Question

我正在尝试实现一个在其他图像上绘制图像的功能。我总是得到第二张图片，上面是黑色背景，这里是我正在使用的代码

function writeImageOnImage($canvasImage, $x, $y, $drawnImage, $multiplyer = 1, $dynamicProperotions = false){
    if(is_resource($canvasImage)){
        $canvasImage = $canvasImage;
    }else{
        $canvasImage = imagecreatefrompng($canvasImage);
    }
    $drawnImageResource = imagecreatefrompng($drawnImage, true);
    $drawnImageResource = $drawnImageResource['image'];
    //imagecolortransparent($drawnImageResource, imagecolorallocate($drawnImageResource, 255, 255, 255));
    if($dynamicProperotions){
        $width = imagesx($drawnImageResource);
        $height = imagesy($drawnImageResource);
        if($multiplyer > 1){
            $width /= $multiplyer;
            $height /= $multiplyer;
        }
    }else{
        $width = 20;
        $height = 20;
    }
    imagealphablending($canvasImage, false);
    imagesavealpha($canvasImage, true);
    //imagecolorallocatealpha($canvasImage, 0, 0, 0, 127);
    imagecopy($canvasImage, $drawnImageResource, $x*$multiplyer, $y*$multiplyer, 0, 0, $width*$multiplyer, $height*$multiplyer);
    imagedestroy($drawnImageResource);
    return $canvasImage;
}

这是我如何调用此函数

writeImageOnImage("test.png", 100, 100, "checkSign.png", 1, true);

＆＃34; checkSign.png＆＃34;是从用户html画布的输出创建的（它提供了svg输出）。我使用Imagick将svg图像转换为png并且代码为：

function createSvgImage($data, $maxWidth, $maxHeight, $fileName){
    global $configuration;
    $result = array();
    $result["file"] = $fileName;
    $data = str_replace("data:image/svg+xml;base64", "", $data);
    $data = str_replace(" ", "+", $data);
    $data = base64_decode($data);
    $data = str_replace('stroke="#000000"', 'stroke="#004fca"', $data);
    $xml = simplexml_load_string($data);
    $attr = $xml->attributes();
    $size = [$maxWidth, $maxHeight];
    $widthRatio = intval($attr->width) / $size[0];
    $heightRatio = intval($attr->height) / $size[1];
    $image = new \Imagick();
    $image->setBackgroundColor(new \ImagickPixel('transparent'));
    if($widthRatio > $heightRatio){
        $image->setResolution(72 * ($size[0] / intval($attr->width)),72*((intval($attr->height)*$widthRatio) / intval($attr->height)));
        $image->readimageblob($data);
        $image->scaleImage($maxWidth,floatval($attr->height)/$widthRatio);
        $result['width'] = $maxWidth;
        $result['height'] = floatval($attr->height)/$widthRatio;
    }else{
        $image->setResolution(72*((intval($attr->width)*$heightRatio) / intval($attr->width)),72 * ($size[1] / intval($attr->height)));
        $image->readimageblob($data);
        $image->scaleImage(floatval($attr->width)/$heightRatio, $maxHeight);
        $result['width'] = floatval($attr->width)/$heightRatio;
        $result['height'] = $maxHeight;
    }
    $image->setimagetype(\Imagick::IMGTYPE_TRUECOLOR);
    $image->setimageformat("png");
    /*$image->setOption('png:color-type', 6);
    $image->setOption('png:bit-depth', 8);*/
    //$image->writeimage("png16:".$fileName);
    $image->writeimage($fileName);
    return $result;
}

并使用以下代码启动此功能：

createCanvasImage($_POST['canvas'], 500, 500, "checkSign.png");

这是output image i am getting

提前致谢！

php gd在顶部其他png图像上写图像

0 个答案: