c# 图形 放大缩小旋转 代码

在 C# 中，图形的放大、缩小和旋转通常涉及到窗口上的图形控件（如PictureBox或Windows Presentation Foundation (WPF) 的 Image 或 UIElement）。这里给出一个基本的例子，使用Windows Forms中的PictureBox和AForge.NET库（用于图像处理）：

using System.Drawing;
using AForge.Imaging;

public partial class Form1 : Form
{
    private Bitmap originalImage; // 原始图片

    public Form1()
    {
        InitializeComponent();
        LoadImage(); // 加载图片到PictureBox
    }

    private void LoadImage()
    {
        pictureBox1.Image = new Bitmap("path_to_your_image.jpg"); // 替换为实际图片路径
        originalImage = (Bitmap)pictureBox1.Image.Clone(); // 保存原始尺寸
    }

    // 按比例缩放图片
    private void zoomPictureBox(float scale)
    {
        Bitmap scaledImage = new Bitmap(pictureBox1.Width * scale, pictureBox1.Height * scale);
        Graphics g = Graphics.FromImage(scaledImage);
        g.InterpolationMode = InterpolationMode.HighQualityBicubic;
        g.DrawImage(originalImage, 0, 0, scaledImage.Width, scaledImage.Height);
        pictureBox1.Image = scaledImage;
    }

    // 旋转图片
    private void rotatePictureBox(float angleInDegrees)
    {
        RotateFlipType flipType = RotateFlipType.RotateNoneFlipX;
        RotateFlip(rotationAngle: angleInDegrees, flipHorizontal: flipType == RotateFlipType.RotateNoneFlipX,
                  flipVertical: flipType == RotateFlipType.Rotate90FlipXY);
    }

    // 自定义旋转方法
    private void RotateFlip(int rotationAngle, bool flipHorizontal, bool flipVertical)
    {
        using (Bitmap rotatedImage = new Bitmap(pictureBox1.Width, pictureBox1.Height))
        {
            Graphics g = Graphics.FromImage(rotatedImage);
            g.TranslateTransform(-pictureBox1.Width / 2, -pictureBox1.Height / 2);
            g.RotateTransform(rotationAngle);
            g.TranslateTransform(pictureBox1.Width / 2, pictureBox1.Height / 2);

            if (flipHorizontal || flipVertical)
                g.FlipFlip(flipHorizontal, flipVertical);

            g.DrawImage(originalImage, new Rectangle(0, 0, rotatedImage.Width, rotatedImage.Height));
            pictureBox1.Image = rotatedImage;
        }
    }

    // 示例：触发缩放和旋转事件
    private void buttonZoom_Click(object sender, EventArgs e)
    {
        zoomPictureBox(scaleFactor); // 调整scaleFactor为所需比例
    }

    private void buttonRotate_Click(object sender, EventArgs e)
    {
        rotatePictureBox(angleDegree); // 调整angleDegree为所需度数
    }
}