Bar3DGraph::Draw PHP Méthode

    public function Draw()
    {
        // make sure project_angle is in range
        if ($this->project_angle < 0) {
            $this->project_angle = 0;
        } elseif ($this->project_angle > 90) {
            $this->project_angle = 90;
        }
        $body = $this->Grid() . $this->Guidelines(SVGG_GUIDELINE_BELOW);
        $values = $this->GetValues();
        $block_width = $this->bar_unit_width - $this->bar_space;
        // make the top parallelogram, set it as a symbol for re-use
        list($bx, $by) = $this->Project(0, 0, $block_width);
        $top_id = $this->NewID();
        $top = array('id' => $top_id, 'd' => "M0,0 l{$block_width},0 l{$bx},{$by} l-{$block_width},0 z");
        $this->defs[] = $this->Element('symbol', NULL, NULL, $this->Element('path', $top));
        $top = array('xlink:href' => '#' . $top_id);
        $bnum = 0;
        $bspace = $this->bar_space / 2;
        $ccount = count($this->colours);
        // get the translation for the whole bar
        list($tx, $ty) = $this->Project(0, 0, $this->bar_space / 2);
        $group = array('transform' => "translate({$tx},{$ty})");
        $baseline = $this->height - $this->pad_bottom - $this->y0;
        $bar = array('width' => $block_width);
        $bars = '';
        foreach ($values as $key => $value) {
            $bar_pos = $this->GridPosition($key, $bnum);
            if (!is_null($value) && !is_null($bar_pos)) {
                $bar['x'] = $bspace + $bar_pos;
                $bar['height'] = abs($value) * $this->bar_unit_height;
                $bar['y'] = $baseline - ($value > 0 ? $bar['height'] : 0);
                $this->Bar($value, $bar);
                $top['transform'] = "translate({$bar['x']},{$bar['y']})";
                $side_x = $bar['x'] + $block_width;
                $side = array('d' => "M0,0 l{$bx},{$by} l0,{$bar['height']} l-{$bx}," . -$by . " z", 'transform' => "translate({$side_x},{$bar['y']})");
                $group['fill'] = $this->GetColour($bnum % $ccount);
                $top['fill'] = $this->GetColour($bnum % $ccount, TRUE);
                $rect = $this->Element('rect', $bar);
                $bar_top = $this->Element('use', $top);
                $bar_side = $this->Element('path', $side);
                $link = $this->GetLink($key, $rect . $bar_top . $bar_side);
                if ($this->show_tooltips) {
                    $this->SetTooltip($group, $value);
                }
                $bars .= $this->Element('g', $group, NULL, $link);
                unset($group['id']);
                // make sure a new one is generated
                $style = $group;
                $this->SetStroke($style);
                $this->bar_styles[] = $style;
            }
            ++$bnum;
        }
        $bgroup = array('fill' => 'none');
        $this->SetStroke($bgroup, 'round');
        $body .= $this->Element('g', $bgroup, NULL, $bars);
        $body .= $this->Guidelines(SVGG_GUIDELINE_ABOVE) . $this->Axes();
        return $body;
    }