PieGraph::Draw PHP Method

    public function Draw()
    {
        if (!$this->calc_done) {
            $this->Calc();
        }
        $speed_in = $this->show_labels && $this->label_fade_in_speed ? $this->label_fade_in_speed / 100.0 : 0;
        $speed_out = $this->show_labels && $this->label_fade_out_speed ? $this->label_fade_out_speed / 100.0 : 0;
        // take a copy for sorting
        $values = $this->GetValues();
        $total = array_sum($values);
        $unit_slice = 2.0 * M_PI / $total;
        $ccount = count($this->colours);
        $vcount = count($values);
        $sub_total = 0.0;
        // need to store the original position of each value, because the
        // sorted list must still refer to the relevant legend entries
        $position = 0;
        foreach ($values as $key => $value) {
            $values[$key] = array($position++, $value);
        }
        if ($this->sort) {
            uasort($values, 'PieGraph::svggpsort');
        }
        $body = '';
        $labels = '';
        $slice = 0;
        foreach ($values as $key => $value) {
            // get the original array position of the value
            $original_position = $value[0];
            $value = $value[1];
            if (!$value) {
                continue;
            }
            ++$slice;
            $angle_start = $sub_total * $unit_slice;
            $angle_end = ($sub_total + $value) * $unit_slice;
            // get the path (or whatever) for a pie slice
            $attr = array('fill' => $this->GetColour(($slice - 1) % $ccount, true));
            $style = $attr;
            $this->SetStroke($style);
            // store the current style referenced by the original position
            $this->slice_styles[$original_position] = $style;
            if ($this->show_tooltips) {
                $this->SetTooltip($attr, $key, $value, !$this->compat_events);
            }
            $t_style = NULL;
            if ($this->show_labels) {
                $ac = $this->s_angle + ($sub_total + $value * 0.5) * $unit_slice;
                $xc = $this->label_position * $this->radius_x * cos($ac);
                $yc = ($this->reverse ? -1 : 1) * $this->label_position * $this->radius_y * sin($ac);
                $text['id'] = $this->NewID();
                if ($this->label_fade_in_speed && $this->compat_events) {
                    $text['opacity'] = '0.0';
                }
                $tx = $this->x_centre + $xc;
                $ty = $this->y_centre + $yc + $this->label_font_size * 0.3;
                // display however many lines of label
                $parts = array($key);
                if ($this->show_label_amount) {
                    $parts[] = $value;
                }
                if ($this->show_label_percent) {
                    $parts[] = $value / $total * 100.0 . '%';
                }
                $x_offset = empty($this->label_back_colour) ? $tx : 0;
                $string = $this->TextLines($parts, $x_offset, $this->label_font_size);
                if (!empty($this->label_back_colour)) {
                    $labels .= $this->ContrastText($tx, $ty, $string, $this->label_colour, $this->label_back_colour, $text);
                } else {
                    $text['x'] = $tx;
                    $text['y'] = $ty;
                    $text['fill'] = $this->label_colour;
                    $labels .= $this->Element('text', $text, NULL, $string);
                }
            }
            if ($speed_in || $speed_out) {
                $this->SetFader($attr, $speed_in, $speed_out, $text['id'], !$this->compat_events);
            }
            $path = $this->GetSlice($angle_start, $angle_end, $attr);
            $body .= $this->GetLink($key, $path);
            $sub_total += $value;
        }
        // group the slices
        $attr = array();
        $this->SetStroke($attr, 'round');
        $body = $this->Element('g', $attr, NULL, $body);
        if ($this->show_labels) {
            $label_group = array('text-anchor' => 'middle', 'font-size' => $this->label_font_size, 'font-family' => $this->label_font, 'font-weight' => $this->label_font_weight);
            $labels = $this->Element('g', $label_group, NULL, $labels);
        }
        return $body . $labels;
    }

 public function Draw()
 {
     // modify pad_bottom to make PieGraph do the hard work
     $pb = $this->pad_bottom;
     $this->pad_bottom += $this->depth;
     $this->Calc();
     $this->pad_bottom = $pb;
     return PieGraph::Draw();
 }