In PHP, use GD to draw a pie chart and gd to draw a pie _ PHP Tutorial

Use GD to draw a pie chart and gd to draw a pie chart. Use GD to draw a pie chart in PHP and gd to draw a pie chart in PHP. for the class to be drawn, see the code: 1 ClassChart {2 private $ image; define image 3 private $ title; define Title 4 priv PHP use GD to draw a pie chart and gd to draw a pie chart

Use GD to draw a pie chart in PHP. for the class to be drawn, see the code:

1 Class Chart {2 private $ image; // defines the image 3 private $ title; // defines the title 4 private $ ydata; // defines the y axis data 5 private $ xdata; // define the x-axis data 6 private $ color; // define the bar chart color 7 private $ bgcolor; // define the image background color 8 private $ width; // define the image width 9 private $ height; // define the image length 10 11/* 12 * constructor 13 * String title image title 14 * Array xdata index Array, X axis data 15 * Array ydata index Array, number Array, Y axis data 16 */17 function _ construct ($ title, $ xdata, $ ydata) {18 $ t His-> title = $ title; 19 $ this-> xdata = $ xdata; 20 $ this-> ydata = $ ydata; 21 $ this-> color = array ('#058DC7', '#50B432', '# ED561B', '# DDDF00', '#24CBE5', '#64E572 ', '# ff9655',' # FFF263 ',' #6AF9C4 '); 22} 23 24/* 25 * public method, set the bar chart color 26 * Array color Array, the element value is '# 058dc7' in this form 27 */28 function setBarColor ($ color) {29 $ this-> color = $ color; 30} 31 32/* 33 * create a pie chart 34 */35 function mkPieChart () {36 $ sum = Array_sum ($ this-> ydata); // Obtain the sum of all ydata elements 37 $ start = 0; // arc start angle 38 $ end = 0; // arc end angle 39 $ pieWidth = 300; // The long axis of the elliptic 40 $ pieHeight = 220; // the short axis of the elliptic 41 $ space = 40; // The distance between the ellipse and the small rectangle is 42 $ margin = 20; // The margin of the image is 43 $ recWidth = 20; // The width of the small rectangle is 44 $ recHeight = 15; // the height of the small rectangle is 45 $ titleHeight = 50; // Title area height 46 // Image adaptive width and height 47 $ this-> width = $ pieWidth + $ this-> arrayLengthMax ($ this-> xdata) * 10*4/3 + $ space + $ recW Idth + $ margin; 48 $ this-> height = ($ pieHeight> count ($ this-> xdata) * 25 )? $ PieHeight: count ($ this-> xdata) * 25) + $ titleHeight; 49 // coordinates of the elliptical center 50 $ cx = $ pieWidth/2 + $ margin; 51 $ cy = $ pieHeight/2 + $ titleHeight; 52 53 $ this-> image = imagecreatetruecolor ($ this-> width, $ this-> height ); // prepare the canvas 54 $ this-> bgcolor = imagecolorallocate ($ this-> image, 255,255,255); // The background color of the image 55 imagefill ($ this-> image, $ this-> bgcolor); // fill in the background 56 57 // set the bar chart color 58 $ color = array (); 59 foreach ($ this -> Color as $ col) {60 $ col = substr ($ col, 1, strlen ($ col)-1); 61 $ red = hexdec (substr ($ col, ); 62 $ green = hexdec (substr ($ col,); 63 $ blue = hexdec (substr ($ col )); 64 $ color [] = imagecolorallocate ($ this-> image, $ red, $ green, $ blue ); 65} 66 67 // set the line segment color, font color, and font path 68 $ lineColor = imagecolorallocate ($ this-> image, 0xcc, 0xcc, 0xcc ); 69 $ fontColor = imagecolorallocate ($ this-> image, 0x95, 0x8f, 0 X8f); 70 $ fontPath = 'font/simsun. ttc '; 71 72 // draw the slice arc 73 for ($ I = 0; $ I <10; $ I ++) {74 foreach ($ this-> ydata as $ key => $ val) {75 $ end + = 360 * $ val/$ sum; 76 imagefilledarc ($ this-> image, $ cx, $ cy-$ I, $ pieWidth, $ pieHeight, $ start, $ end, $ color [$ key % count ($ this-> color)], IMG_ARC_PIE ); 77 $ start = $ end; 78} 79} 80 81 // draw a small rectangle and text description 82 $ x1 = $ pieWidth + $ space; 83 $ y1 = $ titleHeight; 84 foreach ($ this-> yd Ata as $ key => $ val) {85 imagefilledrectangle ($ this-> image, $ x1, $ y1, $ x1 + $ recWidth, $ y1 + $ recHeight, $ color [$ key % count ($ this-> color)]); 86 imagettftext ($ this-> image, 10, 0, $ x1 + $ recWidth + 5, $ y1 + $ recHeight-2, $ fontColor, $ fontPath, $ this-> xdata [$ key]); 87 $ y1 + = $ recHeight + 10; 88} 89 90 // painting title 91 $ titleStart = ($ this-> width-5.5 * strlen ($ this-> title)/2; 92 imagettftext ($ this-> image, 11,0, $ titleStart, 20, $ f OntColor, $ fontPath, $ this-> title); 93 94 // output image 95 header ("Content-Type: image/png "); 96 imagepng ($ this-> image); 97} 98 99/* 100 * Private method, evaluate the maximum element length value in the Array: 101 * Array arr string Array, must be a Chinese character 102 */103 private function arrayLengthMax ($ arr) {104 $ length = 0; 105 foreach ($ arr as $ val) {106 $ length = strlen ($ val)> $ length? Strlen ($ val): $ length; 107} 108 return $ length/3; 109} 110 111 // destructor 112 function _ destruct () {113 imagedestroy ($ this-> image); 114} 115}

The test code is as follows:

1 $ xdata = array ('test 1', 'Test 2', 'Test 3', 'Test 4', 'Test 5', 'Test 6 ', 'test 7', 'Test 8', 'Test 9'); 2 $ ydata = array (89,90, 90,23, 35,45, 56,23, 56 ); 3 $ Img = new Chart ($ title, $ xdata, $ ydata); 4 $ Img-> mkPieChart ();

As follows:

Use GD in PHP to draw a pie Chart. for the Class to be drawn, see the code: 1 Class Chart {2 private $ image; // define image 3 private $ title; // define the title 4 priv...