Рисуем кнопку с округленными краями Win Forms C#

Нашёл очень удобный класс в виде контрола, который позволяет легко создавать кнопки с округлением




Вставляем этот класс в свой проект

public class RoundButton : Control
{
public Color BackColor2 { get; set; }
public Color ButtonBorderColor { get; set; }
public int ButtonRoundRadius { get; set; }

public Color ButtonHighlightColor { get; set; }
public Color ButtonHighlightColor2 { get; set; }
public Color ButtonHighlightForeColor { get; set; }

public Color ButtonPressedColor { get; set; }
public Color ButtonPressedColor2 { get; set; }
public Color ButtonPressedForeColor { get; set; }

private bool IsHighlighted;
private bool IsPressed;

public RoundButton()
{
Size = new Size(100, 40);
ButtonRoundRadius = 30;
BackColor = Color.Gainsboro;
BackColor2 = Color.Silver;
ButtonBorderColor = Color.Black;
ButtonHighlightColor = Color.Orange;
ButtonHighlightColor2 = Color.OrangeRed;
ButtonHighlightForeColor = Color.Black;

ButtonPressedColor = Color.Red;
ButtonPressedColor2 = Color.Maroon;
ButtonPressedForeColor = Color.White;
}

protected override CreateParams CreateParams
{
get
{
CreateParams createParams = base.CreateParams;
createParams.ExStyle |= 0x00000020; // WS_EX_TRANSPARENT
return createParams;
}
}

protected override void OnPaint(PaintEventArgs e)
{
e.Graphics.SmoothingMode = SmoothingMode.HighQuality;

var foreColor = IsPressed ? ButtonPressedForeColor : IsHighlighted ? ButtonHighlightForeColor : ForeColor;
var backColor = IsPressed ? ButtonPressedColor : IsHighlighted ? ButtonHighlightColor : BackColor;
var backColor2 = IsPressed ? ButtonPressedColor2 : IsHighlighted ? ButtonHighlightColor2 : BackColor2;


using (var pen = new Pen(ButtonBorderColor, 1))
e.Graphics.DrawPath(pen, Path);

using (var brush = new LinearGradientBrush(ClientRectangle, backColor, backColor2, LinearGradientMode.Vertical))
e.Graphics.FillPath(brush, Path);

using (var brush = new SolidBrush(foreColor))
{
var sf = new StringFormat { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center };
var rect = ClientRectangle;
rect.Inflate(-4, -4);
e.Graphics.DrawString(Text, Font, brush, rect, sf);
}

base.OnPaint(e);
}

protected override void OnPaintBackground(PaintEventArgs e)
{
}

protected override void OnMouseEnter(EventArgs e)
{
base.OnMouseEnter(e);
IsHighlighted = true;
Parent.Invalidate(Bounds, false);
Invalidate();
}

protected override void OnMouseLeave(EventArgs e)
{
base.OnMouseLeave(e);
IsHighlighted = false;
IsPressed = false;
Parent.Invalidate(Bounds, false);
Invalidate();
}

protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
Parent.Invalidate(Bounds, false);
Invalidate();
IsPressed = true;
}

protected override void OnMouseUp(MouseEventArgs e)
{
base.OnMouseUp(e);
Parent.Invalidate(Bounds, false);
Invalidate();
IsPressed = false;
}

protected GraphicsPath Path
{
get
{
var rect = ClientRectangle;
rect.Inflate(-5, -5);
return GetRoundedRectangle(rect, ButtonRoundRadius);
}
}

public static GraphicsPath GetRoundedRectangle(Rectangle rect, int d)
{
var gp = new GraphicsPath();

gp.AddArc(rect.X, rect.Y, d, d, 180, 90);
gp.AddArc(rect.X + rect.Width - d, rect.Y, d, d, 270, 90);
gp.AddArc(rect.X + rect.Width - d, rect.Y + rect.Height - d, d, d, 0, 90);
gp.AddArc(rect.X, rect.Y + rect.Height - d, d, d, 90, 90);
gp.CloseFigure();

return gp;
}
}

CSHARP

public class RoundButton : Control

    {

        public Color BackColor2 { get; set; }

        public Color ButtonBorderColor { get; set; }

        public int ButtonRoundRadius { get; set; }



        public Color ButtonHighlightColor { get; set; }

        public Color ButtonHighlightColor2 { get; set; }

        public Color ButtonHighlightForeColor { get; set; }



        public Color ButtonPressedColor { get; set; }

        public Color ButtonPressedColor2 { get; set; }

        public Color ButtonPressedForeColor { get; set; }



        private bool IsHighlighted;

        private bool IsPressed;



        public RoundButton()

