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PHP histogram generation code (imagefilledrectugle function example)

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2016-07-25 08:55:301101browse
  1. /**

  2. * php histogram imagefilledrectugle function use case
  3. * by bbs.it-home.org
  4. */
  5. function createImage($data,$twidth,$tspace,$height){
  6. header("Content-Type:image/ jpeg");
  7. $dataname = array();
  8. $datavalue = array();//The value in data
  9. $i = 0;
  10. $j = 0;
  11. $k = 0;
  12. $num = sizeof( $data);

  13. foreach($data as $key => $val){

  14. $dataname[] = $key;
  15. $datavalue[] = $val;
  16. }< /p>
  17. $width = $num * ($twidth + $tspace) + 20 ;//Get the width of the image

  18. $im = imagecreate($width,$height);//Create image
  19. $bgcolor = imagecolorallocate($im,255,255,255);//Background color

  20. $jcolor = imagecolorallocate($im,255,255,0);//Background color of the rectangle
  21. $acolor = imagecolorallocate($im ,0,0,0);//The color of the line

  22. imageline($im,25,$height-20,$width-5,$height -20,$acolor);/ /X-axis

  23. imageline($im,25,$height-20,25,2,$acolor);//Y-axis
  24. while($i< $num){
  25. imagefilledrectangle($im,$i*($tspace+ $twidth)+40,$height-$datavalue[$i]-20,$i*($twidth+$tspace)+$tspace+40,$height-20,$jcolor);//Draw a rectangle
  26. imagestring($ im,3,$i*($tspace+$twidth)+40+$twidth/2,$height-$datavalue[$i]-35,$datavalue[$i],$acolor);//Write on the pillar Output value
  27. imagestring($im,3,$i*($tspace+$twidth)+40+$twidth/2,$height-15,$dataname[$i],$acolor);//Write it below the column Value
  28. $i ++;

  29. }

  30. while($j < 400/10){
  31. imageline($im,25,($height-20)-$j*8, 28,($height-20)-$j*8,$acolor);//Draw the scale
  32. imagestring($im,2,5,($height-30)-$j*8,$j*10, $acolor);//Mark the scale value
  33. $j = $j +10;
  34. }
  35. imagejpeg($im);
  36. }
  37. $data =array("1"=>25,"2"=> 30,"3" =>21 );
  38. createImage($data,40,40,300);
  39. ?>

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