// 2016/10/5 改造为利用下级 Bitmap 函数
// parameters:
// nWidth 控制折行的位置
public static MemoryStream BuildArtText(
string strText,
string strFontFace,
float fFontSize,
FontStyle fontstyle,
Color colorText,
Color colorBack,
Color colorShadow,
ArtEffect effect,
ImageFormat imageformat,
int nWidth = 500)
{
// 正式的图像
using (Bitmap bitmapDest = BuildArtText(strText,
strFontFace,
fFontSize,
fontstyle,
colorText,
colorBack,
colorShadow,
effect,
nWidth))
{
MemoryStream stream = new MemoryStream();
if (imageformat == ImageFormat.Png &&
colorBack == Color.Transparent)
{
bitmapDest.MakeTransparent(colorBack);
}
if (imageformat == ImageFormat.Gif)
{
bitmapDest.MakeTransparent(
colorBack);
OctreeQuantizer quantizer = new OctreeQuantizer(255, 8);
quantizer.TransparentColor = colorBack;
using (Bitmap quantized = quantizer.Quantize(bitmapDest))
{
quantized.Save(stream, imageformat);
}
}
else
{
bitmapDest.Save(stream, imageformat); // System.Drawing.Imaging.ImageFormat.Jpeg
}
return(stream);
}
}
// max_width 100% 50%
// x "center" "0" "width"
public static MemoryStream PaintText(
string strSourceFileName,
string strText,
TextInfo info,
string s_x,
string s_y,
string s_max_width,
string s_max_height,
ImageFormat imageformat)
{
SizeF size;
using (Image source = Image.FromFile(strSourceFileName))
{
int width = source.Width;
int height = source.Height;
int x = 0;
if (s_x != "center")
{
x = GetValue(s_x,
width,
width,
height);
}
int y = GetValue(s_y,
height,
width,
height);
int max_width = GetValue(s_max_width,
width,
width,
height);
int max_height = GetValue(s_max_height,
height,
width,
height);
Font font = null;
try
{
using (Bitmap bitmapTemp = new Bitmap(1, 1))
{
using (Graphics graphicsTemp = Graphics.FromImage(bitmapTemp))
{
int text_height = (int)((float)max_height * 0.8);
// 第一次测算，按照最大高度
font = new Font(info.FontFace, text_height, info.fontstyle, GraphicsUnit.Pixel);
size = graphicsTemp.MeasureString(
strText,
font);
int width_delta = (int)size.Width - max_width;
if (width_delta > 0)
{
int nFontHeight = (int)((float)text_height * ((float)max_width / size.Width));
if (font != null)
{
font.Dispose();
}
font = new Font(info.FontFace, nFontHeight, info.fontstyle, GraphicsUnit.Pixel);
y += (text_height - nFontHeight) / 2;
}
if ((info.effect & ArtEffect.Shadow) == ArtEffect.Shadow)
{
size.Height += 2;
size.Width += 2;
}
}
}
// 正式的图像
using (Bitmap bitmapDest = new Bitmap(
source.Width, // (int)size.Width + 1,
Math.Max(source.Height, y + max_height), // (int)size.Height + 1,
PixelFormat.Format64bppPArgb))
{
using (Graphics objGraphics = Graphics.FromImage(bitmapDest))
{
objGraphics.Clear(info.colorBack);// Color.Transparent
objGraphics.DrawImageUnscaled(source, new Point(0, 0));
//
objGraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
// System.Drawing.Text.TextRenderingHint oldrenderhint = objGraphics.TextRenderingHint;
//设置高质量,低速度呈现平滑程度
objGraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
objGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
StringFormat stringFormat = new StringFormat();
if (s_x == "center")
{
stringFormat.Alignment = StringAlignment.Center;
x = 0;
size.Width = source.Width;
}
else
{
stringFormat.Alignment = StringAlignment.Near;
}
using (Brush objBrush = new SolidBrush(info.colorText)) // 透明颜色 ' Color.Black
{
RectangleF rect = new RectangleF(x,
y,
size.Width,
size.Height);
if ((info.effect & ArtEffect.Shadow) == ArtEffect.Shadow)
