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失落的神庙 2013-12-25
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只能 WndProc
zhou1132540 2013-12-25
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大神。求源码。。小弟给跪了。。
失落的神庙 2013-12-25
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class TextShadow
{
private int radius = 5;
private int distance = 10;
private double angle = 60;
private byte alpha = 192;
/// <summary>
/// 高斯卷积矩阵
/// </summary>
private int[] gaussMatrix;
/// <summary>
/// 卷积核
/// </summary>
private int nuclear = 0;
/// <summary>
/// 阴影半径
/// </summary>
public int Radius
{
get
{
return radius;
}
set
{
if (radius != value)
{
radius = value;
MakeGaussMatrix();
}
}
}
/// <summary>
/// 阴影距离
/// </summary>
public int Distance
{
get
{
return distance;
}
set
{
distance = value;
}
}
/// <summary>
/// 阴影输出角度(左边平行处为0度。顺时针方向)
/// </summary>
public double Angle
{
get
{
return angle;
}
set
{
angle = value;
}
}
/// <summary>
/// 阴影文字的不透明度
/// </summary>
public byte Alpha
{
get
{
return alpha;
}
set
{
alpha = value;
}
}
/// <summary>
/// 对文字阴影位图按阴影半径计算的高斯矩阵进行卷积模糊
/// </summary>
/// <param name="bmp">文字阴影位图</param>
private unsafe void MaskShadow(Bitmap bmp)
{
if (nuclear == 0)
MakeGaussMatrix();
Rectangle r = new Rectangle(0, 0, bmp.Width, bmp.Height);
// 克隆临时位图，作为卷积源
Bitmap tmp = (Bitmap)bmp.Clone();
BitmapData dest = bmp.LockBits(r, ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
BitmapData source = tmp.LockBits(r, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
try
{
// 源首地址(0, 0)的Alpha字节，也就是目标首像素的第一个卷积乘数的像素点
byte* ps = (byte*)source.Scan0;
ps += 3;
// 目标地址为卷积半径点(radius, radius)的Alpha字节
byte* pd = (byte*)dest.Scan0;
pd += (radius * (dest.Stride + 4) + 3);
// 位图实际卷积的部分
int width = dest.Width - radius * 2;
int height = dest.Height - radius * 2;
int matrixSize = radius * 2 + 1;
// 卷积矩阵字节偏移
int mOffset = dest.Stride - matrixSize * 4;
// 行尾卷积半径(radius)的偏移
int rOffset = radius * 8;
int count = matrixSize * matrixSize;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
byte* s = ps - mOffset;
int v = 0;
for (int i = 0; i < count; i++, s += 4)
{
if ((i % matrixSize) == 0)
s += mOffset; // 卷积矩阵的换行
v += gaussMatrix[i] * *s; // 位图像素点Alpha的卷积值求和
}
// 目标位图被卷积像素点Alpha等于卷积和除以卷积核
*pd = (byte)(v / nuclear);
pd += 4;
ps += 4;
}
pd += rOffset;
ps += rOffset;
}
}
finally { }
}
/// <summary>
/// 按给定的阴影半径生成高斯卷积矩阵
/// </summary>
protected virtual void MakeGaussMatrix()
{
double Q = (double)radius / 2.0;
if (Q == 0.0)
Q = 0.1;
int n = radius * 2 + 1;
int index = 0;
nuclear = 0;
gaussMatrix = new int[n * n];
for (int x = -radius; x <= radius; x++)
{
for (int y = -radius; y <= radius; y++)
{
gaussMatrix[index] = (int)Math.Round(Math.Exp(-((double)x * x + y * y) / (2.0 * Q * Q)) /
(2.0 * Math.PI * Q * Q) * 1000.0);
nuclear += gaussMatrix[index];
index++;
}
}
}
public TextShadow()
{
//
// TODO: Add constructor logic here
//
}
/// <summary>
/// 画文字阴影
/// </summary>
/// <param name="g">画布</param>
/// <param name="text">文字串</param>
/// <param name="font">字体</param>
/// <param name="layoutRect">文字串的布局矩形</param>
/// <param name="format">文字串输出格式</param>
public void Draw(Graphics g, string text, Font font, RectangleF layoutRect, StringFormat format)
{
RectangleF sr = new RectangleF((float)(radius * 2), (float)(radius * 2), layoutRect.Width, layoutRect.Height);
// 根据文字布局矩形长宽扩大文字阴影半径4倍建立一个32位ARGB格式的位图
Bitmap bmp = new Bitmap((int)sr.Width + radius * 4, (int)sr.Height + radius * 4, PixelFormat.Format32bppArgb);
// 按文字阴影不透明度建立阴影画刷
Brush brush = new SolidBrush(Color.FromArgb(alpha, Color.Black));
Graphics bg = Graphics.FromImage(bmp);
try
{
// 在位图上画文字阴影
bg.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
bg.DrawString(text, font, brush, sr, format);
// 制造阴影模糊
MaskShadow(bmp);
// 按文字阴影角度、半径和距离输出文字阴影到给定的画布
RectangleF dr = layoutRect;
dr.Offset((float)(Math.Cos(Math.PI * angle / 180.0) * distance),
(float)(Math.Sin(Math.PI * angle / 180.0) * distance));
sr.Inflate((float)radius, (float)radius);
dr.Inflate((float)radius, (float)radius);
g.DrawImage(bmp, dr, sr, GraphicsUnit.Pixel);
}
finally { }
}
/// <summary>
/// 画文字阴影
/// </summary>
/// <param name="g">画布</param>
/// <param name="text">文字串</param>
/// <param name="font">字体</param>
/// <param name="layoutRect">文字串的布局矩形</param>
public void Draw(Graphics g, string text, Font font, RectangleF layoutRect)
{
Draw(g, text, font, layoutRect, null);
}
/// <summary>
/// 画文字阴影
/// </summary>
/// <param name="g">画布</param>
/// <param name="text">文字串</param>
/// <param name="font">字体</param>
/// <param name="origin">文字串的输出原点</param>
/// <param name="format">文字串输出格式</param>
public void Draw(Graphics g, string text, Font font, PointF origin, StringFormat format)
{
RectangleF rect = new RectangleF(origin, g.MeasureString(text, font, origin, format));
Draw(g, text, font, rect, format);
}
/// <summary>
/// 画文字阴影
/// </summary>
/// <param name="g">画布</param>
/// <param name="text">文字串</param>
/// <param name="font">字体</param>
/// <param name="origin">文字串的输出原点</param>
public void Draw(Graphics g, string text, Font font, PointF origin)
{
Draw(g, text, font, origin, null);
}
}
没弄过
这个可以画出阴影
拦截消息应该拦截哪些 怎么弄 求解 
熙风 2013-12-25
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