[PHP GD Study]我的世界皮肤转迷你世界

涉及图片旋转、放大、复制
目前仅实现了头部的复制

准备工作：

1. 迷你世界皮肤底图（命名为miniw.png）：
   
2. 我的世界皮肤：
   

源代码：

⚠AI生成

<?php
// 设置上传文件的目标目录
$target_dir = "uploads/";
// 创建目标目录如果不存在
if (!file_exists($target_dir)) {
    mkdir($target_dir, 0777, true);
}
// 设置上传文件的名称
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);

// 检查是否有文件被上传
if (isset($_POST["submit"])) {
    // 检查文件是否已上传且不是错误上传
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        // 加载图片
        $image = imagecreatefrompng($target_file);

        // 加载 miniw.png 文件
        $miniwFile = 'miniw.png';
        $miniwImage = imagecreatefrompng($miniwFile);

        // 指定头部在 miniw.png 中的位置
        $headX = 490;
        $headY = 600;
        // 提取头部区域
        $headWidth = 8;
        $headHeight = 8;
        $originalHeadX = 8;
        $originalHeadY = 8;
        $scaleFactor = 50;

        // 创建一个新的图像来存储头部
        $headImage = imagecreatetruecolor($headWidth, $headHeight);
        $rightheadImage = imagecreatetruecolor($headWidth, $headHeight);
        $topheadImage = imagecreatetruecolor($headWidth, $headHeight);
        $leftheadImage = imagecreatetruecolor($headWidth, $headHeight);
        $bottomheadImage = imagecreatetruecolor($headWidth, $headHeight);
        $backheadImage = imagecreatetruecolor($headWidth, $headHeight); // 新增
        
        // 复制头部区域到新图像
        imagecopy($headImage, $image, 0, 0, $originalHeadX, $originalHeadY, $headWidth, $headHeight);
        imagecopy($rightheadImage, $image, 0, 0, $originalHeadX-8, $originalHeadY, $headWidth, $headHeight);
        imagecopy($topheadImage, $image, 0, 0, $originalHeadX, $originalHeadY-8, $headWidth, $headHeight);
        imagecopy($leftheadImage, $image, 0, 0, $originalHeadX+8, $originalHeadY, $headWidth, $headHeight);
        imagecopy($bottomheadImage, $image, 0, 0, $originalHeadX+8, $originalHeadY-8, $headWidth, $headHeight);
        imagecopy($backheadImage, $image, 0, 0, $originalHeadX + 8 + 8, $originalHeadY, $headWidth, $headHeight); // 新增

        // 创建放大后的头部图像
        $scaledHeadImage = imagecreatetruecolor($headWidth * $scaleFactor, $headHeight * $scaleFactor);
        $scaledRightHeadImage = imagecreatetruecolor($headWidth * $scaleFactor, $headHeight * $scaleFactor);
        $scaledTopHeadImage = imagecreatetruecolor($headWidth * $scaleFactor, $headHeight * $scaleFactor);
        $scaledLeftHeadImage = imagecreatetruecolor($headWidth * $scaleFactor, $headHeight * $scaleFactor);
        $scaledBottomHeadImage = imagecreatetruecolor($headWidth * $scaleFactor, $headHeight * $scaleFactor);
        $scaledBackHeadImage = imagecreatetruecolor($headWidth * $scaleFactor, $headHeight * $scaleFactor); // 新增

        // 放大头部图像
        imagecopyresampled($scaledHeadImage, $headImage, 0, 0, 0, 0, $headWidth * $scaleFactor, $headHeight * $scaleFactor, $headWidth, $headHeight);
        imagecopyresampled($scaledRightHeadImage, $rightheadImage, 0, 0, 0, 0, $headWidth * $scaleFactor, $headHeight * $scaleFactor, $headWidth, $headHeight);
        imagecopyresampled($scaledTopHeadImage, $topheadImage, 0, 0, 0, 0, $headWidth * $scaleFactor, $headHeight * $scaleFactor, $headWidth, $headHeight);
        imagecopyresampled($scaledLeftHeadImage, $leftheadImage, 0, 0, 0, 0, $headWidth * $scaleFactor, $headHeight * $scaleFactor, $headWidth, $headHeight);
        imagecopyresampled($scaledBottomHeadImage, $bottomheadImage, 0, 0, 0, 0, $headWidth * $scaleFactor, $headHeight * $scaleFactor, $headWidth, $headHeight);
        imagecopyresampled($scaledBackHeadImage, $backheadImage, 0, 0, 0, 0, $headWidth * $scaleFactor, $headHeight * $scaleFactor, $headWidth, $headHeight); // 新增

