Question

我正在使用mPDF框架从Yii库生成pdf。对于这个PDF我需要添加在服务器上生成的图表，所以我使用pChart库来生成它们。我创建了一个简单的对象类，以便以更简单的方式为PDF设置pChart属性。

这是类对象：

<?php 
Class Chart {
    protected $fontsFolder = null;
    protected $data = array();
    protected $resolution = array();

    public $chartType = null;
    public $fontSize = 18;
    public $displayValues = false;
    public $dirFile = null;

    function __construct() {
        Yii::import('application.vendors.pChart.class.*', true);
        $this->fontsFolder = Yii::getPathOfALias('application.vendors.pChart.fonts');
    }

    // Set data points
    public function data($data) {
        if(!isset($data))
            throw new CException('Data array missing');

        if(!is_array($data))
            throw new CException('Data must be an array');

        $this->data[] = $data;
    }

    // Set label points
    public function labels($labels) {
        if(!isset($labels))
            throw new CException('Labels data must be assgined');
        if(!is_array($labels))
            throw new CException('Labels data must be an array');
        if(isset($this->data['labels']))
            throw new CException('Labels data is already assigned');
        $this->data['labels'] = $labels;
    }

    // Set resolution image
    public function resolution($x, $y) {
        if(isset($x) && isset($y)) {
            if(is_array($x) && is_array($y))
                throw new CException('Array to String error');
            $this->resolution['x'] = $x;
            $this->resolution['y'] = $y;
        } else
            throw new CException('Resolution data missing');
    }

    public function Debug() {
        var_dump($this->fontsFolder, $this->data, $this->resolution);
    }

    // Render chart with given data
    public function renderChart() {
        if(!$this->data)
            throw new CException('Data property must be assigned');

        if(!$this->resolution)
            throw new CException('Resolution property must be assigned');

        if(!$this->chartType)
            throw new CException('Chart type cannot be null');

        if(!$this->dirFile)
            throw new CException('Directory file must be assigned');

        $this->render();
    }


    protected function render() {
        switch ($this->chartType) {
            case 'lineChart':
                $this->lineChart();
                break;
            default:
                throw new CEXception('"'.$this->chartType.'" is not a valid chart type');
                break;
        }
    }

    protected function lineChart() {
        include('pDraw.class.php');
        include('pImage.class.php');
        include('pData.class.php');
        $data = new pData();
        foreach($this->data as $key => $value) {
            if(is_int($key))
                $data->addPoints($value);
        }
        $data->addPoints($this->data['labels'], 'labels');
        $data->setAbscissa('labels');
        $picture = new pImage($this->resolution['x'], $this->resolution['y'], $data);
        $picture->setFontProperties(array('FontName'=>$this->fontsFolder.'/Forgotte.ttf'), $this->fontSize);
        $picture->setGraphArea(60, 40, 970, 190);
        $picture->drawScale(array(
            'GridR'=>200,
            'GridG'=>200,
            'GridB'=>200,
            'DrawXLines'=>false
        ));
        $picture->drawLineChart(array('DisplayValues'=>$this->displayValues));
        $picture->render($this->dirFile);
    }
}
?>

以下是我用PDF设置实例化对象的方法：

<?php 
Class SeguimientoController extends Controller {
    // public $layout = '//layouts/column2';

    public function actionIndex() {
        // Cargar libreria pdf y estilos
        $mPDF = Yii::app()->ePdf->mpdf();
        $mPDF->debug = true;
        $mPDF->showImageErrors = true;
        $stylesheet = file_get_contents(Yii::getPathOfAlias('webroot.css.reporte') . '/main.css');
        $mPDF->WriteHTML($stylesheet, 1);

        // Generate first chart
        $chart = new Chart;
        $chart->data(array(1,2,3,4,5));
        $chart->Labels(array('asd', 'dead', 'eads', 'daed', 'fasd'));
        $chart->resolution(1000, 200);
        $chart->chartType = 'lineChart';
        $chart->displayValues = true;
        $chart->dirFile = Yii::getPathOfAlias('webroot.images').'/chart.png';
        $chart->renderChart();
        $mPDF->WriteHTml(CHtml::image('/basedato1/images/chart.png', 'chart'), 2);

        // Generate second chart
        $chart1 = new Chart;
        $chart1->data(array(1,2,3,4,5));
        $chart1->Labels(array('asd', 'dead', 'eads', 'daed', 'fasd'));
        $chart1->resolution(1000, 200);
        $chart1->chartType = 'lineChart';
        $chart1->displayValues = true;
        $chart1->dirFile = Yii::getPathOfAlias('webroot.images').'/chart.png';
        $chart1->renderChart();
        $mPDF->WriteHTml(CHtml::image('/basedato1/images/chart.png', 'chart'), 2);
        $mPDF->OutPut();
    }
}
?>

通过逐步测试视图的输出，一切正常，图表被渲染并保存为临时文件，因此pdf可以收集它。但是当我必须渲染第二张图表时，我会收到一个致命的错误。

我尝试创建另一个要由静态函数访问的类，因为我认为错误可以来自同一个对象的多个实例。但同样，在第二次渲染时我得到了同样的错误。

以防万一，如果您需要知道错误的输出方式，请输入：Fatal error: Cannot redeclare class pDraw in C:\Servidor\basedato1\protected\vendors\pChart\class\pDraw.class.php on line 104。

Answer 1

使用include_once代替include。

include_once('pDraw.class.php');
include_once('pImage.class.php');
include_once('pData.class.php');

致命错误：无法重新声明类pDraw

1 个答案: