using?System;
using?System.Collections.Generic;
using?System.ComponentModel;
using?System.Data;
using?System.Drawing;
using?System.Linq;
using?System.Text;
using?System.Windows.Forms;

using?System.Drawing.Drawing2D;
using?System.Drawing.Text;

namespace?GDI
{
????public?partial?class?Form1?:?Form
????{
????????public?Form1（）
????????{
????????????InitializeComponent（）;
????????}
????????
????????//（1）從窗口的指定句柄創建新的?Graphics對象。
????????//?public?static?Graphics?FromHwnd（IntPtr?hwnd）??
????????//（2）?從指定的?Image?創建新的?Graphics?對象。
????????//?public?static?Graphics?FromImage（Image?image）??
????????//（3）?從設備上下文的指定句柄創建新的?Graphics?對象。
????????//?public?static?Graphics?FromHdc（IntPtr?hdc）??
????????//?public?static?Graphics?FromHdc（IntPtr?hdcIntPtr?hdevice）??
????????//?（4）?為控件創建?Graphics?對象。
????????//?public?Graphics?CreateGraphics（）??
????????private?void?button1_Click（object?sender?EventArgs?e）
????????{
????????????//從窗體的句柄創建?Graphics?對象
????????????Graphics?g?=?Graphics.FromHwnd（this.Handle）;
????????????g.Clear（Color.Black）;

????????????//創建用于繪制圖像使用的畫筆
????????????Pen?myPen?=?new?Pen（Color.Red）;

????????????//畫矩形
????????????g.DrawRectangle（myPen?20?20?200?100）;

????????????//畫直線
????????????g.DrawLine（myPen?20?250?200?250）;
????????????//畫橢圓
????????????g.DrawEllipse（myPen?new?Rectangle（250?20?150?100））;

????????????myPen.Dispose（）;
????????????g.Dispose（）;

????????}

????????private?void?Form1_Load（object?sender?EventArgs?e）
????????{

????????}


????????private?void?button2_Click（object?sender?EventArgs?e）
????????{
????????????//創建Graphics對象
????????????Graphics?g?=?this.CreateGraphics（）;
????????????g.Clear（Color.White）;
????????????//創建畫筆，第一個參數為顏色，第二個參數為畫筆寬度，可選參數，默認為一
????????????Pen?p?=?new?Pen（Color.Black?2）;
????????????//繪制矩形
????????????g.DrawRectangle（p?50?50?200?100）;
????????????//重新設置畫筆顏色
????????????p.Color?=?Color.Green;
????????????//重新設置畫筆寬度
????????????p.Width?=?10;
????????????//繪制橢圓
????????????g.DrawEllipse（p?50?200?200?100）;
????????????//釋放對象
????????????p.Dispose（）;
????????????g.Dispose（）;
????????}

????????private?void?button3_Click（object?sender?EventArgs?e）
????????{
????????????Graphics?g?=?this.CreateGraphics（）;
????????????g.Clear（Color.White）;
????????????//默認為實線
????????????Pen?p?=?new?Pen（Color.Red?3）;

????????????g.DrawRectangle（p?50?50?200?100）;

????????????//設置畫筆線形
????????????p.Dashstyle?=?Dashstyle.DashDotDot;
????????????g.DrawRectangle（p?50?200?200?100）;

????????????//使用自定義線形
????????????float[]?dashArray?=?{?
????????????????????????????????5.0f//線長5像素
????????????????????????????????2.0f//間斷2像素
????????????????????????????????15.0f//線長15像素
????????????????????????????????8.0f//間斷4像素
????????????????????????????????};
????????????p.DashPattern?=?dashArray;
????????????p.Color?=?Color.Black;
????????????g.DrawLine（p?280?100?500?100）;

????????????//釋放資源
??