简体中文（ZH-CN）English（EN）繁体中文（ZH-TW）日本語（JA）한국어（KO）
Home
Article
Q&A
Course
Topic
Download
Game
Dictionary

Home  >  Article  >  Backend Development  >  PHP code example for drawing pie chart

PHP code example for drawing pie chart

WBOY
WBOYOriginal
2016-07-25 08:59:061342browse
  2. //Variable definition, the angle size when drawing an elliptical arc
  3. define("ANGLELENGTH",3);
  4. /**
  5. * Draw the picture
  6. * @param $title The title of the 3D picture
  7. * @param $dataArr The displayed data array
  8. * @param $labelArr The label classification array corresponding to the data
  9. * @param $colorArr The array corresponding to the drawing color
  10. * @ param $a The base width of the canvas
  11. * @param $b The base height of the canvas
  12. * @param $v The height of the 3D column
  13. * @param $font The font size
  14. * @return The image access path for successful drawing
  15. */
  16. function drawPieImg($title, $dataArr , $labelArr, $colorArr, $a=250, $b=120, $v=20, $font=10){
  17. $ox = 5+$a;
  18. $oy = 5+$b;
  19. $fw = imagefontwidth($font);
  20. $fh = imagefontheight($font);
  21. $n = count($dataArr);//Calculate the array length
  22. $w = 10+$a*2;
  23. $h = 10+$b *2+$v+($fh+2)*$n;
  24. //Create artboard
  25. $img = imagecreate($w, $h);
  26. //Convert RGB to index color
  27. for($i=0; $ i<$n; $i++)
  28. $colorArr[$i] = drawIndexColor($img,$colorArr[$i]);//Assign color to image $img
  29. $clrbk = imagecolorallocate($img, 0xff, 0xff, 0xff);
  30. $clrt = imagecolorallocate($img, 0x00, 0x00, 0x00);
  31. //Fill the background color
  32. imagefill($img, 0, 0, $clrbk);
  33. //Sum
  34. $tot = 0;
  35. for($i=0; $i<$n; $i++)
  36. $tot += $dataArr[$i];
  37. //The starting angle size of each category
  38. $sd = 0;
  39. //Every The angle occupied by each category
  40. $ed = 0;
  41. $ly = 10+$b*2+$v;
  42. for($i=0; $i<$n; $i++){
  43. $sd = $ ed;
  44. $ed += $dataArr[$i]/$tot*360;
  45. //Draw 3D sector
  46. draw3DSector($img, $ox, $oy+20, $a, $b, $v, $sd , $ed, $colorArr[$i]);
  47. //Draw label
  48. imagefilledrectangle($img, 5, $ly, 5+$fw, $ly+$fh, $colorArr[$i]);
  49. imagerectangle($ img, 5, $ly, 5+$fw, $ly+$fh, $clrt);
  50. //Chinese transcoding
  51. $str = iconv("GB2312", "UTF-8", $labelArr[$i]) ;
  52. imagettftext($img, $font, 0, 5+2*$fw, $ly+13, $clrt, "D:/wamp/www/source/font/simhei.ttf", $str.":" .$dataArr[$i]."(".(round(10000*($dataArr[$i]/$tot))/100)."%)");
  53. $ly += $fh+2;
  54. }
  55. //Draw the picture title
  56. imagettftext($img, 15, 0, 5, 15, $clrt, "D:/wamp/www/source/font/simhei.ttf", iconv("GB2312", "UTF- 8",$title));
  57. //Output graphics
  58. header("Content-type: image/png");
  59. //Output the generated image
  60. $imgFileName = "./".time().".png ";
  61. imagepng($img,$imgFileName);
  62. return $imgFileName;
  63. }
  64. /**
  65. * Draw 3d sector
  66. */
  67. function draw3DSector($img, $ox, $oy, $a, $b, $v, $sd, $ed, $clr) {
  68. drawSector($img, $ox, $oy, $a, $b, $sd, $ed, $clr);
  69. if($sd<180){
  70. list( $red, $green, $blue) = drawDarkColor($img, $clr);
  71. //Assign color to the image
  72. $clr=imagecolorallocate($img, $red, $green, $blue);
  73. if($ed> ;180)
  74. $ed = 180;
  75. list($sx, $sy) = getExy($a,$b,$sd);
  76. $sx += $ox;
  77. $sy += $oy;
  78. list( $ex, $ey) = getExy($a, $b, $ed);
  79. $ex += $ox;
  80. $ey += $oy;
  81. imageline($img, $sx, $sy, $sx, $sy+$v, $clr);
  82. imageline($img, $ex, $ey, $ex, $ey+$v, $clr);
  83. drawArc($img, $ox, $oy+$v, $a, $b, $sd, $ed, $clr);
  84. list($sx, $sy) = getExy($a, $b, ($sd+$ed)/2);
  85. $sy += $oy+$v /2;
  86. $sx += $ox;
  87. imagefill($img, $sx, $sy, $clr);
  88. }
  89. }
  90. /**
