winform 图片放大缩小

最新推荐文章于 2025-03-13 11:27:57 发布

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最新推荐文章于 2025-03-13 11:27:57 发布

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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.Threading;
using System.IO;
using System.Xml.Serialization;
using DevComponents.DotNetBar;
using System.Drawing.Printing;
namespace ThreadingTest
{
public partial class PicView : Office2007Form
{
private Point pt;
private const double step = 0.1;
public PicView()
{
InitializeComponent(); pictureBox2.MouseWheel += new MouseEventHandler(pictureBox2_MouseWheel);
pbMain.Image = Image.FromFile(@"D:\界面布局.bmp");
oldwith = pbMain.Width = pbMain.Image.Width;
oldHeith = pbMain.Height = pbMain.Image.Height;
oldPoint = pbMain.Location = new Point((panelContainer.Width - pbMain.Width) / 2, (panelContainer.Height - pbMain.Height) / 2);
}
/// <summary>
/// 这个是封装dll的方法，直接改为类库，就可以调用了
/// </summary>
public void SetPath(string path, string name)
{ pictureBox2.MouseWheel += new MouseEventHandler(pictureBox2_MouseWheel);
this.Name = name;
if (!File.Exists(path))
{
return;
}
FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
Image image = Image.FromStream(fs);
fs.Close();
fs.Dispose();
pbMain.Image = image;
oldwith = pbMain.Width = pbMain.Image.Width;
oldHeith = pbMain.Height = pbMain.Image.Height;
oldPoint = pbMain.Location = new Point((panelContainer.Width - pbMain.Width) / 2, (panelContainer.Height - pbMain.Height) / 2);
}
#region Event
/// <summary>
/// 放大
/// </summary>
private void btnEnlarge_Click(object sender, EventArgs e)
{
try
{
pbMain.Width = pbMain.Width + int.Parse(Math.Ceiling(pbMain.Width * step).ToString());
pbMain.Height = pbMain.Height + int.Parse(Math.Ceiling(pbMain.Height * step).ToString());
pbMain.Location = new Point((panelContainer.Width - pbMain.Width) / 2, (panelContainer.Height - pbMain.Height) / 2);
}
catch { }
}
/// <summary>
/// 缩小
/// </summary>
private void btnReduce_Click(object sender, EventArgs e)
{
pbMain.Width = pbMain.Width - int.Parse(Math.Ceiling(pbMain.Width * step).ToString());
pbMain.Height = pbMain.Height - int.Parse(Math.Ceiling(pbMain.Height * step).ToString());
pbMain.Location = new Point((panelContainer.Width - pbMain.Width) / 2, (panelContainer.Height - pbMain.Height) / 2);
}
private void pbMain_MouseDown(object sender, MouseEventArgs e)
{
pt = Cursor.Position;
pbMain.Cursor = Cursors.SizeAll;
}
private void pbMain_MouseUp(object sender, MouseEventArgs e)
{
pbMain.Cursor = Cursors.Default;
}
private void pbMain_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
int px = Cursor.Position.X - pt.X;
int py = Cursor.Position.Y - pt.Y;
pbMain.Location = new Point(pbMain.Location.X + px, pbMain.Location.Y + py);
pt = Cursor.Position;
}
}
/// <summary>
/// 打印预览图片效果
/// </summary>
Image image = null;
private void btnPrint_Click(object sender, EventArgs e)
{
image = new Bitmap(this.panelContainer.Bounds.Width, this.panelContainer.Bounds.Height);
Graphics gps = Graphics.FromImage(image);
gps.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
gps.CopyFromScreen(this.panelContainer.PointToScreen(new Point(0, 0)).X, this.panelContainer.PointToScreen(new Point(0, 0)).Y, 0, 0, new Size(this.panelContainer.Bounds.Width, this.panelContainer.Bounds.Height));
ppd.Document = pdMain;
System.Drawing.Printing.PageSettings df = new System.Drawing.Printing.PageSettings();
df.PaperSize = new PaperSize("new size", image.Width, image.Height);
pdMain.DefaultPageSettings = df;
ppd.PrintPreviewControl.Zoom = 0.5;
ppd.ShowDialog();
}
/// <summary>
/// 导出
/// </summary>
private void btnExport_Click(object sender, EventArgs e)
{
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.Filter = "jpeg|*.jpg|bitmap|*.bmp|gif|*.gif|tiff|*.tif";
saveFileDialog.FilterIndex = 1;
saveFileDialog.RestoreDirectory = true;
if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
pbMain.Image.Save(saveFileDialog.FileName, System.Drawing.Imaging.ImageFormat.Tiff);
}
}
/// <summary>
/// 打印
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void pdMain_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
e.Graphics.DrawImage(image, new PointF(0,0));
}
#endregion
private int oldwith = 0;
private int oldHeith = 0;
private Point oldPoint = new Point();
/// <summary>
/// 复位
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button1_Click(object sender, EventArgs e)
{
pbMain.Width = oldwith;
pbMain.Height = oldHeith;
pbMain.Location = oldPoint;
}
//鼠标滑轮放大缩小
private void pictureBox2_MouseWheel(object sender, MouseEventArgs e)
{
if (e.Delta > 0)
{
if (pictureBox2.Width < 12000 && pictureBox2.Height < 7000)
{
pictureBox2.Width = pictureBox2.Width + int.Parse(Math.Ceiling(pictureBox2.Width * step).ToString());
pictureBox2.Height = pictureBox2.Height + int.Parse(Math.Ceiling(pictureBox2.Height * step).ToString());
pictureBox2.Location = new Point((panelEx2.Width - pictureBox2.Width) / 2, (panelEx2.Height - pictureBox2.Height) / 2);
}
}
else
{
if (pictureBox2.Width > 70 && pictureBox2.Height > 40)
{
pictureBox2.Width = pictureBox2.Width - int.Parse(Math.Ceiling(pictureBox2.Width * step).ToString());
pictureBox2.Height = pictureBox2.Height - int.Parse(Math.Ceiling(pictureBox2.Height * step).ToString());
pictureBox2.Location = new Point((panelEx2.Width - pictureBox2.Width) / 2, (panelEx2.Height - pictureBox2.Height) / 2);
}
}
}
}
}