public static FontAndSize GetValue( Graphics g, String text, String fontFamily, int fontSize, int srcWidth )
{
FontAndSize wfont = new FontAndSize();
Font font = null;
SizeF size = new SizeF();
for (int i = fontSize; i > 6; i = i - 2) {
font = new Font( fontFamily, i, FontStyle.Bold );
size = g.MeasureString( text, font );
if (size.Width <= srcWidth) break;
}
wfont.font = font;
wfont.size = size;
return wfont;
}
/// <summary>
/// 将原始图片添加文字水印之后存储
/// </summary>
/// <param name="srcPath"></param>
/// <param name="savePath"></param>
/// <param name="words"></param>
/// <param name="wp"></param>
/// <param name="fontSize"></param>
public static void MakeByText(String srcPath, String savePath, String words, WatermarkPosition wp, int fontSize)
{
using (Image src = Image.FromFile(srcPath)) {
using (Bitmap bm = new Bitmap(srcPath)) {
using (Graphics g = Graphics.FromImage(bm)) {
FontAndSize fs = FontAndSize.GetValue(g, words, "arial", fontSize, src.Width);
PointF p = getTextPoint(src, fs.size, wp);
StringFormat sf = getStringFormat();
drawText(g, words, fs.font, p, sf);
try {
bm.Save(savePath);
}
catch (Exception e) {
throw e;
}
}
}
}
}
public static FontAndSize GetValue(Graphics g, String text, String fontFamily, int fontSize, int srcWidth)
{
FontAndSize wfont = new FontAndSize();
Font font = null;
SizeF size = new SizeF();
for (int i = fontSize; i > 6; i = i - 2)
{
font = new Font(fontFamily, i, FontStyle.Bold);
size = g.MeasureString(text, font);
if (size.Width <= srcWidth)
{
break;
}
}
wfont.font = font;
wfont.size = size;
return(wfont);
}
/// <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);
}
