这是三年前研究C#与GDI+时的作品，它使用C#与GDI+绘制一把有透明度、带刻度 (以像素为单位)的直尺。
最终效果：
横向直尺：（注：设置了80%不透明度）
竖向直尺：（注：设置了100%不透明度，即完全不透明）
C#代码：
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Resources;
using System.Windows.Forms;namespace BrawDraw.Com.Utility.Ruler
{
public class BeautifulRuler : Form
{
private ToolTip _toolTip = new ToolTip();
private Point _offset;
private Rectangle _mouseDownRect;
private int _resizeBorderWidth = 5;
private Point _mouseDownPoint;
private ResizeRegion _resizeRegion = ResizeRegion.None;
private ContextMenu _menu = new ContextMenu();
private MenuItem _verticalMenuItem;
private MenuItem _toolTipMenuItem;
private static bool showWidth = true;
private static bool showWebSite = true;
private const string SHORT_WEBSITE_STRING="BrawDraw.Com";
private const string FULL_WEBSITE_STRING="http://www.BrawDraw.Com";
private string _webSiteString;
private Color _webSiteStringColor; #region ResizeRegion enum
private enum ResizeRegion
{
None, N, NE, E, SE, S, SW, W, NW
}
#endregion public BeautifulRuler()
{
InitializeComponent(); ResourceManager resources = new ResourceManager(typeof(BeautifulRuler));
Icon = ((Icon)(resources.GetObject("$this.Icon"))); SetUpMenu();
Text = "Ruler";
BackColor = Color.White;
ClientSize = new Size(400, 75);
FormBorderStyle = FormBorderStyle.None;
Opacity = 0.75;
ContextMenu = _menu;
Font = new Font("Tahoma", 10); _webSiteStringColor = Color.Blue;
SetStyle(ControlStyles.DoubleBuffer | ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
this.TopMost = true;
} public string WebSiteString
{
get
{
if (_webSiteString == null)
{
_webSiteString = FULL_WEBSITE_STRING;
}
return _webSiteString;
}
set
{
value = _webSiteString;
}
} public Color WebSiteStringColor
{
get
{
if (_webSiteStringColor == Color.Empty)
{
_webSiteStringColor = Color.Black;
}
return _webSiteStringColor;
}
set
{
value = _webSiteStringColor;
}
}
private bool IsVertical
{
get { return _verticalMenuItem.Checked; }
set { _verticalMenuItem.Checked = value; }
} private bool ShowToolTip
{
get { return _toolTipMenuItem.Checked; }
set
{
_toolTipMenuItem.Checked = value;
if (value)
{
SetToolTip();
}
}
} private void SetUpMenu()
{
AddMenuItem("保持最顶层");
_verticalMenuItem = AddMenuItem("竖向尺子");
_toolTipMenuItem = AddMenuItem("工具提示"); //默认光标停留时显示尺寸大小
_toolTipMenuItem.Checked = true; MenuItem opacityMenuItem = AddMenuItem("透明度");
AddMenuItem("-");
AddMenuItem("退出"); for (int i = 10; i <= 100; i += 10)
{
MenuItem subMenu = new MenuItem(i + "%");
subMenu.Click += new EventHandler(OpacityMenuHandler);
opacityMenuItem.MenuItems.Add(subMenu);
}
} private MenuItem AddMenuItem(string text)
{
return AddMenuItem(text, Shortcut.None);
} private MenuItem AddMenuItem(string text, Shortcut shortcut)
{
MenuItem mi = new MenuItem(text);
mi.Click += new EventHandler(MenuHandler);
mi.Shortcut = shortcut;
_menu.MenuItems.Add(mi);
return mi;
} protected override void OnMouseDown(MouseEventArgs e)
{
_offset = new Point(MousePosition.X - Location.X, MousePosition.Y - Location.Y);
_mouseDownPoint = MousePosition;
_mouseDownRect = ClientRectangle; base.OnMouseDown(e);
} protected override void OnMouseUp(MouseEventArgs e)
{
_resizeRegion = ResizeRegion.None;
base.OnMouseUp(e);
} protected override void OnMouseMove(MouseEventArgs e)
{
if (_resizeRegion != ResizeRegion.None)
{
HandleResize();
return;
} Point clientCursorPos = PointToClient(MousePosition);
Rectangle resizeInnerRect = ClientRectangle;
