WINCE上的手写签名,同样可应用于WINFORM.
主要应用的知识为,在鼠标点击,移动时,获取当前的点,在每一笔都为一个集合,一个集合中包含了这一笔中所有的点.通过调用DrawLines方法来画线.
代码很简单,如下所示
using
System;
using
System.Linq;
using
System.Collections.Generic;
using
System.ComponentModel;
using
System.Data;
using
System.Drawing;
using
System.Text;
using
System.Windows.Forms;
using
System.Net;
using
System.Net.Sockets;
namespace
SmartDeviceProject1
{
public
partial
class
MobileTest : Form
{
List
<
Points
>
handTrack
=
new
List
<
Points
>
();
public
Graphics pb_Graphics;
Bitmap pb_BMP
=
new
Bitmap(
240
,
268
);//签名时图片的大小
int
index
=
0
;
//
第几笔
bool
isDrawing
=
false
;//用于在move时,只有在Down的时候才画.
public
MobileTest()
{
InitializeComponent();
}
private
void
Form1_Paint(
object
sender, PaintEventArgs e)
{
try
{
pb_Graphics
=
Graphics.FromImage((System.Drawing.Image)pb_BMP);//获取图片的Graphics
pb_Graphics.Clear(
this
.BackColor);
foreach
(Points item
in
handTrack)
{
if
(item.PT.Count
>
1
)
pb_Graphics.DrawLines(
new
Pen(Color.Black), item.PT.ToArray());
}
e.Graphics.DrawImage(pb_BMP,
0
,
0
);//其实是在当前控件上写了一个图片
pb_Graphics.Dispose();
}
catch
(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private
void
Form1_MouseDown(
object
sender, MouseEventArgs e)
{
isDrawing
=
true
;
handTrack.Add(
new
Points());
handTrack[index].PT.Add(
new
Point(e.X, e.Y));
this
.Refresh();
}
private
void
Form1_MouseMove(
object
sender, MouseEventArgs e)
{
if
(isDrawing
==
true
)
{
handTrack[index].PT.Add(
new
Point(e.X, e.Y));
this
.Refresh();
}
}
private
void
Form1_MouseUp(
object
sender, MouseEventArgs e)
{
index
++
;
isDrawing
=
false
;
}
//一个菜单按钮,用于清空当前的签名.
private
void
menuItem1_Click(
object
sender, EventArgs e)
{
this
.handTrack.Clear();
index
=
0
;
this
.Refresh();
}
}
class
Points
{
public
List
<
Point
>
PT
=
new
List
<
Point
>
();
}
}
在Paint的时候,用了当item.PT.count>1的时候才画,这是因为,这个方法只有在集合点数大于1的时候才正确,否则会出现参数错误的报错信息.
当然也可以在0<count<=1的时候,调用DrawLine来单独画点.
代码在CINCE 5.0 ,WINDOWS XP上测试通过.
使用VS2008,SDK为3.5