winform- 实现画圆角矩形

使用winform实现画圆角矩形

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        private int intStartX = 0;
        private int intStartY = 0;
        private bool isMouseDraw = false;
        private Rectangle rectangle;

        public Form1()
        {
            InitializeComponent();
        }


        private int[] colorR = { 255, 250, 245, 240, 235, 230, 225, 220, 215, 210, 206, 201, 196, 192, 187, 183, 179, 174, 170, 166, 162, 157, 153, 149, 145, 141, 137, 134, 130, 126, 122, 119, 115, 112, 108, 105, 101, 98, 95, 92, 88, 85, 82, 79, 76, 73, 71, 68, 65, 62, 60, 57, 54, 52, 49, 47, 45, 42, 40, 38, 36, 34, 34, 34, 33, 33, 33, 33, 33, 33, 33, 33, 32, 32, 32, 32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 29, 28, 28, 20, 20, 21, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 32, 35, 38, 41, 44, 48, 51, 54, 57, 60, 64, 67, 70, 74, 77, 81, 84, 88, 91, 95, 98, 102, 105, 109, 113, 116, 120, 124, 128, 131, 135, 139, 143, 147, 150, 154, 158, 162, 166, 170, 174, 178, 182, 186, 190, 194, 198, 203, 207, 211, 215, 219, 223, 228, 230, 231, 232, 232, 232, 231, 231, 230, 230, 229, 229, 228, 228, 227, 227, 227, 226, 226, 225, 225, 224, 224, 223, 223, 222, 222, 221, 221, 221, 220, 220, 219, 219, 218, 218, 217, 217, 216, 216, 216, 215, 215, 214, 214, 213, 213, 212, 212, 211, 211, 210, 210, 210, 209, 209, 211, 213, 214, 216, 218, 220, 221, 223, 225, 226, 228, 230, 232, 233, 235, 237, 239, 240, 242, 244, 246, 247, 249, 0 };
        private int[] colorG = { 255, 250, 245, 240, 235, 230, 226, 221, 216, 212, 208, 203, 199, 195, 191, 187, 183, 179, 175, 172, 168, 165, 161, 158, 155, 151, 148, 145, 142, 139, 136, 133, 130, 128, 125, 122, 120, 117, 115, 112, 110, 107, 105, 103, 101, 99, 97, 95, 93, 91, 89, 87, 85, 83, 81, 80, 78, 76, 75, 73, 72, 70, 73, 76, 79, 82, 85, 87, 90, 93, 96, 100, 103, 106, 109, 112, 115, 119, 122, 125, 128, 132, 133, 133, 133, 134, 134, 134, 135, 135, 136, 136, 136, 137, 137, 137, 138, 138, 138, 139, 139, 140, 140, 140, 141, 143, 144, 145, 146, 147, 149, 150, 151, 152, 154, 155, 156, 157, 158, 160, 161, 162, 163, 164, 166, 167, 168, 169, 170, 172, 173, 174, 175, 176, 178, 179, 180, 181, 183, 184, 185, 186, 187, 189, 190, 191, 192, 193, 195, 196, 197, 198, 199, 201, 202, 203, 204, 205, 207, 208, 209, 210, 212, 213, 214, 215, 216, 218, 219, 220, 221, 222, 224, 225, 226, 227, 228, 227, 226, 224, 224, 220, 217, 213, 210, 206, 203, 199, 196, 192, 189, 185, 182, 178, 175, 171, 168, 164, 161, 157, 154, 151, 147, 144, 140, 137, 133, 130, 127, 123, 120, 116, 113, 110, 106, 103, 99, 96, 93, 89, 86, 83, 79, 76, 73, 69, 66, 63, 59, 56, 53, 32, 31, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 10, 9, 0 };
        private int[] colorB = { 255, 253, 251, 249, 246, 244, 242, 240, 238, 236, 234, 232, 229, 227, 225, 223, 221, 219, 217, 214, 212, 210, 208, 206, 204, 202, 200, 197, 195, 193, 191, 189, 187, 185, 183, 180, 178, 176, 174, 172, 170, 168, 165, 163, 161, 159, 157, 155, 153, 151, 148, 146, 144, 142, 140, 138, 136, 133, 131, 129, 127, 125, 125, 126, 126, 126, 127, 127, 128, 128, 128, 129, 129, 129, 130, 130, 130, 131, 131, 132, 132, 132, 130, 127, 125, 122, 119, 116, 114, 111, 108, 105, 102, 99, 96, 93, 90, 87, 84, 80, 77, 74, 71, 62, 60, 59, 57, 56, 54, 52, 51, 49, 47, 46, 44, 42, 40, 38, 37, 35, 33, 31, 29, 30, 30, 31, 31, 32, 32, 33, 33, 34, 35, 35, 36, 36, 37, 38, 38, 39, 39, 40, 41, 41, 42, 43, 43, 44, 45, 45, 46, 47, 47, 48, 49, 49, 50, 51, 51, 52, 53, 54, 54, 55, 56, 56, 57, 58, 59, 59, 60, 61, 62, 63, 63, 64, 65, 66, 66, 67, 67, 67, 67, 66, 66, 65, 65, 65, 64, 64, 64, 63, 63, 63, 62, 62, 62, 61, 61, 61, 60, 60, 59, 59, 59, 58, 58, 58, 57, 57, 57, 56, 56, 56, 55, 55, 55, 54, 54, 54, 53, 53, 53, 52, 52, 52, 51, 51, 51, 51, 50, 29, 28, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 13, 12, 11, 10, 9, 8, 6, 5, 0 };


        private void button1_Click(object sender, EventArgs e)
        {
            Bitmap bitmap = new Bitmap(100, 256);
            Graphics g = Graphics.FromImage(bitmap);

            for (int i = 0; i < 256; i++)
            {
                Pen pen = new Pen(Color.FromArgb(colorR[i], colorG[i], colorB[i]));
                Point p1 = new Point(0, i);
                Point p2 = new Point(100, i);
                g.DrawLine(pen, p1, p2);
            }
            pictureBox1.BackColor = Color.Black;
            pictureBox1.BackgroundImageLayout = ImageLayout.Stretch;
            pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
            pictureBox1.Image = bitmap;
            g.Dispose();

