Bitmap bmp = new Bitmap(3437, 2601, PixelFormat.Format32bppPArgb);
bmp.SetResolution(300, 300);
ImageFormat yy = bmp.RawFormat;
Graphics g = Graphics.FromImage(bmp);
Image img = new Bitmap("bg.jpg");
g.DrawImage(img, new Point(0, 50));
Image t = new Bitmap("t.jpg");
g.DrawImage(t, new Rectangle(500, 600, 1000, 1000));
Image png = new Bitmap("png.png");
ImageAttributes imga = new ImageAttributes();
ColorMap map = new ColorMap();
map.OldColor = Color.FromArgb(255, 0, 255, 0);
map.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] maps = { map };
imga.SetRemapTable(maps, ColorAdjustType.Bitmap);
/*
float[][] Matrix =
{
new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},
new float[] {0,0f, 0.0f, 0.0f, 0.3f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
};/*
* */
float[][] Matrix = {
new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.3f, 0.0f},
new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}
};
ColorMatrix ma = new ColorMatrix(Matrix);
imga.SetColorMatrix(ma, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
g.DrawImage(png, new Rectangle(600, 700, 200, 200), 0, 0, 200, 200, GraphicsUnit.Pixel, imga);
ImageFormat xx = bmp.RawFormat;
bmp.Save("rs.jpg", ImageFormat.Jpeg);
bmp.Dispose();
img.Dispose();
png.Dispose();
t.Dispose();
MessageBox.Show("ok");
2
public partial class Catch : Form
{
#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
public Catch()
{
InitializeComponent();
}
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
}
private void Catch_MouseClick(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Right)
{
this.DialogResult = DialogResult.OK;
this.Close();
}
}
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;
}
}
}
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();
}
}
}
}
private void button2_Click(object sender, EventArgs e)
{
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
}
}
3
Graphics g = this.CreateGraphics();
Pen p = new Pen(Color.Red, 1);
for (int i = 0; i < 30; i++)
{
g.RotateTransform(i);
g.DrawLine(p, 0, 0, 1000, 0);
g.ResetTransform();
}
//平移坐标轴
g.TranslateTransform(100, 100);
g.DrawLine(p, 0, 0, 100, 0);
g.ResetTransform();
//先平移到指定坐标,然后进行度旋转
g.TranslateTransform(100, 200);
for (int i = 0; i < 8; i++)
{
g.RotateTransform(45);
g.DrawLine(p, 0, 0, 100, 0);
}
g.Dispose();
Graphics g = this.CreateGraphics();
Rectangle rect = new Rectangle(10, 10, 500, 500);
SolidBrush b1 = new SolidBrush(Color.Black);
g.FillRectangle(b1, rect);
/*
g.DrawString("我爱你", new Font("微软雅黑", 90), b1, new PointF(90, 10));
TextureBrush b2 = new TextureBrush(Image.FromFile("OY1-024.JPG"));
rect.Location = new Point(100, 100);
rect.Width = 2000;
rect.Height = 2000;
g.FillRectangle(b2, rect);*/
rect.Location = new Point(400, 400);
LinearGradientBrush b3 = new LinearGradientBrush(rect, Color.BlueViolet, Color.Black, LinearGradientMode.ForwardDiagonal);
g.FillRectangle(b3, rect);
Pen p = new Pen(Color.Black, 5);
Graphics g = this.CreateGraphics();
p.DashStyle = DashStyle.Dot;
g.DrawLine(p, 10, 10, 200, 10);
p.DashPattern = new float[] { 3, 1 };
g.DrawLine(p, 10, 20, 200, 20);
p.DashStyle = DashStyle.Solid;
p.EndCap = LineCap.ArrowAnchor;
g.DrawLine(p, 10, 30, 200, 30);
g.Dispose();
p.Dispose();
4
Graphics g = e.Graphics;
Pen p = new Pen(Color.Aqua, 2);
g.DrawLine(p, 10, 20, 30, 400);
g.DrawRectangle(p, 10, 10, 100, 100);
g.DrawRectangle(p, 30, 20, 500, 600);
g.DrawEllipse(p, 50, 70, 200, 600);
5