Sets the opacity to use when drawing using the fill color or fill texture

# ImagickDraw::setFillAlpha

(PECL imagick 2, PECL imagick 3)

ImagickDraw::setFillAlpha — Sets the opacity to use when drawing using the fill color or fill texture

### 说明

public function ImagickDraw::setFillAlpha(float `$alpha`): bool
警告

本函数还未编写文档，仅有参数列表。

Sets the opacity to use when drawing using the fill color or fill texture. Fully opaque is 1.0.

### 参数

`alpha`

  fill alpha

### 返回值

没有返回值。

### 示例

示例 #1 ImagickDraw::setFillAlpha() example

    <?php
    function setFillAlpha($strokeColor, $fillColor, $backgroundColor) {

        $draw = new \ImagickDraw();

        $draw->setStrokeColor($strokeColor);
        $draw->setFillColor($fillColor);
        $draw->setStrokeOpacity(1);
        $draw->setStrokeWidth(2);
        $draw->rectangle(100, 200, 200, 300);
        @$draw->setFillAlpha(0.4);
        $draw->rectangle(300, 200, 400, 300);

        $imagick = new \Imagick();
        $imagick->newImage(500, 500, $backgroundColor);
        $imagick->setImageFormat("png");
        $imagick->drawImage($draw);

        header("Content-Type: image/png");
        echo $imagick->getImageBlob();
    }

    ?>

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