class wordsOnImg {

/**

* a.合成图片信息 复制一张图片的矩形区域到另一张图片的矩形区域

* @param [type] $bg_image [目标图]

* @param [type] $sub_image [被添加图]

* @param [type] $add_x [目标图x坐标位置]

* @param [type] $add_y [目标图y坐标位置]

* @param [type] $add_w [目标图宽度区域]

* @param [type] $add_h [目标图高度区域]

* @param [type] $out_image [输出图路径]

* @return [type] [description]

*/

public

function image_copy_image($bg_image, $sub_image, $add_x, $add_y, $add_w, $add_h, $out_image) {

if ($sub_image) {

$bg_image_c = imagecreatefromstring(file_get_contents($bg_image));

$sub_image_c = imagecreatefromstring(file_get_contents($sub_image));

imagecopyresampled($bg_image_c, $sub_image_c, $add_x, $add_y, 0, 0, $add_w, $add_h, imagesx($sub_image_c), imagesy($sub_image_c));

//保存到out_image

imagejpeg($bg_image_c, $out_image, 80);

imagedestroy($sub_image_c);

imagedestroy($bg_image_c);

}

}

/**

* b.生成文字图片并插入广告图中

* @param [type] $filename [生成的图片]

* @param [type] $bg_image [背景图片展览]

* @param [add_x]$add_x [文字增长的位置x轴]

* @param [add_y]$add_y [文字增长的位置y轴]

* @param [type] $text [文字内容]

* @param [type] $font [文字大小]

* @param [type] $size [文字画布的宽]

* @param [type] $red [红]

* @param [type] $grn [绿]

* @param [type] $blu [蓝]

*/

public

function create_text($bg_image, $add_x, $add_y, $filename, $text, $font, $size, $red, $grn, $blu) {

$rot = 0; // 旋转角度

$width = 0; //宽度

$height = 0; //高度

$offset_x = 0; //x偏移

$offset_y = 0; //y偏移

$bounds = array();

//$text = autowrap($size, 0, $font, $text,$width_f); // 自动换行处理

/** [字体大小] [角度] [字体名称] [字符串] [预设宽度] */

// 肯定边框高度.

$bounds = ImageTTFBBox($size, $rot, $font, "W");

if ($rot < 0) {

$font_height = abs($bounds[7] - $bounds[1]);

} else if ($rot > 0) {

$font_height = abs($bounds[1] - $bounds[7]);

} else {

$font_height = abs($bounds[7] - $bounds[1]);

}

// 肯定边框高度.

$bounds = ImageTTFBBox($size, $rot, $font, $text);

if ($rot < 0) {

$width = abs($bounds[4] - $bounds[0]);

$height = abs($bounds[3] - $bounds[7]);

$offset_y = $font_height;

$offset_x = 0;

} else if ($rot > 0) {

$width = abs($bounds[2] - $bounds[6]);

$height = abs($bounds[1] - $bounds[5]);

$offset_y = abs($bounds[7] - $bounds[5]) + $font_height;

$offset_x = abs($bounds[0] - $bounds[6]);

} else {

$width = abs($bounds[4] - $bounds[6]);

$height = abs($bounds[7] - $bounds[1]);

$offset_y = $font_height;

$offset_x = 0;

}

$bg = imagecreatetruecolor($width + 20, $height + 20); // 建立画布

$color = imagecolorallocatealpha($bg, 0, 0, 0, 127); //拾取一个彻底透明的颜色

imagealphablending($bg, false); //关闭混合模式，以便透明颜色能覆盖原画布

imagefill($bg, 0, 0, $color); //填充

imagesavealpha($bg, true); //设置保存PNG时保留透明通道信息

$textImg = imagecolorallocate($bg, $red, $grn, $blu); // 建立白色

ImageTTFText($bg, $size, 0, 10, $size + 10, $textImg, $font, $text);

imagepng($bg, $filename);

//生成的文字图片添加到图片里

$add_x = $add_x;

$add_y = $add_y;

$add_w = $width + 20;

$add_h = $height + 20;

$this - >image_copy_image($bg_image, $filename, $add_x, $add_y, $add_w, $add_h, $filename);

return $filename;

}

/**

* 文字自动换行

* @param [type] $fontsize [字体大小]

* @param [type] $angle [角度]

* @param [type] $fontface [字体名称]

* @param [type] $string [字符串]

* @param [type] $width [预设宽度]

*/

public

function autowrap($fontsize, $angle, $fontface, $string, $width) {

$content = "";

// 将字符串拆分红一个个单字 保存到数组 letter 中

preg_match_all("/./u", $string, $arr);

$letter = $arr[0];

foreach($letter as $l) {

$teststr = $content." ".$l;

$testbox = imagettfbbox($fontsize, $angle, $fontface, $teststr);

// 判断拼接后的字符串是否超过预设的宽度

if (($testbox[2] > $width) && ($content !== "")) {

$content. = PHP_EOL;

}

$content. = $l;

}

return $content;

}

}

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