/// <summary> 工作区域滚动条事件<para />
/// 1、生成绘图区域背景和绘图图片<para />
/// 2、绘制显示区域内的元素
/// </summary>
private void ScrollBar_Scroll(object sender, ScrollEventArgs e)
{
if (null != picWorkArea.BackgroundImage)
{
((IDisposable)picWorkArea.BackgroundImage).Dispose();
}
if (null != sender)
{
switch ((sender as Control).Name)
{
default: { break; }
case "hscWScroll":
{
_wa.ViewSize = new Rectangle(e.NewValue, _wa.ViewSize.Location.Y, picWorkArea.Width, picWorkArea.Height);
break;
}
case "vscWScroll":
{
_wa.ViewSize = new Rectangle(_wa.ViewSize.Location.X, e.NewValue, picWorkArea.Width, picWorkArea.Height);
break;
}
}
}
else
{
_wa.ViewSize = new Rectangle(hscWScroll.Value, vscWScroll.Value, picWorkArea.Width, picWorkArea.Height);
}
picWorkArea.BackgroundImage = _wa.CreateBackground();
CreateDrawArea();
using (Graphics gp = Graphics.FromImage(picWorkArea.Image))
{
_wa.GetDrawElement();
_wa.DrawElement(gp, Point.Empty, ElementType.None);
}
if (!Point.Empty.Equals(_mldpoint) && null != sender)
{
switch ((sender as Control).Name)
{
default: { break; }
case "hscWScroll":
{
_mldpoint.X += e.OldValue - e.NewValue;
break;
}
case "vscWScroll":
{
_mldpoint.Y += e.OldValue - e.NewValue;
break;
}
}
}
}
