Drawing file suddenly not working

[Nodral]

Hi

 

I have created the following file to output results from a questionnaire in a visual way.  This was working absolutely fine, but now has decided to stop working.  All I did was navigate to a different web page.  I have tried closing my browser and clearing cache etc but still it won't output to a web page.

 

I get the windows pop-up of 'Open, Save or Cancel'  If I chose open, it simply opens the file in notepad.

 

Any ideas?

 

<?php

//Create image size and initiate
$image=imagecreate(1000,1000);

//Allocate colours (1st is always background)

$background=imagecolorallocate($image, 255, 255, 255);
$white = imagecolorallocate($image, 255, 255, 255);
$black = imagecolorallocate($image, 0, 0, 0);
$red = imagecolorallocate($image, 255, 0, 0);

//array of results
$activist=10;
$reflector=18;
$theorist=17;
$pragmatist=9;

//set zeros for x & y
$x=500;
$y=500;

//change results into coordinates
$values=array(
$x, $y-($activist*20),
$x+($reflector*20), $y,
$x, $y+($theorist*20),
$x-($pragmatist*20), $y);




//create vertices
//x axis
imageline($image, 500, 100, 500, 900, $black);

//y axis
imageline($image, 100, 500, 900, 500, $black);

// create picture

imagefilledpolygon($image, $values, 4, $black);
//change to outline


//add titles

// Path to our ttf font file
$font_file = 'arial.ttf';

//create labels for axis
imagefttext($image, 20, 0, 450,50,$black, 'arial.ttf',"Activist" );
imagefttext($image, 20, 0, 450,950,$black, 'arial.ttf',"Theorist" );
imagefttext($image, 20, 90, 50,550,$black, 'arial.ttf',"Pragmatist" );
imagefttext($image, 20, 90, 950,550,$black, 'arial.ttf',"Reflector" );

//create labels for co-ordinates
imagefttext($image, 20, 0, $x, $y-($activist*20)-50,$red, 'arial.ttf',"$activist" );
imagefttext($image, 20, 0, $x, $y+($theorist*20)+50,$red, 'arial.ttf',"$theorist" );
imagefttext($image, 20, 0, $x-($pragmatist*20)-50,$y,$red, 'arial.ttf',"$pragmatist" );
imagefttext($image, 20, 0, $x+($reflector*20)+50,$y,$red, 'arial.ttf',"$reflector" );

//set header
header("content-type:image.png");

//produce image

imagepng($image);




?>

[teynon]

header('Content-Type: image/png');