  91. * Draw elliptical arc
  92. */
  93. function drawArc($img,$ox, $oy,$a,$b,$sd,$ed,$clr){
  94. $n = ANGLELENGTH >0 ? ceil(($ed-$sd)/ANGLELENGTH) : -1;
  95. $d = $sd ;
  96. list($x0,$y0) = getExy($a,$b,$d);
  97. for($i=0; $i<$n; $i++){
  98. $d = ($d+ANGLELENGTH )>$ed?$ed:($d+ANGLELENGTH);
  99. list($x, $y) = getExy($a, $b, $d);
  100. imageline($img, $x0+$ox, $ y0+$oy, $x+$ox, $y+$oy, $clr);
  101. $x0 = $x;
  102. $y0 = $y;
  103. }
  104. }
  105. /**
  106. * Draw a fan
  107. */
  108. function drawSector($ img, $ox, $oy, $a, $b, $sd, $ed, $clr) {
  109. $n = ANGLELENGTH > 0 ? ceil(($ed-$sd)/ANGLELENGTH) : -1;
  110. $d = $sd;
  111. list($x0,$y0) = getExy($a, $b, $d);
  112. imageline($img, $x0+$ox, $y0+$oy, $ox, $oy, $clr);
  113. for($i=0; $i<$n; $i++) {
  114. $d = ($d+ANGLELENGTH)>$ed?$ed:($d+ANGLELENGTH);
  115. list( $x, $y) = getExy($a, $b, $d);
  116. imageline($img, $x0+$ox, $y0+$oy, $x+$ox, $y+$oy, $clr);
  117. $x0 = $x;
  118. $y0 = $y;
  119. }
  120. imageline($img, $x0+$ox, $y0+$oy, $ox, $oy, $clr);
  121. list($x, $y) = getExy($a/2, $b/2, ($d+$sd)/2);
  122. imagefill($img, $x+$ox, $y+$oy, $clr);
  123. }
  124. /**
  125. * Get the shadow color of the corresponding column based on $clr color
  126. * @param $img image
  127. * @param $clr color
  128. * @return rgb color array
  129. */
  130. function drawDarkColor($img,$clr){
  131. $rgb = imagecolorsforindex($img,$clr);
  132. return array($rgb["red"]/2,$rgb["green"]/ 2,$rgb["blue"]/2);
  133. }
  134. /**
  135. * Find the coordinates of the point on the ellipse corresponding to angle $d
  136. *
  137. * @param $a Abscissa coordinate
  138. * @param $b Vertical coordinate
  139. * @param $d Angle
  140. * @return Corresponding ellipse point coordinate
  141. */
  142. function getExy($a, $b, $d){
  143. $d = deg2rad($d);
  144. return array(round($a*cos($d)), round($b*sin($d)));
  145. }
  146. /**
  147. * Assign RGB indexed color to image
  148. */
  149. function drawIndexColor($img, $clr){
  150. $red = ($clr>>16) & 0xff;
  151. $green = ($clr>>8)& 0xff;
  152. $blue = ($clr) & 0xff;
  153. return imagecolorallocate($img, $red, $green, $blue);
  154. }
  155. //Test example
  156. $title = "Zoo Animal Type Distribution";
  157. $dataArr = array(20, 10, 20, 20, 10, 20, 30, 10); //Test data array
  158. $labelArr = array("elephant", "giraffe", "crocodile", "ostrich", "tiger" ", "Lion", "Monkey", "Zebra"); //Tag
  159. $colorArr = array(0x99ff00, 0xff6666, 0x0099ff, 0xff99ff, 0xffff99, 0x99ffff, 0xff3333, 0x009999); //Corresponding color array
  160. $result = drawPieImg($title, $dataArr,$labelArr,$colorArr);
  161. echo "";
  162. ?>
Copy code

Code description: The drawPieImg() function contains 8 parameters. $title is the title of the pie chart; $dataArr is the data array that needs to be displayed; $labelArr is the label classification array of the corresponding data; $colorArr is the drawing color array of the corresponding data. These 4 Parameters are required, just pass the corresponding parameters for different system applications.

The remaining 4 parameters are responsible for setting the size of the pie chart to be generated. If not set, the system default value will be used. The program starts drawing from 0 degrees according to the size of the array data at the bottom of the bed, and draws the sector size occupied by the corresponding data in a clockwise direction.

For those who are interested, please try the above code and see how the pie chart looks like? !



Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Previous article：A php class to connect to mysql databaseNext article：A php class to connect to mysql database

Related articles

See more