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DisplayAxis.php
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DisplayAxis.php
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<?php
/**
* Copyright (C) 2018-2023 Graham Breach
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* For more information, please contact <[email protected]>
*/
namespace Goat1000\SVGGraph;
/**
* Converts an abstract axis into SVG markup
*/
class DisplayAxis {
protected $graph;
protected $axis;
protected $axis_no;
protected $orientation;
protected $type;
protected $main;
protected $styles;
protected $show_axis;
protected $show_divisions;
protected $show_subdivisions;
protected $show_text;
protected $show_label;
protected $label = '';
protected $block_label;
protected $boxed_text;
protected $minimum_subdivision;
protected $minimum_units;
protected $subdivisions_fixed;
protected $offset = [0, 0];
/**
* $orientation = 'h' or 'v'
* $type = 'x' or 'y'
* $main = TRUE for the main axis
* $label_centre = TRUE for graphs with labels between divisions
*/
public function __construct(&$graph, &$axis, $axis_no, $orientation, $type,
$main, $label_centre)
{
$this->axis_no = $axis_no;
$this->orientation = $orientation;
$this->type = $type;
$this->main = $main;
$this->block_label = ($type == 'x' && ($label_centre ||
$graph->getOption('force_block_label_x')));
$this->boxed_text = false;
$styles = [];
// set up options, styles
$o = $orientation;
$this->show_axis = false;
$this->show_text = false;
if($graph->getOption('show_axes')) {
$this->show_axis = $graph->getOption(['show_axis_' . $o, $axis_no]);
$this->show_text = $graph->getOption('show_axis_text_' . $o);
}
// offset caused by padding between axis and grid
if($o == 'v') {
switch($axis_no) {
case 0: $this->offset[0] = -$graph->getOption('axis_pad_left');
break;
case 1: $this->offset[0] = $graph->getOption('axis_pad_right');
break;
}
} else {
switch($axis_no) {
case 0: $this->offset[1] = $graph->getOption('axis_pad_bottom');
break;
case 1: $this->offset[1] = -$graph->getOption('axis_pad_top');
break;
}
}
// lambda to make retrieving options simpler
$get_axis_option = function($option) use ($graph, $o, $axis_no) {
return $graph->getOption([$option . '_' . $o, $axis_no], $option);
};
// gridgraph moves label_[xy] into label_[hv]
$o_labels = $graph->getOption('label_' . $o);
if(is_array($o_labels)) {
// use array entry if one exists for this axis
if(isset($o_labels[$axis_no]))
$this->label = $o_labels[$axis_no];
} elseif($axis_no == 0 && !empty($o_labels)) {
// not an array, so only valid for axis 0
$this->label = $o_labels;
}
$this->show_label = ($this->label != '');
// axis and text both need colour
$styles['colour'] = new Colour($graph, $get_axis_option('axis_colour'));
if($this->show_axis) {
$styles['overlap'] = $graph->getOption('axis_overlap');
$styles['stroke_width'] = $get_axis_option('axis_stroke_width');
if($o == 'v') {
$styles['extend'] = [
$graph->getOption('axis_extend_top', 'axis_pad_top'),
$graph->getOption('axis_extend_bottom', 'axis_pad_bottom'),
];
} else {
$styles['extend'] = [
$graph->getOption('axis_extend_left', 'axis_pad_left'),
$graph->getOption('axis_extend_right', 'axis_pad_right'),
];
}
if($graph->getOption('show_divisions')) {
$this->show_divisions = true;
