<?php
  $width = 400;
  $height = 300;  

  $data = array();
  for( $i = 0; $i < 500; $i++ )
  {
      $data []= sin( deg2rad( ( $i / 500 ) * 360 ) );
  }
 

  $xstart = $width/10;
  $ystart = $height - ($height/10);
 
  $image = imagecreate($width, $height);
  $back = imagecolorallocate($image, 255, 255, 255);
  $border = imagecolorallocate($image, 64, 64, 64);
 
  imageline( $image, $xstart, 0, $xstart, $ystart, $border );
  imageline( $image, $xstart, $ystart, $width, $ystart, $border );
 
  imagestring( $image, 2, $xstart-20, $ystart-10, "1", $border );
  imagestring( $image, 2, $xstart-20, 0, "-1", $border );
  imagestring( $image, 2, $xstart, $ystart+5, "0", $border );
  imagestring( $image, 2, $width-20, $ystart+5, "360", $border );
 
  $datatop = 1;
  $databottom = -1;
 
  $oldx = 0;
  $oldy = 0;
  $datacount = count( $data );
  $xscale = ( $width - $xstart ) / $datacount;
  $yscale = $ystart / ( $datatop - $databottom );
  $midline = $ystart / 2;
  for( $i = 0; $i < $datacount; $i++ )
  {
      $x = $xstart + ( $i * $xscale );
      $y = $midline - ( $data[$i] * $yscale );
      if ( $i > 0 )
      {
          imageline( $image, $oldx, $oldy, $x, $y, $border );
      }
      $oldx = $x;
      $oldy = $y;
  }header("Content-type: image/png");
  imagepng($image);
  imagedestroy($image);  
?>


[ 此贴被自由的龙在2006-05-11 14:01重新编辑 ]

我怎么看不到源代码呢

路过顶一下。。。