绪论

为了方便毕设的一个代码复用。

控件重绘

圆形标签：Lable

右键、添加、用户控件

修改基类为Lable,

public partial class CircleLable : Label

修改函数InitializeComponent()为
private void InitializeComponent()
{
components = new System.ComponentModel.Container();
}

绘制操作

  1. 初始化设置：ControlStyles标志设置、初始尺寸、工作区、背景色
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    //ControlStyles设置
    SetStyle(ControlStyles.UserPaint, true);
    SetStyle(ControlStyles.AllPaintingInWmPaint, true);//减少闪烁
    SetStyle(ControlStyles.OptimizedDoubleBuffer, true);//绘制到缓冲区，双缓冲设置减少闪烁
    SetStyle(ControlStyles.ResizeRedraw, true);//调整大小，进行重绘
    SetStyle(ControlStyles.Selectable, true);//可以接受焦点
    SetStyle(ControlStyles.SupportsTransparentBackColor, true);//背景色

    this.Size = new Size(80, 60);
    BackColor = Color.Transparent;
    rect = this.ClientRectangle;
  2. 属性扩展：背景色、边框粗细、边框色
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    //背景色   边框色   边框粗细
            private Color bgColor = Color.LightGray;
            /// <summary>
            /// 背景画刷
            /// </summary>
            public Color BgColor
            {
                get { return bgColor; }
                set
                {
                    bgColor = value;
                    Invalidate();
                }
            }
  3. 控件重绘：标签的背景、边框、文本 Paint

完整代码

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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 UIDesign.UControls
{
    public partial class CircleLable : Label
    {
        public CircleLable()
        {
            InitializeComponent();
            //ControlStyles设置
            SetStyle(ControlStyles.UserPaint, true);
            SetStyle(ControlStyles.AllPaintingInWmPaint, true);//减少闪烁
            SetStyle(ControlStyles.OptimizedDoubleBuffer, true);//绘制到缓冲区，双缓冲设置减少闪烁
            SetStyle(ControlStyles.ResizeRedraw, true);//调整大小，进行重绘
            SetStyle(ControlStyles.Selectable, true);//可以接受焦点
            SetStyle(ControlStyles.SupportsTransparentBackColor, true);//背景色

            this.Size = new Size(80, 60);
            BackColor = Color.Transparent;
            rect = this.ClientRectangle;
        }
        Rectangle rect;//工作区

        //背景色   边框色   边框粗细
        private Color bgColor = Color.LightGray;
        /// <summary>
        /// 背景画刷
        /// </summary>
        public Color BgColor
        {
            get { return bgColor; }
            set
            {
                bgColor = value;
                Invalidate();
            }
        }

        private Color borderColor = Color.Gray;
        /// <summary>
        /// 边框画刷
        /// </summary>
        public Color BorderColor
        {
            get { return borderColor; }
            set
            {
                borderColor = value;
                Invalidate();
            }
        }

        private int borderWidth = 0;
        /// <summary>
        /// 边框粗细
        /// </summary>
        public int BorderWidth
        {
            get { return borderWidth; }
            set
            {
                borderWidth = value;
                Invalidate();
            }
        }

        protected override void OnSizeChanged(EventArgs e)
        {
            rect = ClientRectangle;
            rect.Width -= 1;
            rect.Height -= 1;
        }

        /// <summary>
        /// 重绘控件
        /// </summary>
        /// <param name="e"></param>
        protected override void OnPaint(PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            g.SmoothingMode = SmoothingMode.HighQuality;
            //边框   背景
            Rectangle rectBg;
            if (borderWidth > 0)//有边框
            {
                g.FillEllipse(new SolidBrush(BorderColor), rect);//边框椭圆
                rectBg = new Rectangle(rect.X + borderWidth, rect.Y + borderWidth, rect.Width - 2 * borderWidth, rect.Height - 2 * borderWidth);
            }
            else
                rectBg = rect;

            //背景填充
            g.FillEllipse(new SolidBrush(BgColor), rectBg);
            StringFormat format = new StringFormat();
            format.LineAlignment = StringAlignment.Center;
            format.Alignment = StringAlignment.Center;
            //文本绘制
            SolidBrush fontBrush = new SolidBrush(this.ForeColor);
            g.DrawString(this.Text, this.Font, fontBrush, rect, format);
        }
    }

}

实现步骤

  1. 新建类比如“USwitch.cs”；
  2. 引用命名控件
    using System.Windows.Forms;
  3. 派生与Control
    public class USwitch :Control