$styles['d_style'] = $get_axis_option('division_style');
$styles['d_size'] = $get_axis_option('division_size');
$styles['d_colour'] = new Colour($graph, $graph->getOption(
['division_colour_' . $o, $axis_no], 'division_colour',
['@', $styles['colour']]));
if($graph->getOption('show_subdivisions')) {
$this->show_subdivisions = true;
$styles['s_style'] = $get_axis_option('subdivision_style');
$styles['s_size'] = $get_axis_option('subdivision_size');
$styles['s_colour'] = new Colour($graph, $graph->getOption(
['subdivision_colour_' . $o, $axis_no], 'subdivision_colour',
['division_colour_' . $o, $axis_no], 'division_colour',
['@', $styles['colour']]));
$this->minimum_subdivision = $graph->getOption('minimum_subdivision');
$this->minimum_units = ($type == 'x' ? 1 :
$graph->getOption(['minimum_units_y', $axis_no]));
$this->subdivisions_fixed = $graph->getOption(
['subdivision_' . $o, $axis_no]);
}
}
}
if($this->show_text) {
$styles['t_angle'] = $graph->getOption(
['axis_text_angle_' . $o, $axis_no], 0);
if($graph->getOption('limit_text_angle')) {
$angle = $styles['t_angle'] % 360;
if($angle > 180)
$angle = -360 + $angle;
if($angle < -180)
$angle = 360 + $angle;
$angle = min(90, max(-90, $angle));
$styles['t_angle'] = $angle;
}
$styles['t_position'] = $get_axis_option('axis_text_position');
$styles['t_location'] = $get_axis_option('axis_text_location');
$styles['t_font'] = $get_axis_option('axis_font');
$styles['t_font_size'] = Number::units($get_axis_option('axis_font_size'));
$styles['t_font_adjust'] = $get_axis_option('axis_font_adjust');
$styles['t_font_weight'] = $get_axis_option('axis_font_weight');
$styles['t_space'] = $get_axis_option('axis_text_space');
$styles['t_colour'] = new Colour($graph, $graph->getOption(
['axis_text_colour_' . $o, $axis_no], 'axis_text_colour',
['@', $styles['colour']]));
$styles['t_line_spacing'] = Number::units($get_axis_option('axis_text_line_spacing'));
if($styles['t_line_spacing'] === null || $styles['t_line_spacing'] < 1)
$styles['t_line_spacing'] = $styles['t_font_size'];
$styles['t_back_colour'] = null;
$styles['t_align'] = $get_axis_option('axis_text_align');
// fill in background colour array, if required
$back_colour = $get_axis_option('axis_text_back_colour');
if(!empty($back_colour)) {
$styles['t_back_colour'] = [
'stroke-width' => '3px',
'stroke' => new Colour($graph, $back_colour),
'stroke-linejoin' => 'round',
];
}
// text is boxed only if it is outside and block labelling
if($this->block_label && $this->show_divisions &&
($styles['d_style'] == 'box' || $styles['d_style'] == 'extend') &&
$styles['t_position'] != 'inside') {
$this->boxed_text = true;
// text must be attached to axis, not grid
$styles['t_location'] = 'axis';
}
}
if($this->show_label) {
$styles['l_font'] = $graph->getOption(
['label_font_' . $o, $axis_no], 'label_font',
['axis_font_' . $o, $axis_no], 'axis_font');
$styles['l_font_size'] = Number::units($graph->getOption(
['label_font_size_' . $o, $axis_no], 'label_font_size',
['axis_font_size_' . $o, $axis_no], 'axis_font_size'));
$styles['l_font_weight'] = $graph->getOption(
['label_font_weight_' . $o, $axis_no], 'label_font_weight');
$styles['l_colour'] = new Colour($graph, $graph->getOption(
['label_colour_' . $o, $axis_no], 'label_colour',
['axis_text_colour_' . $o, $axis_no], 'axis_text_colour',
