<?php
/* Libchart - PHP chart library
 * Copyright (C) 2005-2011 Jean-Marc Tr�meaux (jm.tremeaux at gmail.com)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/**
 * Line chart.
 *
 * @author Jean-Marc Tr�meaux (jm.tremeaux at gmail.com)
 */
class LineChart extends BarChart
{
    /**
     * Creates a new line chart.
     * Line charts allow for XYDataSet and XYSeriesDataSet in order to plot several lines.
     *
     * @param integer width of the image
     * @param integer height of the image
     */
    public function LineChart($width = 600, $height = 250)
    {
        parent::BarChart($width, $height);

        $this->plot->setGraphPadding(new Padding(5, 30, 50, 50));
    }

    /**
     * Computes the layout.
     */
    protected function computeLayout()
    {
        if ($this->hasSeveralSerie) {
            $this->plot->setHasCaption(true);
        }
        $this->plot->computeLayout();
    }

    /**
     * Print the axis.
     */
    protected function printAxis()
    {
        $minValue = $this->axis->getLowerBoundary();
        $maxValue = $this->axis->getUpperBoundary();
        $stepValue = $this->axis->getTics();

        // Get graphical obects
        $img = $this->plot->getImg();
        $palette = $this->plot->getPalette();
        $text = $this->plot->getText();

        // Get the graph area
        $graphArea = $this->plot->getGraphArea();

        // Vertical axis
        for ($value = $minValue; $value <= $maxValue; $value += $stepValue) {
            $y = $graphArea->y2 - ($value - $minValue) * ($graphArea->y2 - $graphArea->y1) / ($this->axis->displayDelta);

            imagerectangle($img, $graphArea->x1 - 3, $y, $graphArea->x1 - 2, $y + 1, $palette->axisColor[0]->getColor($img));
            imagerectangle($img, $graphArea->x1 - 1, $y, $graphArea->x1, $y + 1, $palette->axisColor[1]->getColor($img));

            $text->printText($img, $graphArea->x1 - 5, $y, $this->plot->getTextColor(), $value, $text->fontCondensed, $text->HORIZONTAL_RIGHT_ALIGN | $text->VERTICAL_CENTER_ALIGN);
        }

        // Get first serie of a list
        $pointList = $this->getFirstSerieOfList();

        // Horizontal Axis
        $pointCount = count($pointList);
        reset($pointList);
        $columnWidth = ($graphArea->x2 - $graphArea->x1) / ($pointCount - 1);

        for ($i = 0; $i < $pointCount; $i++) {
            $x = $graphArea->x1 + $i * $columnWidth;

            imagerectangle($img, $x - 1, $graphArea->y2 + 2, $x, $graphArea->y2 + 3, $palette->axisColor[0]->getColor($img));
            imagerectangle($img, $x - 1, $graphArea->y2, $x, $graphArea->y2 + 1, $palette->axisColor[1]->getColor($img));

            $point = current($pointList);
            next($pointList);

            $label = $point->getX();

            $text->printDiagonal($img, $x - 5, $graphArea->y2 + 10, $this->plot->getTextColor(), $label);
        }
    }

    /**
     * Print the lines.
     */
    protected function printLine()
    {
        $minValue = $this->axis->getLowerBoundary();
        $maxValue = $this->axis->getUpperBoundary();

        // Get the data as a list of series for consistency
        $serieList = $this->getDataAsSerieList();

        // Get graphical obects
        $img = $this->plot->getImg();
        $palette = $this->plot->getPalette();
        $text = $this->plot->getText();
        $primitive = $this->plot->getPrimitive();

        // Get the graph area
        $graphArea = $this->plot->getGraphArea();

        $lineColorSet = $palette->lineColorSet;
        $lineColorSet->reset();
        for ($j = 0; $j < count($serieList); $j++) {
            $serie = $serieList[$j];
            $pointList = $serie->getPointList();
            $pointCount = count($pointList);
            reset($pointList);

            $columnWidth = ($graphArea->x2 - $graphArea->x1) / ($pointCount - 1);

            $lineColor = $lineColorSet->currentColor();
            $lineColorShadow = $lineColorSet->currentShadowColor();
            $lineColorSet->next();
            $x1 = null;
            $y1 = null;
            for ($i = 0; $i < $pointCount; $i++) {
                $x2 = $graphArea->x1 + $i * $columnWidth;

                $point = current($pointList);
                next($pointList);

                $value = $point->getY();

                $y2 = $graphArea->y2 - ($value - $minValue) * ($graphArea->y2 - $graphArea->y1) / ($this->axis->displayDelta);

                // Draw line
                if ($x1) {
                    $primitive->line($x1, $y1, $x2, $y2, $lineColor, 4);
                    $primitive->line($x1, $y1 - 1, $x2, $y2 - 1, $lineColorShadow, 2);
                }

                $x1 = $x2;
                $y1 = $y2;
            }
        }
    }

    /**
     * Renders the caption.
     */
    protected function printCaption()
    {
        // Get the list of labels
        $labelList = $this->dataSet->getTitleList();

        // Create the caption
        $caption = new Caption();
        $caption->setPlot($this->plot);
        $caption->setLabelList($labelList);

        $palette = $this->plot->getPalette();
        $lineColorSet = $palette->lineColorSet;
        $caption->setColorSet($lineColorSet);

        // Render the caption
        $caption->render();
    }

    /**
     * Render the chart image.
     *
     * @param string name of the file to render the image to (optional)
     */
    public function render($fileName = null)
    {
        // Check the data model
        $this->checkDataModel();

        $this->bound->computeBound($this->dataSet);
        $this->computeAxis();
        $this->computeLayout();
        $this->createImage();
        $this->plot->printLogo();
        $this->plot->printTitle();
        if (!$this->isEmptyDataSet(2)) {
            $this->printAxis();
            $this->printLine();
            if ($this->hasSeveralSerie) {
                $this->printCaption();
            }
        }

        $this->plot->render($fileName);
    }
}

?>