        }

        private void button2_Click(object sender, EventArgs e)
        {
            Random rd = new Random();
            UInt16[] wave = new UInt16[512];
            for (int i = 0; i < wave.Length; i++)
            {
                wave[i] = (UInt16)rd.Next(1, 400);
            }

            string str = "";
            foreach (var item in wave)
            {
                str = str + item.ToString() + ",";
            }
            Console.WriteLine(str);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            //Bitmap bitmap = new Bitmap(300, 300);
            //Graphics g = Graphics.FromImage(bitmap);
            //g.SmoothingMode = SmoothingMode.HighQuality;//去掉锯齿
            //g.CompositingQuality = CompositingQuality.HighQuality;//合成图像的质量
            //g.TextRenderingHint = TextRenderingHint.SingleBitPerPixelGridFit;//去掉文字的锯齿
            //System.Drawing.Pen p = new System.Drawing.Pen(Color.FromArgb(255, 146, 126, 102), 2);

            //drawRoundedRect(g, p, 1, 1, 100, 100, 20);


            //pictureBox1.Image = bitmap;

            Bitmap bitmap = new Bitmap(100, 100);
            Graphics g = Graphics.FromImage(bitmap);
            g.SmoothingMode = SmoothingMode.HighQuality;
            Rectangle rectangle = new Rectangle(0, 0, 100, 100);
            FillRoundRectangle(g, rectangle, Color.Black, 20);

            pictureBox1.Image = bitmap;

        }



        /// <summary> 
        /// C# GDI+ 绘制圆角实心矩形 
        /// </summary> 
        /// <param name="g">Graphics 对象</param> 
        /// <param name="rectangle">要填充的矩形</param> 
        /// <param name="backColor">填充背景色</param> 
        /// <param name="r">圆角半径</param> 
        public static void FillRoundRectangle(Graphics g, Rectangle rectangle, Color backColor, int r)
        {
            rectangle = new Rectangle(rectangle.X, rectangle.Y, rectangle.Width - 1, rectangle.Height - 1);
            Brush b = new SolidBrush(backColor);
            g.FillPath(b, GetRoundRectangle(rectangle, r));
        }

        /// <summary> 
        /// 根据普通矩形得到圆角矩形的路径 
        /// </summary> 
        /// <param name="rectangle">原始矩形</param> 
        /// <param name="r">半径</param> 
        /// <returns>图形路径</returns> 
        private static GraphicsPath GetRoundRectangle(Rectangle rectangle, int r)
        {
            int l = 2 * r;
            // 把圆角矩形分成八段直线、弧的组合，依次加到路径中 
            GraphicsPath gp = new GraphicsPath();
            gp.AddLine(new Point(rectangle.X + r, rectangle.Y), new Point(rectangle.Right - r, rectangle.Y));
            gp.AddArc(new Rectangle(rectangle.Right - l, rectangle.Y, l, l), 270F, 90F);

            gp.AddLine(new Point(rectangle.Right, rectangle.Y + r), new Point(rectangle.Right, rectangle.Bottom - r));
            gp.AddArc(new Rectangle(rectangle.Right - l, rectangle.Bottom - l, l, l), 0F, 90F);

            gp.AddLine(new Point(rectangle.Right - r, rectangle.Bottom), new Point(rectangle.X + r, rectangle.Bottom));
            gp.AddArc(new Rectangle(rectangle.X, rectangle.Bottom - l, l, l), 90F, 90F);

            gp.AddLine(new Point(rectangle.X, rectangle.Bottom - r), new Point(rectangle.X, rectangle.Y + r));
            gp.AddArc(new Rectangle(rectangle.X, rectangle.Y, l, l), 180F, 90F);
            return gp;
        }


        /// <summary>
        /// 带圆角矩形
        /// </summary>
        /// <param name="radius">圆角半径</param>
        private void drawRoundedRect(Graphics g, System.Drawing.Pen pen, int x, int y, int width, int height, int radius)
        {
            //去掉圆角的锯齿
            g.SmoothingMode = SmoothingMode.HighQuality;

            //上
            g.DrawLine(pen, new PointF(x + radius, y), new PointF(x + width - radius, y));
            //下
            g.DrawLine(pen, new PointF(x + radius, y + height), new PointF(x + width - radius, y + height));
            //左
            g.DrawLine(pen, new PointF(x, y + radius), new PointF(x, y + height - radius));
            //右
            g.DrawLine(pen, new PointF(x + width, y + radius), new PointF(x + width, y + height - radius));

            //左上角
            g.DrawArc(pen, new Rectangle(x, y, radius * 2, radius * 2), 180, 90);
            //右上角
            g.DrawArc(pen, new Rectangle(x + width - radius * 2, y, radius * 2, radius * 2), 270, 90);
            //左下角
            g.DrawArc(pen, new Rectangle(x, y + height - radius * 2, radius * 2, radius * 2), 90, 90);
            //右下角
            g.DrawArc(pen, new Rectangle(x + width - radius * 2, y + height - radius * 2, radius * 2, radius * 2), 0, 90);
        }

    }
}