基于C#和Halcon实现的鼠标控制图片缩放、拖动以及ROI绘制

private void hWindowControl1_HMouseWheel(object sender, HMouseEventArgs e)
{
    double zoomFactor = e.Delta > 0 ? 1.1 : 0.9;
    HOperatorSet.GetMposition(hWindowControl1.HalconWindow, out int row, out int col, out _);
    HOperatorSet.GetPart(hWindowControl1.HalconWindow, out int row1, out int col1, out int row2, out int col2);
    int h = row2 - row1;
    int w = col2 - col1;
​
    if (h * w < 32000 * 32000 || zoomFactor == 1.1)
    {
        double r1 = row1 + ((1 - (1.0 / zoomFactor)) * (row - row1));
        double c1 = col1 + ((1 - (1.0 / zoomFactor)) * (col - col1));
        double r2 = r1 + (h / zoomFactor);
        double c2 = c1 + (w / zoomFactor);
​
        HOperatorSet.SetPart(hWindowControl1.HalconWindow, r1, c1, r2, c2);
        hWindowControl1.HalconWindow.ClearWindow();
        hWindowControl1.HalconWindow.DispObj(image);
    }
}

private bool isDragging = false;
private Point dragStartPos;
​
private void hWindowControl1_HMouseDown(object sender, HMouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        isDragging = true;
        dragStartPos = new Point(e.X, e.Y);
    }
}
​
private void hWindowControl1_HMouseMove(object sender, HMouseEventArgs e)
{
    if (isDragging)
    {
        int deltaX = e.X - dragStartPos.X;
        int deltaY = e.Y - dragStartPos.Y;
​
        hWindowControl1.HalconWindow.GetPart(out int row1, out int col1, out int row2, out int col2);
        hWindowControl1.HalconWindow.SetPart(row1 - deltaY, col1 - deltaX, row2 - deltaY, col2 - deltaX);
        hWindowControl1.HalconWindow.DispObj(image);
​
        dragStartPos = new Point(e.X, e.Y);
    }
}
​
private void hWindowControl1_HMouseUp(object sender, HMouseEventArgs e)
{
    isDragging = false;
}

private HObject selectedRegion;
​
private void btnSelectROI_Click(object sender, EventArgs e)
{
    hWindowControl1.HalconWindow.DrawRectangle1(out double row1, out double col1, out double row2, out double col2);
    HOperatorSet.GenRectangle1(out selectedRegion, row1, col1, row2, col2);
    hWindowControl1.HalconWindow.SetColor("red");
    hWindowControl1.HalconWindow.DispObj(selectedRegion);
}

public MainForm()
{
    InitializeComponent();
    hWindowControl1.HMouseWheel += hWindowControl1_HMouseWheel;
    hWindowControl1.HMouseDown += hWindowControl1_HMouseDown;
    hWindowControl1.HMouseMove += hWindowControl1_HMouseMove;
    hWindowControl1.HMouseUp += hWindowControl1_HMouseUp;
}

private void btnLoadImage_Click(object sender, EventArgs e)
{
    OpenFileDialog openFileDialog = new OpenFileDialog();
    openFileDialog.Filter = "所有图像文件 (*.bmp;*.pcx;*.png;*.jpg;*.gif;*.tif;*.ico;*.dxf;*.cgm;*.cdr;*.wmf;*.eps;*.emf)|*.bmp;*.pcx;*.png;*.jpg;*.gif;*.tif;*.ico;*.dxf;*.cgm;*.cdr;*.wmf;*.eps;*.emf";
    if (openFileDialog.ShowDialog() == DialogResult.OK)
    {
        HOperatorSet.ReadImage(out HObject image, openFileDialog.FileName);
        hWindowControl1.HalconWindow.DispObj(image);
    }
}