【图片渐变】实现类似QQ背景的渐变透明图片

使用方式

[C#] 纯文本查看 复制代码

Bitmap _Bitmap = (Bitmap)Image.FromFile(@"c:/1.jpg");
pictureBox3.Image = _Bitmap;
Bitmap _NewBitmap1 = Zgke.MyImage.Panit.Impression.BothAlpha(_Bitmap, false, false);
pictureBox1.SizeMode = PictureBoxSizeMode.AutoSize;
pictureBox1.Image = _NewBitmap1;
Bitmap _NewBitmap2 = Zgke.MyImage.Panit.Impression.BothAlpha(_Bitmap, false, true);
pictureBox2.SizeMode = PictureBoxSizeMode.AutoSize;
pictureBox2.Image = _NewBitmap2;

效果图



下面是全部代码

[C#] 纯文本查看 复制代码

/// <summary>
/// 设置图形边缘半透明
/// </summary>
/// <param name="p_Bitmap">图形</param>
/// <param name="p_CentralTransparent">true中心透明 false边缘透明</param>
/// <param name="p_Crossdirection">true横 false纵</param>
/// <returns></returns>
public static Bitmap BothAlpha(Bitmap p_Bitmap, bool p_CentralTransparent, bool p_Crossdirection) {
    Bitmap _SetBitmap = new Bitmap(p_Bitmap.Width, p_Bitmap.Height);
    Graphics _GraphisSetBitmap = Graphics.FromImage(_SetBitmap);
    _GraphisSetBitmap.DrawImage(p_Bitmap, new Rectangle(0, 0, p_Bitmap.Width, p_Bitmap.Height));
    _GraphisSetBitmap.Dispose();

    Bitmap _Bitmap = new Bitmap(_SetBitmap.Width, _SetBitmap.Height);
    Graphics _Graphcis = Graphics.FromImage(_Bitmap);

    Point _Left1 = new Point(0, 0);
    Point _Left2 = new Point(_Bitmap.Width, 0);
    Point _Left3 = new Point(_Bitmap.Width, _Bitmap.Height / 2);
    Point _Left4 = new Point(0, _Bitmap.Height / 2);

    if (p_Crossdirection) {
        _Left1 = new Point(0, 0);
        _Left2 = new Point(_Bitmap.Width / 2, 0);
        _Left3 = new Point(_Bitmap.Width / 2, _Bitmap.Height);
        _Left4 = new Point(0, _Bitmap.Height);
    }

    Point[] _Point = new Point[] { _Left1, _Left2, _Left3, _Left4 };
    PathGradientBrush _SetBruhs = new PathGradientBrush(_Point, WrapMode.TileFlipY);

    _SetBruhs.CenterPoint = new PointF(0, 0);
    _SetBruhs.FocusScales = new PointF(_Bitmap.Width / 2, 0);
    _SetBruhs.CenterColor = Color.FromArgb(0, 255, 255, 255);
    _SetBruhs.SurroundColors = new Color[] { Color.FromArgb(255, 255, 255, 255) };
    if (p_Crossdirection) {
        _SetBruhs.FocusScales = new PointF(0, _Bitmap.Height);
        _SetBruhs.WrapMode = WrapMode.TileFlipX;
    }

    if (p_CentralTransparent) {
        _SetBruhs.CenterColor = Color.FromArgb(255, 255, 255, 255);
        _SetBruhs.SurroundColors = new Color[] { Color.FromArgb(0, 255, 255, 255) };
    }

    _Graphcis.FillRectangle(_SetBruhs, new Rectangle(0, 0, _Bitmap.Width, _Bitmap.Height));
    _Graphcis.Dispose();

    BitmapData _NewData = _Bitmap.LockBits(new Rectangle(0, 0, _Bitmap.Width, _Bitmap.Height), ImageLockMode.ReadOnly, _Bitmap.PixelFormat);
    byte[] _NewBytes = new byte[_NewData.Stride * _NewData.Height];
    Marshal.Copy(_NewData.Scan0, _NewBytes, 0, _NewBytes.Length);
    _Bitmap.UnlockBits(_NewData);

    BitmapData _SetData = _SetBitmap.LockBits(new Rectangle(0, 0, _SetBitmap.Width, _SetBitmap.Height), ImageLockMode.ReadWrite, _SetBitmap.PixelFormat);
    byte[] _SetBytes = new byte[_SetData.Stride * _SetData.Height];
    Marshal.Copy(_SetData.Scan0, _SetBytes, 0, _SetBytes.Length);
    int _WriteIndex = 0;
    for (int i = 0; i != _SetData.Height; i++) {
        _WriteIndex = i * _SetData.Stride + 3;
        for (int z = 0; z != _SetData.Width; z++) {
            _SetBytes[_WriteIndex] = _NewBytes[_WriteIndex];
            _WriteIndex += 4;
        }
    }
    Marshal.Copy(_SetBytes, 0, _SetData.Scan0, _SetBytes.Length);
    _SetBitmap.UnlockBits(_SetData);
    return _SetBitmap;
}

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把主色调函数发出来吧，乖奴隶

xiaobo 发表于 2014-7-30 09:41
把主色调函数发出来吧，乖奴隶

= =你怎么知道我类库有这个方法。。

乔克斯 发表于 2014-7-30 11:26
= =你怎么知道我类库有这个方法。。

因为我跟进去过...

我在回帖赚积分！！

bug 发表于 2014-8-2 11:04
我在回帖赚积分！！

哈哈 真好 谢谢 老乔

真好 谢谢 老乔 !!!

我在回帖赚积分！！

秀啊狗子