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The author:(作者)qq
published in(发表于) 2014/7/11 9:22:50
C#教程：MouseMove事件使用实例

C#教程：MouseMove事件使用实例|方法

MouseMove事件

当鼠标指针移到控件上时发生MouseMove事件。

语法：

public event MouseEventHandler MouseMove

示例

MouseMove事件的使用

本示例实现的是在窗体的鼠标MouseMove事件中，实现画板功能。示例运行结果如图1所示。



图1 MouseMove事件的使用

private void Form1_MouseMove(object sender, MouseEventArgs e)

{

if (lastPoint.Equals(Point.Empty))

{ lastPoint = new Point(e.X, e.Y); }

if (OnMouseDown)

{

Point cruuPoint = new Point(e.X, e.Y);

graphics.DrawLine(pen, cruuPoint, lastPoint);

}

lastPoint = new Point(e.X, e.Y);

}

完整程序代码如下：

★ ★★★★frmMouse.cs窗体代码文件完整程序代码★★★★★

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace _2_05

{

public partial class frmMouse : Form

{

public frmMouse()

{

InitializeComponent();

pen = new Pen(Color.FromName(G_str_color));//始末画笔

graphics = CreateGraphics();//初始画板

}

public bool G_OnMouseDown = false;

public Point lastPoint = Point.Empty;

public string G_str_color = "black";

public Pen pen;

public Graphics graphics;

//当你拖拽鼠标处理的和序,当没有上一点时,你目当所按下的点就是上一个点

//目当所按下的点就是CurrPoint,使用您所选反背景色画笔pen从lastPointi画一条直线,然后将

//上一个点LastPoint的值设为目前点currPoint

private void Form1_MouseMove(object sender, MouseEventArgs e)

{

if (lastPoint.Equals(Point.Empty))

{ lastPoint = new Point(e.X, e.Y); }

if (G_OnMouseDown)

{

Point cruuPoint = new Point(e.X, e.Y);

graphics.DrawLine(pen, cruuPoint, lastPoint);

}

lastPoint = new Point(e.X, e.Y);

}

//当鼠标离开时把布尔变量设为false;

private void Form1_MouseUp(object sender, MouseEventArgs e)

{

G_OnMouseDown = false;

}

//将布尔变量OnMouseDown设为true 按下鼠标右键时显示菜单

private void Form1_MouseDown(object sender, MouseEventArgs e)

{

G_OnMouseDown = true;

if (e.Button == MouseButtons.Right)

{

this.contextMenuStrip1.Show(this, new Point(e.X, e.Y));

}

}

#region 获取背景色名称后转成Color对象充当Pen构造函数的自变量,用于创建画笔对象Pen

private void whiteToolStripMenuItem_Click(object sender, EventArgs e)

{

G_str_color = ((ToolStripMenuItem)sender).Text;

pen = new Pen(Color.FromName(G_str_color));

}

private void redToolStripMenuItem_Click(object sender, EventArgs e)

{

G_str_color = ((ToolStripMenuItem)sender).Text;

pen = new Pen(Color.FromName(G_str_color));

}

private void greenToolStripMenuItem_Click(object sender, EventArgs e)

{

G_str_color = ((ToolStripMenuItem)sender).Text;

pen = new Pen(Color.FromName(G_str_color));

}

private void blackToolStripMenuItem_Click(object sender, EventArgs e)

{

G_str_color = ((ToolStripMenuItem)sender).Text;

pen = new Pen(Color.FromName(G_str_color));

}

private void blueToolStripMenuItem_Click(object sender, EventArgs e)

{

G_str_color = ((ToolStripMenuItem)sender).Text;

pen = new Pen(Color.FromName(G_str_color));

}

#endregion

private void frmMouse_Load(object sender, EventArgs e)

{

}

}

}

★ ★★★★frmMouse.Designer.cs窗体设计文件完整程序代码★★★★★

namespace _2_05

{

partial class frmMouse

{

///

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