PHP图片处理（Imagick类）

1、画布创建

$im = new \Imagick($bjimage); //从图片创建画布

$srcWH = $im->getImageGeometry();     //获取画布尺寸

 $canvas = new \Imagick(); 

//画布空白画布

$canvas->newImage( $srcWH['width'], $srcWH['height'], 'white', 'png' );

2.图片缩放

$im->thumbnailImage($srcWH['width'],$srcWH['height'],false);

//指定图片类型格式化

$sharebg->setImageFormat( "jpg" );

3.把sharebg图片贴到im图片上

$im->compositeImage($sharebg,\Imagick::COMPOSITE_OVER,0,0);

4. 头像avatar切成圆形

$avatar=new\Imagick($info['avatar']);

// example values

    $width = 87;

    $height = 87;

// create mask image

    $mask = new Imagick();

    $mask->newImage($width, $height, new ImagickPixel('transparent'), 'png');

// create the rounded rectangle

    $shape = new ImagickDraw();

    $shape->setFillColor(new ImagickPixel('white'));

    $shape->roundRectangle(0, 0, $width, $height, ($width/2)+1, ($height/2)+1);

// draw the rectangle

    $mask->drawImage($shape);

// apply mask

    $avatar->compositeImage($mask, Imagick::COMPOSITE_DSTIN, 0, 0);

    5.加文字

    $draw   = new \ImagickDraw();

    $draw->setFontSize(27);//设置字体大小

    $draw->setFillColor('#F6970B');//设置字体颜色

    $draw->setFontWeight  ( 800 );

    $draw->setFont('assets/fonts/msyh.ttf');

    $draw->setTextEncoding('UTF-8');

    $canvas->annotateImage($draw, 196, 74, 0,  subTextLength($info['nickname'],8));