Common class usage in view

Yii 1.1 General Discussion
1

Hi all,

I have created a common class to contain all the code to plot x,y maps and render them in svg.

I am testing various map building functions and am trying to invoke one of these functions in the main app index.php

Here is the class:


class omegaMap {

    

    public $x;

    public $y;

    

    public $map;

    

    public function omegaMap($xin, $yin)

      {

		$x=$xin;

		$y=$yin;

      }

    

     

    public function testMap ($width, $height) {

      $map = "<svg xmlns=\"xxxxxxxxxxxxx" width=\"".$width."px\" height=\"".$height."px\" viewBox=\"0 0 ".$width." ".$height."\">\n" ;

      $map .= "<g transform=\"translate(0,$height) scale(1,-1)\">\n";

      $map .= "<circle cx=\"".$x."\" cy=\"".$y."\" r=\"3\" fill=\"red\"/>\n";

      $map .= "</g>\n</svg>\n";

      return $map;

    }

}

I am trying to get the string $map in index.pho this way:


<p><?php $map = new omegaMap(200,200);

         echo $map::testMap(400,400); ?></p>

The $x and $y in the class are not being stored and are unassigned in the function call testMap.

Any help or thoughts would be a appreciated.

2

Hi welcome to the Yii forum…

The contruction method in PHP is __construct() - http://php.net/manual/en/language.oop5.decon.php

3

I tried using this before:


public function __construct($x,$y) {

  $x = $xin;

  $y = $yin;

}

When this line is executed:


map .= "<circle cx=\"".$x."\" cy=\"".$y."\" r=\"3\" fill=\"red\"/>\n";

an error is generated " Undefined variable: x "

When I use this constuctor:


public function __construct($x,$y) {

  $this->x = $xin;

  $this->y = $yin;

}

PHP looks to SiteController for $this->x

4

You need to learn first some basics about PHP…

Check this documentation - http://www.php.net/manual/en/language.oop5.properties.php

$this refers to the current object…

So your code should be




public $x;

public $y;

public function __construct($xin,$yin) {

  $this->x = $xin;

  $this->y = $yin;

}
5

Evidently not in yii. Referencing $this-x in the circle generation statement has PHP looking in the SiteController class for x.

6

it works even in Yii… but you have some other error…

Note that in your original post there are other errors too… like:

you have declared a public $map… but in the testMap() you use a local variable $map instead of the class variable $this->map

Again in the testMap() you need to use $this->x

The first line in testMap has an double quote not escaped (\"xxxxxxxx" <- last one is not escaped)

And testMap is not static so you cannot call it like


echo $map::testMap(400,400);

, but as


echo $map->testMap(400,400);

If you still don’t get it working please post here your current class code and how you call it…

7

Thanks for your help.

Here is the class:


class omegaMap {

    

    public $x;

    public $y;

    

    public $map;

    

    public function __construct($xin, $yin)

      {

		$this->x=$xin;

		$this->y=$yin;

      }

    

     

    public function testMap ($width, $height) {

      $map = "<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"".$width."px\" height=\"".$height."px\" viewBox=\"0 0 ".$width." ".$height."\">\n" ;

      $map .= "<g transform=\"translate(0,$height) scale(1,-1)\">\n";

      $map .= "<circle cx=\"".$x."\" cy=\"".$y."\" r=\"3\" fill=\"red\"/>\n";

      $map .= "</g>\n</svg>\n";

      return $map;

    }

}

Here is how I called it:


<p><?php $map = new omegaMap(200,200);

         echo $map->testMap(400,400); ?></p>

Here is the error:

On the line -> <circle cx=\"".$x."\" cy=\"".$y."\" r=\"3\" fill=\"red\"/>

Undefined variable: x

8

$this->x

$this->y

/Tommy

9

Thanks.