使用c#把dxf转为bmp文件的完整代码

以下是使用C#将DXF文件转换为BMP文件的示例代码：

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Windows.Forms;
using netDxf;

namespace DxfToBmpConverter
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            // Set default input and output file paths
            inputFilePathTextBox.Text = Path.Combine(Application.StartupPath, "sample.dxf");
            outputFilePathTextBox.Text = Path.Combine(Application.StartupPath, "sample.bmp");
        }

        private void browseInputFileButton_Click(object sender, EventArgs e)
        {
            // Show open file dialog and set selected file path as input file path
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Filter = "DXF Files (*.dxf)|*.dxf";
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                inputFilePathTextBox.Text = openFileDialog.FileName;
            }
        }

        private void browseOutputFileButton_Click(object sender, EventArgs e)
        {
            // Show save file dialog and set selected file path as output file path
            SaveFileDialog saveFileDialog = new SaveFileDialog();
            saveFileDialog.Filter = "BMP Files (*.bmp)|*.bmp";
            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                outputFilePathTextBox.Text = saveFileDialog.FileName;
            }
        }

        private void convertButton_Click(object sender, EventArgs e)
        {
            // Check if input file exists
            if (!File.Exists(inputFilePathTextBox.Text))
            {
                MessageBox.Show("Input file does not exist!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            // Load DXF file
            DxfDocument dxfDocument = DxfDocument.Load(inputFilePathTextBox.Text);

            // Calculate drawing bounds
            double minX = 0, minY = 0, maxX = 0, maxY = 0;
            foreach (DxfEntity entity in dxfDocument.Entities)
            {
                if (entity is DxfLwPolyline lwPolyline)
                {
                    foreach (Vector2 vertex in lwPolyline.Vertexes)
                    {
                        if (vertex.X < minX) minX = vertex.X;
                        if (vertex.X > maxX) maxX = vertex.X;
                        if (vertex.Y < minY) minY = vertex.Y;
                        if (vertex.Y > maxY) maxY = vertex.Y;
                    }
                }
                else if (entity is DxfLine line)
                {
                    if (line.StartPoint.X < minX) minX = line.StartPoint.X;
                    if (line.StartPoint.X > maxX) maxX = line.StartPoint.X;
                    if (line.StartPoint.Y < minY) minY = line.StartPoint.Y;
                    if (line.StartPoint.Y > maxY) maxY = line.StartPoint.Y;
                    if (line.EndPoint.X < minX) minX = line.EndPoint.X;
                    if (line.EndPoint.X > maxX) maxX = line.EndPoint.X;
                    if (line.EndPoint.Y < minY) minY = line.EndPoint.Y;
                    if (line.EndPoint.Y > maxY) maxY = line.EndPoint.Y;
                }
                // Add additional cases for other entity types as needed
            }

            // Calculate drawing scale and size
            double drawingWidth = maxX - minX;
            double drawingHeight = maxY - minY;
            double drawingScale = Math.Max(drawingWidth, drawingHeight) / Math.Min(pictureBox.Width, pictureBox.Height);
            int bmpWidth = (int)Math.Round(drawingWidth / drawingScale);
            int bmpHeight = (int)Math.Round(drawingHeight / drawingScale);

            // Create bitmap and graphics objects
            Bitmap bmp = new Bitmap(bmpWidth, bmpHeight, PixelFormat.Format24bppRgb);
            Graphics graphics = Graphics.FromImage(bmp);
            graphics.SmoothingMode = SmoothingMode.AntiAlias;
            graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
            graphics.Clear(Color.White);

            // Draw entities onto bitmap
            foreach (DxfEntity entity in dxfDocument.Entities)
            {
                if (entity is DxfLwPolyline lwPolyline)
                {
                    PointF[] points = new PointF[lwPolyline.Vertexes.Count];
                    for (int i = 0; i < lwPolyline.Vertexes.Count; i++)
                    {
                        points[i] = new PointF(
                            (float)((lwPolyline.Vertexes[i].X - minX) / drawingScale),
                            (float)((maxY - lwPolyline.Vertexes[i].Y) / drawingScale));
                    }
                    graphics.DrawLines(new Pen(Color.Black, lwPolyline.Thickness), points);
                }
                else if (entity is DxfLine line)
                {
                    PointF startPoint = new PointF(
                        (float)((line.StartPoint.X - minX) / drawingScale),
                        (float)((maxY - line.StartPoint.Y) / drawingScale));
                    PointF endPoint = new PointF(
                        (float)((line.EndPoint.X - minX) / drawingScale),
                        (float)((maxY - line.EndPoint.Y) / drawingScale));
                    graphics.DrawLine(new Pen(Color.Black, line.Thickness), startPoint, endPoint);
                }
                // Add additional cases for other entity types as needed
            }

            // Save bitmap to output file
            bmp.Save(outputFilePathTextBox.Text, ImageFormat.Bmp);

            // Clean up resources
            bmp.Dispose();
            graphics.Dispose();

            // Show success message
            MessageBox.Show("Conversion successful!", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
    }
}

请注意，这是一个简单的示例，可能不适用于所有情况。您可能需要根据您的需求进行更改和修改。