['@', $styles['colour']]));
$styles['l_space'] = $graph->getOption('label_space');
$styles['l_pos'] = $get_axis_option('axis_label_position');
$styles['l_line_spacing'] = Number::units($get_axis_option('label_line_spacing'));
if($styles['l_line_spacing'] === null || $styles['l_line_spacing'] < 1)
$styles['l_line_spacing'] = $styles['l_font_size'];
}
$this->styles = $styles;
$this->axis =& $axis;
$this->graph =& $graph;
}
/**
* Returns the array of style information for the axis
*/
public function getStyling()
{
return $this->styles;
}
/**
* Returns the extents of the axis, relative to where it will be drawn from
* returns BoundingBox
*/
public function measure($with_label = true)
{
$bbox = new BoundingBox(0, 0, 0, 0);
if($this->show_axis) {
$dbox = $this->getDivisionsBBox(0);
if($this->orientation == 'h')
$dbox->flipY();
$bbox->growBox($dbox);
}
if($this->show_text) {
$tbox = $this->getTextBBox(0);
$bbox->growBox($tbox);
}
if($with_label && $this->show_label) {
$lpos = $this->getLabelPosition();
$bbox->grow($lpos['x'], $lpos['y'], $lpos['x'] + $lpos['width'],
$lpos['y'] + $lpos['height']);
}
$bbox = $this->addOffset($bbox);
return $bbox;
}
/**
* Adds the padding offset to the bounding box
*/
protected function addOffset(BoundingBox $bbox)
{
if($this->axis_no > 0) {
$bbox->x2 += $this->offset[0];
$bbox->y1 += $this->offset[1];
} else {
$bbox->x1 += $this->offset[0];
$bbox->y2 += $this->offset[1];
}
return $bbox;
}
/**
* Measures the space taken up by axis and divisions
* returns BoundingBox
*/
protected function getDivisionsBBox($level)
{
$bbox = new BoundingBox(0, 0, 0, 0);
if(!$this->show_axis)
return $bbox;
// orientation more important than type
$x = 'x';
$y = 'y';
if($this->orientation == 'h') {
$x = 'y';
$y = 'x';
}
$min = $max = ['x' => 0, 'y' => 0];
$length = $this->axis->getLength();
$d_info = $s_info = ['pos' => 0, 'sz' => 0];
if($this->show_divisions) {
$di = $this->getDivisionPathInfo(false, 100, 100, $level);
if($di !== null)
$d_info = $di;
if($this->show_subdivisions) {
$si = $this->getDivisionPathInfo(true, 100, 100, $level);
if($si !== null)
$s_info = $si;
}
}
$points = $this->axis->getGridPoints(0);
$p1 = end($points);
if($p1->position < 0) {
$min[$y] = $p1->position;
$max[$y] = 0;
} else {
$min[$y] = 0;
$max[$y] = $p1->position;
}
$min[$x] = min($d_info['pos'], $s_info['pos']);
$max[$x] = max($d_info['pos'] + $d_info['sz'], $s_info['pos'] + $s_info['sz']);
$bbox->grow($min['x'], $min['y'], $max['x'], $max['y']);
return $bbox;
}
/**
* Returns the bounding box of the text
*/
protected function getTextBBox($level)
{
$bbox = new BoundingBox(0, 0, 0, 0);
list($x_off, $y_off, $opp) = $this->getTextOffset(0, 0, 0, 0, 0, 0, $level);
$t_offset = ($this->orientation == 'h' ? $x_off : $y_off);
if($this->axis->reversed())
$t_offset = -$t_offset;
$length = $this->axis->getLength();
$points = $this->axis->getGridPoints(0);
$positions = $this->getTextPositions(0, 0, $x_off, $y_off, $points, null);
$count = count($positions);
for($p = 0; $p < $count; ++$p) {
if(!$this->pointTextVisible($points[$p], $length, $t_offset))
continue;
$pos = $positions[$p];
$lbl = $this->measureText($pos['x'], $pos['y'], $points[$p], $opp, $level);
$bbox->grow($lbl['x'], $lbl['y'], $lbl['x'] + $lbl['width'],
$lbl['y'] + $lbl['height']);
}
return $bbox;
