Question

在以下代码中：

void f10(Graphics g)
{
    var img = new Bitmap(1, 1);
    img.SetPixel(0, 0, Color.Black);
    var destRect = pictureBox1.ClientRectangle;
    destRect.Inflate(-5, -5);
    g.DrawRectangle(new Pen(Color.Blue), destRect);
    var srcRect = new RectangleF(-.5f, -.5f, img.Width, img.Height);
    g.InterpolationMode = InterpolationMode.NearestNeighbor;
    g.DrawImage(img, destRect, srcRect, GraphicsUnit.Pixel);
}

private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
    f10(e.Graphics);
}

private void pictureBox1_Resize(object sender, EventArgs e)
{
    textBox1.Text = pictureBox1.ClientSize.Width + "x" + pictureBox1.ClientSize.Height;
    pictureBox1.Invalidate();
}

我得到以下结果：

Result http://www.uploadup.com/di-XJ2I.png

表单包含一个适合表单内部内容的图片框和一个显示图片框尺寸的文本框。我希望黑盒子的右侧适合整个蓝色矩形的内部。为什么不呢？！

gap http://www.uploadup.com/di-YGWL.png

通过更改尺寸值（调整图片框大小），间隙会发生变化。

我使用以下代码根据图像宽度值找到错误的偏移量：

void f11(Graphics g)
{
    var img = new Bitmap(1, 1);
    img.SetPixel(0, 0, Color.Black);
    var bmp = new Bitmap(10010, 6);
    var destRect = new Rectangle(0, 0, 3, bmp.Height);
    var bmpG = Graphics.FromImage(bmp);
    var srcRect = new RectangleF(-.5f, -.5f, img.Width, img.Height);
    bmpG.InterpolationMode = InterpolationMode.NearestNeighbor;
    g.DrawString("Please Wait...", SystemFonts.DefaultFont, Brushes.Black, 10, 10);
    for (; destRect.Width < bmp.Width; destRect.Width++)
    {
        bmpG.DrawRectangle(new Pen(Color.Blue), new Rectangle(destRect.X, destRect.Y, destRect.Width-1, destRect.Height-1));
        bmpG.DrawImage(img, new Rectangle(destRect.X+1, destRect.Y+1, destRect.Width-2, destRect.Height-2), srcRect, GraphicsUnit.Pixel);
        //g.FillRectangle(new SolidBrush(bmp.GetPixel(destRect.Width-2, 1)), pictureBox1.ClientRectangle);
        int n = 0;
        while (!bmp.GetPixel(destRect.Width - 2 - n, 1).ToArgb().Equals(Color.Black.ToArgb())) n++;
        Console.WriteLine("{0}\t{1}", destRect.Width-2, n);
    }
    g.FillRectangle(new SolidBrush(pictureBox1.BackColor), pictureBox1.ClientRectangle);
    g.DrawString("Done.", SystemFonts.DefaultFont, Brushes.Black, 10, 10);
}

private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
    f11(e.Graphics);
}

结果是：

Result

你可以帮我找到解决方法吗？感谢

Graphics.DrawImage的另一个意外结果

0 个答案: