private void button2_Click(object sender, EventArgs e)
{
Bitmap image = new Bitmap(200, 200);
Graphics g = Graphics.FromImage(image);
//使绘图质量最高，即消除锯齿
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.CompositingQuality = CompositingQuality.HighQuality;
Pen p = new Pen(Color.Blue, 2);//定义了一个蓝色,宽度为的画笔
g.DrawString("字符串", new Font("宋体", 10), new SolidBrush(Color.Blue), new PointF(10, 10));
g.DrawLine(p, 0, 0, 200, 200);//在画板上画直线
g.DrawRectangle(p, 0, 0, 200, 200);//在画板上画矩形
g.DrawEllipse(p, 0, 0, 200, 200);//在画板上画椭圆
//保存图片
image.Save(@"c:\1.jpg");
#region 显示
//pictureBox1.Image = (Image)image;
//pictureBox1.Image.Save(@"c:\1.jpg");
#endregion
}
private void button2_Click(object sender, EventArgs e)
{
Bitmap image = new Bitmap(400, 800);
Graphics g = Graphics.FromImage(image);
//使绘图质量最高，即消除锯齿
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.CompositingQuality = CompositingQuality.HighQuality;
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
Pen p = new Pen(Color.Black, 5);//定义了黑色,宽度为5的画笔
Pen p1 = new Pen(Color.Black, 2);//定义了黑色,宽度为2的画笔
SolidBrush sb = new SolidBrush(Color.Black); //定义笔刷
g.DrawString("测试", new Font("宋体", 18, FontStyle.Bold), sb, new PointF(20, 20));
g.DrawString("GSM 数字移动电话机", new Font("宋体", 10), sb, new PointF(120, 30));
g.DrawString("黑色 台", new Font("宋体", 12, FontStyle.Bold), sb, new PointF(300, 25));
g.DrawRectangle(p, 0, 0, 400, 800);//在画板上画外框矩形
g.DrawLine(p1, 20, 50, 380, 50);//在画板上画直线
g.DrawRectangle(p1, 20, 120, 360, 650);//在画板上画内框矩形
//粘贴本地条码图片到画板
Image image1 = Image.FromFile(@"c:\barcode.gif");
g.DrawImage(image1, 20, 60, image1.Width / 2, image1.Height / 2);
int heightC = 90; //起始Y坐标
int heightH = 60; //IMEI行间距
int imeiCount = 20; //循环IMEI数
int rows = imeiCount / 2; //行数
for (int i = 1; i <= rows; i++)
{
g.DrawImage(image1, 40, heightC + (heightH * i), image1.Width / 2, image1.Height / 2);
g.DrawImage(image1, 220, heightC + (heightH * i), image1.Width / 2, image1.Height / 2);
}
image1.Dispose();
g.Dispose();
//保存图片
image.Save(@"c:\1.jpg");
#region 显示
//pictureBox1.Image = (Image)image;
//pictureBox1.Image.Save(@"c:\1.jpg");
#endregion
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics; //创建画板,这里的画板是由Form提供的.
Pen p = new Pen(Color.Blue, 2);//定义了一个蓝色,宽度为的画笔
g.DrawLine(p, 10, 10, 100, 100);//在画板上画直线,起始坐标为(10,10),终点坐标为(100,100)
g.DrawRectangle(p, 10, 10, 100, 100);//在画板上画矩形,起始坐标为(10,10),宽为,高为
g.DrawEllipse(p, 10, 10, 100, 100);//在画板上画椭圆,起始坐标为(10,10),外接矩形的宽为,高为
/*
Pen p = new Pen(Color.Blue, 5);//设置笔的粗细为,颜色为蓝色
Graphics g = this.CreateGraphics();
//画虚线
p.DashStyle = DashStyle.Dot;//定义虚线的样式为点
g.DrawLine(p, 10, 10, 200, 10);
//自定义虚线
p.DashPattern = new float[] { 2, 1 };//设置短划线和空白部分的数组
g.DrawLine(p, 10, 20, 200, 20);
//画箭头,只对不封闭曲线有用
p.DashStyle = DashStyle.Solid;//恢复实线
p.EndCap = LineCap.ArrowAnchor;//定义线尾的样式为箭头
g.DrawLine(p, 10, 30, 200, 30);
g.Dispose();
p.Dispose();
*/
/*
Graphics g = this.CreateGraphics();
Rectangle rect = new Rectangle(10, 10, 50, 50);//定义矩形,参数为起点横纵坐标以及其长和宽
//单色填充
SolidBrush b1 = new SolidBrush(Color.Blue);//定义单色画刷
g.FillRectangle(b1, rect);//填充这个矩形
//字符串
g.DrawString("字符串", new Font("宋体", 10), b1, new PointF(90, 10));
//用图片填充
TextureBrush b2 = new TextureBrush(Image.FromFile(@"e:\picture\1.jpg"));
rect.Location = new Point(10, 70);//更改这个矩形的起点坐标
rect.Width = 200;//更改这个矩形的宽来
rect.Height = 200;//更改这个矩形的高
g.FillRectangle(b2, rect);
//用渐变色填充
rect.Location = new Point(10, 290);
LinearGradientBrush b3 = new LinearGradientBrush(rect, Color.Yellow , Color.Black , LinearGradientMode.Horizontal);
g.FillRectangle(b3, rect);
*/
}
/*
C#仿QQ截图
接下来看看这是如何做到的.
思路:聊天窗体上有一个截图按钮,点击按钮后,程序将整个屏幕画在一个新的全屏窗体上,
然后显示这个窗体.因为是全屏的窗体,并且隐藏了菜单栏、工具栏等,
所以在我们看来就好像是一个桌面的截图,然后在这个新窗体上画矩形,
最后保存矩形中的内容并显示在原来的聊天窗体中.
