ImagickDraw::setTextUnderColor()

(PECL imagick 2.0.0)

Specifies the color of a background rectangle

说明

ImagickDraw::setTextUnderColor(ImagickPixel$under_color): bool

Warning

本函数还未编写文档，仅有参数列表。

Specifies the color of a background rectangle to place under text annotations.

参数

$under_color

the under color

返回值

没有返回值。

范例

Example #1 ImagickDraw::setTextUnderColor()

<?php
function setTextUnderColor($strokeColor, $fillColor, $backgroundColor, $textUnderColor) {
    $draw = new \ImagickDraw();
    $draw->setStrokeColor($strokeColor);
    $draw->setFillColor($fillColor);
    $draw->setStrokeWidth(2);
    $draw->setFontSize(72);
    $draw->annotation(50, 75, "Lorem Ipsum!");
    $draw->setTextUnderColor($textUnderColor);
    $draw->annotation(50, 175, "Lorem Ipsum!");
    $imagick = new \Imagick();
    $imagick->newImage(500, 500, $backgroundColor);
    $imagick->setImageFormat("png");
    $imagick->drawImage($draw);
    header("Content-Type: image/png");
    echo $imagick->getImageBlob();
}
?>

When wishing to print some text on a photograph and make that text sufficiently contrasting to the background image, use a 4 byte code for colour and transparency.
It is the same 4 byte code using by the parameter '-undercolor' in ImageMagick's command lime instruction 'convert'.
The first 3 bytes are the RGB colour code and the fourth byte is the transparency byte.
<?php
  $draw = new ImagickDraw();
  $draw->setFillColor('#ffff00');
  $draw->setFont('Eurostile');
  $draw->setFontSize(21);
  $draw->setTextUnderColor('#ff000088');
  $picin->annotateImage($draw,40,$height-10,0,"Hallo");
?>
The example code produces yellow text on a semi-transparent red background.