用Flash图形化数据(二)

  让我们烤点甜饼(做饼图)

  成功地安装了PHP地Shockwave Flash支持后,就可以用PHP创建Shockwave文件了。学习的最好方法就是直接跳到程序去,所以下面就让我们看看程序。第一个文件包括怎样使用类的示例代码,同时也显示了如何将一个Flash文件嵌入到HTML文档中。

  <?php

  // include class needed for flash graph

  include("class.pie.flash.php");

  mysql_connect ("localhost", "root", "");

  $query = "SELECT DISTINCT city_name, COUNT(city_id)

  FROM city

  GROUP BY city_name;";

  $result = mysql_db_query ("hermes",$query);

  while ($row = mysql_fetch_array ($result)) {

  $city_counts[] = $row["COUNT(city_id)"];

  $city_names[] = $row["city_name"];

  }

  mysql_free_result ($result);

  // Instantiate new object

  $graph = new flash_pie($city_counts, "city.swf");

  // set graph title (should not exceed about 25 characters)

  $graph->pie_title("City Results", 30);

  // set graph legend

  $graph->pie_legend($city_names);

  // show graph

  $graph->show();

  // free resources

  $graph->close();

  ?>

  <html>

  <head>

  <meta http=equiv="Expires" content="Fri, Jun 12 1981 08:20:00 GMT">

  <meta http=equiv="Pragma" content="no-cache">

  <meta http=equiv="Cache-Control" content="no-cache">

  <meta http=equiv="Content-Type" content="text/html; charset=iso-8859-1">

  </head>

  <body bgcolor=white>

  <div align=center>

  <embed src="city.swf" quality=high loop=false pluginspage="http://www.macromedia.com/

  shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash"

  type="application/x-shockwave-flash" width=600 height=300></embed>

  </div>

  </body>

  </html>

  <?php

  class flash_pie {

  // class variables

  // setup some global colors

  var $r_arr = array(0.1,  1, 0, 1, 0, 1, 0.388235294, 0.4, 0.388235294, 0.929411765);

  var $g_arr = array(1,    0, 0, 1, 1, 0, 0.8,         0.4, 0.8,         0.439215686);

  var $b_arr = array(0.25, 0, 1, 0, 1, 1, 1,           0.4, 1,           0.043137255);

  var $percents;

  function flash_pie($values, $this_file) { //begin constructor

  // to write out code directly to browser, set content header and use "php://stdout"

  //swf_openfile ("php://stdout", 700, 250, 30, 1, 1, 1);

  //header("Content-type: application/x-shockwave-flash");

  swf_openfile ($this_file, 1000, 450, 30, 1, 1, 1);

  // set up viewport for flash movie

  swf_ortho2 (-400, 300 , -90, 250);

  // choose the font we will use for pie graph

  swf_definefont(10, "Mod");

  // get sum of array for percents/slices

  while(list($key,$val) = each($values)) {

  $sum = $sum + $val;

  }

  for ($i=0; $i<count($values); $i++) {

  // calculate how big they need to be and then

  // draw all of our slices

  if ($i == 0) {

  // setup parameters for first slice

  $begin = 0;

  $val = $values[$i]/$sum;

  $end = $val*360;

  swf_translate(-200, 0, 0);

  } else {

  // setup parameters for every other slice

  $begin = $end;

  $val = $values[$i]/$sum;

  $end = $end + $val*360;

  }

  // function call to add slice

  $objID = 1+$i*10;

  $this->show_slice($i, $objID, $begin, $end);

  // put together percent array for all labels

  $this->percents[$i] = round($values[$i]/$sum*100);

  }

  }  //end flash_pie

  function show_slice($i, $objID, $begin, $end) {

  // draws a slice and places it in our frame

  swf_addcolor($this->r_arr[$i], $this->g_arr[$i], $this->b_arr[$i], 1);

  swf_startshape($objID);

  swf_shapefillsolid(0, 0, 0, 1);

  swf_shapearc(0, 0, 100, $begin, $end);

  swf_shapecurveto(0, 0, 0, 0);

  swf_endshape($objID);

  swf_pushmatrix();

  swf_placeobject($objID, 1);

  swf_popmatrix();

  swf_showframe();

  }

  function pie_legend($labels) {

  // draws the legend and labels and places it in our frame

  for ($i=0; $i<count($labels); $i++) {

  swf_addcolor($this->r_arr[$i], $this->g_arr[$i], $this->b_arr[$i], 1);

  swf_definerect($i+1000, 1, 0, 20, 20, 0);

  if ($i == 0) {

  swf_translate(120, 75, 0);

  } else {

  swf_translate(0, 20, 0);

  }

  swf_placeobject($i+1000, 1);

  swf_translate(0, 5, 0);

  unset($label);

  $label = $labels[$i];

  $label .= " (";

  $label .= $this->percents[$i];

  $label .= " percent)";

  if ($i==0) {

  $width = (swf_textwidth($label)/4)+30;

  } else {

  $width = round(swf_textwidth($label)/2)+30;

  }

  $this->pie_text($i-1000, "$label", 15, $width, 0);

  swf_translate(-$width, 0, 0);

  }

  swf_translate($width, 30*count($labels), 0);

  }

  function pie_text($id, $text, $size, $x, $y) {

  // simple function to draw text ($text) at ($x,$y) with font size ($size)

  // set color of text to black

  swf_addcolor(0,0,0,0);

  // set font size and slant

  swf_fontsize($size);

  swf_fontslant(0);

  // define, position and place text in frame

  swf_definetext($id, "$text", 1);

  swf_translate($x, $y, 0);

  swf_placeobject($id, 1);

  }

  function pie_title($text, $size) {

  // simple function to draw title and set lineup

  // $text should not exceed about 25 characters

  $this->pie_text(99, $text, $size, 0, 150);

  swf_translate(0, -300, 0);

  }

  function show() {

  // show the frame

  swf_showframe();

  }

  function close() {

  // flush our buffer and return movie

  $data = swf_closefile(1);

  }

  } // end class flash_pie

  ?>

  注意,你可以将生成的SWF文件直接返回到浏览器中,而不必一定要像我一样把它写到一个文件中。这可能对测试来说是有用的,但你可能很少用到一个Flash文件,更多的时候你可能想把Flash文件嵌入到HTML文档中。如果你选择直接把Flash文件输出到浏览器中,你可以如下设置header content 类型:

  header("Content-type: application/x-shockwave-flash")

  并把swf_openfile(filename",...)改成swf_openfile("php://stdout",...)

  更多信息的链接:

  http://www.php.net/manual/ref.swf.php  关于swf_* PHP函数的说明

  http://reality.sgi.com/grafica/flash/  下载PHP的swf库

  http://openswf.org                     更多Flash工具和信息

  http://www.macromedia.com/software/flash/open/licensing/

  关于Macromedia Flash SDK的更多信息