利用双缓冲 提高GDI+绘图的性能

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Drawing.Drawing2D;using System.Text;using System.Windows.Forms;using System.Drawing.Imaging;using System.Runtime.InteropServices;using System.Windows.Media.Imaging;namespace simplebitmap{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } //画图操作 public void DrawLines(Graphics g) { float width = ClientRectangle.Width; float height = ClientRectangle.Height; float partX = width / 1000; float partY = height / 1000; for (int i = 0; i < 1000; i++) { g.DrawLine(Pens.Red, 0, height - (partY * i), partX * i, 0); g.DrawLine(Pens.Yellow, 0, height - (partY * i), (width) - partX * i, 0); g.DrawLine(Pens.Blue, 0, partY * i, (width) - partX * i, 0); } } //普通的绘制 private void Simple_Click(object sender, EventArgs e) { // 通过‘this’创建Graphics对象 Graphics g = this.CreateGraphics(); g.Clear(this.BackColor); // 画线 DrawLines(g); // 释放创建的对象 g.Dispose(); } //利用双缓冲 private void Bitmap_Click(object sender, EventArgs e) { Graphics g = this.CreateGraphics(); g.Clear(this.BackColor); // 创建一个 Bitmap 对象 ，大小为窗体大小 Bitmap curBitmap = new Bitmap(ClientRectangle.Width, ClientRectangle.Height); // 创建一个临时 Graphics 对象 Graphics g1 = Graphics.FromImage(curBitmap); // 通过临时Graphics 对象绘制线条 DrawLines(g1); // 调用Graphics 对象的DrawImage方法，并画位图 g.DrawImage(curBitmap, 0, 0); // 释放创建的对象 g1.Dispose(); curBitmap.Dispose(); g.Dispose(); } }}