Hi I am using phpGraphLib to generate charts but I have a problem.
I want to add 2 arrays as data and I want them to be displayed one data column after another data column. So I changed the constant MULTI_OFFSET_TWO=24 to MULTI_OFFSET_TWO=100, and in generateBars() function I made this modification: $xStart += 2*$this->bar_width + $this->space_width; (multiplied by 2). This is all ok but x bar does not change its length, it stays the same, so some of the columns are displayed out of the X bar. What else do I need to modify to reach what I want?
This is the source code of generateBars function:
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);
//set different offsets based on number of data sets
$dataset_offset = 0;
switch ($this->data_set_count) {
case 2:
$dataset_offset = $this->bar_width * (self::MULTI_OFFSET_TWO / 100);
break;
case 3:
$dataset_offset = $this->bar_width * (self::MULTI_OFFSET_THREE / 100);
break;
case 4:
$dataset_offset = $this->bar_width * (self::MULTI_OFFSET_FOUR / 100);
break;
case 5:
$dataset_offset = $this->bar_width * (self::MULTI_OFFSET_FIVE / 100);
break;
}
foreach ($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;
$hideBarOutline = true;
} elseif ($item >= $this->data_range_max) {
//display, but cut off display above range max
$y1 = $this->x_axis_y1 - ($this->actual_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) * self::DATA_VALUE_TEXT_WIDTH) / 2);
//value to be graphed is equal/over 0
if ($item >= 0) {
$dataY = $y1 - self::DATA_VALUE_PADDING - self::DATA_VALUE_TEXT_HEIGHT;
} else {
//check for item values below user spec'd range
if ($this->bool_user_data_range && $item <= $this->data_range_min) {
$dataY = $y1 - self::DATA_VALUE_PADDING - self::DATA_VALUE_TEXT_HEIGHT;
} else {
$dataY = $y1 + self::DATA_VALUE_PADDING;
}
}
//add currency sign, formatting etc
if ($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 * self::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 - self::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) * self::TEXT_WIDTH) + self::AXIS_VALUE_PADDING);
}
$textHorizPos = round($xStart + ($this->bar_width / 2) - (self::TEXT_HEIGHT / 2));
//skip and dispplay every x intervals
if ($this->x_axis_value_interval) {
if ($this->x_axis_value_interval_counter < $this->x_axis_value_interval) {
$this->x_axis_value_interval_counter++;
} else {
imagestringup($this->image, 2, $textHorizPos, $textVertPos, $key, $this->x_axis_text_color);
$this->x_axis_value_interval_counter = 0;
}
}
else {
imagestringup($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 - self::TEXT_HEIGHT - self::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 + (self::TEXT_HEIGHT * 2 / 3) - self::AXIS_VALUE_PADDING);
}
//horizontal data keys
$textHorizPos = round($xStart + ($this->bar_width / 2) - ((strlen($key) * self::TEXT_WIDTH) / 2));
//skip and dispplay every x intervals
if ($this->x_axis_value_interval) {
if ($this->x_axis_value_interval_counter < $this->x_axis_value_interval) {
$this->x_axis_value_interval_counter++;
} else {
imagestring($this->image, 2, $textHorizPos, $textVertPos, $key, $this->x_axis_text_color);
$this->x_axis_value_interval_counter = 0;
}
} else {
imagestring($this->image, 2, $textHorizPos, $textVertPos, $key, $this->x_axis_text_color);
}
}
}
}
$xStart += $this->bar_width + $this->space_width;//modification: multiplied by 2
}
}
}