        // 将头部图像粘贴到 miniw.png 上
        imagecopy($miniwImage, $scaledHeadImage, $headX, $headY, 0, 0, $headWidth * $scaleFactor, $headHeight * $scaleFactor);
        imagecopy($miniwImage, $scaledRightHeadImage, $headX - $headWidth * $scaleFactor, $headY, 0, 0, $headWidth * $scaleFactor, $headHeight * $scaleFactor);
        imagecopy($miniwImage, $scaledTopHeadImage, $headX, $headY-$headHeight * $scaleFactor, 0, 0, $headWidth * $scaleFactor, $headHeight * $scaleFactor);
        imagecopy($miniwImage, $scaledLeftHeadImage, $headX+$headWidth * $scaleFactor, $headY, 0, 0, $headWidth * $scaleFactor, $headHeight * $scaleFactor);
        imagecopy($miniwImage, $scaledBottomHeadImage, $headX, $headY+$headHeight * $scaleFactor, 0, 0, $headWidth * $scaleFactor, $headHeight * $scaleFactor);
        imagecopy($miniwImage, $scaledBackHeadImage, $headX + $headHeight * $scaleFactor * 2, $headY, 0, 0, $headWidth * $scaleFactor, $headHeight * $scaleFactor); // 新增

        // 输出最终图像
        header('Content-Type: image/png');
        imagepng($miniwImage);

        imagedestroy($image);
        imagedestroy($headImage);
        imagedestroy($rightheadImage);
        imagedestroy($topheadImage);
        imagedestroy($leftheadImage);
        imagedestroy($bottomheadImage);
        imagedestroy($backheadImage); // 新增
        imagedestroy($scaledHeadImage);
        imagedestroy($scaledRightHeadImage);
        imagedestroy($scaledTopHeadImage);
        imagedestroy($scaledLeftHeadImage);
        imagedestroy($scaledBottomHeadImage);
        imagedestroy($scaledBackHeadImage); // 新增
        imagedestroy($miniwImage);

        // 删除上传的文件
        unlink($target_file);
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
}

// HTML 表单用于上传文件
?>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="POST" enctype="multipart/form-data">
    Select Minecraft skin to upload:
    <input type="file" name="fileToUpload" id="fileToUpload">
    <input type="submit" value="Upload Skin" name="submit">
</form>

升级（也是半成品）

<?php
function createScaledImage($originalImage, $width, $height, $scaleFactor) {
    $scaledImage = imagecreatetruecolor($width * $scaleFactor, $height * $scaleFactor);
    imagecopyresampled($scaledImage, $originalImage, 0, 0, 0, 0, $width * $scaleFactor, $height * $scaleFactor, $width, $height);
    return $scaledImage;
}

function processImage($target_file, $headWidth, $headHeight, $scaleFactor, $headX, $headY, $originalHeadX, $originalHeadY) {
    try {
        $image = imagecreatefrompng($target_file); // 假设上传的图片为PNG格式

        $headImage = imagecreatetruecolor($headWidth, $headHeight);
        $rightheadImage = imagecreatetruecolor($headWidth, $headHeight);
        $topheadImage = imagecreatetruecolor($headWidth, $headHeight);
        $leftheadImage = imagecreatetruecolor($headWidth, $headHeight);
        $bottomheadImage = imagecreatetruecolor($headWidth, $headHeight);
        $backheadImage = imagecreatetruecolor($headWidth, $headHeight);

        // 复制头部区域到新图像
        imagecopy($headImage, $image, 0, 0, $originalHeadX, $originalHeadY, $headWidth, $headHeight);
        imagecopy($rightheadImage, $image, 0, 0, $originalHeadX-8, $originalHeadY, $headWidth, $headHeight);
        imagecopy($topheadImage, $image, 0, 0, $originalHeadX, $originalHeadY-8, $headWidth, $headHeight);
        imagecopy($leftheadImage, $image, 0, 0, $originalHeadX+8, $originalHeadY, $headWidth, $headHeight);
        imagecopy($bottomheadImage, $image, 0, 0, $originalHeadX+8, $originalHeadY-8, $headWidth, $headHeight);
        imagecopy($backheadImage, $image, 0, 0, $originalHeadX + 8 + 8, $originalHeadY, $headWidth, $headHeight);

