C#中用“橡皮条”法绘图和重绘

窗体中仅包含一个pictrueBox1,先将代码付诸于下：
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Drawing2D;

namespace GDI_练习
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
public System.Windows.Forms.PictureBox pictureBox1;
private Point p1 = Point.Empty, p2 = Point.Empty;
private bool isMouseDown = false, isMouseUp = false;

ArrayList addArray = new ArrayList();
public struct SharpType
{
   public string type;
   public Point p1, p2;
   public Color foreColor, backColor;
   public Brush brush;
   public SharpType( string type, Point p1, Point p2, Color foreColor, Color backColor, Brush brush )
   {
    this.type = type;
    this.p1 = p1;
    this.p2 = p2;
    this.foreColor = foreColor;
    this.backColor = backColor;
    this.brush = brush;
   }

}

/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

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.pictureBox1 = new System.Windows.Forms.PictureBox();
   this.SuspendLayout();
   //
   // pictureBox1
   //
   this.pictureBox1.BackColor = System.Drawing.Color.White;
   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(432, 397);
   this.pictureBox1.TabIndex = 0;
   this.pictureBox1.TabStop = false;
   this.pictureBox1.Paint += new System.Windows.Forms.PaintEventHandler(this.pictureBox1_Paint);
   this.pictureBox1.MouseUp += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseUp);
   this.pictureBox1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseMove);
   this.pictureBox1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseDown);
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(432, 397);
   this.Controls.Add(this.pictureBox1);
   this.Name = "Form1";
   this.Text = "Form1";
   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 pictureBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
   if( ! isMouseUp )
   {
    this.isMouseDown = true;
    this.p1 = new Point( e.X, e.Y );
   }

}

private void pictureBox1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
   Graphics g = this.pictureBox1.CreateGraphics();
   if( isMouseDown && p2 != Point.Empty )
    g.DrawEllipse( Pens.White, p1.X, p1.Y, Math.Abs( p1.X - p2.X ), Math.Abs( p1.Y - p2.Y ) );

if( isMouseDown && ! isMouseUp )
   {
    p2 = new Point( e.X, e.Y );
    g.DrawEllipse( Pens.Black, p1.X, p1.Y, Math.Abs( p1.X - p2.X ), Math.Abs( p1.Y - p2.Y ) );

}
   foreach( SharpType type in addArray )
   {
    g.DrawEllipse( Pens.Black, type.p1.X, type.p1.Y, Math.Abs( type.p1.X - type.p2.X ), Math.Abs( type.p1.Y - type.p2.Y ) );

}
g.Dispose();
}

private void pictureBox1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
   this.isMouseDown = false;
   p2 = new Point( e.X, e.Y );
   Graphics g = this.pictureBox1.CreateGraphics();
   g.DrawEllipse( Pens.Black, p1.X, p1.Y, Math.Abs( p1.X - p2.X ), Math.Abs( p1.Y - p2.Y ) );
   addArray.Add( new SharpType( "a", p1, p2, Color.Black, Color.Empty, Brushes.Black ) );
   p1 = Point.Empty;
   p2 = Point.Empty;
   g.Dispose();

}

private void pictureBox1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
   foreach( SharpType type in addArray )
   {
    e.Graphics.DrawEllipse( Pens.Black, type.p1.X, type.p1.Y, Math.Abs( type.p1.X - type.p2.X ), Math.Abs( type.p1.Y - type.p2.Y ) );

}
}

完

C#中用“橡皮条”法绘图和重绘相关推荐

孙鑫-MFC笔记六--绘图，重绘
Windows颜色对话框功能的添加: MFC提供了CColorDialog类,方便创建颜色对话框. CColorDialog dlg: dlg.DoModal(); 默认为黑色.即首参为值为0. 保存 ...
Phone重绘机制drawRect 转
Phone重绘机制drawRect 如何使用iPhone进行绘图.重绘操作 iPhone的绘图操作是在UIView类的drawRect方法中完成的,所以如果我们要想在一个UIView中绘图,需要写一个 ...
c#中控件重绘（放大缩小移动隐藏恢复后不消失）实例
//很重要,一定要重写并在在OnPaint()中用传入的pevent.Graphics重绘,并且屏蔽掉父类的OnPaint方法,这样重绘后的图形不论控件怎么操作都不会消失了 using System; ...
iPhone重绘机制drawRect
iPhone重绘机制drawRect 如何使用iPhone进行绘图.重绘操作 iPhone的绘图操作是在UIView类的drawRect方法中完成的,所以如果我们要想在一个UIView中绘图,需要写一 ...
java使用重绘实现拖动_原生JS使用Canvas实现拖拽式绘图功能
一.实现的功能 1.基于oop思想构建,支持坐标点.线条(由坐标点组成,包含方向).多边形(由多个坐标点组成).圆形(包含圆心坐标点和半径)等实体 2.原生JavaScript实现,不依赖任何第三方j ...
双缓冲法解决重绘和闪屏问题
重绘导致原因:UpdateData.Invalidate.InvalidateRect和UpdateWindow函数. 1. UpdateData重绘控件函数 UpdateData(TRUE)--刷新 ...
ui九宫格切图_【九宫切图】什么是九宫绘图，九宫格绘法
九宫切图在控件美化的时候会经常的用到比如: 20140630220626_56850.png (3.13 KB, 下载次数: 42) [九宫切图]什么是九宫绘图,九宫格绘法 2014-7-21 11 ...
android view交替动画,Android View原理（View树遍历，View重绘，View动画）
一.屏幕绘图基础 Android中的GUI系统是客户端和服务端配合的窗口系统,即后台运行了一个绘制服务,每个应用程序都是该服务端的一个客户端,当客户端需要绘制时,首先请求服务端创建一个窗口,然后在窗口 ...
java画笔覆盖在界面_Java实现画图程序和重绘
上次聊了一下事件监听机制,今天就来聊一下怎么实现一个画图程序并且实现重绘. 一.实现画图程序 1.实现一个画图程序所需的API类? JFrame窗体容器组件类 JPanel 面板元素组件类 JButt ...

C#中用“橡皮条”法绘图和重绘

C#中用“橡皮条”法绘图和重绘相关推荐

最新文章

热门文章