Windows窗体具有方便的ControlPaint.DrawImageDisabled,可以在灰显的禁用状态下绘制彩色图像。对于给定的颜色,有没有办法确定禁用的颜色(就好像它是由DrawImageDisabled绘制的)?
答案 0 :(得分:3)
Reflector告诉我们,这是创建使用的ColorMatrix的代码:
// In class-level declarations in ColorPaint
private static ImageAttributes disabledImageAttr;
// In the actual implementation method for DrawImageDisabled
if (disabledImageAttr == null)
{
float[][] newColorMatrix = new float[5][];
newColorMatrix[0] = new float[] { 0.2125f, 0.2125f, 0.2125f, 0f, 0f };
newColorMatrix[1] = new float[] { 0.2577f, 0.2577f, 0.2577f, 0f, 0f };
newColorMatrix[2] = new float[] { 0.0361f, 0.0361f, 0.0361f, 0f, 0f };
float[] numArray2 = new float[5];
numArray2[3] = 1f;
newColorMatrix[3] = numArray2;
newColorMatrix[4] = new float[] { 0.38f, 0.38f, 0.38f, 0f, 1f };
ColorMatrix matrix = new ColorMatrix(newColorMatrix);
disabledImageAttr = new ImageAttributes();
disabledImageAttr.ClearColorKey();
disabledImageAttr.SetColorMatrix(matrix);
}
// To draw the image itself
using (Bitmap bitmap = new Bitmap(image.Width, image.Height))
{
using (Graphics graphics2 = Graphics.FromImage(bitmap))
{
graphics2.DrawImage(image, new Rectangle(0, 0, size.Width, size.Height), 0, 0, size.Width, size.Height, GraphicsUnit.Pixel, disabledImageAttr);
}
graphics.DrawImageUnscaled(bitmap, imageBounds);
return;
}