WInForm修改button形状为带圆角时，只有左上角是圆角

Question

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Drawing.Drawing2D ;namespace WindowsFormsApplication6.button._03
{    public partial class Form1 : Form
    {
      
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
        }
        private void Form1_Load(object sender, EventArgs e)
        {
        }
        protected override void OnPaint(PaintEventArgs pe)
        {    
            GraphicsPath path = new GraphicsPath();
            Rectangle rect = new Rectangle(0, 22, this.Width, this.Height-22);  
            path = GetRoundedRectPath(rect, 20);
            Region reg = new Region(path);
            this.button1.Region = reg;
            base.OnPaint(pe);
         }
        private GraphicsPath GetRoundedRectPath(Rectangle rect, int radius)
        {
            int diameter = radius;
            Rectangle arcRect = new Rectangle(rect.Location, new Size(diameter, diameter));
            GraphicsPath path = new GraphicsPath();
            // 左上角  
            path.AddArc(arcRect, 180, 90);
            // 右上角  
            arcRect.X = rect.Right - diameter;
            path.AddArc(arcRect, 270, 90);
            // 右下角  
            arcRect.Y = rect.Bottom - 0;
            path.AddArc(arcRect, 0, 90);
            // 左下角  
            arcRect.X = rect.Left;
            path.AddArc(arcRect, 90, 90);
            path.CloseFigure();
            return path;
        }
        private void SetWindowRegion(object sender, EventArgs e)
        {
        }
        private void OnPaint(object sender, EventArgs e)
        {
        }  
    }
    
}

Answer 1

很明显设置  this.button1.Region   这个不对。

Answer 2

每次画圆角的时候都用Rectangle arcRect么？  位置不改变么？

Answer 3

看错了。这个怎么删除呀！！是工作区域设置不对，你画的时候 rect长宽-1试试？还有 设置工作区域为线条 这样怎么点击呀。你可以填充起来！

Answer 4

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace Gid_1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void Draw(Rectangle rectangle, Graphics g, int _radius, bool cusp, Color begin_color, Color end_color)
        {
            int span = 2;
            //抗锯齿
            g.SmoothingMode = SmoothingMode.AntiAlias;
            //渐变填充
            LinearGradientBrush myLinearGradientBrush = new LinearGradientBrush(rectangle, begin_color, end_color, LinearGradientMode.Vertical);
            //画尖角
            if (cusp)
            {
                span = 10;
                PointF p1 = new PointF(rectangle.Width - 12, rectangle.Y + 10);
                PointF p2 = new PointF(rectangle.Width - 12, rectangle.Y + 30);
                PointF p3 = new PointF(rectangle.Width, rectangle.Y + 20);
                PointF[] ptsArray = { p1, p2, p3 };
                g.FillPolygon(myLinearGradientBrush, ptsArray);
            }
            //填充
            g.FillPath(myLinearGradientBrush, DrawRoundRect(rectangle.X, rectangle.Y, rectangle.Width - span, rectangle.Height-1, _radius));
        }
        public static GraphicsPath DrawRoundRect(int x, int y, int width, int height, int radius)
        {
            //四边圆角
            GraphicsPath gp = new GraphicsPath();
            gp.AddArc(x, y, radius, radius, 180, 90);
            gp.AddArc(width - radius, y, radius, radius, 270, 90);
            gp.AddArc(width - radius, height - radius, radius, radius, 0, 90);
            gp.AddArc(x, height - radius, radius, radius, 90, 90);
            gp.CloseAllFigures();
            return gp;
        }        private void panel1_Paint(object sender, PaintEventArgs e)
        {
            Draw(e.ClipRectangle, e.Graphics, 18,true, Color.FromArgb(90, 143, 0), Color.FromArgb(41, 67, 0));
            base.OnPaint(e);
            Graphics g = e.Graphics;
            g.DrawString("其实我是个Panel", new Font("微软雅黑", 9, FontStyle.Regular), new SolidBrush(Color.White), new PointF(10, 10));
        }        private void panel2_Paint(object sender, PaintEventArgs e)
        {
            Draw(e.ClipRectangle, e.Graphics, 18, false, Color.FromArgb(113, 113, 113), Color.FromArgb(0, 0, 0));
            base.OnPaint(e);
            Graphics g = e.Graphics;
            g.DrawString("其实我是个Panel", new Font("微软雅黑", 9, FontStyle.Regular), new SolidBrush(Color.White), new PointF(10, 10));
        }        private void button1_Paint(object sender, PaintEventArgs e)
        {
            Draw(e.ClipRectangle, e.Graphics, 18, false, Color.FromArgb(0, 122, 204), Color.FromArgb(8, 39, 57));
            base.OnPaint(e);
            Graphics g = e.Graphics;
            g.DrawString("其实我是个按钮", new Font("微软雅黑", 9, FontStyle.Regular), new SolidBrush(Color.White), new PointF(10, 10));
        }        private void label1_Paint(object sender, PaintEventArgs e)
        {
            Draw(e.ClipRectangle, e.Graphics, 18, false, Color.FromArgb(210, 210, 210), Color.FromArgb(242, 242, 242));
            base.OnPaint(e);            Graphics g = e.Graphics;
            g.DrawString("其实我是Label", new Font("微软雅黑", 9, FontStyle.Regular), new SolidBrush(Color.Black), new PointF(10, 10));
        }
    }
}
圆角按钮要设置否则4个角还有颜色。

Answer 5

这样的button怎么设置点击后背景颜色

Answer 6

自绘一个Button不是省事很多

Answer 7

确实，这样一堆代码，还容易出错，要么你直接用WPF写一个ControlTemplate，直接搞定，做WinForm的，GDI+需要掌握其中的技巧，这项目需要改变外观的，太适合用WPF去做了WinForm毕竟，不适合做过多的外观修改！！！WPF是做C/S的WinForm下的一个完整补充