}
/**
* Returns the overlap between axis text labels
*/
public function getTextOverlap()
{
// start with obviously good overlap
$overlap = -1000;
$prev_x = -10;
$level = 0;
// no overlap if there is no text
if(!$this->show_text)
return null;
list($x_off, $y_off, $opp) = $this->getTextOffset(0, 0, 0, 0, 0, 0, $level);
$t_offset = ($this->orientation == 'h' ? $x_off : $y_off);
if($this->axis->reversed())
$t_offset = -$t_offset;
$length = $this->axis->getLength();
$points = $this->axis->getGridPoints(0);
$positions = $this->getTextPositions(0, 0, $x_off, $y_off, $points, null);
$count = count($positions);
for($p = 0; $p < $count; ++$p) {
if(!$this->pointTextVisible($points[$p], $length, $t_offset))
continue;
$pos = $positions[$p];
$lbl = $this->measureText($pos['x'], $pos['y'], $points[$p], $opp, $level);
$o = $prev_x - $lbl['x'];
// bail out now if the overlap is positive
if($o > 0)
return $o;
if($o > $overlap)
$overlap = $o;
$prev_x = $lbl['x'] + $lbl['width'];
}
return $overlap;
}
/**
* Returns true if the text exists and its location is within the axis
*/
protected function pointTextVisible($point, $axis_len, $offset)
{
if($point->blank())
return false;
// amount of space to allow for rounding errors
$leeway = 0.5;
$position = abs($point->position) + $offset;
return $position >= -$leeway && $position <= $axis_len + $leeway;
}
/**
* Returns the positions (actually offsets) of all the text blocks
*/
protected function getTextPositions($x, $y, $xoff, $yoff, $points, $anchor)
{
$positions = [];
// vertical axis a bit simpler
if($this->orientation == 'v') {
foreach($points as $k => $p) {
if($this->boxed_text && isset($points[$k + 1])) {
$pnext = $points[$k + 1];
$yoff = ($pnext->position - $p->position) / 2;
}
$positions[] = ['x' => $x + $xoff, 'y' => $y + $yoff];
}
return $positions;
}
foreach($points as $k => $p) {
if($anchor == 'start') {
$xoff = $this->styles['t_space'];
} elseif($anchor == 'end') {
$pnext = $points[$k + 1];
$xoff = $pnext->position - $p->position - $this->styles['t_space'];
} elseif($this->boxed_text && isset($points[$k + 1])) {
$pnext = $points[$k + 1];
$xoff = ($pnext->position - $p->position) / 2;
}
$positions[] = ['x' => $x + $xoff, 'y' => $y + $yoff];
}
return $positions;
}
/**
* Draws the axis at ($x,$y)
* $gx, $gy, $g_width and $g_height are the grid dimensions
*/
public function draw($x, $y, $gx, $gy, $g_width, $g_height)
{
$content = '';
$x += $this->offset[0];
$y += $this->offset[1];
$gx += $this->offset[0];
$gy += $this->offset[1];
if($this->show_axis) {
if($this->show_divisions) {
$content .= $this->drawDivisions($x, $y, $g_width, $g_height);
if($this->show_subdivisions) {
$content .= $this->drawSubDivisions($x, $y, $g_width, $g_height);
}
}
$length = $this->axis->getLength();
$content .= $this->drawAxisLine($x, $y, $length);
}
if($this->show_text || $this->show_label)
$content .= $this->drawText($x, $y, $gx, $gy, $g_width, $g_height);
return $content;
}
/**
* Draws the axis line
*/
public function drawAxisLine($x, $y, $len)
{
$overlap = $this->styles['overlap'];
$length = $len + $overlap * 2;
$line = $this->orientation; // 'h' and 'v' are SVG path lines
$reversed = $this->axis->reversed();
if($this->orientation == 'h') {
$x = $reversed ? $x - $overlap - $len : $x - $overlap;
$x -= $this->styles['extend'][0];
