標籤光滑圓角

Question

兩個標籤具有AutoSize真正& TextAlign MiddleCenter。

label2如何顯示平滑的邊界？

這裏是處理器Form.Load(...) & Form.Paint(...)測試代碼：

int _cornerRadius = 10; 
Point _locationLabel2; 

// Form.Load(...) 
private void Form3_Load(object sender, EventArgs e) 
{ 
    // Step 1: Cut the label regions (seems to be ok, result is the same for both labels) 
    GraphicsPath graphicsPath = _getRoundPath(label1.ClientRectangle, _cornerRadius); 
    label1.Region = new Region(graphicsPath); 
    graphicsPath = _getRoundPath(label2.ClientRectangle, _cornerRadius); 
    label2.Region = new Region(graphicsPath); 

    _locationLabel2 = this.PointToClient(label2.Parent.PointToScreen(label2.Location)); 
} 

// Form.Paint(...) 
private void Form3_Paint(object sender, PaintEventArgs e) 
{ 
    using (Pen pen = new Pen(label1.BackColor, 3.0f)) 
    { 
     // Step 2: Smooth the label borders (ok only for label1) 
     _drawRoundedRectangle(e.Graphics, pen, label1.Location.X, label1.Location.Y, 
           label1.ClientRectangle.Width, label1.ClientRectangle.Height, _cornerRadius); 
     _drawRoundedRectangle(e.Graphics, pen, _locationLabel2.X, _locationLabel2.Y, 
           label2.ClientRectangle.Width, label2.ClientRectangle.Height, _cornerRadius); 
    } 
} 

// Helper 1/3 
private static GraphicsPath _getRoundPath(Rectangle rectangle, int radius) 
{ 
    int x = rectangle.X; 
    int y = rectangle.Y; 
    int width = rectangle.Width; 
    int height = rectangle.Height; 

    radius = radius << 1; 

    GraphicsPath path = new GraphicsPath(); 

    if (radius > 0) 
    { 
     if (radius > height) radius = height; 
     if (radius > width) radius = width; 
     path.AddArc(x, y, radius, radius, 180, 90); 
     path.AddArc(x + width - radius, y, radius, radius, 270, 90); 
     path.AddArc(x + width - radius, y + height - radius, radius, radius, 0, 90); 
     path.AddArc(x, y + height - radius, radius, radius, 90, 90); 
     path.CloseFigure(); 
    } 
    else 
    { 
     path.AddRectangle(rectangle); 
    } 

    return path; 
} 

// Helper 2/3 
private void _drawRoundedRectangle(Graphics graphics, Pen pen, int x, int y, int width, int height, int radius) 
{ 
    RectangleF rectangle = new RectangleF(x, y, width, height); 
    GraphicsPath path = _generateRoundedRectangle(graphics, rectangle, radius); 
    SmoothingMode old = graphics.SmoothingMode; 
    graphics.SmoothingMode = SmoothingMode.AntiAlias; 
    graphics.DrawPath(pen, path); 
    graphics.SmoothingMode = old; 
} 

// Helper 3/3 
private static GraphicsPath _generateRoundedRectangle(Graphics graphics, RectangleF rectangle, int radius) 
{ 
    GraphicsPath path = new GraphicsPath(); 
    float diameter = radius * 2.0F; 
    SizeF sizeF = new SizeF(diameter, diameter); 
    RectangleF arc = new RectangleF(rectangle.Location, sizeF); 

    path.AddArc(arc, 180, 90); 
    arc.X = rectangle.Right - diameter; 
    path.AddArc(arc, 270, 90); 
    arc.Y = rectangle.Bottom - diameter; 
    path.AddArc(arc, 0, 90); 
    arc.X = rectangle.Left; 
    path.AddArc(arc, 90, 90); 
    path.CloseFigure(); 

    return path; 
} 

_{主代碼部分是從Arun Reginald Zaheeruddin}

Answer 1

本answer由@Reza Aghaei解決它。

解決方案

using System.ComponentModel; 
using System.Drawing; 
using System.Drawing.Drawing2D; 
using System.Windows.Forms; 
public class RoundLabel : Label 
{ 
    [Browsable(true)] 
    public Color _BackColor { get; set; } 

    public RoundLabel() 
    { 
     this.DoubleBuffered = true; 
    } 

    protected override void OnPaint(PaintEventArgs e) 
    { 
     base.OnPaint(e); 
     using (var graphicsPath = _getRoundRectangle(this.ClientRectangle)) 
     { 
      e.Graphics.SmoothingMode = SmoothingMode.AntiAlias; 
      using (var brush = new SolidBrush(_BackColor)) 
       e.Graphics.FillPath(brush, graphicsPath); 
      using (var pen = new Pen(_BackColor, 1.0f)) 
       e.Graphics.DrawPath(pen, graphicsPath); 
      TextRenderer.DrawText(e.Graphics, Text, this.Font, this.ClientRectangle, this.ForeColor); 
     } 
    } 

    private GraphicsPath _getRoundRectangle(Rectangle rectangle) 
    { 
     int cornerRadius = 15; // change this value according to your needs 
     int diminisher = 1; 
     GraphicsPath path = new GraphicsPath(); 
     path.AddArc(rectangle.X, rectangle.Y, cornerRadius, cornerRadius, 180, 90); 
     path.AddArc(rectangle.X + rectangle.Width - cornerRadius - diminisher, rectangle.Y, cornerRadius, cornerRadius, 270, 90); 
     path.AddArc(rectangle.X + rectangle.Width - cornerRadius - diminisher, rectangle.Y + rectangle.Height - cornerRadius - diminisher, cornerRadius, cornerRadius, 0, 90); 
     path.AddArc(rectangle.X, rectangle.Y + rectangle.Height - cornerRadius - diminisher, cornerRadius, cornerRadius, 90, 90); 
     path.CloseAllFigures(); 
     return path; 
    } 
}