protected virtual void OnMouseMove(object sender, MouseEventArgs e)
{
if (_clickedPoint == null)
{
return;
}
var p = _transformation.ConvertToIm((Size)e.Location);
Transformation = _transformation.SetTranslate(_clickedPoint.Value - p);
Invalidate();
}
/// <summary>
/// 修正大小，防止太大或者太小
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
private ProTransformation FixTranslation(ProTransformation value)
{
double maxScale = CalcFitScale(); //最大缩小到跟边框一样大小
if (value.Scale > maxScale)
{
value = value.SetScale(maxScale);
}
if (value.Scale < 0.3)
{
value = value.SetScale(0.3);
}
var rectSize = value.ConvertToIm(ClientRectangle.Size);
var max = new Size(Image.Width - rectSize.Width, Image.Height - rectSize.Height);
value = value.SetTranslate((new Point(Math.Min(value.Translation.X, max.Width), Math.Min(value.Translation.Y, max.Height))));
if (value.Translation.X < 0 || value.Translation.Y < 0)
{
value = value.SetTranslate(new Point(Math.Max(value.Translation.X, 0), Math.Max(value.Translation.Y, 0)));
}
return(value);
}