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<?php |
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/** |
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* Copyright (C) 2018-2021 Graham Breach |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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/** |
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* For more information, please contact <graham@goat1000.com> |
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*/ |
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|
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namespace Goat1000\SVGGraph; |
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|
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/** |
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* A rotated axis |
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*/ |
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class DisplayAxisRotated extends DisplayAxis { |
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|
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protected $arad; |
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protected $anchor; |
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protected $top; |
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protected $label_offset = 0; |
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protected $label_angle = 0; |
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|
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/** |
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* $arad = angle in radians |
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*/ |
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public function __construct(&$graph, &$axis, $axis_no, $orientation, $type, |
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$main, $arad) |
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{ |
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if($orientation != 'v') |
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throw new \Exception('DisplayAxisRotated: orientation != "v"'); |
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$this->arad = $arad; |
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$this->anchor = 'end'; |
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$this->top = false; |
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parent::__construct($graph, $axis, $axis_no, $orientation, $type, $main, |
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false); |
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|
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// rotated axis can't position text at edge of grid |
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$this->styles['t_location'] = 'axis'; |
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} |
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|
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/** |
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* Draws the axis line |
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*/ |
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public function drawAxisLine($x, $y, $len) |
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{ |
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$overlap = $this->styles['overlap']; |
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$length = $len + $overlap * 2; |
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$x0 = $x - $overlap * sin($this->arad); |
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$y0 = $y - $overlap * cos($this->arad); |
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$x1 = $length * sin($this->arad); |
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$y1 = $length * cos($this->arad); |
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|
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$attr = [ |
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'stroke' => $this->styles['colour'], |
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'd' => new PathData('M', $x0, $y0, 'l', $x1, $y1), |
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]; |
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|
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if($this->styles['stroke_width'] != 1) |
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$attr['stroke-width'] = $this->styles['stroke_width']; |
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return $this->graph->element('path', $attr); |
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} |
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|
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/** |
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* Returns the path for divisions or subdivisions |
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*/ |
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protected function getDivisionPath($x, $y, $points, $path_info, $level) |
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{ |
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$a = $this->arad + ($this->arad <= M_PI_2 ? - M_PI_2 : M_PI_2); |
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$path = new PathData; |
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$c = cos($this->arad); |
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$s = sin($this->arad); |
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$px = $path_info['pos'] * sin($a); |
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$py = $path_info['pos'] * cos($a); |
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$x2 = $path_info['sz'] * sin($a); |
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$y2 = $path_info['sz'] * cos($a); |
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if($this->type == 'y') |
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{ |
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$px = -$px; |
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$py = -$py; |
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$x2 = -$x2; |
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$y2 = -$y2; |
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} |
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foreach($points as $pt) { |
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$x1 = ($x - $pt->position * $s) + $px; |
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$y1 = ($y - $pt->position * $c) + $py; |
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$path->add('M', $x1, $y1, 'l', $x2, $y2); |
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} |
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if($path != '' && $path_info['box']) { |
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$x1 = abs($path_info['box_len']) * $s; |
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$y1 = abs($path_info['box_len']) * $c; |
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$x -= $x2; |
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$y -= $y2; |
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$path->add('M', $x, $y, 'l', $x1, $y1); |
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} |
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return $path; |
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} |
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|
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/** |
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* Calculates the rotated offset |
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*/ |
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protected function getTextOffset($ax, $ay, $gx, $gy, $g_width, $g_height, $level) |
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{ |
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list($x, $y, $opposite) = parent::getTextOffset($ax, $ay, $gx, $gy, |
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$g_width, $g_height, $level); |
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|
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$tau = 2 * M_PI; |
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$a = $this->arad + M_PI_2; |
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while($a < 0) |
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$a += $tau; |
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$a = fmod($a, $tau); |
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|
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$t_angle = deg2rad($this->styles['t_angle']); |
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while($t_angle < 0) |
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$t_angle += $tau; |
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|
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$sector = floor(($a + $t_angle) * 15.999 / $tau) % 16; |
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$c = cos($a); |
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$s = sin($a); |
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$len = $x; |
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$x = -$len * $s; |
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$y = -$len * $c; |