$length += $this->styles['extend'][0] + $this->styles['extend'][1];
} else {
$y = $reversed ? $y - $overlap - $len : $y - $overlap;
$y -= $this->styles['extend'][0];
$length += $this->styles['extend'][0] + $this->styles['extend'][1];
}
$colour = $this->styles['colour'];
if($colour->isGradient()) {
// gradients don't work on stroked horizontal or vertical lines
$sw = $this->styles['stroke_width'];
$attr = [
'fill' => $colour,
'x' => $x,
'y' => $y,
];
if($this->orientation == 'h') {
$attr['y'] -= $sw / 2;
$attr['width'] = $length;
$attr['height'] = $sw;
} else {
$attr['x'] -= $sw / 2;
$attr['width'] = $sw;
$attr['height'] = $length;
}
return $this->graph->element('rect', $attr);
}
$attr = [
'stroke' => $colour,
'd' => new PathData('M', $x, $y, $line, $length),
];
if($this->styles['stroke_width'] != 1)
$attr['stroke-width'] = $this->styles['stroke_width'];
return $this->graph->element('path', $attr);
}
/**
* Draws the axis divisions
*/
public function drawDivisions($x, $y, $g_width, $g_height)
{
$path_info = $this->getDivisionPathInfo(false, $g_width, $g_height, 0);
if($path_info === null)
return '';
$points = $this->axis->getGridPoints(0);
$d = $this->getDivisionPath($x, $y, $points, $path_info, 0);
$attr = [
'd' => $d,
'stroke' => $this->styles['d_colour'],
'fill' => 'none',
];
return $this->graph->element('path', $attr);
}
/**
* Draws the axis subdivisions
*/
public function drawSubDivisions($x, $y, $g_width, $g_height)
{
$path_info = $this->getDivisionPathInfo(true, $g_width, $g_height, 0);
if($path_info === null)
return '';
$points = $this->axis->getGridSubdivisions($this->minimum_subdivision,
$this->minimum_units, 0, $this->subdivisions_fixed);
$d = $this->getDivisionPath($x, $y, $points, $path_info, 0);
$attr = [
'd' => $d,
'stroke' => $this->styles['s_colour'],
'fill' => 'none',
];
return $this->graph->element('path', $attr);
}
/**
* Draws the axis text labels
*/
public function drawText($x, $y, $gx, $gy, $g_width, $g_height)
{
$labels = '';
if($this->show_text) {
list($x_offset, $y_offset, $opposite) = $this->getTextOffset($x, $y,
$gx, $gy, $g_width, $g_height, 0);
$t_offset = ($this->orientation == 'h' ? $x_offset : $y_offset);
if($this->axis->reversed())
$t_offset = -$t_offset;
$length = $this->axis->getLength();
$points = $this->axis->getGridPoints(0);
$anchor = null;
$space = $this->styles['t_space'];
if($this->styles['t_align']) {
$bbox = $this->measure(false);
switch($this->styles['t_align']) {
case 'left':
if($this->orientation == 'v') {
if(!$opposite) {
$anchor = 'start';
$x_offset = $bbox->x1 + $space;
$x_offset -= $this->offset[0];
}
} else {
$anchor = 'start';
$x_offset = $space;
}
break;
case 'right':
if($this->orientation == 'v') {
if($opposite) {
$anchor = 'end';
$x_offset = $bbox->x2 - $space;
}
} else {
$anchor = 'end';
$x_offset = -$space;
}
break;
case 'centre':
if($this->orientation == 'v') {
$x_offset = ($x_offset + ($opposite ? $bbox->x2 : $bbox->x1)) / 2;
$anchor = 'middle';
}
}
}
$positions = $this->getTextPositions($x, $y, $x_offset, $y_offset, $points, $anchor);
$count = count($positions);
for($p = 0; $p < $count; ++$p) {
if(!$this->pointTextVisible($points[$p], $length, $t_offset))
continue;
$pos = $positions[$p];
$labels .= $this->getText($pos['x'], $pos['y'], $points[$p], $opposite, 0, $anchor);
