C#实现封面图片生成器的示例代码

这个东西我已经用了有段时间了，从开始写文章就在用这个，主要原因还是因为我比较懒。懒得去寻找图片，同时又怕万一惹来版权争议。。。

图片[1] - C#实现封面图片生成器的示例代码 - 尘心网

跟我所有的文章的封面图一样，一个纯色背景加上文字自动生成一个指定大小的图片。

代码实现也比较简单，如果有兴趣的话，可以自己扩展，比如自定义背景图，自定义水印等。

实现功能

利用C#做一个简单的封面图片生成器

开发环境

开发工具： Visual Studio 2013

.NET Framework版本：4.5

实现代码

   private void Img_Load(object sender, EventArgs e)
{
init();
}
private void btnBg_Click(object sender, EventArgs e)
{
ColorDialog cd = new ColorDialog();
if (cd.ShowDialog() == DialogResult.OK)
{
panelBgColor.BackColor = cd.Color;
}
}
private void btnFontColor1_Click(object sender, EventArgs e)
{
ColorDialog cd = new ColorDialog();
if (cd.ShowDialog() == DialogResult.OK)
{
panelFontColor1.BackColor = cd.Color;
}
}
private void btnFontColor2_Click(object sender, EventArgs e)
{
ColorDialog cd = new ColorDialog();
if (cd.ShowDialog() == DialogResult.OK)
{
panelFontColor2.BackColor = cd.Color;
}
}
private void btnFont_Click(object sender, EventArgs e)
{
FontDialog fd = new FontDialog();
fd.Font = txtFont.Font;
if (fd.ShowDialog() == DialogResult.OK)
{
txtFont.Font = fd.Font;
}
}
private void btnPre_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(txtWord.Text))
{
MessageBox.Show("请先设置文字", "提示");
return;
}
MemoryStream stream = new MemoryStream(CreateIamge(txtWord.Text));
pictureBox1.Image = Image.FromStream(stream, true);
}
private void btnSave_Click(object sender, EventArgs e)
{
if (pictureBox1.Image == null)
{
MessageBox.Show("请先预览", "提示");
return;
}
SaveFileDialog sfd = new SaveFileDialog();
sfd.SupportMultiDottedExtensions = true;
sfd.Filter = "PNG格式|*.png|JPG格式|*.jpg";
sfd.AddExtension = true;
if (sfd.ShowDialog() == DialogResult.OK)
{
EncoderParameters myEncoderParameters = new EncoderParameters(1);
myEncoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, 100L);
pictureBox1.Image.Save(sfd.FileName, GetEncoderInfo("image/png"), myEncoderParameters);
}
}
private void init()
{
Font font = new Font("华文行楷", 36, FontStyle.Bold);
txtFont.Font = font;
panelFontColor1.BackColor = ColorTranslator.FromHtml("#ff0080ff");
panelFontColor2.BackColor = ColorTranslator.FromHtml("#ffff80c0");
}
public byte[] CreateIamge(string str)
{
int w = Convert.ToInt32(txtWidth.Text);
int h = Convert.ToInt32(txtHeight.Text);
//渐变画笔
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, w, h), panelFontColor1.BackColor, panelFontColor2.BackColor, 25f, true);
Bitmap image = new Bitmap(w, h);
Graphics g = Graphics.FromImage(image);
//设置高质量插值法   
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
//设置高质量,低速度呈现平滑程度   
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
//消除锯齿 
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
//填充背景色
g.FillRectangle(new SolidBrush(panelBgColor.BackColor), new Rectangle(0, 0, w, h));
//设置文本呈现方式
g.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
//获取文字大小
SizeF sf = g.MeasureString(str, txtFont.Font);
g.DrawString(str, txtFont.Font, brush, (w - sf.Width) / 2, (h - sf.Height) / 2);
MemoryStream stream = new MemoryStream();
//高质量保存
EncoderParameters myEncoderParameters = new EncoderParameters(1);
myEncoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, 100L);
image.Save(stream, GetEncoderInfo("image/png"), myEncoderParameters);
byte[] buffer = stream.ToArray();
g.Dispose();
image.Dispose();
return buffer;
}
private static ImageCodecInfo GetEncoderInfo(String mimeType)
{
int j;
ImageCodecInfo[] encoders;
encoders = ImageCodecInfo.GetImageEncoders();
for (j = 0; j < encoders.Length; ++j)
{
if (encoders[j].MimeType == mimeType)
return encoders[j];
}
return null;
}