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|
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// text anchor depends on angle between text and axis |
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$left = $opposite ? 'start' : 'end'; |
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$right = $opposite ? 'end' : 'start'; |
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$this->anchor = $right; |
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if($sector == 0 || $sector == 7 || $sector == 8 || $sector == 15) |
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$this->anchor = 'middle'; |
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elseif($sector > 8) |
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$this->anchor = $left; |
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$this->top = ($opposite ? $sector == 7 || $sector == 8 : |
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$sector == 0 || $sector == 15); |
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return [$x, $y, $opposite]; |
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} |
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|
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/** |
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* Returns text information: |
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* [Text, $font_size, $attr, $anchor, $rcx, $rcy, $angle, $line_spacing] |
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*/ |
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protected function getTextInfo($x, $y, &$point, $opposite, $level) |
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{ |
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$direction = $this->type == 'y' ? -1 : 1; |
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$x_add = $point->position * $direction * sin($this->arad); |
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$y_add = $point->position * $direction * cos($this->arad); |
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|
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$font_size = $this->styles['t_font_size']; |
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$line_spacing = $this->styles['t_line_spacing']; |
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$svg_text = new Text($this->graph, $this->styles['t_font'], |
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$this->styles['t_font_adjust']); |
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$baseline = $svg_text->baseline($font_size); |
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list($w, $h) = $svg_text->measure($point->getText(), $font_size, 0, |
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$line_spacing); |
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$attr = [ |
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'x' => $x + $x_add, |
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'text-anchor' => $this->anchor, |
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]; |
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|
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if($this->anchor == 'middle') |
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$attr['y'] = $y + $y_add + ($this->top ? $baseline : 0); |
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else |
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$attr['y'] = $y + $y_add + $baseline - $h / 2; |
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|
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$angle = $this->styles['t_angle']; |
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$rcx = $rcy = null; |
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if($angle) { |
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$rcx = $x + $x_add; |
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$rcy = $y + $y_add; |
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$xform = new Transform; |
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$xform->rotate($angle, $rcx, $rcy); |
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$attr['transform'] = $xform; |
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} |
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return [$svg_text, $font_size, $attr, $this->anchor, $rcx, $rcy, $angle, |
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$line_spacing]; |
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} |
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|
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/** |
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* Override position correction |
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*/ |
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protected function getLabelOffset($x, $y, $gx, $gy, $g_width, $g_height) |
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{ |
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// no need for correction |
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return ['x' => $x, 'y' => $y]; |
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} |
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|
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/** |
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* Returns the dimensions of the label |
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*/ |
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protected function getLabelPosition() |
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{ |
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$font_size = $this->styles['l_font_size']; |
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$line_spacing = $this->styles['l_line_spacing']; |
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$svg_text = new Text($this->graph, $this->styles['l_font']); |
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$tsize = $svg_text->measure($this->label, $font_size, 0, $line_spacing); |
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$baseline = $svg_text->baseline($font_size); |
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$c = cos($this->arad); |
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$s = sin($this->arad); |
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|
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// use plain axis for calculating distance from axis |
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$plain = new DisplayAxis($this->graph, $this->axis, $this->axis_no, |
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$this->orientation, $this->type, $this->main, false); |
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$bbox = $plain->measure(false); |
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$space = $this->styles['l_space']; |
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|
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if($s < 0) { |
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$offset = $bbox->x2 + $space + $tsize[1] - $baseline; |
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$angle = 180 - (rad2deg($this->arad) - 90); |
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} else { |
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$offset = -$bbox->x1 + $space + $tsize[1] - $baseline; |
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$angle = - (rad2deg($this->arad) - 90); |
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} |
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|
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$a = $this->arad + M_PI_2; |
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$x2 = $offset * sin($a); |
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$y2 = $offset * cos($a); |
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$p = $this->axis->getLength() / 2; |
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$tx = $p * sin($this->arad) + $x2; |
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$ty = $p * cos($this->arad) + $y2; |
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|
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// these don't matter - the text is over the graph anyway |
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$x = $y = $width = $height = 0; |
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|
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return compact('x', 'y', 'width', 'height', 'tx', 'ty', 'angle'); |
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} |
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|
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/** |
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* Returns true if the text exists |
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*/ |
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protected function pointTextVisible($point, $axis_len, $offset) |
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{ |
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return !$point->blank(); |
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} |
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} |
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|
