure interval
$count = 0;
while (abs($range) < 100) {
$range *= 10;
$count++;
}
//divide into intervals based on height / preset constant - after rounding will be approx
$divisor = round($space / $this->range_divisor_factor);
$divided = round($range / $divisor);
$result = $this->roundUpOneExtraDigit($divided);
//if rounded up w/ extra digit is more than 200% of divided value,
//round up to next sig number with same num of digits
if ($result / $divided >= 2) {
$result = $this->roundUpSameDigits($divided);
}
//divide back down, if needed
for ($i = 0; $i < $count; $i++) {
$result /= 10;
}
return $result;
}
function roundUpSameDigits($num) {
$len = strlen($num);
if (round($num, -1 * ($len - 1)) == $num) {
//we already have a sig number
return $num;
}
else {
$firstDig = substr($num, 0,1);
$secondDig = substr($num, 1,1);
$rest = substr($num, 2);
$secondDig = 5;
$altered = $firstDig.$secondDig.$rest;
//after reassembly, round up to next sig number, same # of digits
return round((int)$altered, -1 * ($len - 1));
}
}
function roundUpOneExtraDigit($num) {
$len = strlen($num);
$firstDig = substr($num, 0, 1);
$rest = substr($num, 1);
$firstDig = 5;
$altered = $firstDig . $rest;
//after reassembly, round up to next sig number, one extra # of digits
return round((int)$altered, -1 * ($len));
}
function displayErrors() {
if (count($this->error) > 0) {
$lineHeight = 12;
$errorColor = imagecolorallocate($this->image, 0, 0, 0);
$errorBackColor = imagecolorallocate($this->image, 255, 204, 0);
imagefilledrectangle($this->image, 0, 0, $this->width - 1, 2 * $lineHeight, $errorBackColor);
imagestring($this->image, 3, 2, 0, "!!----- PHPGraphLib Error -----!!", $errorColor);
foreach($this->error as $key => $errorText) {
imagefilledrectangle($this->image, 0, ($key * $lineHeight) + $lineHeight, $this->width - 1, ($key * $lineHeight) + 2 * $lineHeight, $errorBackColor);
imagestring($this->image, 2, 2, ($key * $lineHeight) + $lineHeight, "[". ($key + 1) . "] ". $errorText, $errorColor);
}
$errorOutlineColor = imagecolorallocate($this->image, 255, 0, 0);
imagerectangle($this->image, 0, 0, $this->width-1,($key * $lineHeight) + 2 * $lineHeight, $errorOutlineColor);
}
}
function addData($data, $data2 = '', $data3 = '', $data4 = '', $data5 = '') {
if (is_array($data)){ $this->data_array[]=$data; }
if (is_array($data2)){ $this->data_array[]=$data2; }
if (is_array($data3)){ $this->data_array[]=$data3; }
if (is_array($data4)){ $this->data_array[]=$data4; }
if (is_array($data5)){ $this->data_array[]=$data5; }
//assess data
$min = $this->data_max_allowable;
$max = $this->data_min_allowable;
$this->data_count = 0;
//get rid of bad data, find max, min
foreach ($this->data_array as $data_set_num => $data_set) {
foreach ($data_set as $key => $item) {
if (!is_numeric($item)) {
unset($this->data_array[$data_set_num][$key]);
}
else {
if ($item < $min){ $min = $item; }
if ($item > $max){ $max = $item; }
}
}
//find the count of the dataset with the most data points
$count = count($this->data_array[$data_set_num]);
$count > $this->data_count ? ($this->data_count = $count) : NULL;
}
//number of valid data sets
$this->data_set_count = count($this->data_array);
if ($this->data_set_count == 0) {
$this->error[] = "No valid datasets added in adddata() function.";
}
else {
$this->calcMinMax($min, $max);
}
}
function calcMinMax($min, $max) {
$this->bool_data = true;
//min and max for all datasets
$this->data_min = $min;
$this->data_max = $max;
if ($this->data_min >= 0) {
$this->bool_all_positive = true;
}
else if ($this->data_max<=0) {
$this->bool_all_negative=true;
}
//setup fake max and min for all zero data
if ($this->data_min >= 0 && $this->data_max == 0 ) {
$this->data_min = 0;
$this->data_max = 10;
$this->all_zero_data = true;
}
}
function setupXAxis($percent = '', $color = '') {
if ($percent === false) {
$this->bool_x_axis = false;
}
else {
$this->bool_x_axis = true;
}
$this->bool_x_axis_setup = true;
