<?php

/**
 * DomFramework
 * @package domframework
 * @author Dominique Fournier <dominique@fournier38.fr>
 * @license BSD
 */

namespace Domframework;

/**
 * The graph Axis Horizontal class
 */
class GraphAxisHorizontal extends GraphAxisGeneral
{
    /**
     * Calculate the position in pixels for a value
     * If the value is out of range, return null to not draw the point
     * @param string|float|integer $value The value to position
     */
    public function position($value)
    {
        if ($value === null) {
            return null;
        }
        if (! is_numeric($value) && ! is_string($value)) {
            throw new \Exception(dgettext(
                "domframework",
                "Invalid value provided to graph Axis for position"
            ) . " " .
            get_class($this), 406);
        }
        if ($this->numerical === null) {
            throw new \Exception(dgettext(
                "domframework",
                "No numerical type defined for Axis"
            ) . " " . get_class($this), 406);
        }
        if ($this->numerical) {
            // Numerical axis, use a standard scale
            if ($value < $this->min || $value > $this->max) {
                return null;
            }
            if (($this->max - $this->min) == 0) {
                $dividor = 1;
            } else {
                $dividor = ($this->max - $this->min);
            }
            $scale = ($value - $this->min) / $dividor;
            return intval($this->left + $scale * ($this->right - $this->left));
        } else {
            // Label axis, count them
            if (! is_array($this->data)) {
                throw new \Exception(dgettext(
                    "domframework",
                    "No data defined for Axis"
                ) . " " . get_class($this), 406);
            }
            $pos = array_search($value, $this->data, true);
            if ($pos === false) {
                return null;
            }
            $width = ($this->right - $this->left) / count($this->data);
            return intval($this->left + $width * $pos + $width / 2);
        }
    }

    /**
     * Calculate the positionMin, used for labeled axies
     * If the value is out of range, return null to not draw the point
     * @param string|float|integer $value The value to position
     */
    public function positionMin($value)
    {
        $posCenter = $this->position($value);
        if ($this->numerical) {
            return $posCenter;
        }
        if (! is_array($this->data)) {
            throw new \Exception(dgettext(
                "domframework",
                "No data defined for Axis"
            ) . " " . get_class($this), 406);
        }
        $pos = array_search($value, $this->data, true);
        if ($pos === false) {
            return null;
        }
        $width = ($this->right - $this->left) / count($this->data);
        return intval($this->left + $width * $pos);
    }

    /**
     * Calculate the positionMax, used for labeled axies
     * If the value is out of range, return null to not draw the point
     * @param string|float|integer $value The value to position
     */
    public function positionMax($value)
    {
        $posCenter = $this->position($value);
        if ($this->numerical) {
            return $posCenter;
        }
        if (! is_array($this->data)) {
            throw new \Exception(dgettext(
                "domframework",
                "No data defined for Axis"
            ) . " " . get_class($this), 406);
        }
        $pos = array_search($value, $this->data, true);
        if ($pos === false) {
            return null;
        }
        $width = ($this->right - $this->left) / count($this->data);
        return intval($this->left + $width * $pos + $width);
    }
}