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Thread: GDLib Graphing Class

  1. #1

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    Terrible Member dclamp's Avatar
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    GDLib Graphing Class

    Intro
    I made this class because i could not, for the life of me, find a basic x/y axis graph for php. With this class you can do the following:
    • Graph Multiple Objects
    • Graph unlimited X/Y Cooridnate Pairs
    • Choose Color for each Object


    The Class
    PHP Code:
    header("Content-type: image/png");
    header("Cache-Control: no-cache, must-revalidate");
    header("Expires: Sat, 26 Jul 1997 05:00:00 GMT");

    class 
    graph {
        
        var 
    $imgx;
        var 
    $imgy
        
    //var $scale;
        
    var $mult;
        var 
    $xorigin;
        var 
    $yorigin;
        var 
    $image;
        var 
    $clrWhite;
        var 
    $clrBlack;
        var 
    $clrRed;
        var 
    $currentColor;
        
         function 
    __construct() {
            
    $this->imgx 400;
            
    $this->imgy 400;
            
    $this->mult 10;
            
            
    $this->xorigin = ($this->imgx/2);
            
    $this->yorigin = ($this->imgy/2);
            
            
    $this->image imagecreate($this->imgx$this->imgy);
            
    $this->clrWhite imagecolorallocate($this->image255255255);
            
    $this->clrBlack imagecolorallocate($this->image000);
            
    $this->clrRed imagecolorallocate($this->image25500);
        
            
    $this->buildAxis();
            
        }
        
        function 
    buildAxis() {
            
    // CREATE X-AXIS
                
    imageline($this->image0$this->yorigin$this->imgx$this->yorigin$this->clrBlack);
                
            
    // CREATE Y-AXIS
                
    imageline($this->image$this->xorigin0$this->xorigin$this->imgy$this->clrBlack);
        }
        
        function 
    makeGraph($grapharray) {
            
    $parabolacount count($grapharray);
            
            
    $p 0;
            for (
    $p$p <= $parabolacount$p++) {
                if (
    count($grapharray[$p][2])!= 3) {
                    
    $red rand(0,255);
                    
    $green rand(0,255);
                    
    $blue rand(0,255);
                } else {
                    if (
    $grapharray[$p][2][0] > 255 || $grapharray[$p][2][0] < 0) {
                        
    $red 0;
                    } else {
                        
    $red $grapharray[$p][2][0];
                    }
                    if (
    $grapharray[$p][2][1] > 255 || $grapharray[$p][2][1] < 0) {
                        
    $green 0;
                    } else {
                        
    $green $grapharray[$p][2][1];
                    }
                    if (
    $grapharray[$p][2][2] > 255 || $grapharray[$p][2][2] < 0) {
                        
    $blue 0;
                    } else {
                        
    $blue $grapharray[$p][2][2];
                    }
                }
                
    $this->currentColor imagecolorallocate($this->image$red$green$blue);
                
    $this->drawLines($grapharray[$p][0], $grapharray[$p][1], $this->currentColor);
            }
            
        }
        
        function 
    drawLines($x$y$color) {
            
    //print_r($x);
            
            
    $xcount count($x);
            
    $i 0;
            for (
    $i$i<=$xcount$i++) {
                if (
    $i != $xcount-1) {
                    
    imageline($this->image, ($this->xorigin+($x[$i])*$this->mult), ($this->yorigin-($y[$i])*$this->mult), ($this->xorigin+($x[$i+1])*$this->mult), ($this->yorigin-($y[$i+1])*$this->mult), $color);
                } else {
                    
    imageline($this->image, ($this->xorigin+($x[$i])*$this->mult), ($this->yorigin-($y[$i])*$this->mult), ($this->xorigin+($x[$i])*$this->mult), ($this->yorigin-($y[$i])*$this->mult), $color);
                }
            }
        }
        
        function 
    __destruct() {
            
    imagepng($this->image);
            
    imagedestroy($this->image);
        }

    Usage
    Create a graph.php page. The following is an example:
    PHP Code:
    include ('class.graph.php');
    $graph = new graph;

    $graph->makeGraph(
        array(
            
    //parabola 1
            
    array(
                
    //x point
                
    array(-3,-2,-1,0,1,2,3),
                
    //y points
                
    array(9,4,1,0,1,4,9),
                
    //color RGB
                
    array(25500)
            ),
            
    //parabola 2
            
    array(
                
    //x point
                
    array(-3,-2,-1,0,1,2,3),
                
    //y points
                
    array(-9,-4,-1,0,-1,-4,-9),
                
    //color RGB
                
    array(00255)
            )
        )
    ); 
    Then, where ever you want that graph to show, use the Image Tag:
    HTML Code:
    <img src="graph.php">



    Here is another example, allowing you to set the points through $_GET. Although, this only allows 1 object At the moment.
    PHP Code:
    if ($_GET['x'] != "" && $_GET['y'] != "") {
        
    $xa explode(','$_GET['x']);
        
    $ya explode(','$_GET['y']);
        
        include (
    'class.graph.php');
        
    $graph = new graph;
        
        
    $graph->makeGraph(
            array(
                
    //parabola 1
                
    array(
                    
    //x point
                    
    $xa,
                    
    //y points
                    
    $ya,
                    
    //color RGB
                    
    array(25500)
                )
            )
        );


    The IMG tag:
    HTML Code:
    <img src="graph.php?x=-3,-2,-1,0,1,2,3&y=-9,-4,-1,0,-1,-4,-9">
    Last edited by dclamp; Feb 4th, 2014 at 11:16 PM. Reason: Updated IMG URL

  2. #2
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    Sep 2005
    Posts
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    Re: GDLib Graphing Class

    This is pretty sweet from what I can see. Will check it out soon!

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