if (!empty($color) && $arr = $this->returnColorArray($color)) {
$this->x_axis_color = imagecolorallocate($this->image, $arr[0], $arr[1], $arr[2]);
}
if (is_numeric($percent) && $percent>0) {
$percent = $percent / 100;
$this->x_axis_margin = round($this->height * $percent);
}
else {
$percent = $this->x_axis_default_percent / 100;
$this->x_axis_margin = round($this->height * $percent);
}
}
function setupYAxis($percent = '', $color = '') {
if ($percent === false) {
$this->bool_y_axis = false;
}
else {
$this->bool_y_axis = true;
}
$this->bool_y_axis_setup = true;
if (!empty($color) && $arr = $this->returnColorArray($color)) {
$this->y_axis_color = imagecolorallocate($this->image, $arr[0], $arr[1], $arr[2]);
}
if (is_numeric($percent) && $percent>0) {
$this->y_axis_margin = round($this->width * ($percent / 100));
}
else {
$percent = $this->y_axis_default_percent / 100;
$this->y_axis_margin = round($this->width * $percent);
}
}
function setRange($min, $max) {
//because of deprecated use of this function as($max, $min)
if ($min > $max) {
$this->data_range_max = $min;
$this->data_range_min = $max;
}
else {
$this->data_range_max = $max;
$this->data_range_min = $min;
}
$this->bool_user_data_range = true;
}
function setTitle($title) {
if (!empty($title)) {
$this->title_text = $title;
$this->bool_title = true;
}
else{ $this->error[] = "String arg for setTitle() not specified properly."; }
}
function setTitleLocation($location) {
$this->bool_title_left = false;
$this->bool_title_right = false;
$this->bool_title_center = false;
switch (strtolower($location)) {
case 'left': $this->bool_title_left = true; break;
case 'right': $this->bool_title_right = true; break;
case 'center': $this->bool_title_center = true; break;
default: $this->error[] = "String arg for setTitleLocation() not specified properly.";
}
}
function setBars($bool) {
if (is_bool($bool)) { $this->bool_bars = $bool;}
else { $this->error[] = "Boolean arg for setBars() not specified properly."; }
}
function setGrid($bool) {
if (is_bool($bool)) { $this->bool_grid = $bool;}
else { $this->error[] = "Boolean arg for setGrid() not specified properly."; }
}
function setXValues($bool) {
if (is_bool($bool)) { $this->bool_x_axis_values = $bool; }
else { $this->error[] = "Boolean arg for setXValues() not specified properly."; }
}
function setYValues($bool) {
if (is_bool($bool)) { $this->bool_y_axis_values = $bool; }
else { $this->error[] = "Boolean arg for setYValues() not specified properly."; }
}
function setXValuesHorizontal($bool) {
if (is_bool($bool)) {
($bool) ? $this->bool_x_axis_values_vert = false : $this->bool_x_axis_values_vert = true;
}
else{ $this->error[] = "Boolean arg for setXValuesHorizontal() not specified properly."; }
}
function setXValuesVertical($bool) {
if (is_bool($bool)) { $this->bool_x_axis_values_vert = $bool; }
else { $this->error[] = "Boolean arg for setXValuesVertical() not specified properly."; }
}
function setBarOutline($bool) {
if (is_bool($bool)) { $this->bool_bar_outline = $bool; }
else { $this->error[] = "Boolean arg for setBarOutline() not specified properly."; }
}
function setDataPoints($bool) {
if (is_bool($bool)) { $this->bool_data_points = $bool; }
else { $this->error[] = "Boolean arg for setDataPoints() not specified properly."; }
}
function setDataPointSize($size) {
if (is_numeric($size)) { $this->data_point_width = $size; }
else { $this->error[] = "Data point size in setDataPointSize() not specified properly."; }
}
function setDataValues($bool) {
if (is_bool($bool)) { $this->bool_data_values = $bool; }
else{ $this->error[] = "Boolean arg for setDataValues() not specified properly."; }
}
function setDataCurrency($currency_type = 'dollar') {
switch (strtolower($currency_type)) {
case 'dollar': $this->data_currency = '$'; break;
case 'yen': $this->data_currency = '¥'; break;
case 'pound': $this->data_currency = '£'; break;
case 'lira': $this->data_currency = '£'; break;
/* Euro doesn't display properly...
case 'euro': $this->data_currency = '€'; break; */
/* Franc doesn't display properly
case 'franc': $this->data_currency = '?'; break; */
default: $this->data_currency = $currency_type; break;
}
$this->data_additional_length += strlen($this->data_currency);
}
function applyDataCurrency($input) {
return $this->data_currency . $input;
}
function setDataFormat($format) {
//setup structure for future additional data formats - specify callback functions
switch ($format) {
case 'comma':
$this->data_format_array[] = 'formatDataAsComma';
$this->data_additional_length += floor(strlen($this->data_max) / 3);
break;
case 'percent':
$this->data_format_array[] = 'formatDataAsPercent';
$this->data_additional_length++;
break;
case 'degrees':
$this->data_format_array[] = 'formatDataAsDegrees';
$this->data_additional_length++;
break;
default:
$this->data_format_array[] = 'formatDataAsGeneric';
$this->data_format_generic = $format;
$this->data_additional_length += strlen($format);
break;
}
}
function applyDataFormats($input) {
//comma formatting must be done first
if ($pos = array_search('formatDataAsComma', $this->data_format_array)) {
unset($this->data_format_array[$pos]);
array_unshift($this->data_format_array, 'formatDataAsComma');
}
//loop through each formatting function
foreach ($this->data_format_array as $format_type_callback) {
eval('$input=$this->' . $format_type_callback . '($input);');
}
return $input;
}
function formatDataAsComma($input) {
//check for negative sign
$sign_part = '';
if (substr($input, 0, 1) == '-') {
$input = substr($input, 1);
$sign_part = '-';
}
//handle decimals
$decimal_part = '';
if (($pos = strpos($input, '.')) !== false) {
$decimal_part = substr($input, $pos);
$input = substr($input, 0, $pos);
}
//turn data into format 12,234...
$parts = '';
while (strlen($input)>3) {
$parts = ',' . substr($input, -3) . $parts;
$input = substr($input, 0, strlen($input) - 3);
}
$input = $sign_part . $currency_part . $input . $parts . $decimal_part;
return $input;
}
function formatDataAsPercent($input) {
return $input . '%';
}
function formatDataAsDegrees($input) {
return $input . '°';
}
function formatDataAsGeneric($input) {
return $input . $this->data_format_generic;
}
function setLine($bool) {
if (is_bool($bool)) { $this->bool_line = $bool; }
else { $this->error[] = "Boolean arg for setLine() not specified properly."; }
}
function setGoalLine($yValue, $color = NULL, $style = 'solid') {
if (is_numeric($yValue)) {
if ($color) {
$this->setGenericColor($color, '$this->goal_line_custom_color', "Goal line color not specified properly.");
$color = $this->goal_line_custom_color;
}
$this->goal_line_array[] = array('yValue' => $yValue, 'color' => $color, 'style' => $style);
}
else {
$this->error[] = "Goal line Y axis value not specified properly.";
}
}
function allocateColors() {
$this->background_color = imagecolorallocate($this->image, 255, 255, 255);
$this->grid_color = imagecolorallocate($this->image, 220, 220, 220);
$this->bar_color = imagecolorallocate($this->image, 200, 200, 200);
$this->line_color_default = imagecolorallocate($this->image, 100, 100, 100);
$this->x_axis_text_color = $this->line_color_default;
$this->y_axis_text_color = $this->line_color_default;
$this->data_value_color = $this->line_color_default;
$this->title_color = imagecolorallocate($this->image, 0, 0, 0);
$this->outline_color = $this->title_color;
$this->data_point_color = $this->title_color;
$this->x_axis_color = $this->title_color;
$this->y_axis_color = $this->title_color;
$this->goal_line_color = $this->title_color;
//New Legend Colors
$this->legend_outline_color = $this->grid_color;
$this->legend_color = $this->background_color;
$this->legend_text_color = $this->line_color_default;
$this->legend_swatch_outline_color = $this->line_color_default;
}
function returnColorArray($color) {
