在线编辑二维码并发送到热敏打印机打印

php中文网

发布时间：2016-07-25 08:46:27

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来源于php中文网

原创

在线编辑

使用到的 js 插件：

qrcodesvg

根据信息绘制二维码插件 colorPicker

用于颜色选择，js绑定事件更改二维码（svg）的颜色 canvg

用于将svg格式的二维码转换成 html5 的 canvas ，之后使用 toDataURL 方法生成二维码图片的 base64 编码数据，通过 Ajax 发送给后端热敏打印机打印二维码

图片要转成BMP格式。转换图片到BMP的类：

/**
* class jpg, gif, png =========> BMP
*
* { Description :-
* class that resize and convert jpg, gif or png to bmp
* }
* for more info contact with me (mahabub1212@yahoo.com)
* you can modify or use or redistribute this class.
*/
class ToBmp{
// new image width
var $new_width;
// new image height
var $new_height;
// image resources
var $image_resource;
function image_info($source_image){
$img_info = getimagesize($source_image);
switch ($img_info['mime']){
case "image/jpeg": { $this->image_resource = imagecreatefromjpeg ($source_image); break; }
case "image/gif": { $this->image_resource = imagecreatefromgif ($source_image); break; }
case "image/png": { $this->image_resource = imagecreatefrompng ($source_image); break; }
default: {die("图片错误");}
}
}
public function imagebmp($file_path = ''){
if(!$this->image_resource) die("图片错误");
$picture_width = imagesx($this->image_resource);
$picture_height = imagesy($this->image_resource);
if(!imageistruecolor($this->image_resource)){
$tmp_img_reource = imagecreatetruecolor($picture_width,$picture_height);
imagecopy($tmp_img_reource,$this->image_resource, 0, 0, 0, 0, $picture_width, $picture_height);
imagedestroy($this->image_resource);
$this->image_resource = $tmp_img_reource;
}
if((int) $this->new_width >0 && (int) $this->new_height > 0){
$image_resized = imagecreatetruecolor($this->new_width, $this->new_height);
imagecopyresampled($image_resized,$this->image_resource,0,0,0,0,$this->new_width,$this->new_height,$picture_width,$picture_height);
imagedestroy($this->image_resource);
$this->image_resource = $image_resized;
}
$result = '';
$biBPLine = ((int) $this->new_width >0 &&(int)$this->new_height > 0) ? $this->new_width * 3 : $picture_width * 3;
$biStride = ($biBPLine + 3) & ~3;
$biSizeImage = ((int) $this->new_width >0 &&(int)$this->new_height > 0) ? $biStride * $this->new_height : $biStride * $picture_height;
$bfOffBits = 54;
$bfSize = $bfOffBits + $biSizeImage;
$result .= substr('BM', 0, 2);
$result .= pack ('VvvV', $bfSize, 0, 0, $bfOffBits);
$result .= ((int) $this->new_width >0 &&(int)$this->new_height > 0) ? pack ('VVVvvVVVVVV', 40, $this->new_width, $this->new_height, 1, 24, 0, $biSizeImage, 0, 0, 0, 0) : pack ('VVVvvVVVVVV', 40, $picture_width, $picture_height, 1, 24, 0, $biSizeImage, 0, 0, 0, 0);
$numpad = $biStride - $biBPLine;
$h = ((int) $this->new_width >0 &&(int)$this->new_height > 0) ? $this->new_height : $picture_height;
$w = ((int) $this->new_width >0 &&(int)$this->new_height > 0) ? $this->new_width : $picture_width;
for ($y = $h - 1; $y >= 0; --$y) {
for ($x = 0; $x $col = imagecolorat ($this->image_resource, $x, $y);
$result .= substr(pack ('V', $col), 0, 3);
}
for ($i = 0; $i $result .= pack ('C', 0);
}
}
if($file_path == ''){
header("Content-type: image/bmp");
echo $result;
} else {
$fp = fopen($file_path,"wb");
fwrite($fp,$result);
fclose($fp);
//=============
}
return ;
}
}