}
if($labels != '') {
$group = [
'font-family' => $this->styles['t_font'],
'font-size' => $this->styles['t_font_size'],
'fill' => $this->styles['t_colour'],
];
$weight = $this->styles['t_font_weight'];
if($weight != 'normal' && $weight !== null)
$group['font-weight'] = $weight;
$labels = $this->graph->element('g', $group, null, $labels);
}
}
if($this->show_label)
$labels .= $this->getLabel($x, $y, $gx, $gy, $g_width, $g_height);
return $labels;
}
/**
* Returns the label
*/
protected function getLabel($x, $y, $gx, $gy, $g_width, $g_height)
{
$pos = $this->getLabelPosition();
$offset = $this->getLabelOffset($x, $y, $gx, $gy, $g_width, $g_height);
$tx = $offset['x'] + $pos['tx'];
$ty = $offset['y'] + $pos['ty'];
$label = [
'text-anchor' => 'middle',
'font-family' => $this->styles['l_font'],
'font-size' => $this->styles['l_font_size'],
'fill' => $this->styles['l_colour'],
'x' => $tx,
'y' => $ty,
];
if(!empty($this->styles['l_font_weight']) &&
$this->styles['l_font_weight'] != 'normal')
$label['font-weight'] = $this->styles['l_font_weight'];
if($pos['angle']) {
$xform = new Transform;
$xform->rotate($pos['angle'], $tx, $ty);
$label['transform'] = $xform;
}
$svg_text = new Text($this->graph, $this->styles['l_font']);
return $svg_text->text($this->label, $this->styles['l_line_spacing'], $label);
}
/**
* Returns the corrected offset for the label
*/
protected function getLabelOffset($x, $y, $gx, $gy, $g_width, $g_height)
{
if($this->orientation == 'h') {
// label at bottom of grid?
if($this->axis_no == 0)
$y = $gy + $g_height;
} else {
// leftmost axis label must be outside grid
if($this->axis_no == 0)
$x = $gx;
}
return ['x' => $x, 'y' => $y];
}
/**
* Returns the dimensions of the label
* x, y, width, height = position and size
* tx, tx = text anchor point
* angle = text angle
*/
protected function getLabelPosition()
{
$bbox = $this->measure(false);
$font_size = $this->styles['l_font_size'];
$line_spacing = $this->styles['l_line_spacing'];
$svg_text = new Text($this->graph, $this->styles['l_font']);
$tsize = $svg_text->measure($this->label, $font_size, 0, $line_spacing);
$baseline = $svg_text->baseline($font_size);
$a_length = $this->axis->getLength();
$space = $this->styles['l_space'];
$align = $this->styles['l_pos'];
if($this->orientation == 'h') {
$width = $tsize[0];
$height = $tsize[1];
if($this->axis_no > 0) {
$y = $bbox->y1 - $space - $height;
} else {
$y = $bbox->y2 + $space;
}
$y -= $this->offset[1]; // handle padding offset
if(is_numeric($align)) {
$tx = $a_length * $align;
} else {
switch($align) {
case 'left' :
$tx = $width / 2;
break;
case 'right':
$tx = $a_length - ($width / 2);
break;
default:
$tx = $a_length / 2;
break;
}
}
$ty = $y + $baseline;
$x = $tx - $width / 2;
$height += $space;
$angle = 0;
} else {
$width = $tsize[1];
$height = $tsize[0];
$reversed = $this->axis->reversed();
if($this->axis_no > 0) {
$x = $bbox->x2 + $space;
$x -= $this->offset[0]; // handle padding offset
$tx = $x + $width - $baseline;
} else {
$x = $bbox->x1 - $space - $width;
$x -= $this->offset[0]; // handle padding offset
$tx = $x + $baseline;
$x -= $space;
}
if(is_numeric($align)) {
$ty = $reversed ? -$a_length * $align : $a_length * $align;
} else {
switch($align) {
case 'top' :
$ty = $reversed ? -$a_length + $height / 2 : $height / 2;
break;
case 'bottom':
$ty = $reversed ? -$height / 2 : $a_length - $height / 2;
break;
default:
$ty = $reversed ? -$a_length / 2 : $a_length / 2;
break;
}
}
$y = $ty - $height / 2;
$width += $space;
$angle = $this->axis_no > 0 ? 90 : 270;
}
return compact('x', 'y', 'width', 'height', 'tx', 'ty', 'angle');
}
/**
* Returns the distance from the axis to draw the text
*/
protected function getTextOffset($ax, $ay, $gx, $gy, $g_width, $g_height,
$level)
{
$d1 = $d2 = 0;
if($this->show_divisions && $level == 0) {
if(!$this->boxed_text) {
$d_info = $this->getDivisionPathInfo(false, 100, 100, 0);
if($d_info !== null) {
$d1 = $d_info['pos'];
$d2 = $d1 + $d_info['sz'];
}
}
if($this->show_subdivisions) {
$s_info = $this->getDivisionPathInfo(true, 100, 100, 0);
if($s_info !== null) {
$s1 = $s_info['pos'];
$s2 = $s1 + $s_info['sz'];
$d1 = min($d1, $s1);
$d2 = max($d2, $s2);
}
}
}
$space = $this->styles['t_space'];
$d1 -= $space;
$d2 += $space;
$opposite = ($this->styles['t_position'] == 'inside');
$reversed = $this->axis->reversed();
$block_offset = $this->axis->unit() * ($reversed ? -0.5 : 0.5);
$grid = ($this->styles['t_location'] == 'grid');
if($this->axis_no > 0)
$opposite = !$opposite;
if($this->orientation == 'h') {
$y = ($opposite ? -$d2 : -$d1);
$x = ($this->block_label ? $block_offset : 0);
if($grid) {
$y += $gy + $g_height - $ay;
if($this->axis_no == 1)
$y -= $g_height;
}
} else {
$x = ($opposite ? $d2 : $d1);
$y = ($this->block_label ? $block_offset : 0);
if($grid && $this->axis_no < 2) {
$x += $gx - $ax;
if($this->axis_no == 1)
$x += $g_width;
}
}
return [$x, $y, $opposite];
}
/**
* Returns the bounding box for a single axis label
*/
protected function measureText($x, $y, &$point, $opposite, $level)
{
list($svg_text, $font_size, $attr, $anchor, $rcx, $rcy, $angle,
$line_spacing) = $this->getTextInfo($x, $y, $point, $opposite, $level);
// find (rotated) size and position now
list($x, $y, $w, $h) = $svg_text->measurePosition($point->getText($level),
$font_size, $line_spacing, $attr['x'], $attr['y'], $anchor, $angle,
$rcx, $rcy);
// per-item text indent last
if($point->item && $point->axis_text_indent) {
if($opposite)
$w += $point->axis_text_indent;
else
$x -= $point->axis_text_indent;
}
return ['x' => $x, 'y' => $y, 'width' => $w, 'height' => $h];
}
/**
* Returns the SVG fragment for a single axis label
*/
protected function getText($x, $y, &$point, $opposite, $level, $anchor)
{
// skip 0 on axis when it would sit on top of other axis
if(!$this->block_label && $point->value == 0) {
if($this->axis_no == 0 && $opposite)
return '';
if($this->axis_no == 1 && !$opposite)
return '';
}
// see if the text needs shifting
if($point->item && $point->axis_text_indent) {
switch($this->styles['t_align']) {
case 'left' :
$x += $point->axis_text_indent;
break;
case 'centre':
// centred things can't be indented
break;
case 'right':
default:
$x -= $point->axis_text_indent;
break;
}
}
$string = $point->getText($level);
$text_out = '';
$text_info = $this->getTextInfo($x, $y, $point, $opposite, $level);
$svg_text = $text_info[0];
$attr = $text_info[2];
$line_spacing = $text_info[7];
$back_colour = $this->styles['t_back_colour'];
// $anchor overrides the one based on axis text location
if($anchor)
$attr['text-anchor'] = $anchor;
// structured data attributes?
