C#winform picture Drawing 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)
{
A piece of paper, a pen, a man, two points.

}
Draw a 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 Multi-line lines
private void Button1_Click (object sender, EventArgs e)
{
Create a GDI + object
Graphics g = this. CreateGraphics ();
Create a 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 line between P1 and P2 two points in the artboard using a pen
G.drawline (pen, p1, p2);
POS is a point array, drawing multiple lines in the artboard
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 GDI + objects
Graphics GP = this. CreateGraphics ();
Create a Rectangle object upper left angle seat width height
Rectangle rec = new Rectangle (new point), New Size (100, 300));
Gp. DrawRectangle (New Pen (Color.Blue), rec);
}

Fill Rectangle
private void Button3_Click (object sender, EventArgs e)
{
Create GDI + objects
Graphics GP = this. CreateGraphics ();
Given the rectangle object to fill
Rectangle rec = new Rectangle (new point), New Size (100, 300));
Fill color get system color given the rectangle to fill
Gp. FillRectangle (Brushes.darkgreen, rec);
}

Draw a fan, and fill
private void Button4_Click (object sender, EventArgs e)
{
Create GDI + objects
Graphics GP = this. CreateGraphics ();
Given the rectangle object to fill
Rectangle rec = new Rectangle (new point), New Size (100, 300));
Draw Sector Pen Object rectangle Right Angle left angle
Gp. Drawpie (New Pen (color.red), REC, 60, 60);
Fill sector get System object Rectangle right Angle left angle
Gp. FillPie (Brushes.darkgreen, REC, 60, 60);
}

Drawing text
private void Button5_click (object sender, EventArgs e)
{
Create GDI + objects
Graphics g = this. CreateGraphics ();
Draw text text font style: Font size style bold? Oblique? ... Gets the seat punctuation that the system color draws to
g.DrawString ("Hello China!", New Font ("Chinese Xingkai", "Fontstyle.italic"), Brushes.Red, New Point (300, 300));
}

Verification Code
private void PictureBox1_Click (object sender, EventArgs e)
{
Generate 4 random numbers from 1 to 9
Random r = new Random ();
String str = "";
for (int i = 0; i < 4; i++)
{
int rnumber = r.next (0, 10);
Accumulate into an empty string
str + = Rnumber;
}

Create GDI + objects
Create a Picture object, specify width and height
Bitmap BM = new Bitmap (115,30);
Creates a new grapics artboard from the specified image object
Graphics g = graphics.fromimage (BM);

Array Store Font
string[] fonts = {"Bold", "Microsoft Black", "Official script", "italics"};
Array storage Color
color[] colors = {Color.red,color.yellow,color.pink,color.purple};
Stooped
for (int i = 0; i < 4; i++)
{
Specify the coordinates
Point P = new Point (i*20,0);
Drawing text
g.DrawString (Str[i]. ToString (), New Font (Fonts[i], fontstyle.italic), New SolidBrush (Colors[i]), p);

}
Draw Line
for (int j = 0; J <; 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);
}
Portrait point
for (int i = 0; i <; 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 directly onto the PictureBox.
pictureBox1.Image = BM;
}
}
}

C#winform picture Drawing and image verification code