{
using (Brush objBrushShadow = new SolidBrush(info.colorShadow))
{
RectangleF rectShadow = new RectangleF(rect.X,
rect.Y, rect.Width, rect.Height);
rectShadow.Offset(2, 2);
objGraphics.DrawString(strText,
font,
objBrushShadow,
rectShadow,
stringFormat);
}
}
objGraphics.DrawString(strText,
font,
objBrush,
rect,
stringFormat);
}
MemoryStream stream = new MemoryStream();
if (imageformat == ImageFormat.Gif)
{
bitmapDest.MakeTransparent(
info.colorBack);
OctreeQuantizer quantizer = new OctreeQuantizer(255, 8);
quantizer.TransparentColor = info.colorBack;
using (Bitmap quantized = quantizer.Quantize(bitmapDest))
{
quantized.Save(stream, imageformat);
}
}
else
{
bitmapDest.Save(stream, imageformat); // System.Drawing.Imaging.ImageFormat.Jpeg
}
return(stream);
}
}
}
finally
{
if (font != null)
{
font.Dispose();
}
}
}
}
// parameters:
// nWidth 控制折行的位置
public static MemoryStream BuildArtText(
string strText,
string strFontFace,
float fFontSize,
FontStyle fontstyle,
Color colorText,
Color colorBack,
Color colorShadow,
ArtEffect effect,
ImageFormat imageformat,
int nWidth = 500)
{
SizeF size;
using (Font font = new Font(strFontFace, fFontSize, fontstyle))
{
using (Bitmap bitmapTemp = new Bitmap(1, 1))
{
using (Graphics graphicsTemp = Graphics.FromImage(bitmapTemp))
{
size = graphicsTemp.MeasureString(
strText,
font,
nWidth);
if ((effect & ArtEffect.Shadow) == ArtEffect.Shadow)
{
size.Height += 2;
size.Width += 2;
}
}
}
// 正式的图像
using (Bitmap bitmapDest = new Bitmap((int)size.Width + 1, (int)size.Height + 1, PixelFormat.Format64bppPArgb))
{
using (Graphics objGraphics = Graphics.FromImage(bitmapDest))
{
// colorBack = Color.FromArgb(0, colorBack);
objGraphics.Clear(colorBack);// Color.Transparent
//
objGraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
// System.Drawing.Text.TextRenderingHint oldrenderhint = objGraphics.TextRenderingHint;
//设置高质量,低速度呈现平滑程度
objGraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
objGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
// objGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
StringFormat stringFormat = new StringFormat();
stringFormat.Alignment = StringAlignment.Near;
stringFormat.LineAlignment = StringAlignment.Center; // 2016/5/24
// Color.FromArgb(128, 100, 100, 100)
using (Brush objBrush = new SolidBrush(colorText)) // 透明颜色 ' Color.Black
{
RectangleF rect = new RectangleF(0, 0, size.Width, size.Height);
if ((effect & ArtEffect.Shadow) == ArtEffect.Shadow)
{
using (Brush objBrushShadow = new SolidBrush(colorShadow))
{
RectangleF rectShadow = new RectangleF(rect.X,
rect.Y, rect.Width, rect.Height);
rectShadow.Offset(2, 2);
objGraphics.DrawString(strText,
font,
objBrushShadow,
rectShadow,
stringFormat);
}
}
objGraphics.DrawString(strText,
font,
objBrush,
rect,
stringFormat);
}
}
MemoryStream stream = new MemoryStream();
/*
* stream = SaveGIFWithNewColorTable(
* bitmapDest,
* 256,
* true);
*/
if (imageformat == ImageFormat.Png &&
colorBack == Color.Transparent)
{
bitmapDest.MakeTransparent(colorBack);
}
if (imageformat == ImageFormat.Gif)
{
bitmapDest.MakeTransparent(
colorBack);
OctreeQuantizer quantizer = new OctreeQuantizer(255, 8);
quantizer.TransparentColor = colorBack;
using (Bitmap quantized = quantizer.Quantize(bitmapDest))
{
quantized.Save(stream, imageformat);
}
}
else
{
bitmapDest.Save(stream, imageformat); // System.Drawing.Imaging.ImageFormat.Jpeg
}
return(stream);
}
}
}
