Hey, this is a great function that I spent a lot of time looking for.
What is it great for? Fading. It gives you the ability to fade any supported object (including images) totally or even specific color channels.
The project I am working on requires a series of images and backgrounds to fade into each other. As a bit of a noob, I found the doc here and it's example a little confusing.
I thought that to provide a value for a color channel would change it, but it doesn't.
To say, just change the alpha channel value, you can write it like this
<?php
$movie=new SWFMovie();
$movie->setDimension(700,150);
$movie->setBackground(0,255,255);
// image to add to movie
$img="images/example.jpg";
// add it image to movie and fade its alpha channel
$png = new SWFBitmap(fopen($img,"rb"));
$f1 = $movie->add($png);
$f1->multColor(1,1,1,0.5);
?>
This code will load the image and give it s 50% transperancy.
Similarly, one can fade a single color channel by reducing the value for that specific channel.
<?php
$ft->multColor(0.5,1,1);
?>
This makes the red channel (remember rgb) 50% transparent. You can put a 0 there to completely remove the red channel.
Hope this helps any fellow noobs trying to figure out ming out there.
SWFDisplayItem::multColor
(PHP 5 < 5.3.0, PECL ming SVN)
SWFDisplayItem::multColor — Multiplies the item's color transform
说明
SWFDisplayItem::multColor
( float
$red
, float $green
, float $blue
[, float $a
] ) : voidWarning
此函数是实验性的。此函数的表象，包括名称及其相关文档都可能在未来的 PHP 发布版本中未通知就被修改。使用本函数风险自担。
swfdisplayitem::multcolor() multiplies the item's color transform by the given values.
The object may be a swfshape(), a swfbutton(), a swftext() or a swfsprite() object. It must have been added using the swfmovie::add().
参数
These parameters are floats between 0.0 and 1.0:
-
red -
Value of red component
-
green -
Value of green component
-
blue -
Value of blue component
-
a -
Value of alpha component
返回值
没有返回值。
范例
This simple example will modify your picture's atmosphere to Halloween (use a landscape or bright picture).
Example #1 swfdisplayitem::multcolor() example
<?php
$b = new SWFBitmap(file_get_contents("backyard.jpg"));
// note use your own picture :-)
$s = new SWFShape();
$s->setRightFill($s->addFill($b));
$s->drawLine($b->getWidth(), 0);
$s->drawLine(0, $b->getHeight());
$s->drawLine(-$b->getWidth(), 0);
$s->drawLine(0, -$b->getHeight());
$m = new SWFMovie();
$m->setDimension($b->getWidth(), $b->getHeight());
$i = $m->add($s);
for ($n=0; $n<=20; ++$n) {
$i->multColor(1.0-$n/10, 1.0, 1.0);
$i->addColor(0xff*$n/20, 0, 0);
$m->nextFrame();
}
header('Content-type: application/x-shockwave-flash');
$m->output();
?>
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Anonymous ¶
15 years ago
