cyf
121 lines
3.8 KiB
C#
121 lines
3.8 KiB
C#
using System;
|
|
using System.Collections.Generic;
|
|
using System.Text;
|
|
using System.Drawing;
|
|
using System.Drawing.Drawing2D;
|
|
|
|
namespace Zhaizj.Framework.Drawing {
|
|
|
|
/// <summary>
|
|
/// 验证码工具
|
|
/// </summary>
|
|
public class ValidationCode {
|
|
|
|
/// <summary>
|
|
/// 创建验证码，返回一个 Image 对象
|
|
/// </summary>
|
|
/// <param name="code"></param>
|
|
/// <param name="width"></param>
|
|
/// <param name="height"></param>
|
|
/// <param name="fontFamily"></param>
|
|
/// <returns></returns>
|
|
public Image CreateImage( String code, int width, int height, String fontFamily ) {
|
|
|
|
Bitmap bm = new Bitmap( width, height );
|
|
|
|
using (Graphics g = Graphics.FromImage( bm )) {
|
|
|
|
g.SmoothingMode = SmoothingMode.AntiAlias;
|
|
|
|
HatchBrush brush = new HatchBrush( HatchStyle.SmallConfetti, Color.LightGray, Color.White );
|
|
Rectangle rect = new Rectangle( 0, 0, width, height );
|
|
g.FillRectangle( brush, rect );
|
|
|
|
int fontsize = rect.Height + 1;
|
|
FontAndSize size = FontAndSize.GetValue( g, code, fontFamily, fontsize, bm.Width );
|
|
|
|
GraphicsPath gpath = getGraphicsPath( code, size.font, rect );
|
|
|
|
Color brushColor = ColorTranslator.FromHtml( "#000000" );
|
|
brush = new HatchBrush( HatchStyle.Divot, brushColor, Color.DarkGray );
|
|
g.FillPath( brush, gpath );
|
|
|
|
addRandomNoise( g, rect );
|
|
|
|
}
|
|
return bm;
|
|
}
|
|
|
|
private void addRandomNoise( Graphics g, Rectangle rect ) {
|
|
|
|
HatchBrush brush = new HatchBrush( HatchStyle.Weave, Color.LightGray, Color.White );
|
|
|
|
for (int i = 0; i < (int)(rect.Width * rect.Height / 30F); i++) {
|
|
int x = rd.Next( rect.Width );
|
|
int y = rd.Next( rect.Height );
|
|
g.FillEllipse( brush, x, y, 2, 3 );
|
|
}
|
|
}
|
|
|
|
private Rectangle addRandomLine( Graphics g, Rectangle rect ) {
|
|
int lineCount = rd.Next( 1, 8 );
|
|
for (int i = 0; i < lineCount; i++) {
|
|
|
|
Point pt1 = new Point();
|
|
pt1.X = rd.Next( rect.Width );
|
|
pt1.Y = rd.Next( rect.Height );
|
|
|
|
Point pt2 = new Point();
|
|
pt2.X = rd.Next( rect.Width );
|
|
pt2.Y = rd.Next( rect.Height );
|
|
|
|
float width = rd.Next( 2 );
|
|
|
|
Pen p = new Pen( Color.Aqua, width );
|
|
g.DrawLine( p, pt1, pt2 );
|
|
}
|
|
return rect;
|
|
}
|
|
|
|
private StringFormat getFormat() {
|
|
StringFormat format = new StringFormat();
|
|
format.Alignment = StringAlignment.Center;
|
|
format.LineAlignment = StringAlignment.Center;
|
|
return format;
|
|
}
|
|
|
|
private GraphicsPath getGraphicsPath( String code, Font font, Rectangle rect ) {
|
|
|
|
StringFormat format = getFormat();
|
|
|
|
GraphicsPath path = new GraphicsPath();
|
|
path.AddString( code, font.FontFamily, (int)font.Style, font.Size, rect, format );
|
|
|
|
PointF[] points = getRandomPoint( rect );
|
|
|
|
Matrix matrix = new Matrix();
|
|
matrix.Translate( 0F, 0F );
|
|
|
|
path.Warp( points, rect, matrix, WarpMode.Perspective, 0F );
|
|
|
|
return path;
|
|
}
|
|
|
|
private PointF[] getRandomPoint( Rectangle rect ) {
|
|
float v = 4F;
|
|
PointF[] points =
|
|
{
|
|
new PointF(rd.Next(rect.Width) / v, rd.Next(rect.Height) / v),
|
|
new PointF(rect.Width - rd.Next(rect.Width) / v, rd.Next(rect.Height) / v),
|
|
new PointF(rd.Next(rect.Width) / v, rect.Height - rd.Next(rect.Height) / v),
|
|
new PointF(rect.Width - rd.Next(rect.Width) / v, rect.Height - rd.Next(rect.Height) / v)
|
|
};
|
|
return points;
|
|
}
|
|
|
|
private Random rd = new Random();
|
|
|
|
}
|
|
|
|
}
|