急！关于在指定控件中画随鼠标移动的十字线问题

Question

我找到的一个解决方法只能基于整个form，不能针对指定的控件（如一个画图区域），那位高手能解决一下？
下面是我找到的在整个form上画十字线的代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private Point currentPoint = new Point(0, 0);
        private Pen pen = new Pen(Color.Black);        private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (e.X != currentPoint.X || e.Y != currentPoint.Y)
            {
                currentPoint = new Point(e.X, e.Y);
                this.Invalidate(true);    
            }
        }        
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e); 
            e.Graphics.DrawLine(pen, 0, currentPoint.Y, this.Width, currentPoint.Y);    //绘制横线
            e.Graphics.DrawLine(pen, currentPoint.X, 0, currentPoint.X, this.Height);  //会制纵线
        }        private void Form1_Closed(object sender, System.EventArgs e)
        {
            pen.Dispose();
        }
|

Answer 1

protected override void OnPaint(PaintEventArgs e) 
        { 
            base.OnPaint(e);  
            e.Graphics.DrawLine(pen, 0, currentPoint.Y, this.Width, currentPoint.Y);    //绘制横线 
            e.Graphics.DrawLine(pen, currentPoint.X, 0, currentPoint.X, this.Height);  //会制纵线 
        } 
这个窗体重绘，当然只针对form，在this.clientRectange内有效,不针对某控件你可以写成单独事件public void MouseEnvents(MouseEventArgs e)
{
  if (e.X != currentPoint.X  ¦ ¦ e.Y != currentPoint.Y) 
     { 
        currentPoint = new Point(e.X, e.Y); 
        //this.Invalidate(true); ?????
     }
}
public void Piants(Pen pen1,Pen pen2,PaintEventArgs e)
{
   e.Graphics.DrawLine(pen1, 0, currentPoint.Y, this.Width, currentPoint.Y);    //绘制横线 
   e.Graphics.DrawLine(pen2, currentPoint.X, 0, currentPoint.X, this.Height);  //会制纵线 
}////调用
private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e) 
{
    MouseEnvents(e);
    this.Invalidate(true);
}
protected override void OnPaint(PaintEventArgs e) 
{
    Piants(pen,pen,e);
}你只要在其他控件调用这两个自己写的事件就可以了！

Answer 2

我照着做了，可是十字线只在form上显示，控件内还是空白？
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private Point currentPoint = new Point(0, 0);
        private Pen pen = new Pen(Color.Black);        private void Form1_Closed(object sender, System.EventArgs e)
        {
            pen.Dispose();
        }
        public void MouseEnvents(MouseEventArgs e)
        {
            if (e.X != currentPoint.X  || e.Y != currentPoint.Y) 
            { 
                currentPoint = new Point(e.X, e.Y); 
                //this.Invalidate(true); ?????
            }
        }
        public void Piants(Pen pen1,Pen pen2,PaintEventArgs e)
        {
            e.Graphics.DrawLine(pen1, 0, currentPoint.Y, this.Width, currentPoint.Y);    //绘制横线 
            e.Graphics.DrawLine(pen2, currentPoint.X, 0, currentPoint.X, this.Height);  //会制纵线 
        }
        protected override void OnPaint(PaintEventArgs e) 
        {
            Piants(pen,pen,e);
        }        private void panel1_MouseMove(object sender, MouseEventArgs e)
        {
            MouseEnvents(e);
            this.Invalidate(true);
        }
   }
}

Answer 3

晕倒了 private void panel1_Paint(PaintEventArgs e)//在你要出现画线的控件的paint事件都调用！
  { 
    MouseEnvents(e); 
    this.Invalidate(true); 
  } 

Answer 4

this.Invalidate(true); 
这个不要(让子控件无效)

Answer 5

给你调试了下        private void button1_MouseMove(object sender, MouseEventArgs e)
        {
            MouseEnvents(e); 
        }        private void button1_Paint(object sender, PaintEventArgs e)
        {
            Piants(Pens.Red, Pens.Orange, e);
            button1.Invalidate(true);//这个还是要，不然线不会动！
        }

Answer 6

这样做，发现CPU占用率及高，而原先的却没有？有什么好方法吗