C # winform Image Rendering and image verification code,

C # winform Image Rendering and image verification code,

Using System;
Using System. Collections. Generic;
Using System. ComponentModel;
Using System. Data;
Using System. Drawing;
Using System. Linq;
Using System. Text;
Using System. Windows. Forms;

Namespace WindowsFormsApplication1
{
Public partial class Form1: Form
{
Public Form1 ()
{
InitializeComponent ();
}

Private void Form1_Load (object sender, EventArgs e)
{
// One piece of paper, one pen, one person, two dots

}
// Draw a straight line
Private void Form1_Paint (object sender, PaintEventArgs e)
{
Graphics gp = this. CreateGraphics ();
Pen p = new Pen (Color. Blue );
Point p1 = new Point (100,100 );
Point p2 = new Point (100,300 );
Gp. DrawLine (p, p1, p2 );
}

// Draw multiple lines
Private void button#click (object sender, EventArgs e)
{
// Create a GDI + Object
Graphics g = this. CreateGraphics ();
// Create a paint brush object
Pen pen = new Pen (Color. Blue );
// Create two points
Point p1 = new Point (100,100 );
Point p2 = new Point (30,400 );
// Draw a straight line between p1 and p2 using a pen on the drawing board
G. DrawLine (pen, p1, p2 );
// Pos is a point array and multiple straight lines are drawn in the drawing board.
Point p3 = new Point (300,120 );
Point p4 = new Point (15,200 );
Point [] pos = {p1, p2, p3, p4 };
G. DrawLines (pen, pos );
}

// Draw a rectangle
Private void button2_Click (object sender, EventArgs e)
{
// Create a GDI + Object
Graphics gp = this. CreateGraphics ();
// Create the coordinate width and height of the upper left corner of the rectangle object
Rectangle rec = new Rectangle (new Point (100, 10), new Size (100,300 ));
Gp. DrawRectangle (new Pen (Color. Blue), rec );
}

// Fill the rectangle
Private void button3_Click (object sender, EventArgs e)
{
// Create a GDI + Object
Graphics gp = this. CreateGraphics ();
// Specify the rectangular object to be filled
Rectangle rec = new Rectangle (new Point (100, 10), new Size (100,300 ));
// Fill color to obtain the rectangle given by the system color to be filled
Gp. FillRectangle (Brushes. DarkGreen, rec );
}

// Draw slices and fill them
Private void button4_Click (object sender, EventArgs e)
{
// Create a GDI + Object
Graphics gp = this. CreateGraphics ();
// Specify the rectangular object to be filled
Rectangle rec = new Rectangle (new Point (100, 10), new Size (100,300 ));
// Draw the left angle of the right corner of the slice pen object rectangle
Gp. DrawPie (new Pen (Color. Red), rec, 60, 60 );
// Fill the slice to obtain the left angle of the right corner of the System Object rectangle
Gp. FillPie (Brushes. DarkGreen, rec, 60, 60 );
}

// Draw text
Private void button5_Click (object sender, EventArgs e)
{
// Create a GDI + Object
Graphics g = this. CreateGraphics ();
// Draw text font style: font size? Oblique ?... Obtains the coordinate point drawn by the system color.
G. DrawString ("Hello, China! ", New Font (" 文 ", 20, FontStyle. Italic), Brushes. Red, new Point (300,300 ));
}

// Verification Code
Private void picturebox#click (object sender, EventArgs e)
{
// Generate four random numbers between 1 and 9
Random r = new Random ();
String str = "";
For (int I = 0; I <4; I ++)
{
Int rNumber = r. Next (0, 10 );
// Accumulate to an empty string
Str + = rNumber;
}

// Create a GDI + Object
// Create an image object, specifying the width and height
Bitmap bm = new Bitmap (115,30 );;
// Create a new Grapics canvas from the specified Image object
Graphics g = Graphics. FromImage (bm );

// Font of the array
String [] fonts = {"", ""};
// Color of the array
Color [] colors = {Color. Red, Color. Yellow, Color. Pink, Color. Purple };
// Draw words
For (int I = 0; I <4; I ++)
{
// Specify coordinates
Point p = new Point (I * 20, 0 );
// Draw text
G. DrawString (str [I]. ToString (), new Font (fonts [I], 20, FontStyle. Italic), new SolidBrush (colors [I]), p );

}
// Draw a line
For (int j = 0; j <16; j ++)
{
Point p1 = new Point (r. Next (0, bm. Width), r. Next (bm. Height ));
Point p2 = new Point (r. Next (0, bm. Width), r. Next (0, bm. Height ));
G. DrawLine (new Pen (Color. Green), p1, p2 );
}
// Draw pixels
For (int I = 0; I <100; I ++)
{
Point p1 = new Point (r. Next (0, bm. Width), r. Next (bm. Height ));
Point p2 = new Point (r. Next (0, bm. Width), r. Next (0, bm. Height ));
Bm. SetPixel (p1.X, p1.Y, Color. Black );
}

// Set the bm image to pictureBox.
PictureBox1.Image = bm;
}
}
}