1.图片缩放

using System;
using System.Windows.Forms;
using System.Drawing;
class haha : Form
{static void Main(){Application.Run(new haha());}Bitmap bit;int x, y;haha(){ClientSize = new Size(400, 400);bit = new Bitmap(800, 800);Graphics.FromImage(bit).DrawImage(Image.FromFile("beauty.jpg"),new Rectangle(new Point(0,0),new Size(bit.Width,bit.Height)));KeyDown += roll;MouseWheel += zoom;x = y = 0;}void zoom(object o, MouseEventArgs e){if ((bit.Width < 100||bit.Height<100)&&e.Delta<0) return;if (bit.Width + e.Delta < 0 || bit.Height + e.Delta < 0) return;Bitmap b = new Bitmap(bit.Width + e.Delta, bit.Height + e.Delta);Graphics.FromImage(b).DrawImage(bit, new Rectangle(0, 0, b.Width, b.Height));bit = b;draw();}void draw(){if (x >= bit.Width - ClientSize.Width) x = bit.Width - 1 - ClientSize.Width;if (y >= bit.Height - ClientSize.Height) y = bit.Height - ClientSize.Height - 1;if (x < 0) x = 0;if (y < 0) y = 0;Bitmap b = new Bitmap(ClientSize.Width, ClientSize.Height);int i, j;for (i = 0; i < ClientSize.Width; i++)for (j = 0; j < ClientSize.Height; j++){if (x + i >= bit.Width || y + j >= bit.Height)b.SetPixel(i, j, Color.AliceBlue);else b.SetPixel(i, j, bit.GetPixel(x + i, y + j));}CreateGraphics().DrawImage(b, 0, 0);}void roll(object o, KeyEventArgs e){switch (e.KeyCode){case Keys.Up: y -= 10; break;case Keys.Down: y += 10; break;case Keys.Right: x += 10; break;case Keys.Left: x -= 10; break;}draw();}
}

2.位图操作-乱画

using System.Drawing;
using System.Windows.Forms;
using System;
class haha:Form
{Bitmap bit;Random r = new Random();static void Main(){Application.Run(new haha());}void circle(int xx, int yy, int r,Color c){int x; double y;for (x = xx - r; x < xx + r; x++){y = Math.Sqrt(r * r - (xx - x) * (xx - x));if (x < 0 || yy - y < 0 || x >= bit.Width || yy + y >= bit.Height) continue;bit.SetPixel(x, (int)(y+yy), c);bit.SetPixel(x, (int)( yy-y), c);}}void line(int x1,int y1,int x2,int y2,Color c){int fx, fy, tx, ty;if(x1==x2){if(y1>y2){fx=x2;fy=y2;tx=x1;ty=y1;}else {fx=x1;fy=y1;tx=x2;ty=y2;}int i;for (i = fy; i < ty; i++){bit.SetPixel(x1, i, c);}CreateGraphics().DrawImage(bit,0,0);return;}if (x1 > x2){fx = x2; fy = y2;tx = x1; ty = y1;}else{fx = x1; fy = y1;tx = x2; ty = y2;}double k = (ty - fy) / (tx - fx);double y;int x;for (x = fx; x < tx; x++){y = k * x + ((double)y1 - k * x1);bit.SetPixel(x, (int)y, c);}CreateGraphics().DrawImage(bit, 0, 0);}haha(){ClientSize = new Size(500, 500);bit = new Bitmap(ClientSize.Width, ClientSize.Height);Graphics.FromImage(bit).Clear(Color.White);Timer t1 = new Timer();t1.Interval = 5000;t1.Tick += draw_line;//t1.Start();Timer t2 = new Timer();t2.Interval = 10;t2.Tick += draw_circle;t2.Start();}void draw_line(object o,EventArgs e){line(r.Next()%ClientSize.Width, r.Next()%ClientSize.Height, r.Next()%ClientSize.Width, r.Next()%ClientSize.Height, Color.FromArgb(r.Next()));}void draw_circle(object o, EventArgs e){int rr=r.Next() % 100 + 1;int xx=r.Next() % ClientSize.Width;int yy=r.Next() % ClientSize.Height;for (int i = 0; i < 16&&rr>i;i++ )circle(xx,yy , rr-i, Color.FromArgb(r.Next()));CreateGraphics().DrawImage(bit, 0, 0);}
}