        // 创建放大后的头部图像
        $headImages = [
            'head' => $headImage,
            'right' => $rightheadImage,
            'top' => $topheadImage,
            'left' => $leftheadImage,
            'bottom' => $bottomheadImage,
            'back' => $backheadImage
        ];

        $scaledHeadImages = [];
        foreach ($headImages as $key => $img) {
            $scaledHeadImages[$key] = createScaledImage($img, $headWidth, $headHeight, $scaleFactor);
        }

        // 提取左手部分
        $handWidth = 4;
        $handHeight = 16;
        $originalHandX = 0;
        $originalHandY = 16;
        $lefthandImage = imagecreatetruecolor($handWidth, $handHeight);
        imagecopy($lefthandImage, $image, 0, 0, $originalHandX, $originalHandY, $handWidth, $handHeight);

        // 旋转左手图像 90 度
        $rotatedLefthandImage = imagerotate($lefthandImage, 90, 0);

        // 创建放大后的左手图像
        $scaledLefthandImage = createScaledImage($rotatedLefthandImage, $handHeight, $handWidth, $scaleFactor);

        // 加载 miniw.png
        $miniwImage = imagecreatefrompng('miniw.png');

        // 粘贴头部图像到 miniw.png
        foreach ($scaledHeadImages as $key => $scaledImg) {
            $dx = 0; $dy = 0;
            switch ($key) {
                case 'right': $dx = $headX - $headWidth * $scaleFactor; break;
                case 'top': $dy = $headY - $headHeight * $scaleFactor; break;
                case 'left': $dx = $headX + $headWidth * $scaleFactor; break;
                case 'bottom': $dy = $headY + $headHeight * $scaleFactor; break;
                case 'back': $dx = $headX + $headHeight * $scaleFactor * 2; break;
                default: $dx = $headX; $dy = $headY; break;
            }
            imagecopy($miniwImage, $scaledImg, $dx, $dy, 0, 0, $headWidth * $scaleFactor, $headHeight * $scaleFactor);
        }

        // 粘贴左手图像到 miniw.png
        imagecopy($miniwImage, $scaledLefthandImage, 0, 600, 0, 0, $handHeight * $scaleFactor, $handWidth * $scaleFactor);

        // 输出最终图像
        header('Content-Type: image/png');
        imagepng($miniwImage);

    } catch (Exception $e) {
        echo "Error: " . $e->getMessage();
    } finally {
        // 销毁所有使用的图像资源
        foreach (array_merge(array_values($headImages), array_values($scaledHeadImages), [$lefthandImage, $rotatedLefthandImage, $scaledLefthandImage, $miniwImage, $image]) as $img) {
            imagedestroy($img);
        }
        // 删除上传的文件
        if (isset($target_file)) {
            unlink($target_file);
        }
    }
}

// 检查是否有文件上传
if (isset($_FILES['fileToUpload']) && $_FILES['fileToUpload']['error'] === UPLOAD_ERR_OK) {
    $target_dir = "uploads/";
    $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);

    // 检查文件是否已存在
    if (file_exists($target_file)) {
        echo "Sorry, file already exists.";
    } else {
        // 允许上传的文件类型
        $allowed_types = ['image/png', 'image/jpeg'];
        if (in_array($_FILES['fileToUpload']['type'], $allowed_types)) {
            // 限制文件大小
            if ($_FILES['fileToUpload']['size'] < 1000000) { // 1MB
                // 移动上传的文件
                if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
                    // 调用处理函数
                    processImage($target_file, 64, 64, 2, 100, 100, 100, 100);
                } else {
                    echo "Sorry, there was an error uploading your file.";
                }
            } else {
                echo "Sorry, your file is too large.";
            }
        } else {
            echo "Sorry, only PNG and JPEG files are allowed.";
        }
    }
}

// HTML 表单用于上传文件
echo '<form action="' . htmlspecialchars($_SERVER["PHP_SELF"]) . '" method="post" enctype="multipart/form-data">
    Select image to upload:
    <input type="file" name="fileToUpload" id="fileToUpload">
    <input type="submit" value="Upload Image" name="submit">
</form>';
?>