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一款基于C#开发的电子签名程序,主要实现了签名的保存,适合初学者使用,可将完成的签名保存到指定位置,可修改对应的画笔颜色、宽度、透明度等
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace ElectronicSignature
{
public partial class Frm_Main : Form
{
//記錄直線或者曲線的物件
private System.Drawing.Drawing2D.GraphicsPath mousePath = new System.Drawing.Drawing2D.GraphicsPath();
//畫筆透明度
private int myAlpha = 100;
//畫筆顏色對象
private Color myUserColor = new Color();
//畫筆寬度
private int myPenWidth = 3;
//簽名的圖片物件
public Bitmap SavedBitmap;
public Frm_Main()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
try
{
mousePath.AddLine(e.X, e.Y, e.X, e.Y);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
pictureBox1.Invalidate();
}
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
mousePath.StartFigure();
}
}
#region 參數設置
public void set()
{
//畫筆寬度
myPenWidth = Convert.ToInt32(cbx_HBKD.Text.ToString());
switch (cbx_HBYS.Text)
{
case "藍色":
myUserColor = System.Drawing.Color.Blue;
break;
case "紅色":
myUserColor = System.Drawing.Color.Red;
break;
case "黃色":
myUserColor = System.Drawing.Color.Yellow;
break;
}
myAlpha = Convert.ToInt32(cbx_TMD.Text);
}
#endregion
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
try
{
set();//設置畫筆的顏色、寬度、透明度
Pen CurrentPen = new Pen(Color.FromArgb(myAlpha, myUserColor), myPenWidth);
e.Graphics.DrawPath(CurrentPen, mousePath);
}
catch { }
}
private void btn_Clear_Click(object sender, EventArgs e)
{
pictureBox1.CreateGraphics().Clear(Color.White);
mousePath.Reset();
}
private void btn_Save_Click(object sender, EventArgs e)
{
bool isSave = true;
SavedBitmap = new Bitmap(pictureBox1.Width, pictureBox1.Height);
pictureBox1.DrawToBitmap(SavedBitmap, new Rectangle(0, 0, pictureBox1.Width, pictureBox1.Height));
#region 儲存圖片
SaveFileDialog saveImageDialog = new SaveFileDialog();
saveImageDialog.Title = "圖片儲存";
saveImageDialog.Filter = @"jpeg|*.jpg|bmp|*.bmp|gif|*.gif";
if (saveImageDialog.ShowDialog() == DialogResult.OK)
{
string fileName = saveImageDialog.FileName.ToString();
if (fileName != "" && fileName != null)
{
string fileExtName = fileName.Substring(fileName.LastIndexOf(".") 1).ToString();
System.Drawing.Imaging.ImageFormat imgformat = null;
//預設儲存為JPG格式
if (imgformat == null)
{
imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;
}
if (isSave)
{
try
{
SavedBitmap.Save(fileName, System.Drawing.Imaging.ImageFormat.Bmp);
SavedBitmap.Dispose();
MessageBox.Show("圖片已經成功儲存!");
}
catch
{
MessageBox.Show("儲存失敗,你還沒有截取過圖片或已經清空圖片!");
}
}
}
}
#endregion
}
public Bitmap SaveImage(PictureBox pictureBox1)
{
Bitmap SavedBitmap = new Bitmap(pictureBox1.Width, pictureBox1.Height);
pictureBox1.DrawToBitmap(SavedBitmap, new Rectangle(0, 0, pictureBox1.Width, pictureBox1.Height));
return SavedBitmap;
}
}
}