用Flash图形化数据(二)

??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。

// 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();

?>

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