//check to see if numeric color passed through in form '128,128,128'
if (strpos($color,',') !== false) {
return explode(',', $color);
}
//check to see if in hex format
else if (substr($color, 0, 1) == '#') {
if (strlen($color) == 7) {
$hex1 = hexdec(substr($color, 1, 2));
$hex2 = hexdec(substr($color, 3, 2));
$hex3 = hexdec(substr($color, 5, 2));
return array($hex1, $hex2, $hex3);
}
else if (strlen($color) == 4) {
$hex1 = hexdec(substr($color, 1, 1) . substr($color, 1, 1));
$hex2 = hexdec(substr($color, 2, 1) . substr($color, 2, 1));
$hex3 = hexdec(substr($color, 3, 1) . substr($color, 3, 1));
return array($hex1, $hex2, $hex3);
}
}
switch (strtolower($color)) {
//NAMED COLORS BASED ON W3C's RECOMMENDED HTML COLORS
case 'black': return array(0,0,0); break;
case 'silver': return array(192,192,192); break;
case 'gray': return array(128,128,128); break;
case 'white': return array(255,255,255); break;
case 'maroon': return array(128,0,0); break;
case 'red': return array(255,0,0); break;
case 'purple': return array(128,0,128); break;
case 'fuscia': return array(255,0,255); break;
case 'green': return array(0,128,0); break;
case 'lime': return array(0,255,0); break;
case 'olive': return array(128,128,0); break;
case 'yellow': return array(255,255,0); break;
case 'navy': return array(0,0,128); break;
case 'blue': return array(0,0,255); break;
case 'teal': return array(0,128,128); break;
case 'aqua': return array(0,255,255); break;
}
$this->error[] = "Color name \"$color\" not recogized.";
return false;
}
function allocateGradientColors($color1R, $color1G, $color1B, $rScale, $gScale, $bScale, $num, $data_set_num) {
//caluclate the colors used in our gradient and store them in array
$this->gradient_color_array[$data_set_num] = array();
for ($i = 0; $i <= $num + 1; $i++) {
$this->gradient_color_array[$data_set_num][$i] = imagecolorallocate($this->image, $color1R - ($rScale * $i), $color1G - ($gScale * $i), $color1B - ($bScale * $i));
}
$this->bool_gradient_colors_found[$data_set_num] = true;
}
function setGenericColor($inputColor, $var, $errorMsg) {
//can be used for most color setting options
if (!empty($inputColor) && ($arr = $this->returnColorArray($inputColor))) {
eval($var . ' = imagecolorallocate($this->image, $arr[0], $arr[1], $arr[2]);');
return true;
}
else {
$this->error[] = $errorMsg;
return false;
}
}
function setBackgroundColor($color) {
if ($this->setGenericColor($color, '$this->background_color', "Background color not specified properly.")) {
$this->bool_background = true;
}
}
function setTitleColor($color) {
$this->setGenericColor($color, '$this->title_color', "Title color not specified properly.");
}
function setTextColor($color) {
$this->setGenericColor($color, '$this->x_axis_text_color', "X axis text color not specified properly.");
$this->setGenericColor($color, '$this->y_axis_text_color', "Y axis Text color not specified properly.");
}
function setXAxisTextColor($color) {
$this->setGenericColor($color, '$this->x_axis_text_color', "X axis text color not specified properly.");
}
function setYAxisTextColor($color) {
$this->setGenericColor($color, '$this->y_axis_text_color', "Y axis Text color not specified properly.");
}
function setBarColor($color, $color2 = '', $color3 = '', $color4 = '', $color5 = '') {
$this->setGenericColor($color, '$this->multi_bar_colors[]', "Bar color not specified properly.");
if (!empty($color2)) {
$this->setGenericColor($color2, '$this->multi_bar_colors[]', "Bar color 2 not specified properly.");
}
if (!empty($color3)) {
$this->setGenericColor($color3, '$this->multi_bar_colors[]', "Bar color 3 not specified properly.");
}
if (!empty($color4)) {
$this->setGenericColor($color4, '$this->multi_bar_colors[]', "Bar color 4 not specified properly.");
}
if (!empty($color5)) {
$this->setGenericColor($color5, '$this->multi_bar_colors[]', "Bar color 5 not specified properly.");
}
}
