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<?php |
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/** |
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* Copyright (C) 2022 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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class Bar3DCylinder extends Bar3D { |
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|
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protected $ellipse; |
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protected $arc_path; |
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protected $cyl_offset_x; |
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protected $cyl_offset_y; |
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protected $shade_gradient_id; |
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|
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public function __construct(&$graph) |
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{ |
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parent::__construct($graph); |
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$gradient = $graph->getOption('depth_shade_gradient'); |
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if(is_array($gradient)) |
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$this->shade_gradient_id = $graph->defs->addGradient($gradient); |
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} |
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|
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/** |
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* Calculates the a and b radii of the ellipse filling the parallelogram |
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*/ |
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protected function findEllipse() |
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{ |
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$alpha = deg2rad($this->angle / 2); |
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$x = $this->depth * cos($alpha) / 2; |
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$y = $this->depth * sin($alpha) / 2; |
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$dydx = -$y / $x; |
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|
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$bsq = pow($y, 2) - $x * $y * $dydx; |
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$asq = pow($x, 2) / (1 - $y / ($y - $x * $dydx)); |
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|
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$a = sqrt($asq); |
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$b = sqrt($bsq); |
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|
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// now find the vertical |
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$alpha2 = deg2rad(- $this->angle / 2 - 90); |
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$dydx2 = tan($alpha2); |
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$ysq = $bsq / (pow($dydx2, 2) * ($asq / $bsq) + 1); |
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$xsq = $asq - $asq * $ysq / $bsq; |
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|
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$x1 = sqrt($xsq); |
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$y1 = -sqrt($ysq); |
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$this->ellipse = compact('a', 'b', 'x1', 'y1'); |
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|
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// create the arc path |
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$r = -$this->angle / 2; |
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$rr = deg2rad($r); |
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$x1a = -($x1 * cos($rr) + $y1 * sin($rr)); |
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$y1a = -($x1 * sin($rr) - $y1 * cos($rr)); |
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$x2 = -2 * $x1a; |
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$y2 = -2 * $y1a; |
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$this->cyl_offset_x = $x1a; |
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$this->cyl_offset_y = $y1a; |
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$this->arc_path = new PathData('a', $a, $b, $r, 1, 0, $x2, $y2); |
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} |
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|
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/** |
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* Sets the depth of the bar |
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*/ |
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public function setDepth($d) |
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{ |
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parent::setDepth($d); |
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$this->findEllipse(); |
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} |
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|
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/** |
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* Draws bar front |
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*/ |
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protected function front($x, $y, $w, $h) |
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{ |
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$x += $this->cyl_offset_x; |
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$y += $this->cyl_offset_y; |
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$path = new PathData('M', $x, $y, 'v', $h); |
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$path->add($this->arc_path); |
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$path->add('v', -$h); |
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$f = ['d' => $path, 'stroke' => 'none']; |
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$front = $this->graph->element('path', $f); |
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|
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if($this->shade_gradient_id) { |
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$f['fill'] = 'url(#' . $this->shade_gradient_id . ')'; |
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$front .= $this->graph->element('path', $f); |
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} |
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|
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$f = ['d' => $path, 'fill' => 'none', 'stroke-linejoin' => 'bevel']; |
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$front .= $this->graph->element('path', $f); |
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return $front; |
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} |
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|
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/** |
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* Draws bar top |
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*/ |
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protected function top($x, $y, $w, $h) |
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{ |
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$r = -$this->angle / 2; |
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$xform = new Transform; |
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$xform->translate($x, $y); |
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$xform->rotate($r); |
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$t = [ |
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'cx' => 0, 'cy' => 0, |
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'rx' => $this->ellipse['a'], 'ry' => $this->ellipse['b'], |
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'transform' => $xform, |
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'fill' => $this->solid_colour, |
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]; |
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if($this->overlay_top) |
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$t['stroke'] = 'none'; |
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$top = $this->graph->element('ellipse', $t); |
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|
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if($this->overlay_top) { |
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$t['fill-opacity'] = $this->overlay_top; |
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$t['fill'] = $this->overlay_top_colour; |
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unset($t['stroke']); |
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$top .= $this->graph->element('ellipse', $t); |
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} |
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return $top; |
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} |
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|
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/** |
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* Draws bar side |
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*/ |
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protected function side($x, $y, $w, $h) |
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{ |
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return ''; |
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} |
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|
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/** |
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* Draws bar edge path |
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*/ |
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protected function edge($x, $y, $w, $h) |
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{ |
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// cylinder edge is drawn with front |
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return ''; |
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} |
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} |
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|
