实例介绍
【实例简介】
【实例截图】
【实例截图】
【核心代码】
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace Image
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
private System.Windows.Forms.OpenFileDialog openFileDialog1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.NumericUpDown numericUpDown1;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.NumericUpDown numericUpDown2;
private System.String StrFileName="";
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.button1 = new System.Windows.Forms.Button();
this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
this.button2 = new System.Windows.Forms.Button();
this.numericUpDown1 = new System.Windows.Forms.NumericUpDown();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.numericUpDown2 = new System.Windows.Forms.NumericUpDown();
((System.ComponentModel.ISupportInitialize)(this.numericUpDown1)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.numericUpDown2)).BeginInit();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(24, 208);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(80, 23);
this.button1.TabIndex = 0;
this.button1.Text = "浏览图像";
this.button1.Click = new System.EventHandler(this.button1_Click);
//
// openFileDialog1
//
this.openFileDialog1.Filter = "Image files (JPeg, Gif, Bmp, etc.)|*.jpg;*.jpeg;*.gif;*.bmp;*.tif; *.tiff; *.png|"
" JPeg files (*.jpg;*.jpeg)|*.jpg;*.jpeg |GIF files (*.gif)|*.gif |BMP files (*.b"
"mp)|*.bmp|Tiff files (*.tif;*.tiff)|*.tif;*.tiff|Png files (*.png)| *.png |All f"
"iles (*.*)|*.*";
//
// button2
//
this.button2.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
this.button2.Location = new System.Drawing.Point(8, 8);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(360, 192);
this.button2.TabIndex = 1;
this.button2.Paint = new System.Windows.Forms.PaintEventHandler(this.button2_Paint);
//
// numericUpDown1
//
this.numericUpDown1.Location = new System.Drawing.Point(184, 208);
this.numericUpDown1.Minimum = new System.Decimal(new int[] {
1,
0,
0,
0});
this.numericUpDown1.Name = "numericUpDown1";
this.numericUpDown1.Size = new System.Drawing.Size(40, 21);
this.numericUpDown1.TabIndex = 2;
this.numericUpDown1.Value = new System.Decimal(new int[] {
5,
0,
0,
0});
this.numericUpDown1.ValueChanged = new System.EventHandler(this.numericUpDown1_ValueChanged);
//
// label1
//
this.label1.Location = new System.Drawing.Point(112, 212);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(72, 16);
this.label1.TabIndex = 3;
this.label1.Text = "X方向缩放：";
//
// label2
//
this.label2.Location = new System.Drawing.Point(232, 212);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(72, 16);
this.label2.TabIndex = 5;
this.label2.Text = "Y方向缩放：";
//
// numericUpDown2
//
this.numericUpDown2.Location = new System.Drawing.Point(304, 208);
this.numericUpDown2.Minimum = new System.Decimal(new int[] {
1,
0,
0,
0});
this.numericUpDown2.Name = "numericUpDown2";
this.numericUpDown2.Size = new System.Drawing.Size(48, 21);
this.numericUpDown2.TabIndex = 4;
this.numericUpDown2.Value = new System.Decimal(new int[] {
5,
0,
0,
0});
this.numericUpDown2.ValueChanged = new System.EventHandler(this.numericUpDown2_ValueChanged);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(376, 238);
this.Controls.Add(this.label2);
this.Controls.Add(this.numericUpDown2);
this.Controls.Add(this.label1);
this.Controls.Add(this.numericUpDown1);
this.Controls.Add(this.button2);
this.Controls.Add(this.button1);
this.MaximizeBox = false;
this.Name = "Form1";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "演示以任意比例缩放显示图像";
((System.ComponentModel.ISupportInitialize)(this.numericUpDown1)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.numericUpDown2)).EndInit();
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 button1_Click(object sender, System.EventArgs e)
{//浏览图像
this.openFileDialog1.ShowDialog();
this.StrFileName=this.openFileDialog1.FileName;
this.button2.Refresh();
}
private void button2_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{//以任意比例缩放显示图像
if(this.StrFileName.Trim()=="")
return;
System.Drawing.Bitmap MyBitmap=new Bitmap(this.StrFileName);
Graphics g = e.Graphics;
TextureBrush MyBrush = new TextureBrush(MyBitmap);
float fx=(float)(this.numericUpDown1.Value/10);
float fy=(float)(this.numericUpDown2.Value/10);
g.ScaleTransform(fx,fy);
//MyBrush.ScaleTransform(fx,fy);
g.FillRectangle(MyBrush,0,0,this.ClientRectangle.Width,this.ClientRectangle.Height);
}
private void numericUpDown1_ValueChanged(object sender, System.EventArgs e)
{//更新图像显示
this.button2.Refresh();
}
private void numericUpDown2_ValueChanged(object sender, System.EventArgs e)
{//更新图像显示
this.button2.Refresh();
}
}
}
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