C#實現GDI+基本圖的縮放、拖拽、移動示例代碼如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace ResizableControls
{
public partial class MainForm : Form
{
/// <summary>
/// 有關鼠標樣式的相關枚舉
/// </summary>
private enum EnumMousePointPosition
{
MouseSizeNone = 0, //無
MouseSizeRight = 1, //拉伸右邊框
MouseSizeLeft = 2, //拉伸左邊框
MouseSizeBottom = 3, //拉伸下邊框
MouseSizeTop = 4, //拉伸上邊框
MouseSizeTopLeft = 5,//拉伸左上角
MouseSizeTopRight = 6,//拉伸右上角
MouseSizeBottomLeft = 7,//拉伸左下角
MouseSizeBottomRight = 8,//拉伸右下角
MouseDrag = 9 //鼠標拖動
}
const int Band = 5;//范圍半徑
const int MinWidth = 10;//最低寬度
const int MinHeight = 10;//最低高度
private EnumMousePointPosition m_MousePointPosition; //鼠標樣式枚舉
private Point m_lastPoint; //光標上次移動的位置
private Point m_endPoint; //光標移動的當前位置
public MainForm()
{
InitializeComponent();
//窗體中控件的事件晚期綁定
for (int i = 0; i < this.Controls.Count; i++)
{
this.Controls[i].MouseDown += new MouseEventHandler(MyMouseDown);
this.Controls[i].MouseLeave += new EventHandler(MyMouseLeave);
this.Controls[i].MouseMove += new MouseEventHandler(MyMouseMove);
}
}
//鼠標按下事件
private void MyMouseDown(object sender,MouseEventArgs e)
{
m_lastPoint.X = e.X;
m_lastPoint.Y = e.Y;
m_endPoint.X = e.X;
m_endPoint.Y = e.Y;
}
//鼠標離開控件的事件
private void MyMouseLeave(object sender, System.EventArgs e)
{
m_MousePointPosition = EnumMousePointPosition.MouseSizeNone;
this.Cursor = Cursors.Arrow;
}
//鼠標移過控件的事件
private void MyMouseMove(object sender, MouseEventArgs e)
{
Control lCtrl = (sender as Control);//獲得事件源
//左鍵按下移動
if (e.Button == MouseButtons.Left)
{
switch (m_MousePointPosition)
{
case EnumMousePointPosition.MouseDrag:
lCtrl.Left = lCtrl.Left + e.X - m_lastPoint.X;
lCtrl.Top = lCtrl.Top + e.Y - m_lastPoint.Y;
break;
case EnumMousePointPosition.MouseSizeBottom:
lCtrl.Height = lCtrl.Height + e.Y - m_endPoint.Y;
m_endPoint.X = e.X;
m_endPoint.Y = e.Y; //記錄光標拖動的當前點 break;
case EnumMousePointPosition.MouseSizeBottomRight:
lCtrl.Width = lCtrl.Width + e.X - m_endPoint.X;
lCtrl.Height = lCtrl.Height + e.Y - m_endPoint.Y;
m_endPoint.X = e.X;
m_endPoint.Y = e.Y; //記錄光標拖動的當前點 break;
case EnumMousePointPosition.MouseSizeRight:
lCtrl.Width = lCtrl.Width + e.X - m_endPoint.X;
//lCtrl.Height = lCtrl.Height + e.Y - m_endPoint.Y;
m_endPoint.X = e.X;
m_endPoint.Y = e.Y; //記錄光標拖動的當前點
break;
case EnumMousePointPosition.MouseSizeTop:
lCtrl.Top = lCtrl.Top + (e.Y - m_lastPoint.Y);
lCtrl.Height = lCtrl.Height - (e.Y - m_lastPoint.Y); break;
case EnumMousePointPosition.MouseSizeLeft:
lCtrl.Left = lCtrl.Left + e.X - m_lastPoint.X;
lCtrl.Width = lCtrl.Width - (e.X - m_lastPoint.X); break;
case EnumMousePointPosition.MouseSizeBottomLeft:
lCtrl.Left = lCtrl.Left + e.X - m_lastPoint.X;
lCtrl.Width = lCtrl.Width - (e.X - m_lastPoint.X);
lCtrl.Height = lCtrl.Height + e.Y - m_endPoint.Y;
m_endPoint.X = e.X;
m_endPoint.Y = e.Y; //記錄光標拖動的當前點
break;
case EnumMousePointPosition.MouseSizeTopRight:
lCtrl.Top = lCtrl.Top + (e.Y - m_lastPoint.Y);
lCtrl.Width = lCtrl.Width + (e.X - m_endPoint.X);
lCtrl.Height = lCtrl.Height - (e.Y - m_lastPoint.Y);
m_endPoint.X = e.X;
m_endPoint.Y = e.Y; //記錄光標拖動的當前點 break;
case EnumMousePointPosition.MouseSizeTopLeft:
lCtrl.Left = lCtrl.Left + e.X - m_lastPoint.X;
lCtrl.Top = lCtrl.Top + (e.Y - m_lastPoint.Y);
lCtrl.Width = lCtrl.Width - (e.X - m_lastPoint.X);
lCtrl.Height = lCtrl.Height - (e.Y - m_lastPoint.Y);
break;
default:
break;
}
if (lCtrl.Width < MinWidth) lCtrl.Width = MinWidth;
if (lCtrl.Height < MinHeight) lCtrl.Height = MinHeight;
}
else
{
//'判斷光標的位置狀態
m_MousePointPosition = MousePointPosition(lCtrl.Size, e); switch (m_MousePointPosition) //改變光標
{
case EnumMousePointPosition.MouseSizeNone:
this.Cursor = Cursors.Arrow;//箭頭
break;
case EnumMousePointPosition.MouseDrag:
this.Cursor = Cursors.SizeAll;//四方向
break;
case EnumMousePointPosition.MouseSizeBottom:
this.Cursor = Cursors.SizeNS;//南北
break;
case EnumMousePointPosition.MouseSizeTop:
this.Cursor = Cursors.SizeNS;//南北
break;
case EnumMousePointPosition.MouseSizeLeft:
this.Cursor = Cursors.SizeWE;//東西
break;
case EnumMousePointPosition.MouseSizeRight:
this.Cursor = Cursors.SizeWE;//東西
break;
case EnumMousePointPosition.MouseSizeBottomLeft:
this.Cursor = Cursors.SizeNESW;//東北到南西
break;
case EnumMousePointPosition.MouseSizeBottomRight:
this.Cursor = Cursors.SizeNWSE;//東南到西北
break;
case EnumMousePointPosition.MouseSizeTopLeft:
this.Cursor = Cursors.SizeNWSE;//東南到西北
break;
case EnumMousePointPosition.MouseSizeTopRight:
this.Cursor = Cursors.SizeNESW;//東北到南西
break;
default:
break;
}
}
}
//坐標位置判定
private EnumMousePointPosition MousePointPosition(Size size, System.Windows.Forms.MouseEventArgs e)
{
if ((e.X >= -1 * Band) | (e.X <= size.Width) |
(e.Y >= -1 * Band) | (e.Y <= size.Height))
{
if (e.X < Band)
{
if (e.Y < Band)
{
return EnumMousePointPosition.MouseSizeTopLeft;
}
else
{
if (e.Y > -1 * Band + size.Height)
{
return EnumMousePointPosition.MouseSizeBottomLeft;
}
else
{
return EnumMousePointPosition.MouseSizeLeft;
}
}
}
else
{
if (e.X > -1 * Band + size.Width)
{
if (e.Y < Band)
{ return EnumMousePointPosition.MouseSizeTopRight; }
else
{
if (e.Y > -1 * Band + size.Height)
{ return EnumMousePointPosition.MouseSizeBottomRight; }
else
{ return EnumMousePointPosition.MouseSizeRight; }
}
}
else
{
if (e.Y < Band)
{ return EnumMousePointPosition.MouseSizeTop; }
else
{
if (e.Y > -1 * Band + size.Height)
{ return EnumMousePointPosition.MouseSizeBottom; }
else
{ return EnumMousePointPosition.MouseDrag; }
}
}
}
}
else
{ return EnumMousePointPosition.MouseSizeNone; }
}
}
}
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