Windows Mobile 5 编程体验4-阿里云开发者社区

Windows Mobile 5 编程体验4

2017-11-14 855

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简介：

今天做一个在windows mobile中画图，并保存到模拟器文件夹下的例子。ok新建一个项目，添加一个窗体。界面设计如下，在屏幕的中间我放了一个图片框。

要画图，肯定要用到鼠标事件，具体用到哪些呢，应该是Mouse_Down，Mouse_Move，Mouse_Up。首先当鼠标按下时，我们创建一个点的list数组。当鼠标移动的时候我们就往这个list数组里面添加点。在高中我们就学过点成线，线成面。废话不多说，看看程序。

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;
namespace SmartDeviceProject1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
List<Point> listPoint = null;
List<List<Point>> lineList = new List<List<Point>>();
/// <summary>
/// 画笔按下
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
listPoint = new List<Point>(); //创建点的集合
}
/// <summary>
/// 画笔移动
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
this.AddPoint(e.X, e.Y);
}
/// <summary>
/// 添加点
/// </summary>
/// <param name="pointX"></param>
/// <param name="pointY"></param>
private void AddPoint(int pointX,int pointY)
{
listPoint.Add(new Point(pointX, pointY));
int pointCount = listPoint.Count;
if (pointCount > 1)
{
Graphics gp = pictureBox1.CreateGraphics();
Pen pen = new Pen(Color.Red);
gp.DrawLine(pen, listPoint[pointCount - 2].X, listPoint[pointCount - 2].Y,listPoint[pointCount-1].X,listPoint[pointCount-1].Y);
gp.Dispose();
pen.Dispose();
}
}
/// <summary>
/// 画笔抬起
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
this.AddPoint(e.X,e.Y);
lineList.Add(listPoint);//将所有的线条添加进来
}
/// <summary>
/// 绘制线条
/// </summary>
private void DrawLines(Graphics gp)
{
Pen pen = new Pen(Color.Red);
int lineCount = lineList.Count;
foreach (List<Point> point in lineList)
{
gp.DrawLine(pen,point[0].X,point[0].Y,point[1].X,point[1].Y);
}
pen.Dispose();
}
//保存图片
private void button1_Click(object sender, EventArgs e)
{
try
{
saveFileDialog1.Filter = "Jpg图片|*.jpg|Gif图片|*.gif|BMP图片|*.bmp|PNG图片|*.png|图片|*.jpg;*.gif;*.bmp;*.png";
saveFileDialog1.FilterIndex =1;
if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
if (lineList.Count > 0)
{
Bitmap bmp = new Bitmap(pictureBox1.ClientSize.Width, pictureBox1.ClientSize.Height);
Graphics gp = Graphics.FromImage(bmp);
Brush brush = new SolidBrush(Color.White);
gp.FillRectangle(brush, pictureBox1.ClientRectangle);
this.DrawLines(gp);
bmp.Save(saveFileDialog1.FileName, System.Drawing.Imaging.ImageFormat.Bmp);
bmp.Dispose();
gp.Dispose();
brush.Dispose();
}
else
{
MessageBox.Show("你还没有绘图，请绘图", "提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation,MessageBoxDefaultButton.Button1);
}
}
}
catch(Exception m)
{
MessageBox.Show("保存图片失败,原因:"+m.Message);
}
finally
{
lineList.Clear(); //保存完毕，清除所有线条
}
}
/// <summary>
/// 清除绘制的图形
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button2_Click(object sender, EventArgs e)
{
lineList.Clear();
pictureBox1.Invalidate();
}
}
}