function setGridColor($color) {
$this->setGenericColor($color, '$this->grid_color', "Grid color not specified properly.");
}
function setBarOutlineColor($color) {
$this->setGenericColor($color, '$this->outline_color', "Bar outline color not specified properly.");
}
function setDataPointColor($color) {
$this->setGenericColor($color, '$this->data_point_color', "Data point color not specified properly.");
}
function setDataValueColor($color) {
$this->setGenericColor($color, '$this->data_value_color', "Data value color not specified properly.");
}
function setLineColor($color, $color2 = '', $color3 = '', $color4 = '', $color5 = '') {
$this->setGenericColor($color, '$this->line_color[]', "Line color not specified properly.");
if (!empty($color2)) {
$this->setGenericColor($color2, '$this->line_color[]', "Line color 2 not specified properly.");
}
if (!empty($color3)) {
$this->setGenericColor($color3, '$this->line_color[]', "Line color 3 not specified properly.");
}
if (!empty($color4)) {
$this->setGenericColor($color4, '$this->line_color[]', "Line color 4 not specified properly.");
}
if (!empty($color5)) {
$this->setGenericColor($color5, '$this->line_color[]', "Line color 5 not specified properly.");
}
}
/* @deprecated - setGoalLineColor() replaced with 2nd parameter of setGoalLine() */
function setGoalLineColor($color) {
$this->setGenericColor($color, '$this->goal_line_color', "Goal line color not specified properly.");
}
function setGradient($color1, $color2, $color3='', $color4='', $color5='', $color6='', $color7='', $color8='', $color9='', $color10='') {
if (!empty($color1) && !empty($color2) && ($arr1 = $this->returnColorArray($color1)) && ($arr2 = $this->returnColorArray($color2))) {
$this->bool_gradient=true;
$this->multi_gradient_colors_1[] = $arr1;
$this->multi_gradient_colors_2[] = $arr2;
}
else {
$this->error[] = "Gradient color(s) not specified properly.";
}
//Optional gradients
if (!empty($color3) && !empty($color4) && ($arr1=$this->returnColorArray($color3)) && ($arr2 = $this->returnColorArray($color4))) {
$this->bool_gradient=true;
$this->multi_gradient_colors_1[]=$arr1;
$this->multi_gradient_colors_2[]=$arr2;
}
if (!empty($color5) && !empty($color6) && ($arr1 = $this->returnColorArray($color5)) && ($arr2 = $this->returnColorArray($color6))) {
$this->bool_gradient = true;
$this->multi_gradient_colors_1[] = $arr1;
$this->multi_gradient_colors_2[] = $arr2;
}
if (!empty($color7) && !empty($color8) && ($arr1 = $this->returnColorArray($color7)) && ($arr2 = $this->returnColorArray($color8))) {
$this->bool_gradient = true;
$this->multi_gradient_colors_1[] = $arr1;
$this->multi_gradient_colors_2[] = $arr2;
}
if (!empty($color9) && !empty($color10) && ($arr1 = $this->returnColorArray($color9)) && ($arr2 = $this->returnColorArray($color10))) {
$this->bool_gradient = true;
$this->multi_gradient_colors_1[] = $arr1;
$this->multi_gradient_colors_2[] = $arr2;
}
}
//Legend Related Functions
function setLegend($bool) {
if (is_bool($bool)) { $this->bool_legend = $bool;}
else { $this->error[] = "Boolean arg for setLegend() not specified properly."; }
}
function setLegendColor($color) {
$this->setGenericColor($color, '$this->legend_color', "Legend color not specified properly.");
}
function setLegendTextColor($color) {
$this->setGenericColor($color, '$this->legend_text_color', "Legend text color not specified properly.");
}
function setLegendOutlineColor($color) {
$this->setGenericColor($color, '$this->legend_outline_color', "Legend outline color not specified properly.");
}
function setSwatchOutlineColor($color) {
$this->setGenericColor($color, '$this->legend_swatch_outline_color', "Swatch outline color not specified properly.");
}
function setLegendTitle($title, $title2 = '', $title3 = '', $title4 = '', $title5 = '') {
if (!empty($title)) {
$len = strlen($title);
if ($len > $this->legend_max_chars){
