using System;
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using System.Drawing;
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using System.Drawing.Printing;
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using System.Windows.Forms;
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namespace CSFrameworkV5.Order
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{
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public partial class FrmPictViwe : Form
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{
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private float scaleFactor = 1.0f; // 初始缩放比例为1
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private Image originalImage; // 原始图片
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private Point lastMousePos; // 记录鼠标按下的位置
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private Point imageOffset; // 图片的偏移量
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private bool isDragging; // 是否正在拖动图片
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public FrmPictViwe(Image pth)
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{
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InitializeComponent();
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pictureBox1.SizeMode =
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PictureBoxSizeMode.AutoSize; // 自动调整 PictureBox 大小以适应图片
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pictureBox1.MouseWheel +=
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PictureBox1_MouseWheel; // 订阅 MouseWheel 事件
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pictureBox1.MouseDown += PictureBox1_MouseDown; // 订阅 MouseDown 事件
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pictureBox1.MouseMove += PictureBox1_MouseMove; // 订阅 MouseMove 事件
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pictureBox1.Paint += PictureBox1_Paint; // 订阅 Paint 事件
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pictureBox1.MouseUp += PictureBox1_MouseUp; // 订阅 MouseUp 事件
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DoubleBuffered = true; // 启用双缓冲绘制
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try
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{
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originalImage = pth; // 加载图片
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pictureBox1.Image = originalImage; // 设置原始图片
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pictureBox1.Invalidate(); // 刷新PictureBox
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}
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catch (Exception ex)
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{
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MessageBox.Show("图号未上传，请先上传");
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return;
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}
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}
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private void PictureBox1_MouseWheel(object sender, MouseEventArgs e)
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{
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if (pictureBox1.Image != null)
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{
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// 计算缩放比例
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var zoomFactor = e.Delta > 0 ? 1.2f : 0.8f; // 向上滚动放大，向下滚动缩小
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// 更新缩放比例
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scaleFactor *= zoomFactor;
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// 计算缩放后的图片大小
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var newWidth = (int)(originalImage.Width * scaleFactor);
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var newHeight = (int)(originalImage.Height * scaleFactor);
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// 创建缩放后的图片
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Image scaledImage =
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new Bitmap(originalImage, newWidth, newHeight);
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// 更新 PictureBox 的 Image
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pictureBox1.Image = scaledImage;
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// 刷新PictureBox
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pictureBox1.Invalidate();
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}
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}
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private void PictureBox1_MouseDown(object sender, MouseEventArgs e)
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{
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if (e.Button == MouseButtons.Left)
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{
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lastMousePos = e.Location; // 记录鼠标按下的位置
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isDragging = true; // 开始拖动图片
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}
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}
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private void PictureBox1_MouseMove(object sender, MouseEventArgs e)
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{
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if (isDragging)
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{
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// 计算鼠标移动的距离
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var deltaX = e.X - lastMousePos.X;
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var deltaY = e.Y - lastMousePos.Y;
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// 更新图片的偏移量
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imageOffset.X += deltaX;
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imageOffset.Y += deltaY;
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// 更新鼠标按下的位置
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lastMousePos = e.Location;
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// 刷新PictureBox
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pictureBox1.Invalidate();
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}
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}
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private void PictureBox1_Paint(object sender, PaintEventArgs e)
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{
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var g = e.Graphics;
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// 清空画布
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g.Clear(Color.White);
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// 平移绘图坐标系
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g.TranslateTransform(imageOffset.X, imageOffset.Y);
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// 绘制图片
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g.DrawImage(pictureBox1.Image, Point.Empty);
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}
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private void PictureBox1_MouseUp(object sender, MouseEventArgs e)
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{
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if (e.Button == MouseButtons.Left)
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{
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isDragging = false; // 停止拖动图片
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// 计算缩放后的图片大小
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var newWidth = (int)(originalImage.Width * scaleFactor);
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var newHeight = (int)(originalImage.Height * scaleFactor);
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// 调整PictureBox的大小以适应缩放比例
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pictureBox1.Size = new Size(newWidth, newHeight);
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}
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}
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private void button1_Click(object sender, EventArgs e)
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{
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// 计算缩放比例
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scaleFactor *= 1.2f;
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// 计算缩放后的图片大小
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var newWidth = (int)(originalImage.Width * scaleFactor);
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var newHeight = (int)(originalImage.Height * scaleFactor);
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// 创建缩放后的图片
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Image scaledImage = new Bitmap(originalImage, newWidth, newHeight);
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// 更新PictureBox的Image
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pictureBox1.Image = scaledImage;
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// 刷新PictureBox
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pictureBox1.Invalidate();
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}
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private void button2_Click(object sender, EventArgs e)
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{
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// 计算缩放比例
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scaleFactor *= 0.8f;
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// 计算缩放后的图片大小
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var newWidth = (int)(originalImage.Width * scaleFactor);
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var newHeight = (int)(originalImage.Height * scaleFactor);
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// 创建缩放后的图片
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Image scaledImage = new Bitmap(originalImage, newWidth, newHeight);
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// 更新PictureBox的Image
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pictureBox1.Image = scaledImage;
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// 刷新PictureBox
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pictureBox1.Invalidate();
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}
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private void btnPrint_Click(object sender, EventArgs e)
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{
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var printDocument = new PrintDocument();
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printDocument.PrintPage += new PrintPageEventHandler(PrintImage);
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var printDialog = new PrintDialog();
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printDialog.Document = printDocument;
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if (printDialog.ShowDialog() == DialogResult.OK)
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printDocument.Print();
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}
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private void PrintImage(object sender, PrintPageEventArgs e)
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{
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var imageToPrint = originalImage;
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// 获取图像的原始尺寸
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var imageWidth = imageToPrint.Width;
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var imageHeight = imageToPrint.Height;
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// 获取打印区域的尺寸
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var printArea = e.MarginBounds;
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var printWidth = printArea.Width;
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var printHeight = printArea.Height;
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// 等比例缩放图像以适应打印区域
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var scale = Math.Min((float)printWidth / imageWidth,
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(float)printHeight / imageHeight);
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var scaledWidth = (int)(imageWidth * scale * 1.2);
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var scaledHeight = (int)(imageHeight * scale * 1.2);
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// 计算图像在打印区域的位置
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var x = printArea.Left + (printWidth - scaledWidth) / 2;
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var y = printArea.Top + (printHeight - scaledHeight) / 2;
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// 绘制图像
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e.Graphics.DrawImage(imageToPrint, x, y, scaledWidth, scaledHeight);
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}
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}
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}
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