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这篇文章给大家介绍利用PHP怎么实现一个条形图生成功能,内容非常详细,感兴趣的小伙伴们可以参考借鉴,希望对大家能有所帮助。
具体实现方法如下:
<?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:
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