$title = substr($title, 0, $this->legend_max_chars);
$this->legend_total_chars[] = $this->legend_max_chars;
}
else {$this->legend_total_chars[] = $len;}
$this->legend_titles[] = $title;
}
else {$this->error[] = "String arg 1 for setLegendTitles() not specified properly."; }
if (!empty($title2)) {
$len = strlen($title2);
if ($len > $this->legend_max_chars) {
$title2 = substr($title2, 0, $this->legend_max_chars);
$this->legend_total_chars[] = $this->legend_max_chars;
}
else {$this->legend_total_chars[] = $len;}
$this->legend_titles[] = $title2;
}
if (!empty($title3)) {
$len = strlen($title3);
if ($len > $this->legend_max_chars){
$title3 = substr($title3, 0, $this->legend_max_chars);
$this->legend_total_chars[] = $this->legend_max_chars;
}
else {$this->legend_total_chars[] = $len;}
$this->legend_titles[] = $title3;
}
if (!empty($title4)) {
$len = strlen($title4);
if ($len > $this->legend_max_chars){
$title4 = substr($title4, 0, $this->legend_max_chars);
$this->legend_total_chars[] = $this->legend_max_chars;
}
else {$this->legend_total_chars[] = $len;}
$this->legend_titles[] = $title4;
}
if (!empty($title5)) {
$len = strlen($title5);
if ($len > $this->legend_max_chars){
$title5 = substr($title5, 0, $this->legend_max_chars);
$this->legend_total_chars[] = $this->legend_max_chars;
}
else {$this->legend_total_chars[] = $len;}
$this->legend_titles[] = $title5;
}
}
function generateLegend() {
$swatchToTextOffset = ($this->legend_text_height - 6) / 2;
$swatchSize = $this->legend_text_height - (2 * $swatchToTextOffset);
//calc height / width based on # of data sets
$this->legend_height = $this->legend_text_height + (2 * $this->legend_padding);
$totalChars = 0;
for ($i = 0; $i < $this->data_set_count; $i++) {
//could have more titles than data sets - check for this
if (isset($this->legend_total_chars[$i])){ $totalChars += $this->legend_total_chars[$i]; }
}
$this->legend_width = $totalChars * $this->legend_text_width + ($this->legend_padding * 2.2) +
($this->data_set_count * ($swatchSize + ($this->legend_padding * 2)));
$this->legend_x = $this->x_axis_x2 - $this->legend_width;
$highestElement = ($this->top_margin < $this->y_axis_y2) ? $this->top_margin : $this->y_axis_y2;
$this->legend_y = ($highestElement / 2) - ($this->legend_height / 2); //centered
//background
imagefilledrectangle($this->image, $this->legend_x, $this->legend_y, $this->legend_x+$this->legend_width,
$this->legend_y + $this->legend_height, $this->legend_color);
//border
imagerectangle($this->image, $this->legend_x, $this->legend_y, $this->legend_x+$this->legend_width,
$this->legend_y+$this->legend_height, $this->legend_outline_color);
$length_covered = 0;
for($i = 0; $i < $this->data_set_count; $i++) {
$data_label = '';
if (isset($this->legend_titles[$i])) {
$data_label = $this->legend_titles[$i];
}
$yValue = $this->legend_y + $this->legend_padding;
$xValue = $this->legend_x + $this->legend_padding + ($length_covered * $this->legend_text_width) + ($i * 4 * $this->legend_padding);
$length_covered += strlen($data_label);
//draw color boxes
if ($this->bool_bars) {
if ($this->bool_gradient) {
$color = $this->gradient_color_array[$this->data_set_count - $i - 1][0];
}
else{
$color = $this->multi_bar_colors[$this->data_set_count - $i - 1];
}
}
else if ($this->bool_line&&!$this->bool_bars)
{
$color = $this->line_color[$this->data_set_count - $i - 1];
}
imagefilledrectangle($this->image, $xValue, $yValue+$swatchToTextOffset, $xValue + $swatchSize, $yValue + $swatchToTextOffset + $swatchSize, $color);
imagerectangle($this->image, $xValue, $yValue + $swatchToTextOffset, $xValue + $swatchSize, $yValue + $swatchToTextOffset + $swatchSize, $this->legend_swatch_outline_color);
imagestring($this->image, 2, $xValue + (2 * $this->legend_padding + 2), $yValue, $data_label, $this->legend_text_color);
}
}
}
?>
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