3.图片旋转

    public partial class Form1 : Form{public Form1(){InitializeComponent();KeyDown += draw;bitmap = new Bitmap(Image.FromFile("0.jpg"));ClientSize = new Size(700,700);}Bitmap rotate(Bitmap source){Bitmap bit = new Bitmap(source.Height, source.Width);for (int x = 0; x < bit.Width; x++){for (int y = 0; y < bit.Height; y++){bit.SetPixel(x, y, source.GetPixel(bit.Height- y-1, x));}}return bit;}Bitmap bitmap;void draw(object o, EventArgs e){CreateGraphics().Clear(Color.Black);bitmap = rotate(bitmap);CreateGraphics().DrawImage(bitmap, 0, 0);}}

4.鼠标单击拖动图片

using System;
using System.Windows.Forms;
using System.Drawing;
class window : Form
{Rectangle rec=new Rectangle(23,23,23,23);Bitmap b=new Bitmap("beauty.jpg");int x, y;int dx, dy;bool move;public window(){MouseClick +=click;MouseMove += OnMove;Paint += paint;Size = new Size(800,800);x = y = 0;}void OnMove(object o, MouseEventArgs e){if (move){Bitmap bit = new Bitmap(Width,Height);Graphics g = Graphics.FromImage(bit);g.Clear(Color.AliceBlue);g.DrawImage(b, e.X+dx, e.Y+dy);for (int i = 10; i < bit.Width; i++)bit.SetPixel(i, 100, Color.Red);CreateGraphics().DrawImage(bit, 0, 0);}}void paint(object o, EventArgs e){CreateGraphics().DrawImage(b,0,0);}void click(object o, MouseEventArgs e){if (e.X > x && e.X < x + b.Width && e.Y > y && e.Y < y + b.Height && move == false) { move = true; dx = x - e.X; dy = y - e.Y; }else if (move == true){x = e.X+dx; y = e.Y+dy;move = false;}}public static void Main(){  Application.Run(new window());}
}

5.没有边框的窗口

    public partial class Form1 : Form{public Form1(){ClientSize = Screen.PrimaryScreen.Bounds.Size;FormBorderStyle = FormBorderStyle.None;Paint += draw;TransparencyKey = DefaultBackColor;ShowInTaskbar = false;}void draw(object o, EventArgs e){CreateGraphics().Clear(DefaultBackColor);Bitmap bit=new Bitmap(ClientSize.Width,ClientSize.Height);bit.MakeTransparent(Color.White);Graphics.FromImage(bit).DrawString("东大微雕\n文韬武略\n天下第一", new Font(new FontFamily("Consolas"),200,GraphicsUnit.Pixel),new SolidBrush(Color.Red),new Rectangle(30,30,ClientRectangle.Right,ClientRectangle.Bottom));//BackgroundImage = bit;//释放上面这句就会导致闪烁CreateGraphics().DrawImage(bit,ClientRectangle);}}

6.全屏的窗口

    public partial class Form1 : Form{public Form1(){InitializeComponent();Size = MaximumSize;WindowState = FormWindowState.Maximized;FormBorderStyle = FormBorderStyle.None;Paint += paint;files= Directory.GetFiles(Directory.GetCurrentDirectory(),"*.jpg");KeyDown += down;}void down(object o, KeyEventArgs e){index++;Invalidate();}string[] files;int index=0;void paint(object o, PaintEventArgs e){Bitmap bit = new Bitmap(ClientSize.Width,ClientSize.Height);Graphics.FromImage(bit).DrawImage(Image.FromFile(files[index%files.Length]), ClientRectangle);e.Graphics.DrawImage(bit,0,0);}}

