using System.Drawing;
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using System.Drawing.Imaging;
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namespace Microsoft.Windows.Forms
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{
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public static partial class RenderEngine
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{
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/// <summary>
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/// 获取黑白图像(返回了新的图像,使用完后需要手动释放)
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/// </summary>
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/// <param name="originImage">原图</param>
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/// <returns>黑白图</returns>
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public static Bitmap GetGrayImage(Image originImage)
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{
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int width = originImage.Width;
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int height = originImage.Height;
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Bitmap newBitmap = new Bitmap(width, height);
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//绘制新图像
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using (Graphics g = Graphics.FromImage(newBitmap))
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{
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//绘图参数检查
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if (m_DisabledImageAttr == null)
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{
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//颜色变换矩阵,第一行到第五行分别表示RGBA虚拟,第一列到第五列分别表示RGBA虚拟.
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ColorMatrix colorMatrix = new ColorMatrix(new float[][]
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{
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new float[] {0.2125f, 0.2125f, 0.2125f, 000f, 000f},//新的R=旧的R*0.2125f+旧的G*0.2125f+旧的B*0.2125f
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new float[] {0.2577f, 0.2577f, 0.2577f, 000f, 000f},
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new float[] {0.0361f, 0.0361f, 0.0361f, 000f, 000f},
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new float[] {000000f, 000000f, 000000f, 001f, 000f},
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new float[] {0.3800f, 0.3800f, 0.3800f, 000f, 001f}
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});
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//创建绘图参数
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m_DisabledImageAttr = new ImageAttributes();
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m_DisabledImageAttr.SetColorMatrix(colorMatrix);
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}
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//绘图
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g.DrawImage(originImage, new Rectangle(0, 0, width, height), 0, 0, width, height, GraphicsUnit.Pixel, m_DisabledImageAttr);
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}
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//返回
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return newBitmap;
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}
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/// <summary>
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/// 获取透明图像(返回了新的图像,使用完后需要手动释放)
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/// </summary>
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/// <param name="originImage">原图</param>
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/// <param name="opacity">透明度[0-1]</param>
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/// <returns>透明图像</returns>
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public static Bitmap GetTransparentImage(Image originImage, float opacity)
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{
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int width = originImage.Width;
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int height = originImage.Height;
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Bitmap newBitmap = new Bitmap(width, height);
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//绘制新图像
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using (Graphics graphics = Graphics.FromImage(newBitmap))
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{
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//绘图参数
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using (ImageAttributes imgAttr = new ImageAttributes())
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{
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ColorMatrix clrMatrix = new ColorMatrix();
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clrMatrix.Matrix33 = opacity;
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imgAttr.SetColorMatrix(clrMatrix);
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//绘图
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graphics.DrawImage(originImage, new Rectangle(0, 0, width, height), 0, 0, width, height, GraphicsUnit.Pixel, imgAttr);
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}
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}
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//返回
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return newBitmap;
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}
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/// <summary>
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/// 缩放图像(返回了新的图像,使用完后需要手动释放)
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/// </summary>
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/// <param name="originImage">要缩放的图像</param>
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/// <param name="size">要缩放为的大小</param>
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/// <returns>缩放后的图像</returns>
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public static Bitmap GetStretchImage(Image originImage, Size size)
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{
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if (originImage == null || size.Width <= 0 || size.Height <= 0)
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return null;
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Bitmap newBitmap = new Bitmap(size.Width, size.Height);
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using (Graphics g = Graphics.FromImage(newBitmap))
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{
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g.DrawImage(originImage, new Rectangle(0, 0, size.Width, size.Height));
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}
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return newBitmap;
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}
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}
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}
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