价值100分的问题，再没人回答就赠送美女、小车、洋房@x@……

顶你一下,GDI+我也就会画点简单的统计线表

是否这样？
新建一个WinForm项目把所有代码换成下面的代码试试看！using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Drawing2D;namespace 作图2
{
/// <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 Graphics gp;
private Point startP;
private Point endP;
private float[] dot1,dot2;
private System.Timers.Timer timer1;
private bool ft;
private bool dispBJ;
private bool down; public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
gp=this.CreateGraphics();
dot1 =new float [] {2,3,3,3,2,3};
dot2= new float [] {3,3,2,2,3,3};
ft=true;
dispBJ=false;
down =false;
//
// 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.timer1 = new System.Timers.Timer();
((System.ComponentModel.ISupportInitialize)(this.timer1)).BeginInit();
//
// timer1
//
this.timer1.Enabled = true;
this.timer1.Interval = 200;
this.timer1.SynchronizingObject = this;
this.timer1.Elapsed += new System.Timers.ElapsedEventHandler(this.timer1_Elapsed);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(826, 493);
this.Name = "Form1";
this.Text = "Form1";
this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseDown);
this.SizeChanged += new System.EventHandler(this.Form1_SizeChanged);
this.Load += new System.EventHandler(this.Form1_Load);
this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseUp);
this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseMove);
((System.ComponentModel.ISupportInitialize)(this.timer1)).EndInit(); }
#endregion /// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
} private void Form1_Load(object sender, System.EventArgs e)
{

} private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
         startP.X=e.X;
     startP.Y=e.Y;
     dispBJ=false;
gp.Clear(this.BackColor);
     down =true;
} private void Form1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
endP.X=e.X;
endP.Y=e.Y;
dispBJ=true;
down =false;
} private void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
if (!dispBJ) return ;
Pen pp= new Pen(Color.Red,1);
if (ft)
{
ft=false;
pp.DashPattern=dot1;

}
else
{
pp.DashPattern=dot2;
ft=true;

}
pp.DashStyle=DashStyle.Custom;
gp.Clear(this.BackColor);
gp.DrawRectangle(pp,startP.X,startP.Y,endP.X-startP.X ,endP.Y-startP.Y  );
} private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
if (down)
{
endP.X=e.X;
endP.Y=e.Y;
dispBJ=true;
}
} private void Form1_SizeChanged(object sender, System.EventArgs e)
{
gp.Dispose();
gp=this.CreateGraphics();
}
}
}

aQ44(阿Q叔叔) ，我试了你的代码，效果挺好的，但就是它会把背景图清除，而且会让人感觉机器非常缓慢

我们也在模仿QQ里面的抓图。
功能基本上都实现了。
如果有背景图片，就是如你所说的画矩形有点慢，而且鼠标移动快时，也有点闪。
如果没有背景图片，速度效果跟QQ上抓图不相上下。
但是完全可以画出来。而且没有用API。
如果有好的画法，乐意与你共享。
如果你有什么好的方法，乐意与我们共享吗？
期待好的回音……

要加背景为改一下就可以。。
我在我的及其上运行不觉得慢（p4 2.0）
蚂蚁线，我是用timer控制可能慢，你可以用其他方法控制（如线程，我没有试过，只是想法），这里只是达到一个效果，性能你自己优化！using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Drawing2D;namespace 作图2
{
/// <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 Graphics gp;
private Point startP;
private Point endP;
private float[] dot1,dot2;
private System.Timers.Timer timer1;
private bool ft;
private bool dispBJ;
private System.Diagnostics.Process process1;
private System.Windows.Forms.PictureBox pictureBox1;
private bool down; public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//gp=this.CreateGraphics();
gp=pictureBox1.CreateGraphics();