        {

            Size = new Size(100, 40);

            ButtonRoundRadius = 30;

            BackColor = Color.Gainsboro;

            BackColor2 = Color.Silver;

            ButtonBorderColor = Color.Black;

            ButtonHighlightColor = Color.Orange;

            ButtonHighlightColor2 = Color.OrangeRed;

            ButtonHighlightForeColor = Color.Black;



            ButtonPressedColor = Color.Red;

            ButtonPressedColor2 = Color.Maroon;

            ButtonPressedForeColor = Color.White;

        }



        protected override CreateParams CreateParams

        {

            get

            {

                CreateParams createParams = base.CreateParams;

                createParams.ExStyle |= 0x00000020; // WS_EX_TRANSPARENT

                return createParams;

            }

        }



        protected override void OnPaint(PaintEventArgs e)

        {

            e.Graphics.SmoothingMode = SmoothingMode.HighQuality;



            var foreColor = IsPressed ? ButtonPressedForeColor : IsHighlighted ? ButtonHighlightForeColor : ForeColor;

            var backColor = IsPressed ? ButtonPressedColor : IsHighlighted ? ButtonHighlightColor : BackColor;

            var backColor2 = IsPressed ? ButtonPressedColor2 : IsHighlighted ? ButtonHighlightColor2 : BackColor2;





            using (var pen = new Pen(ButtonBorderColor, 1))

                e.Graphics.DrawPath(pen, Path);



            using (var brush = new LinearGradientBrush(ClientRectangle, backColor, backColor2, LinearGradientMode.Vertical))

                e.Graphics.FillPath(brush, Path);



            using (var brush = new SolidBrush(foreColor))

            {

                var sf = new StringFormat { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center };

                var rect = ClientRectangle;

                rect.Inflate(-4, -4);

                e.Graphics.DrawString(Text, Font, brush, rect, sf);

            }



            base.OnPaint(e);

        }



        protected override void OnPaintBackground(PaintEventArgs e)

        {

        }



        protected override void OnMouseEnter(EventArgs e)

        {

            base.OnMouseEnter(e);

            IsHighlighted = true;

            Parent.Invalidate(Bounds, false);

            Invalidate();

        }



        protected override void OnMouseLeave(EventArgs e)

        {

            base.OnMouseLeave(e);

            IsHighlighted = false;

            IsPressed = false;

            Parent.Invalidate(Bounds, false);

            Invalidate();

        }



        protected override void OnMouseDown(MouseEventArgs e)

        {

            base.OnMouseDown(e);

            Parent.Invalidate(Bounds, false);

            Invalidate();

            IsPressed = true;

        }



        protected override void OnMouseUp(MouseEventArgs e)

        {

            base.OnMouseUp(e);

            Parent.Invalidate(Bounds, false);

            Invalidate();

            IsPressed = false;

        }



        protected GraphicsPath Path

        {

            get

            {

                var rect = ClientRectangle;

                rect.Inflate(-5, -5);

                return GetRoundedRectangle(rect, ButtonRoundRadius);

            }

        }



        public static GraphicsPath GetRoundedRectangle(Rectangle rect, int d)

        {

            var gp = new GraphicsPath();



            gp.AddArc(rect.X, rect.Y, d, d, 180, 90);

            gp.AddArc(rect.X + rect.Width - d, rect.Y, d, d, 270, 90);

            gp.AddArc(rect.X + rect.Width - d, rect.Y + rect.Height - d, d, d, 0, 90);

            gp.AddArc(rect.X, rect.Y + rect.Height - d, d, d, 90, 90);

            gp.CloseFigure();



            return gp;

        }

    }

Далее нажимаем "Сборка -- Собрать решение"


Появится контрол RoundButton в панели инструментов



Перетаскиваем его и используем на здоровье!

BackColor и BackColor2 - цвета фона кнопки, если поставить разные значения, то получится фон в виде градиента
ButtonRoundRadius - радиус округления кнопки, на скриншоте кнопка с радиусом 15.