步骤:
A.新建一个窗体．命名为Catch.然后设置这个窗体的FormBorderStyle为None,WindowState为Maximized．
B.我们对代码进行编辑：
*/
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace Client
{
public partial class Catch : Form
{
public Catch()
{
InitializeComponent();
}
#region 用户变量
private Point DownPoint = Point.Empty;//记录鼠标按下坐标，用来确定绘图起点
private bool CatchFinished = false;//用来表示是否截图完成
private bool CatchStart = false;//表示截图开始
private Bitmap originBmp;//用来保存原始图像
private Rectangle CatchRect;//用来保存截图的矩形
#endregion
//窗体初始化操作
private void Catch_Load(object sender, EventArgs e)
{
this.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);
this.UpdateStyles();
//以上两句是为了设置控件样式为双缓冲，这可以有效减少图片闪烁的问题，关于这个大家可以自己去搜索下
originBmp = new Bitmap(this.BackgroundImage);//BackgroundImage为全屏图片，我们另用变量来保存全屏图片
}
//鼠标右键点击结束截图
private void Catch_MouseClick(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Right)
{
this.DialogResult = DialogResult.OK;
this.Close();
}
}
//鼠标左键按下时动作
private void Catch_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
if (!CatchStart)
{//如果捕捉没有开始
CatchStart = true;
DownPoint = new Point(e.X, e.Y);//保存鼠标按下坐标
}
}
}
private void Catch_MouseMove(object sender, MouseEventArgs e)
{
if (CatchStart)
{//如果捕捉开始
Bitmap destBmp = (Bitmap)originBmp.Clone();//新建一个图片对象，并让它与原始图片相同
Point newPoint = new Point(DownPoint.X, DownPoint.Y);//获取鼠标的坐标
Graphics g = Graphics.FromImage(destBmp);//在刚才新建的图片上新建一个画板
Pen p = new Pen(Color.Blue,1);
int width = Math.Abs(e.X - DownPoint.X), height = Math.Abs(e.Y - DownPoint.Y);//获取矩形的长和宽
if (e.X < DownPoint.X)
{
newPoint.X = e.X;
}
if (e.Y < DownPoint.Y)
{
newPoint.Y = e.Y;
}
CatchRect = new Rectangle(newPoint,new Size(width,height));//保存矩形
g.DrawRectangle(p,CatchRect);//将矩形画在这个画板上
g.Dispose();//释放目前的这个画板
p.Dispose();
Graphics g1 = this.CreateGraphics();//重新新建一个Graphics类
//如果之前那个画板不释放，而直接g=this.CreateGraphics()这样的话无法释放掉第一次创建的g,因为只是把地址转到新的g了．如同string一样
g1 = this.CreateGraphics();//在整个全屏窗体上新建画板
g1.DrawImage(destBmp,new Point(0,0));//将刚才所画的图片画到这个窗体上
//这个也可以属于二次缓冲技术，如果直接将矩形画在窗体上，会造成图片抖动并且会有无数个矩形．
g1.Dispose();
destBmp.Dispose();//要及时释放，不然内存将会被大量消耗
}
}
private void Catch_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
if (CatchStart)
{
CatchStart = false;
CatchFinished = true;
}
}
}
//鼠标双击事件，如果鼠标位于矩形内，则将矩形内的图片保存到剪贴板中
private void Catch_MouseDoubleClick(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left&&CatchFinished)
{
if (CatchRect.Contains(new Point(e.X, e.Y)))
{
Bitmap CatchedBmp = new Bitmap(CatchRect.Width, CatchRect.Height);//新建一个于矩形等大的空白图片
Graphics g = Graphics.FromImage(CatchedBmp);
g.DrawImage(originBmp, new Rectangle(0, 0, CatchRect.Width, CatchRect.Height), CatchRect, GraphicsUnit.Pixel);
//把orginBmp中的指定部分按照指定大小画在画板上
Clipboard.SetImage(CatchedBmp);//将图片保存到剪贴板
g.Dispose();
CatchFinished = false;
this.BackgroundImage = originBmp;
CatchedBmp.Dispose();
this.DialogResult = DialogResult.OK;
this.Close();
}
}
}
}
}
/*
C.创建了Catch窗体后，我们在截图按钮(位于聊天窗体上)上加入以下事件：
*/
private void bCatch_Click(object sender, EventArgs e)
{
if (bCatch_HideCurrent.Checked)
{
this.Hide();//隐藏当前窗体
Thread.Sleep(50);//让线程睡眠一段时间，窗体消失需要一点时间
Catch CatchForm = new Catch();
Bitmap CatchBmp = new Bitmap(Screen.AllScreens[0].Bounds.Width, Screen.AllScreens[0].Bounds.Height);//新建一个和屏幕大小相同的图片
Graphics g = Graphics.FromImage(CatchBmp);
g.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(Screen.AllScreens[0].Bounds.Width, Screen.AllScreens[0].Bounds.Height));//保存全屏图片
CatchForm.BackgroundImage = CatchBmp;//将Catch窗体的背景设为全屏时的图片
if (CatchForm.ShowDialog() == DialogResult.OK)
{//如果Catch窗体结束,就将剪贴板中的图片放到信息发送框中
IDataObject iData = Clipboard.GetDataObject();
DataFormats.Format myFormat = DataFormats.GetFormat(DataFormats.Bitmap);
if (iData.GetDataPresent(DataFormats.Bitmap))
{
richtextbox1.Paste(myFormat);
Clipboard.Clear();//清除剪贴板中的对象
}
this.Show();//重新显示窗体
}
}
}