Question

我正在创建一个简单的PHP精灵图像生成器，我能够计算精灵图像的可能宽度和高度，但我坚持创建透明画布并将图像放入其中。

现在假设精灵图像的宽度是200x500px（我正在创建垂直精灵）。放在精灵图像中的图像是这样的数组：

array('logo.png','delete.png','open.png');

你将如何将这些图像放入精灵中？

Answer 1

        $path = '/img/';
        $imgs = array('logo.png','delete.png','save.png');//images needed to be put in the sprite
        $canvasWidth= 0;
        $canvasHeight = 0;

        //calculate the posible canvas width and height
        foreach($imgs as $val)
        {
            $info = getimagesize($path.basename($val));
            $width=$info[0];
            $height=$info[1];
            $canvasHeight +=$height;
            if($canvasWidth < $width){
                $canvasWidth = $width;
            }
        }

        // create our canvas
        $img = imagecreatetruecolor($canvasWidth, $canvasHeight);
        $background = imagecolorallocatealpha($img, 255, 255, 255, 127);
        imagefill($img, 0, 0, $background);
        imagealphablending($img, false);
        imagesavealpha($img, true);

        // start placing our icons from the top down.
        $pos = 0;
        foreach($imgs as $val){
            $tmp = imagecreatefrompng($path.basename($val));
                $w=imagesx($tmp);
                $h=imagesy($tmp);
                imagecopy($img, $tmp, 0, $pos, 0, 0, $w, $h);
                $pos += $h;
            imagedestroy($tmp);
        }

        // create our final output image.
        imagepng($img, $path.'sprite.png');

PHP-将单个图像放入透明画布中

1 个答案: