类型：转载 责任编辑：asp.net 日期：2007/05/23
热门软件下载：
看原码，当我点击按钮时我想让指定矩形重化，其他不画，可Invalidate（rect）函数好象没起作用，不该重画的都画出来了。
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace WindowsApplication4
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
private System.Windows.Forms.Button button1;
bool bdraw = false;
Graphics m_gh;
public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(232, 64);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(40, 24);
this.button1.TabIndex = 0;
this.button1.Text = "button1";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
m_gh.DrawRectangle(Pens.Blue,10,10,10,10);
if (bdraw)
{
m_gh.FillRectangle(Brushes.Red,30,30,10,10);
}
}
private void button1_Click(object sender, System.EventArgs e)
{
bdraw = true;
//this.Invalidate();
Point[] pt = new Point[2];
pt[0] = new Point(10,10);
pt[1] = new Point(20,20);
m_gh.TransformPoints(CoordinateSpace.Device,CoordinateSpace.World,pt);
this.Invalidate(new Rectangle(pt[0].X,pt[0].Y,pt[1].X-pt[0].X,pt[1].Y-pt[0].Y));
}
private void Form1_Load(object sender, System.EventArgs e)
{
m_gh = this.CreateGraphics();
m_gh.PageScale = 0.1f;
m_gh.PageUnit = GraphicsUnit.Millimeter;
}
}
}
网友回答：
ding