resizeInnerRect.Inflate(-_resizeBorderWidth, -_resizeBorderWidth); bool inResizableArea = ClientRectangle.Contains(clientCursorPos) && !resizeInnerRect.Contains(clientCursorPos);
if (inResizableArea)
{
ResizeRegion resizeRegion = GetResizeRegion(clientCursorPos);
SetResizeCursor(resizeRegion); if (e.Button == MouseButtons.Left)
{
_resizeRegion = resizeRegion;
HandleResize();
}
}
else
{
Cursor = Cursors.Default; if (e.Button == MouseButtons.Left)
{
Location = new Point(MousePosition.X - _offset.X, MousePosition.Y - _offset.Y);
}
} base.OnMouseMove(e);
} protected override void OnResize(EventArgs e)
{
if (ShowToolTip)
{
SetToolTip();
} base.OnResize(e);
} private void SetToolTip()
{
_toolTip.SetToolTip(this, string.Format("宽度: {0} 像素/n高度: {1} 像素", Width, Height));
} protected override void OnKeyDown(KeyEventArgs e)
{
switch (e.KeyCode)
{
case Keys.Right:
case Keys.Left:
case Keys.Up:
case Keys.Down:
HandleMoveResizeKeystroke(e);
break; case Keys.Space:
ChangeOrientation();
break;
} base.OnKeyDown(e);
} private void HandleMoveResizeKeystroke(KeyEventArgs e)
{
if (e.KeyCode == Keys.Right)
{
if (e.Control)
{
if (e.Shift)
{
Width += 1;
}
else
{
Left += 1;
}
}
else
{
Left += 5;
}
}
else if (e.KeyCode == Keys.Left)
{
if (e.Control)
{
if (e.Shift)
{
Width -= 1;
}
else
{
Left -= 1;
}
}
else
{
Left -= 5;
}
}
else if (e.KeyCode == Keys.Up)
{
if (e.Control)
{
if (e.Shift)
{
Height -= 1;
}
else
{
Top -= 1;
}
}
else
{
Top -= 5;
}
}
else if (e.KeyCode == Keys.Down)
{
if (e.Control)
{
if (e.Shift)
{
Height += 1;
}
else
{
Top += 1;
}
}
else
{
Top += 5;
}
}
} private void HandleResize()
{
int diff = 0;
switch (_resizeRegion)
{
case ResizeRegion.E:
diff = MousePosition.X - _mouseDownPoint.X;
Width = _mouseDownRect.Width + diff;
break; case ResizeRegion.S:
diff = MousePosition.Y - _mouseDownPoint.Y;
Height = _mouseDownRect.Height + diff;
break; case ResizeRegion.SE:
Width = _mouseDownRect.Width + MousePosition.X - _mouseDownPoint.X;
Height = _mouseDownRect.Height + MousePosition.Y - _mouseDownPoint.Y;
break; case ResizeRegion.NW:
Width = _mouseDownRect.Width - MousePosition.X + _mouseDownPoint.X;
Height = _mouseDownRect.Height - MousePosition.Y + _mouseDownPoint.Y;
break; default:
break;
}
int tmp;
int height=Height;
int width=Width;
if (IsVertical)
{
tmp = Height;
height = Width;
width = tmp;
}
//当窗口过小时，保持一定大小
if(Width<30) Width=30;
if(Height<20) Height=20; if(height<30)
{
showWidth=false;
}
else
{
showWidth=true;
} if(height>66 && (width>60 && width<200))
{
showWebSite=true;
_webSiteString = SHORT_WEBSITE_STRING;
}
else if(height<66 || width<40)
{
showWebSite=false;
_webSiteString = FULL_WEBSITE_STRING;
}
else
{
showWebSite=true;
_webSiteString = FULL_WEBSITE_STRING;
} this.Invalidate();
} private void SetResizeCursor(ResizeRegion region)
{
switch (region)
{
case ResizeRegion.N:
case ResizeRegion.S:
Cursor = Cursors.SizeNS;
break;
case ResizeRegion.E:
case ResizeRegion.W:
Cursor = Cursors.SizeWE;
break; case ResizeRegion.NW:
case ResizeRegion.SE:
Cursor = Cursors.SizeNWSE;
break; default:
Cursor = Cursors.SizeNESW;
break;
}
} private ResizeRegion GetResizeRegion(Point clientCursorPos)
{
if (clientCursorPos.Y <= _resizeBorderWidth)
{
if (clientCursorPos.X <= _resizeBorderWidth) return ResizeRegion.NW;
else if (clientCursorPos.X >= Width - _resizeBorderWidth) return ResizeRegion.NE;
else return ResizeRegion.N;
}
