Bar chart implemented by GD in PHP

In PHP, the column chart implemented by GD is used. in PHP, the column chart implemented by GD is used. you can write a class to draw a column chart and use the code.

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 Title = $ title; 20 $ this-> xdata = $ xdata; 21 $ this-> ydata = $ ydata; 22 $ this-> color = array ('#058DC7 ', '#50B432', '# ED561B', '# DDDF00', '#24CBE5', '#64E572', '# ff9655',' # fff263 ', '#6AF9C4'); 23} 24 25/* 26 * public method, set the bar chart color 27 * Array color Array, the element value is '# 058dc7' in this format 28 */29 function setBarColor ($ color) {30 $ this-> color = $ color; 31} 32 33/* 34 * public method, bar chart 35 */36 function mkBarChart () {37 $ ydata Num = $ this-> arrayNum ($ this-> ydata); // get the number of data groups 38 $ max = $ this-> arrayMax ($ this-> ydata ); // get the maximum value of all rendered data 39 $ multi = ($ max> 100 )? $ Max/100: 1; // if the maximum data size is greater than 100, compress the data and obtain 40 $ barHeightMulti = 2.2; // the ratio of bar height scaling is 41 $ barWidth = (16-2 * ($ ydataNum-1)> 10? (16-2 * ($ ydataNum-1): 10; // The bar width is 42 $ barSpace = 16; // the spacing between the entries is 43 $ chartLeft = (1 + strlen ($ max) * 12; // Set margin 44 45 $ barY = 250 on the left of the image; // initialize Y coordinate 46 of the bar chart // set the width and height of the image to 47 $ this-> width = ($ ydataNum * $ barWidth + $ barSpace) * count ($ this-> xdata) + $ chartLeft; 48 $ this-> height = 300; 49 $ this-> image = imagecreatetruecolor ($ this-> width, $ this-> height); // prepare the canvas 50 $ this-> bgcolor = imagecolorallocate ($ thi S-> image, 255,255,255); // The background color of the image 51 52 // set the bar chart color 53 $ color = array (); 54 foreach ($ this-> color as $ col) {55 $ col = substr ($ col, 1, strlen ($ col)-1 ); 56 $ red = hexdec (substr ($ col,); 57 $ green = hexdec (substr ($ col )); 58 $ blue = hexdec (substr ($ col, 4, 2); 59 $ color [] = imagecolorallocate ($ this-> image, $ red, $ green, $ blue ); 60} 61 62 // set the line segment color, font color, and font path 63 $ lineColor = imagecolorallocate ($ t His-> image, 0xcc, 0xcc, 0xcc); 64 $ fontColor = imagecolorallocate ($ this-> image, 0x95, 0x8f, 0x8f ); 65 $ fontPath = 'font/simsun. ttc '; 66 67 imagefill ($ this-> image, 0, 0, $ this-> bgcolor ); // painting background 68 69 // the short-term and left-side edges of the painting graph 70 for ($ I = 0; $ I <6; $ I ++) {71 imageline ($ this-> image, $ chartLeft-10, $ barY-$ barHeightMulti * $ max/5/$ multi * $ I, $ this-> width, $ barY-$ barHeightMulti * $ max/5/$ multi * $ I, $ lineColor); 72 imagestring ($ This-> image, $ barY-$ barHeightMulti * $ max/5/$ multi * $ I-8, floor ($ max/5 * $ I), $ fontColor ); 73} 74 imageline ($ this-> image, $ chartLeft-10, 30, $ chartLeft-10, $ barY, $ lineColor); 75 imageline ($ this-> image, $ this-> width-1, 30, $ this-> width-1, $ barY, $ lineColor ); 76 77 // The 78 foreach ($ this-> ydata as $ key => $ val) {79 if ($ ydataNum = 1) {80 // 81 $ barX = $ chartLeft + 3 + ($ barWidth + $ barSpace) * $ key; 82 imagefilledrectangle ($ this-> image, $ barX, $ barY-$ barHeightMulti * $ val/$ multi, $ barX + $ barWidth, $ barY, $ color [$ key % count ($ this-> color)]); 83} elseif ($ ydataNum> 1) {84 // when data of multiple generations is 85 $ cbarSpace = $ barSpace + $ barWidth * ($ ydataNum-1); 86 foreach ($ val as $ ckey => $ cval) {87 $ barX = $ chartLeft + 3 + $ barWidth * $ key + $ ckey * ($ cbarSpace + $ barWidth); 88 imagefilledrectangle ($ this-> image, $ barX, $ barY-$ barHeigh TMulti * $ cval/$ multi, $ barX + $ barWidth, $ barY, $ color [$ key % count ($ this-> color)]); 89} 90} 91 92} 93 94 // the x coordinate value of the bar chart is 95 foreach ($ this-> xdata as $ key => $ val) {96 $ barX = $ chartLeft + ($ ydataNum * $ barWidth + $ barSpace) * $ key + $ ydataNum * $ barWidth/3; 97 imagettftext ($ this-> image, 10,-45, $ barX, $ barY + 15, $ fontColor, $ fontPath, $ this-> xdata [$ key]); 98} 99 100 // painting title 101 $ titleStart = ($ this-> width-5.5 * strle N ($ this-> title)/2; 102 imagettftext ($ this-> image, 11, 0, $ titleStart, 20, $ fontColor, $ fontPath, $ this-> title); 103 104 // output image 105 header ("Content-Type: image/png"); 106 imagepng ($ this-> image ); 107} 108 109/* 110 * Private method. when the array is a binary array, the length of the statistical Array is 111 * Array arr. the Array to be counted is 112 */113 private function arrayNum ($ arr) {114 $ num = 0; 115 if (is_array ($ arr )) {116 $ num ++; 117 for ($ I = 0; $ I <count ($ arr); $ I ++) {118 if (is_array ($ Arr [$ I]) {119 $ num = count ($ arr); 120 break; 121} 122} 123} 124 return $ num; 125} 126 127/* 128 * private method, calculate the depth of the Array 129 * Array arr Array 130 */131 private function arrayDepth ($ arr) {132 $ num = 0; 133 if (is_array ($ arr) {134 $ num ++; 135 for ($ I = 0; $ I <count ($ arr); $ I ++) {136 if (is_array ($ arr [$ I]) {137 $ num + = $ this-> arrayDepth ($ arr [$ I]); 138 break; 139} 140} 141} 142 return $ num; 143} 144 145/* 146 * Private method, find a group Maximum value 147 * Array arr numeric Array 148 */149 private function arrayMax ($ arr) {150 $ depth = $ this-> arrayDepth ($ arr); 151 $ max = 0; 152 if ($ depth = 1) {153 rsort ($ arr); 154 $ max = $ arr [0]; 155} elseif ($ depth> 1) {156 foreach ($ arr as $ val) {157 if (is_array ($ val) {158 if ($ this-> arrayMax ($ val)> $ max) {159 $ max = $ this-> arrayMax ($ val); 160} 161} else {162 if ($ val >$ max) {163 $ max = $ val; 164} 165} 166} 167} 168 Return $ max; 169} 170 171 function arrayAver ($ arr) {172 $ aver = array (); 173 foreach ($ arr as $ val) {174 if (is_array ($ val) {175 $ aver = array_merge ($ aver, $ val); 176} else {177 $ aver [] = $ val; 178} 179} 180 return array_sum ($ aver)/count ($ aver); 181 182} 183 // destructor 184 function _ destruct () {185 imagedestroy ($ this-> image); 186} 187} 188?>

This class can be used to draw a series of column charts and multiple series of column charts, as shown below:

Column charts of a series

Column charts of multiple series