using System;
using System.Drawing;
using System.Drawing.Printing;
using System.Windows.Forms;

namespace CSFrameworkV5.Order
{
    public partial class FrmPictViwe : Form
    {
        private float scaleFactor = 1.0f; // 初始缩放比例为1
        private Image originalImage; // 原始图片
        private Point lastMousePos; // 记录鼠标按下的位置
        private Point imageOffset; // 图片的偏移量
        private bool isDragging; // 是否正在拖动图片

        public FrmPictViwe(Image pth)
        {
            InitializeComponent();
            pictureBox1.SizeMode =
                PictureBoxSizeMode.AutoSize; // 自动调整 PictureBox 大小以适应图片
            pictureBox1.MouseWheel +=
                PictureBox1_MouseWheel; // 订阅 MouseWheel 事件
            pictureBox1.MouseDown += PictureBox1_MouseDown; // 订阅 MouseDown 事件
            pictureBox1.MouseMove += PictureBox1_MouseMove; // 订阅 MouseMove 事件
            pictureBox1.Paint += PictureBox1_Paint; // 订阅 Paint 事件
            pictureBox1.MouseUp += PictureBox1_MouseUp; // 订阅 MouseUp 事件
            DoubleBuffered = true; // 启用双缓冲绘制


            try
            {
                originalImage = pth; // 加载图片
                pictureBox1.Image = originalImage; // 设置原始图片
                pictureBox1.Invalidate(); // 刷新PictureBox
            }
            catch (Exception ex)
            {
                MessageBox.Show("图号未上传，请先上传");
                return;
            }
        }

        private void PictureBox1_MouseWheel(object sender, MouseEventArgs e)
        {
            if (pictureBox1.Image != null)
            {
                // 计算缩放比例
                var zoomFactor = e.Delta > 0 ? 1.2f : 0.8f; // 向上滚动放大，向下滚动缩小

                // 更新缩放比例
                scaleFactor *= zoomFactor;

                // 计算缩放后的图片大小
                var newWidth = (int)(originalImage.Width * scaleFactor);
                var newHeight = (int)(originalImage.Height * scaleFactor);

                // 创建缩放后的图片
                Image scaledImage =
                    new Bitmap(originalImage, newWidth, newHeight);

                // 更新 PictureBox 的 Image
                pictureBox1.Image = scaledImage;

                // 刷新PictureBox
                pictureBox1.Invalidate();
            }
        }

        private void PictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                lastMousePos = e.Location; // 记录鼠标按下的位置
                isDragging = true; // 开始拖动图片
            }
        }

        private void PictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (isDragging)
            {
                // 计算鼠标移动的距离
                var deltaX = e.X - lastMousePos.X;
                var deltaY = e.Y - lastMousePos.Y;

                // 更新图片的偏移量
                imageOffset.X += deltaX;
                imageOffset.Y += deltaY;

                // 更新鼠标按下的位置
                lastMousePos = e.Location;

                // 刷新PictureBox
                pictureBox1.Invalidate();
            }
        }

        private void PictureBox1_Paint(object sender, PaintEventArgs e)
        {
            var g = e.Graphics;

            // 清空画布
            g.Clear(Color.White);

            // 平移绘图坐标系
            g.TranslateTransform(imageOffset.X, imageOffset.Y);

            // 绘制图片
            g.DrawImage(pictureBox1.Image, Point.Empty);
        }

        private void PictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                isDragging = false; // 停止拖动图片

                // 计算缩放后的图片大小
                var newWidth = (int)(originalImage.Width * scaleFactor);
                var newHeight = (int)(originalImage.Height * scaleFactor);

                // 调整PictureBox的大小以适应缩放比例
                pictureBox1.Size = new Size(newWidth, newHeight);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            // 计算缩放比例
            scaleFactor *= 1.2f;

            // 计算缩放后的图片大小
            var newWidth = (int)(originalImage.Width * scaleFactor);
            var newHeight = (int)(originalImage.Height * scaleFactor);

            // 创建缩放后的图片
            Image scaledImage = new Bitmap(originalImage, newWidth, newHeight);

            // 更新PictureBox的Image
            pictureBox1.Image = scaledImage;

            // 刷新PictureBox
            pictureBox1.Invalidate();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            // 计算缩放比例
            scaleFactor *= 0.8f;

            // 计算缩放后的图片大小
            var newWidth = (int)(originalImage.Width * scaleFactor);
            var newHeight = (int)(originalImage.Height * scaleFactor);

            // 创建缩放后的图片
            Image scaledImage = new Bitmap(originalImage, newWidth, newHeight);

            // 更新PictureBox的Image
            pictureBox1.Image = scaledImage;

            // 刷新PictureBox
            pictureBox1.Invalidate();
        }


        private void btnPrint_Click(object sender, EventArgs e)
        {
            var printDocument = new PrintDocument();
            printDocument.PrintPage += new PrintPageEventHandler(PrintImage);
            var printDialog = new PrintDialog();
            printDialog.Document = printDocument;
            if (printDialog.ShowDialog() == DialogResult.OK)
                printDocument.Print();
        }

        private void PrintImage(object sender, PrintPageEventArgs e)
        {
            var imageToPrint = originalImage;
            // 获取图像的原始尺寸
            var imageWidth = imageToPrint.Width;
            var imageHeight = imageToPrint.Height;
            // 获取打印区域的尺寸
            var printArea = e.MarginBounds;
            var printWidth = printArea.Width;
            var printHeight = printArea.Height;
            // 等比例缩放图像以适应打印区域
            var scale = Math.Min((float)printWidth / imageWidth,
                (float)printHeight / imageHeight);
            var scaledWidth = (int)(imageWidth * scale * 1.2);
            var scaledHeight = (int)(imageHeight * scale * 1.2);
            // 计算图像在打印区域的位置
            var x = printArea.Left + (printWidth - scaledWidth) / 2;
            var y = printArea.Top + (printHeight - scaledHeight) / 2;
            // 绘制图像
            e.Graphics.DrawImage(imageToPrint, x, y, scaledWidth, scaledHeight);
        }
    }
}