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