x一、定义如下变量，用于标志当前图形缩放大小
private MenuItem Small1;
private MenuItem Small2;
private MenuItem Medium1;
private MenuItem Medium2;
private MenuItem Large;
二、向右键菜单的contextMenu1中增加菜单项
contextMenu1.MenuItems.Add("保存图形", new EventHandler(this.Right_Clicked));
contextMenu1.MenuItems.Add("打印图形", new EventHandler(this.Right_Clicked));
contextMenu1.MenuItems.Add("打印预览", new EventHandler(this.Right_Clicked));
Small1 = new MenuItem("60", new EventHandler(this.Right_Clicked));
Small2 = new MenuItem("70", new EventHandler(this.Right_Clicked));
Medium1 = new MenuItem("80", new EventHandler(this.Right_Clicked));
Medium2 = new MenuItem("90", new EventHandler(this.Right_Clicked));
Large = new MenuItem("100", new EventHandler(this.Right_Clicked));
Large.Checked = true ;
Large.DefaultItem = true ;
contextMenu1.MenuItems.Add( "缩放大小",(new MenuItem[]{ Small1,Small2,Medium1,Medium2, Large }) );
contextMenu1.MenuItems.Add("-");
contextMenu1.MenuItems.Add("关闭", new EventHandler(this.Right_Clicked));
三、增加右键菜单的事件处理程序
/// <summary>
/// 说明：弹出式菜单项处理程序
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Right_Clicked(object sender, System.EventArgs e)
{
MenuItem miClicked = (MenuItem)sender;
string strMenu = ((MenuItem)sender).Text;
if (strMenu == "保存图形")
{
GraphicSave();
}
else if (strMenu == "打印图形")
{
graphicPrint();
}
else if (strMenu == "打印预览")
{
prePrint();
}
else if (strMenu == "关闭")
{
this.Close();
}
else if (strMenu == "60")
{
if (imagemap != null)
{
Large.Checked = false;
Small1.Checked = true;
Small2.Checked = false;
Medium1.Checked = false;
Medium2.Checked = false;
curZoom = (double)60/100;
Invalidate();
}
}
else if (strMenu == "70")
{
if (imagemap != null)
{
Large.Checked = false;
Small1.Checked = false;
Small2.Checked = true;
Medium1.Checked = false;
Medium2.Checked = false;
curZoom = (double)70/100;
Invalidate();
}
}
else if (strMenu == "80")
{
if (imagemap != null)
{
Large.Checked = false;
Small1.Checked = false;
Small2.Checked = false;
Medium1.Checked = true;
Medium2.Checked = false;
curZoom = (double)80/100;
Invalidate();
}
}
else if (strMenu == "90")
{
if (imagemap != null)
{
Large.Checked = false;
Small1.Checked = false;
Small2.Checked = false;
Medium1.Checked = false;
Medium2.Checked = true;
curZoom = (double)90/100;
Invalidate();
}
}
else if (strMenu == "100")
{
if (imagemap != null)
{
Large.Checked = true;
Small1.Checked = false;
Small2.Checked = false;
Medium1.Checked = false;
Medium2.Checked = false;
curZoom = (double)100/100;
Invalidate();
}
}
else
{
return;
}
}
