form1.cs

C#150例

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Drawing2D; 

namespace Example028_缩放时使用插值模式控制图像质量
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		/// <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 Form Designer generated code
		/// <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()
		{
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(292, 273);
			this.Name = "Form1";
			this.Text = "Form1";
			this.Load += new System.EventHandler(this.Form1_Load);
			this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void Form1_Load(object sender, System.EventArgs e)
		{
		}

		private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
		{
			Image image = new Bitmap("..\\..\\test.bmp");
			int width = image.Width;
			int height = image.Height;

			// Draw the image with no shrinking or stretching.
			e.Graphics.DrawImage(
				image,
				new Rectangle(10, 10, width, height),  // destination rectangle  
				0,
				0,           // upper-left corner of source rectangle
				width,       // width of source rectangle
				height,      // height of source rectangle
				GraphicsUnit.Pixel,
				null);

			// Shrink the image using low-quality interpolation. 
			e.Graphics.InterpolationMode = InterpolationMode.NearestNeighbor;
			e.Graphics.DrawImage(
				image,
				new Rectangle(10, 250, (int)(0.6 * width), (int)(0.6*height)), 
				// destination rectangle 
				0,
				0,           // upper-left corner of source rectangle
				width,       // width of source rectangle
				height,      // height of source rectangle
				GraphicsUnit.Pixel);

			// Shrink the image using medium-quality interpolation.
			e.Graphics.InterpolationMode = InterpolationMode.HighQualityBilinear;
			e.Graphics.DrawImage(
				image,
				new Rectangle(150, 250, (int)(0.6 * width), (int)(0.6 * height)),
				// destination rectangle 
				0,
				0,           // upper-left corner of source rectangle
				width,       // width of source rectangle
				height,      // height of source rectangle
				GraphicsUnit.Pixel);

			// Shrink the image using high-quality interpolation.
			e.Graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
			e.Graphics.DrawImage(
				image,
				new Rectangle(290, 250, (int)(0.6 * width), (int)(0.6 * height)),
				// destination rectangle 
				0,
				0,           // upper-left corner of source rectangle
				width,       // width of source rectangle
				height,      // height of source rectangle
				GraphicsUnit.Pixel);
		}
	}
}