7.分工演示器

    public partial class Form1 : Form{SpeechSynthesizer teller = new SpeechSynthesizer();void tell(string s){teller.Speak(s);}void crossLine(int from, int to){int w = bit.Width / (size + 1);int h = bit.Height / (size + 1);Graphics g = Graphics.FromImage(bit);Pen p = new Pen(new SolidBrush(Color.Gold),4);g.DrawLine(p, work[from] * w + w + w / 2, from * h + h + h / 2, work[to] * w + w + w / 2, to * h + h + h / 2);g.DrawLine(p, work[to] * w + w + w / 2, from * h + h + h / 2, work[from] * w + w + w / 2, to * h + h + h / 2);CreateGraphics().DrawImage(bit,0,0);}void go(){int i, j;bool changed = true;while (changed){tell("只要有变化,那就接着调整.调整哇调整,一直到没法再调整了");changed = false;for (i = 0; i < size; i++){for (j = size - 1; j >= 0; j--){if (a[i, work[j]] + a[j, work[i]] < a[i, work[i]] + a[j, work[j]]){crossLine(i, j);tell("工人" + man[i] + "干任务" + (char)(work[i] + 'A') + "需要" + a[i, work[i]] + "的时间");tell("工人" + man[j] + "干任务" + (char)(work[j] + 'A') + "需要" + a[j, work[j]] + "的时间");tell("他们交换一下任务,岂不是更快");int temp = work[i];work[i] = work[j];work[j] = temp;draw();changed = true;}}}}}int[] work;public Form1(){InitializeComponent();WindowState = FormWindowState.Maximized;Text = "分工演示器-written for jiege,made by weidiao";var set = teller.GetInstalledVoices();teller.SelectVoice(set[0].VoiceInfo.Name);init();Paint += delegate{draw();go();tell("杰哥,你可以百度一下模拟淬火算法,这种方法适用于解决NP问题,但它的缺点就是最后所求的结果不一定对");tell("这种方法能够保证得到局部最优解,至于有多么接近最优解,这取决于你所选择的初始值");tell("于是,我们可以大量的用很多初始值进行迭代优化,从中选取最好的");};Resize += delegate{bit = new Bitmap(this.ClientSize.Width, this.ClientSize.Height);draw();};}Bitmap bit;char[] man = "甲乙丙丁戊己庚辛壬癸".ToCharArray();void draw(){Graphics g = Graphics.FromImage(bit);g.Clear(Color.Black);int i, j;int w = bit.Width / (size + 1);int h = bit.Height / (size + 1);g.FillRectangle(new SolidBrush(Color.Gray), new Rectangle(0, 0, w - 2, h - 2));g.DrawLine(new Pen(new SolidBrush(Color.Black), 2), 0, 0, w, h);g.DrawString("任务", new Font("楷体", 20, FontStyle.Bold), new SolidBrush(Color.Crimson), new RectangleF(w / 2, 0, w / 2, h / 2));g.DrawString("人物", new Font("楷体", 20, FontStyle.Bold), new SolidBrush(Color.DarkOrange), new RectangleF(0, h / 2, w / 2, h / 2));for (i = 0; i < size; i++){RectangleF rec = new RectangleF(w + w * i, 0, w - 2, h - 2);g.FillRectangle(new SolidBrush(Color.Gray), rec);g.DrawString((char)(i + 'A') + "", new Font("Consolas", 40, FontStyle.Bold), new SolidBrush(Color.Crimson), rec);}for (i = 0; i < size; i++){RectangleF rec = new RectangleF(0, h + i * h, w - 2, h - 2);g.FillRectangle(new SolidBrush(Color.Gray), rec);g.DrawString(man[i] + "", new Font("Consolas", 40, FontStyle.Bold), new SolidBrush(Color.DarkOrange), rec);}for (i = 0; i < size; i++){for (j = 0; j < size; j++){RectangleF rec = new RectangleF(j * w + w, h + i * h, w - 2, h - 2);Color back = work[i] == j ? Color.Gainsboro : Color.Gray;g.FillRectangle(new SolidBrush(back), rec);g.DrawString(a[i, j] + "", new Font("Consolas", 40, FontStyle.Bold), new SolidBrush(Color.Red), rec);}}CreateGraphics().DrawImage(bit, 0, 0);}int[,] a;Random r = new Random();int size;void init(){size = 4;a = new int[size, size];work = new int[size];int i, j;for (i = 0; i < size; i++) work[i] = i;for (i = 0; i < size; i++){for (j = 0; j < size; j++){a[i, j] = r.Next() % 20 + 2;}}}}