imagefilledellipse()

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

画一椭圆并填充

说明

画一椭圆并填充到指定的$image。

参数

由图象创建函数(例如imagecreatetruecolor())返回的图象资源。

中央的 x 坐标。

中央的 y 坐标。

椭圆的宽度。

椭圆的高度。

要填充的颜色。颜色标识由函数imagecolorallocate()创建。

返回值

成功时返回TRUE，或者在失败时返回FALSE。

范例

imagefilledellipse()例子

以上例程的输出类似于：

注释

Note:此函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。

参见

• imageellipse()画一个椭圆
• imagefilledarc()画一椭圆弧且填充

Here is a piece of code using imagefilledellipse which creates a simulation of the current phase of the moon...
Usage is  which produces an image 100px by 100px wide. If size is left out, the default is 24px by 24px. 

This draws an anti-aliased circle with an optional border. Call with  to draw a filled circle with radius=50, foreground color=red, background color=black, border width=5, and border color=yellow. Assumes register_globals is on, but you can fix that easily. 

draws a gradient filled ellipse with alpha color support based on felixbruns at web dot de imagegradientellipse function. thx felixbruns :o)
function imagegradientellipsealpha($image, $cx, $cy, $w, $h, $ic, $oc){
    $w = abs($w);
    $h = abs($h);
    $oc = array(0xFF & ($oc >> 0x10), 0xFF & ($oc >> 0x8), 0xFF & $oc);
    $ic = array(0xFF & ($ic >> 0x10), 0xFF & ($ic >> 0x8), 0xFF & $ic);
    $c0 = ($oc[0] - $ic[0]) / $w;
    $c1 = ($oc[1] - $ic[1]) / $w;
    $c2 = ($oc[2] - $ic[2]) / $w;
    $ot = $oc >> 24;
    $it = $ic >> 24;
    $ct = ($ot - $it) / $w;
    $i = 0;
    $j = 0;
    $is = ($w= $h){
        break;
      }
    }
  }

I quickly made a gradient ellipse function (i took some code from other gradient functions). It works like imageellipse or imagefilledellipse but with two color parameters: $ic is the inner color of the gradient ellipse and $oc is the outer color. 

This is a niffty function that you can use to make transparent ellipse/round type cutouts of any PNG or GIF image. The hard part is finding what color to use for the cutout layer and then the transparent layer, because you don't want to set the transparent index to a color being used in the image. After that it's as simple as layering the two images together.
what you need for the example...
a image of the size you want the cutout to be, gif or png (true color /256) can be used!

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