ImagickDraw::setTextUnderColor

(PECL imagick 2, PECL imagick 3)

ImagickDraw::setTextUnderColor — Specifies the color of a background rectangle

说明

public ImagickDraw::setTextUnderColor(ImagickPixel $under_color): bool

警告

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。

示例

示例 #1 ImagickDraw::setTextUnderColor() example

<?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();
}

?>

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www dot query at gmail dot com ¶

13 years ago

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.