else if (clientCursorPos.Y >= Height - _resizeBorderWidth)
{
if (clientCursorPos.X <= _resizeBorderWidth) return ResizeRegion.SW;
else if (clientCursorPos.X >= Width - _resizeBorderWidth) return ResizeRegion.SE;
else return ResizeRegion.S;
}
else
{
if (clientCursorPos.X <= _resizeBorderWidth) return ResizeRegion.W;
else return ResizeRegion.E;
}
} protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
Graphics graphics = e.Graphics;
int height = Height;
int width = Width; if (IsVertical)
{
graphics.RotateTransform(90);
graphics.TranslateTransform(0, -Width + 1);
height = Width;
width = Height;
} LinearGradientBrush lgb=new LinearGradientBrush(
new Point(0,0),
new Point(0,height),
Color.Black,
Color.White
);
//定义参与渐变的色彩
Color[] colors=
{
Color.White,
Color.White,
Color.FromArgb(228,232,238),
Color.FromArgb(202,212,222),
Color.FromArgb(228,232,238),
Color.White,
Color.White
};
float[] positions=
{
0.0f,
0.1f,
0.36f,
0.5f,
0.64f,
0.9f,
1.0f
};
ColorBlend clrBlend = new ColorBlend();
clrBlend.Colors=colors;
clrBlend.Positions=positions;
lgb.InterpolationColors=clrBlend; graphics.FillRectangle(lgb,0,0,width,height);
DrawRuler(graphics, width, height);
} private void DrawRuler(Graphics g, int formWidth, int formHeight)
{
// 边框
g.DrawRectangle(Pens.Black, 0, 0, formWidth - 1, formHeight - 1);
// 宽度
if(showWidth)
{
g.DrawString(formWidth + " 像素", Font, Brushes.Black, 10, (formHeight / 2) - (Font.Height / 2));
}
// 显示站点
if(showWebSite)
{
g.DrawString(WebSiteString, Font,new SolidBrush(WebSiteStringColor), 80, (formHeight / 2) - (Font.Height / 2));
} // 刻度
for (int i = 0; i < formWidth; i++)
{
if (i % 2 == 0)
{
int tickHeight;
if (i % 100 == 0)
{
tickHeight = 15;
DrawTickLabel(g, i.ToString(), i, formHeight, tickHeight);
}
else if (i % 10 == 0)
{
tickHeight = 10;
}
else
{
tickHeight = 5;
}
DrawTick(g, i, formHeight, tickHeight);
}
}
} private void DrawTick(Graphics g, int xPos, int formHeight, int tickHeight)
{
// 顶部
g.DrawLine(Pens.Black, xPos, 0, xPos, tickHeight); // 底部
g.DrawLine(Pens.Black, xPos, formHeight, xPos, formHeight - tickHeight);
} private void DrawTickLabel(Graphics g, string text, int xPos, int formHeight, int height)
{
// 顶部数字
g.DrawString(text, Font, Brushes.Black, xPos, height);
// 底部数字
g.DrawString(text, Font, Brushes.Black, xPos, formHeight - height - Font.Height);
} [STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.Run(new BeautifulRuler());
} private void OpacityMenuHandler(object sender, EventArgs e)
{
MenuItem mi = (MenuItem)sender;
Opacity = double.Parse(mi.Text.Replace("%", "")) / 100;
} private void MenuHandler(object sender, EventArgs e)
{
MenuItem mi = (MenuItem)sender;
switch (mi.Text)
{
case "退出":
Close();
break; case "工具提示":
ShowToolTip = !ShowToolTip;
break; case "竖向尺子":
ChangeOrientation();
break; case "保持最顶层":
mi.Checked = !mi.Checked;
TopMost = mi.Checked;
break; default:
MessageBox.Show("未有菜单项目。");
break;
}
} // 改变尺子放置方向（横向/竖向）
private void ChangeOrientation()
{
IsVertical = !IsVertical;
int width = Width;
Width = Height;
Height = width;
this.Invalidate();
} private void InitializeComponent()
{
this.SuspendLayout();
this.ClientSize = new System.Drawing.Size(292, 266);
this.Name = "Form1";
this.DoubleClick += new System.EventHandler(this.Form1_DoubleClick);
this.ResumeLayout(false); }
private void Form1_DoubleClick(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("iexplore.exe", "http://www.b.com");
}
}
}
