{
BackgroundImage = Image.FromFile(@"D:\heart.bmp");//前景图加载图片
FormBorderStyle = FormBorderStyle.None; //设置风格
BackgroundImageLayout = ImageLayout.None; //设置图片排列风格
Color c = Color.Blue; //设置背景色
BackColor = c;
TransparencyKey = c;
Width = BackgroundImage.Width; //设置长宽
Height = BackgroundImage.Height;
//BitmapRegion BitmapRegion = new BitmapRegion();//此为生成不规则窗体和控件的类
//BitmapRegion.CreateControlRegion(this, new Bitmap(@"D:\heart.bmp"));
}
2.添加最大化最小化关闭按钮，并写响应事件
private void button1_Click(object sender, EventArgs e)
{
if (this.WindowState == FormWindowState.Maximized)//如果已经最大化
this.WindowState = FormWindowState.Normal;//窗口正常大小
else
this.WindowState = FormWindowState.Maximized; //窗口最大化
}
private void button3_Click(object sender, EventArgs e)
{
this.WindowState = FormWindowState.Minimized;//窗口最小化
}
private void button2_Click(object sender, EventArgs e)
{
this.Close();//关闭
3.添加拖拽功能（会有跳动现象）
添加公共变量
private Point mouseOffset; //记录鼠标指针的坐标
private bool isMouseDown = false; //记录鼠标按键是否按下
private void Form3_MouseDown(object sender, MouseEventArgs e)
{
int xOffset;
int yOffset;
if (e.Button == MouseButtons.Left)
{
xOffset = -e.X - SystemInformation.FrameBorderSize.Width;
yOffset = -e.Y - SystemInformation.CaptionHeight - SystemInformation.FrameBorderSize.Height;
mouseOffset = new Point(xOffset, yOffset);
isMouseDown = true;
}
}
private void Form3_MouseMove(object sender, MouseEventArgs e)
{
if (isMouseDown)
{
Point mousePos = Control.MousePosition;
mousePos.Offset(mouseOffset.X, mouseOffset.Y);
Location = mousePos;
}
}
private void Form3_MouseUp(object sender, MouseEventArgs e)
{
// 修改鼠标状态isMouseDown的值
// 确保只有鼠标左键按下并移动时，才移动窗体
if (e.Button == MouseButtons.Left)
{
isMouseDown = false;
}
}
3.2 拖拽功能（无跳动现象）
'Win32 API
Declare Auto Function ReleaseCapture Lib "user32.dll" Alias "ReleaseCapture" () As Boolean
Declare Auto Function SendMessage Lib "user32.dll" Alias "SendMessage" (ByVal hWnd As IntPtr, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As IntPtr
'Win32 Message
Private Const WM_SYSCOMMAND As Integer = &H112&
Private Const SC_MOVE As Integer = &HF010&
Private Const HTCAPTION As Integer = &H2&
Private Sub frmLogin_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove
If e.Button = MouseButtons.Left Then
ReleaseCapture()
SendMessage(Me.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0)
End If
End Sub
附录
类（其实不太好用）
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
using System.Text;
namespace WindowsFormsApplication1
{
public class BitmapRegion
{
public BitmapRegion()
{ }
///<summary>
///Create and apply the region on the supplied control
///创建支持位图区域的控件（目前有button和form）
///</summary>
///<param name="control">The Control object to apply the region to控件</param>
///<param name="bitmap">The Bitmap object to create the region from位图</param>
public static void CreateControlRegion(Control control, Bitmap bitmap)
{
// Return if control and bitmap are null
//判断是否存在控件和位图
if (control == null || bitmap == null)
return;
// Set our control''s size to be the same as the bitmap
//设置控件大小为位图大小
control.Width = bitmap.Width;
control.Height = bitmap.Height;
// Check if we are dealing with Form here
//当控件是form时
if (control is System.Windows.Forms.Form)
{
// Cast to a Form object
//强制转换为FORM
Form form = (Form)control;
// Set our form''s size to be a little larger that the bitmap just
// in case the form''s border style is not set to none in the first place
//当FORM的边界FormBorderStyle不为NONE时，应将FORM的大小设置成比位图大小稍大一点
form.Width = control.Width;
form.Height = control.Height;
// No border
//没有边界
form.FormBorderStyle = FormBorderStyle.None;
// Set bitmap as the background image
//将位图设置成窗体背景图片 http://www.mscto.com
form.BackgroundImage = bitmap;
// Calculate the graphics path based on the bitmap supplied
//计算位图中不透明部分的边界
GraphicsPath graphicsPath = CalculateControlGraphicsPath(bitmap);
// Apply new region
//应用新的区域
form.Region = new Region(graphicsPath);
}
// Check if we are dealing with Button here
//当控件是button时
else if (control is System.Windows.Forms.Button)
{
// Cast to a button object
//强制转换为 button
Button button = (Button)control;
// Do not show button text
//不显示button text
button.Text = "";
// Change cursor to hand when over button
//改变 cursor的style
button.Cursor = Cursors.Hand;
// Set background image of button
//设置button的背景图片
button.BackgroundImage = bitmap;
// Calculate the graphics path based on the bitmap supplied
//计算位图中不透明部分的边界
GraphicsPath graphicsPath = CalculateControlGraphicsPath(bitmap);
// Apply new region
//应用新的区域
button.Region = new Region(graphicsPath);
}
}
///<summary>
/// Calculate the graphics path that representing the figure in the bitmap
/// excluding the transparent color which is the top left pixel.
/// 计算位图中不透明部分的边界
///</summary>
///<param name="bitmap">The Bitmap object to calculate our graphics path from</param>
///<returns>Calculated graphics path</returns>
private static GraphicsPath CalculateControlGraphicsPath(Bitmap bitmap)
{
// Create GraphicsPath for our bitmap calculation
//创建 GraphicsPath
GraphicsPath graphicsPath = new GraphicsPath();
// Use the top left pixel as our transparent color
//使用左上角的一点的颜色作为我们透明色
Color colorTransparent = bitmap.GetPixel(0, 0);
// This is to store the column value where an opaque pixel is first found.
// This value will determine where we start scanning for trailing opaque pixels.
//第一个找到点的X
int colOpaquePixel = 0;
// Go through all rows (Y axis)
// 偏历所有行（Y方向）
for (int row = 0; row < bitmap.Height; row++)
{
// Reset value
//重设
colOpaquePixel = 0;
// Go through all columns (X axis)
//偏历所有列（X方向）
for (int col = 0; col < bitmap.Width; col++)
{
// If this is an opaque pixel, mark it and search for anymore trailing behind
//如果是不需要透明处理的点则标记，然后继续偏历
if (bitmap.GetPixel(col, row) != colorTransparent)
{
// Opaque pixel found, mark current position
//记录当前
colOpaquePixel = col;
// Create another variable to set the current pixel position
//建立新变量来记录当前点
int colNext = col;
// Starting from current found opaque pixel, search for anymore opaque pixels
// trailing behind, until a transparent pixel is found or minimum width is reached
//从找到的不透明点开始，继续寻找不透明点,一直到找到或则达到图片宽度
for (colNext = colOpaquePixel; colNext < bitmap.Width; colNext++)
if (bitmap.GetPixel(colNext, row) == colorTransparent)
break;
// Form a rectangle for line of opaque pixels found and add it to our graphics path
//将不透明点加到graphics path
graphicsPath.AddRectangle(new Rectangle(colOpaquePixel, row, colNext - colOpaquePixel, 1));
// No need to scan the line of opaque pixels just found
col = colNext;
}
}
}
// Return calculated graphics path
return graphicsPath;
}
}
}