欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

PHP生成条形图的方法

程序员文章站 2023-10-28 08:07:58
本文实例讲述了php生成条形图的方法。分享给大家供大家参考。具体实现方法如下: 复制代码 代码如下:

本文实例讲述了php生成条形图的方法。分享给大家供大家参考。具体实现方法如下:

复制代码 代码如下:

<?php
  // create an array of values for the chart. these values 
  // could come from anywhere, post, get, database etc. 
  $values = array(23,32,35,57,12,3,36,54,32,15,43,24,30);
 
  // now we get the number of values in the array. this will 
  // tell us how many columns to plot 
    $columns  = count($values);
 
  // set the height and width of the graph image
 
    $width = 300; 
    $height = 200;
 
  // set the amount of space between each column 
    $padding = 5;
 
  // get the width of 1 column 
    $column_width = $width / $columns ;
 
  // set the graph color variables 
    $im        = imagecreate($width,$height); 
    $gray      = imagecolorallocate ($im,0xcc,0xcc,0xcc); 
    $gray_lite = imagecolorallocate ($im,0xee,0xee,0xee); 
    $gray_dark = imagecolorallocate ($im,0x7f,0x7f,0x7f); 
    $white     = imagecolorallocate ($im,0xff,0xff,0xff);
 
  // set the background color of the graph 
    imagefilledrectangle($im,0,0,$width,$height,$white);
 
 
  // calculate the maximum value we are going to plot 
  $max_value = max($values);
 
  // loop over the array of columns 
    for($i=0;$i<$columns;$i++) 
        {
    // set the column hieght for each value 
        $column_height = ($height / 100) * (( $values[$i] / $max_value)
 
*100); 
    // now the coords
        $x1 = $i*$column_width; 
        $y1 = $height-$column_height; 
        $x2 = (($i+1)*$column_width)-$padding; 
        $y2 = $height;
 
        // write the columns over the background 
        imagefilledrectangle($im,$x1,$y1,$x2,$y2,$gray);
 
        // this gives the columns a little 3d effect 
        imageline($im,$x1,$y1,$x1,$y2,$gray_lite); 
        imageline($im,$x1,$y2,$x2,$y2,$gray_lite); 
        imageline($im,$x2,$y1,$x2,$y2,$gray_dark); 
        }
 
   // set the correct png headers 
   header ("content-type: image/png"); 
  // spit the image out the other end 
  imagepng($im); 
?>

运行效果如下图所示:

PHP生成条形图的方法

希望本文所述对大家的php程序设计有所帮助。