dot1 =new float [] {2,3,3,3,2,3};
dot2= new float [] {3,3,2,2,3,3};
ft=true;
dispBJ=false;
down =false;
//
// 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()
{
System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
this.timer1 = new System.Timers.Timer();
this.process1 = new System.Diagnostics.Process();
this.pictureBox1 = new System.Windows.Forms.PictureBox();
((System.ComponentModel.ISupportInitialize)(this.timer1)).BeginInit();
this.SuspendLayout();
//
// timer1
//
this.timer1.Enabled = true;
this.timer1.Interval = 200;
this.timer1.SynchronizingObject = this;
this.timer1.Elapsed += new System.Timers.ElapsedEventHandler(this.timer1_Elapsed);
//
// process1
//
this.process1.SynchronizingObject = this;
//
// pictureBox1
//
this.pictureBox1.BackColor = System.Drawing.Color.Transparent;
this.pictureBox1.Dock = System.Windows.Forms.DockStyle.Fill;
this.pictureBox1.Location = new System.Drawing.Point(0, 0);
this.pictureBox1.Name = "pictureBox1";
this.pictureBox1.Size = new System.Drawing.Size(826, 493);
this.pictureBox1.TabIndex = 0;
this.pictureBox1.TabStop = false;
this.pictureBox1.MouseUp += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseUp);
this.pictureBox1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseMove);
this.pictureBox1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseDown);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));
this.ClientSize = new System.Drawing.Size(826, 493);
this.Controls.Add(this.pictureBox1);
this.Name = "Form1";
this.Text = "Form1";
this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseDown);
this.SizeChanged += new System.EventHandler(this.Form1_SizeChanged);
this.Load += new System.EventHandler(this.Form1_Load);
this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseUp);
this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseMove);
((System.ComponentModel.ISupportInitialize)(this.timer1)).EndInit();
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_Load(object sender, System.EventArgs e)
{

} private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
         startP.X=e.X;
     startP.Y=e.Y;
     dispBJ=false;
pictureBox1.Refresh();


     down =true;
} private void Form1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
endP.X=e.X;
endP.Y=e.Y;
dispBJ=true;
down =false;
} private void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
if (!dispBJ) return ;
Pen pp= new Pen(Color.Red,1);
if (ft)
{
ft=false;
pp.DashPattern=dot1;

}
else
{
pp.DashPattern=dot2;
ft=true;

}
pp.DashStyle=DashStyle.Custom;
pictureBox1.Refresh();

gp.DrawRectangle(pp,startP.X,startP.Y,endP.X-startP.X ,endP.Y-startP.Y  );
} private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
if (down)
{
endP.X=e.X;
endP.Y=e.Y;
dispBJ=true;
}
} private void Form1_SizeChanged(object sender, System.EventArgs e)
{
gp.Dispose();
//gp=this.CreateGraphics();
gp=pictureBox1.CreateGraphics();
}
}
}

看看这些代码,是用GDI+画的
public class RubberBandForm : System.Windows.Forms.Form
{ private System.Drawing.Graphics drawingSurface;
private System.Drawing.Pen erasePen ;
private System.Drawing.Pen drawPen;
private System.Drawing.Point ptsStart = new Point();
private System.Drawing.Point ptsPrevious = new Point(); /// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null; public RubberBandForm()
{
//
// Required for Windows Form Designer support
//
InitializeComponent(); drawingSurface = this.CreateGraphics();
// Pen to erase a previous line
erasePen = new System.Drawing.Pen(this.BackColor);
// Pen to draw a new line
drawPen = new System.Drawing.Pen(Color.Blue); } /// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
} protected override void OnMouseDown(MouseEventArgs e) {
if(e.Button == MouseButtons.Left) {
// Store the starting point for your rubber-band line.
this.ptsStart = new Point(e.X, e.Y);
// Store the previous end point for your rubber-band line.
this.ptsPrevious = this.ptsStart;
}
base.OnMouseDown(e);
} protected override void OnMouseMove(MouseEventArgs e) {
// Check if the left mouse button is pressed.
if( e.Button == MouseButtons.Left) {
// Declare a local variable for the current end point of your rubber-band line.
System.Drawing.Point ptsCurrent = new Point();
// Store the current end point of your rubber-band line.
ptsCurrent.X = e.X;
ptsCurrent.Y = e.Y;
// Draw your actual rubber-band lines.
drawingSurface.DrawLine(erasePen, ptsStart.X, ptsStart.Y, ptsPrevious.X, ptsPrevious.Y);
drawingSurface.DrawLine(drawPen, ptsStart.X, ptsStart.Y, ptsCurrent.X, ptsCurrent.Y);
// Store the current end point for the next call to OnMouseMove.
ptsPrevious = ptsCurrent;
}
base.OnMouseMove(e);
}

调试易

价值100分的问题，再没人回答就赠送美女、小车、洋房@x@……

解决方案 »