if($point->item) {
if($point->axis_text_font)
$attr['font-family'] = $point->axis_text_font;
if($point->axis_text_font_size)
$attr['font-size'] = $point->axis_text_font_size;
if($point->axis_text_font_weight)
$attr['font-weight'] = $point->axis_text_font_weight;
if($point->axis_text_colour)
$attr['fill'] = new Colour($this->graph, $point->axis_text_colour);
if($point->axis_text_back_colour)
$back_colour = [
'stroke-width' => '3px',
'stroke' => new Colour($this->graph, $point->axis_text_back_colour),
'stroke-linejoin' => 'round',
];
}
if(!empty($back_colour)) {
$b_attr = array_merge($back_colour, $attr);
$text_out .= $svg_text->text($string, $line_spacing, $b_attr);
}
$text_out .= $svg_text->text($string, $line_spacing, $attr);
return $text_out;
}
/**
* Returns text information:
* [Text, $font_size, $attr, $anchor, $rcx, $rcy, $angle, $line_spacing]
*/
protected function getTextInfo($x, $y, &$point, $opposite, $level)
{
$font = $this->styles['t_font'];
$font_size = $this->styles['t_font_size'];
$font_adjust = $this->styles['t_font_adjust'];
if($point->item) {
if($point->axis_text_font)
$font = $point->axis_text_font;
if($point->axis_text_font_size)
$font_size = $point->axis_text_font_size;
if($point->axis_text_font_adjust)
$font_adjust = $point->axis_text_font_adjust;
}
$line_spacing = $this->styles['t_line_spacing'];
$svg_text = new Text($this->graph, $font, $font_adjust);
$baseline = $svg_text->baseline($font_size);
list($w, $h) = $svg_text->measure($point->getText($level), $font_size, 0,
$line_spacing);
if($this->orientation == 'h') {
$attr['x'] = $x + $point->position;
$attr['y'] = $y + $baseline - ($opposite ? $h : 0);
$anchor = 'middle';
} else {
$attr['x'] = $x;
$attr['y'] = $y + $baseline + $point->position - $h / 2;
$anchor = $opposite ? 'start' : 'end';
}
$angle = $this->styles['t_angle'];
$rcx = $rcy = null;
if($angle) {
if($this->orientation == 'h') {
$rcx = $x + $point->position;
$rcy = $y + $h * ($opposite ? -0.5 : 0.5);
if($angle < 0) {
$anchor = 'end';
$attr['x'] += $h * 0.5;
} else {
$anchor = 'start';
$attr['x'] -= $h * 0.5;
}
if($opposite)
$angle = -$angle;
} else {
$rcx = $attr['x'] + $h * ($opposite ? 0.5 : -0.5);
$rcy = $y + $point->position;
}
$xform = new Transform;
$xform->rotate($angle, $rcx, $rcy);
$attr['transform'] = $xform;
}
$attr['text-anchor'] = $anchor;
return [$svg_text, $font_size, $attr, $anchor, $rcx, $rcy, $angle,
$line_spacing];
}
/**
* Returns the path for divisions or subdivisions
*/
protected function getDivisionPath($x, $y, $points, $path_info, $level)
{
$y0 = $y;
$x0 = $x;
$yinc = $xinc = 0;
if($this->orientation == 'v')
{
$x0 = $x + $path_info['pos'];
$len = $path_info['sz'];
$yinc = 1;
}
else
{
$y0 = $y - $path_info['pos'];