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public class OpaqueLabel : Label
{
public OpaqueLabel()
{
this.BackColor = Color.Red;
this.Font = new Font("宋体", 18f, FontStyle.Bold);
}
[DefaultValue(typeof(Color), "Red")]
public override Color BackColor
{
get
{
return base.BackColor;
}
set
{
base.BackColor = value;
}
}
[DefaultValue(typeof(Font), "宋体, 18pt, style=Bold")]
public override Font Font
{
get
{
return base.Font;
}
set
{
base.Font = value;
}
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
GraphicsPath path = new GraphicsPath();
path.AddString(Text, Font.FontFamily, (int)Font.Style, Font.Size * 1.2f, this.ClientRectangle, StringFormat.GenericDefault);
this.Region = new Region(path);
path.Dispose();
}
}
private void button1_Click(object sender, EventArgs e)
{
Point pt = pictureBox1.Parent.PointToScreen(pictureBox1.Location);
pt.Offset(30, 10);
Rectangle bounds = new Rectangle(pt, new Size(300, 50));
Font font = new Font("宋体", 18f);
DrawString("Hello, world!", bounds, font, Color.Red);
font.Dispose();
}
[DllImport("user32.dll")]
private static extern IntPtr GetDC(IntPtr hWnd);
[DllImport("user32.dll")]
private static extern IntPtr ReleaseDC(IntPtr hDC);
public void DrawString(string text, Rectangle bounds, Font font, Color color)
{
IntPtr dc = GetDC(IntPtr.Zero);
Graphics g = Graphics.FromHdc(dc);
SolidBrush br = new SolidBrush(color);
//TextRenderer.DrawText(g, text, font, bounds, color);
g.DrawString(text, font, br, bounds);
br.Dispose();
ReleaseDC(dc);
}
label1.Parent = pictureBox1;
label1.Location = new Point(label1.Location.X - pictureBox1.Location.X, label1.Location.Y - pictureBox1.Location.Y);
label1.BackColor = Color.Transparent;