GDI+画图 并在Form窗口拖动的问题
刚学GDI+写了一段程序,在form窗口画个矩形,然后可以拖动.现在拖动是没有问题的.就是拖动的时候不能太快.一旦快了,鼠标就划出矩形区域了.着个问题要怎么解决啊.以下是拖动代码.
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
//是否选中空间
if (this.isSelect == true)
{
if (e.Button == MouseButtons.Left)
{
if (this.Rect.Contains(e.Location))
{
Point point = e.Location;
_mouseEnd = point;
int vix = _mouseEnd.X - _mouseStart.X;
int viy = _mouseEnd.Y - _mouseStart.Y;
int positionX = this.Location1.X + vix;
int positionY = this.Location1.Y + viy;
Point location = new Point(positionX, positionY);
this.Location1 = location;
this.Invalidate(this.Rect);
this.Refresh();
_mouseStart = _mouseEnd;
Pain(this.Graphics);
}
}
}
}
[解决办法]
设个bool 值 判断是拖动 还是划出矩形区域
[解决办法]
MouseMove也是每隔一段時間執行一次的，所以太快的話，MouseMove是反應不過來的。
[解决办法]
我有一个代码，楼主试试（VS2005的环境）：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace TestApp
{
public partial class Form3 : Form
{
public Form3()
{
InitializeComponent();
}
private Rectangle m_Rect = Rectangle.Empty;
private Point m_StartPoint = Point.Empty;
private bool m_canMove;
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
this.m_Rect = new Rectangle(10, 10, 100, 80);
this.m_StartPoint = m_Rect.Location;
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
this.drawRect(e.Graphics);
}
private void drawRect(Graphics graphics)
{
BufferedGraphicsContext context = BufferedGraphicsManager.Current;
BufferedGraphics bg = context.Allocate(graphics, this.ClientRectangle);
bg.Graphics.Clear(this.BackColor);
bg.Graphics.FillRectangle(SystemBrushes.ControlText, m_Rect);
bg.Render();
bg.Dispose();
bg = null;
}
protected override void OnMouseDown(MouseEventArgs e)
{
if (this.m_Rect.Contains(e.Location))
{
m_canMove = true;
this.m_StartPoint = e.Location;
}
base.OnMouseDown(e);
}
protected override void OnMouseUp(MouseEventArgs e)
{
m_canMove = false;
base.OnMouseUp(e);
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (e.Button == MouseButtons.Left && m_canMove)
{
this.m_Rect.Offset(e.X - this.m_StartPoint.X, e.Y - this.m_StartPoint.Y);
this.m_StartPoint = e.Location;
this.drawRect(this.CreateGraphics());
}
}
}
}
[解决办法]
应该在MouseDown里判断是否在矩形内，记录个变量，不要在MouseMove里判断鼠标的位置
