Question

我的图像大于PictureEdit框问题，当使用鼠标创建矩形时，未选择图像上的正确点。它似乎是在PictureEdit中选择点而不是它自己的图像。我正在尝试裁剪图像并将裁剪后的图像放在新的Pictureedit中。示例代码如下。

private void originalPictureEdit_MouseDown(object sender, MouseEventArgs e)
{
    //Point TextStartLocation = e.Location;
    Cursor = Cursors.IBeam;

    if (_drawStarted == false)
    {
        _drawStarted = true;

        if (e.Button == System.Windows.Forms.MouseButtons.Left)
        {
            Cursor = Cursors.Cross;

            _cropX = e.X;
            _cropY = e.Y;
            _selection = new Rectangle(new Point(e.X, e.Y), new Size());
            _cropPen = new Pen(Color.Black, 1);
            _cropPen.DashStyle = DashStyle.DashDotDot;
        }
    }

    originalPictureEdit.Refresh();
}

private void originalPictureEdit_MouseMove(object sender, MouseEventArgs e)
{

    if (originalPictureEdit.Image == null)
        return;

    if (e.Button == System.Windows.Forms.MouseButtons.Left)
    {
        originalPictureEdit.Refresh();
        _selection.Width = e.X - _selection.X;
        _selection.Height = e.Y - _selection.Y;
        originalPictureEdit.CreateGraphics().DrawRectangle(_cropPen, _cropX, _cropY, _selection.Width, _selection.Height);

    }          
}

private void originalPictureEdit_MouseUp(object sender, MouseEventArgs e)
{
     if (e.Button == MouseButtons.Left && _drawStarted && _selection.Size != new Size())
     {
         _croppedImage = (_displayedImage as Bitmap).Clone(_selection, _displayedImage.PixelFormat);

         modifiedPictureEdit.Image = _croppedImage;
         modifiedPictureEdit.Width = _croppedImage.Width;
         modifiedPictureEdit.Height = _croppedImage.Height;   
     }

     Cursor = Cursors.Default;

     _drawStarted = false;
}

Answer 1

我需要找到滚动条的位置。这是MouseUp的工作代码：

private void pictureEdit1_MouseUp(object sender, MouseEventArgs e)
{
       if (e.Button == MouseButtons.Left && _drawStarted && _selection.Size != new Size())
       {
            PictureEditViewInfo viewInfo = originalPictureEdit.GetViewInfo() as PictureEditViewInfo;
            PropertyInfo pr = viewInfo.GetType().GetProperty("HScrollBarPosition", BindingFlags.Instance | BindingFlags.NonPublic);
            int fHScrollBarPosition = (int)pr.GetValue(viewInfo, null);
            pr = viewInfo.GetType().GetProperty("VScrollBarPosition", BindingFlags.Instance | BindingFlags.NonPublic);
            int fVScrollBarPosition = (int)pr.GetValue(viewInfo, null);
            _selection.X += fHScrollBarPosition;
            _selection.Y += fVScrollBarPosition;

            Crop();
        }

        Cursor = Cursors.Default;

        _drawStarted = false;
}

Answer 2

PictureEdit控件可以显示带偏移或缩放的图像，因此您应该在计算中接受这些因素。我相信以下方法可以帮助您：

PictureEditViewInfo viewInfo = GetViewInfo(originalPictureEdit);
Rectangle cropRect = new Rectangle(
    _selection.X - viewInfo.PictureStartX,
    _selection.Y - viewInfo.PictureStartY,
    _selection.Width,
    _selection.Height);
_croppedImage = (originalPictureEdit.Image as Bitmap).Clone(cropRect,
    originalPictureEdit.Image.PixelFormat);
//...
static PictureEditViewInfo GetViewInfo(PictureEdit edit) {
    PropertyInfo pInfo = typeof(BaseEdit).GetProperty("ViewInfo",
        BindingFlags.Instance | BindingFlags.NonPublic);
    return (PictureEditViewInfo)pInfo.GetValue(edit, new object[] { });
}

另外，我建议您使用以下内容替换pictureedit graphich上的直接绘图：

//...
Point frameLocation = originalPictureEdit.PointToScreen(_selection.Location);
ControlPaint.DrawReversibleFrame(
    new Rectangle(frameLocation, _selection.Size), Color.Black, FrameStyle.Dashed);

Devexpress PictureEdit裁剪问题

2 个答案: