文章目录

用处及效果

准备工作

依然使用GDI+绘画，这个比较简单，就是画圆

开始

新增一个类UCSignalLamp，继承UserControl

添加属性

/// <summary>
        /// The is show border
        /// </summary>
        private bool isShowBorder = false;

        /// <summary>
        /// Gets or sets a value indicating whether this instance is show border.
        /// </summary>
        /// <value><c>true</c> if this instance is show border; otherwise, <c>false</c>.</value>
        [Description("是否显示边框"), Category("自定义")]
        public bool IsShowBorder
        {
            get { return isShowBorder; }
            set
            {
                isShowBorder = value;
                Refresh();
            }
        }

        /// <summary>
        /// The lamp color
        /// </summary>
        private Color[] lampColor = new Color[] { Color.FromArgb(255, 77, 59) };

        /// <summary>
        /// Gets or sets the color of the lamp.
        /// </summary>
        /// <value>The color of the lamp.</value>
        [Description("灯颜色，当需要闪烁时，至少需要2个及以上颜色，不需要闪烁则至少需要1个颜色"), Category("自定义")]
        public Color[] LampColor
        {
            get { return lampColor; }
            set
            {
                if (value == null || value.Length <= 0)
                    return;
                lampColor = value;
                Refresh();
            }
        }

        /// <summary>
        /// The is highlight
        /// </summary>
        private bool isHighlight = true;

        /// <summary>
        /// Gets or sets a value indicating whether this instance is highlight.
        /// </summary>
        /// <value><c>true</c> if this instance is highlight; otherwise, <c>false</c>.</value>
        [Description("是否高亮显示"), Category("自定义")]
        public bool IsHighlight
        {
            get { return isHighlight; }
            set
            {
                isHighlight = value;
                Refresh();
            }
        }

        /// <summary>
        /// The twinkle speed
        /// </summary>
        private int twinkleSpeed = 0;

        /// <summary>
        /// Gets or sets the twinkle speed.
        /// </summary>
        /// <value>The twinkle speed.</value>
        [Description("闪烁间隔时间（毫秒），当为0时不闪烁"), Category("自定义")]
        public int TwinkleSpeed
        {
            get { return twinkleSpeed; }
            set
            {
                if (value < 0)
                    return;
                twinkleSpeed = value;
                if (value == 0 || lampColor.Length <= 1)
                {
                    timer.Enabled = false;
                }
                else
                {
                    intColorIndex = 0;
                    timer.Interval = value;
                    timer.Enabled = true;
                }
                Refresh();
            }
        }
        /// <summary>
        /// The timer
        /// </summary>
        Timer timer;
        /// <summary>
        /// The int color index
        /// </summary>
        int intColorIndex = 0;

重绘

protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            var g = e.Graphics;
            g.SetGDIHigh();
            Color c1 = lampColor[intColorIndex];
            g.FillEllipse(new SolidBrush(c1), this.ClientRectangle);

            if (isHighlight)
            {
                GraphicsPath gp = new GraphicsPath();

                Rectangle rec = new Rectangle(5, 5, this.Width - 10, this.Height - 10);
                gp.AddEllipse(rec);

                Color[] surroundColor = new Color[] { c1 };
                PathGradientBrush pb = new PathGradientBrush(gp);
                pb.CenterColor = Color.White;
                pb.SurroundColors = surroundColor;
                g.FillPath(pb, gp);
            }

            if (isShowBorder)
            {
                g.DrawEllipse(new Pen(new SolidBrush(this.BackColor), 2), new Rectangle(4, 4, this.Width - 8, this.Height - 8));
            }
        }

全部代码

// ***********************************************************************
// Assembly         : HZH_Controls
// Created          : 2019-09-09
//
// ***********************************************************************
// <copyright file="UCSignalLamp.cs">
//     Copyright by Huang Zhenghui(黄正辉) All, QQ group:568015492 QQ:623128629 Email:623128629@qq.com
// </copyright>
//
// Blog: https://www.cnblogs.com/bfyx
// GitHub：https://github.com/kwwwvagaa/NetWinformControl
// gitee：https://gitee.com/kwwwvagaa/net_winform_custom_control.git
//
// If you use this code, please keep this note.
// ***********************************************************************
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.ComponentModel;

namespace HZH_Controls.Controls.FactoryControls.Lamp
{
    /// <summary>
    /// Class UCSignalLamp.
    /// Implements the <see cref="System.Windows.Forms.UserControl" />
    /// </summary>
    /// <seealso cref="System.Windows.Forms.UserControl" />
    public class UCSignalLamp : UserControl
    {
        /// <summary>
        /// The is show border
        /// </summary>
        private bool isShowBorder = false;

        /// <summary>
        /// Gets or sets a value indicating whether this instance is show border.
        /// </summary>
        /// <value><c>true</c> if this instance is show border; otherwise, <c>false</c>.</value>
        [Description("是否显示边框"), Category("自定义")]
        public bool IsShowBorder
        {
            get { return isShowBorder; }
            set
            {
                isShowBorder = value;
                Refresh();
            }
        }

        /// <summary>
        /// The lamp color
        /// </summary>
        private Color[] lampColor = new Color[] { Color.FromArgb(255, 77, 59) };

        /// <summary>
        /// Gets or sets the color of the lamp.
        /// </summary>
        /// <value>The color of the lamp.</value>
        [Description("灯颜色，当需要闪烁时，至少需要2个及以上颜色，不需要闪烁则至少需要1个颜色"), Category("自定义")]
        public Color[] LampColor
        {
            get { return lampColor; }
            set
            {
                if (value == null || value.Length <= 0)
                    return;
                lampColor = value;
                Refresh();
            }
        }

        /// <summary>
        /// The is highlight
        /// </summary>
        private bool isHighlight = true;

        /// <summary>
        /// Gets or sets a value indicating whether this instance is highlight.
        /// </summary>
        /// <value><c>true</c> if this instance is highlight; otherwise, <c>false</c>.</value>
        [Description("是否高亮显示"), Category("自定义")]
        public bool IsHighlight
        {
            get { return isHighlight; }
            set
            {
                isHighlight = value;
                Refresh();
            }
        }

        /// <summary>
        /// The twinkle speed
        /// </summary>
        private int twinkleSpeed = 0;

        /// <summary>
        /// Gets or sets the twinkle speed.
        /// </summary>
        /// <value>The twinkle speed.</value>
        [Description("闪烁间隔时间（毫秒），当为0时不闪烁"), Category("自定义")]
        public int TwinkleSpeed
        {
            get { return twinkleSpeed; }
            set
            {
                if (value < 0)
                    return;
                twinkleSpeed = value;
                if (value == 0 || lampColor.Length <= 1)
                {
                    timer.Enabled = false;
                }
                else
                {
                    intColorIndex = 0;
                    timer.Interval = value;
                    timer.Enabled = true;
                }
                Refresh();
            }
        }
        /// <summary>
        /// The timer
        /// </summary>
        Timer timer;
        /// <summary>
        /// The int color index
        /// </summary>
        int intColorIndex = 0;
        /// <summary>
        /// Initializes a new instance of the <see cref="UCSignalLamp"/> class.
        /// </summary>
        public UCSignalLamp()
        {
            this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            this.SetStyle(ControlStyles.DoubleBuffer, true);
            this.SetStyle(ControlStyles.ResizeRedraw, true);
            this.SetStyle(ControlStyles.Selectable, true);
            this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
            this.SetStyle(ControlStyles.UserPaint, true);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
            this.Size = new Size(50, 50);
            this.SizeChanged += UCSignalLamp_SizeChanged;
            timer = new Timer();
            timer.Interval = 200;
            timer.Tick += timer_Tick;
        }

        /// <summary>
        /// Handles the Tick event of the timer control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
        void timer_Tick(object sender, EventArgs e)
        {
            intColorIndex++;
            if (intColorIndex >= lampColor.Length)
                intColorIndex = 0;
            Refresh();
        }
        /// <summary>
        /// Handles the SizeChanged event of the UCSignalLamp control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
        void UCSignalLamp_SizeChanged(object sender, EventArgs e)
        {
            var maxSize = Math.Min(this.Width, this.Height);
            if (this.Width != maxSize)
                this.Width = maxSize;
            if (this.Height != maxSize)
                this.Height = maxSize;
        }

        /// <summary>
        /// 引发 <see cref="E:System.Windows.Forms.Control.Paint" /> 事件。
        /// </summary>
        /// <param name="e">包含事件数据的 <see cref="T:System.Windows.Forms.PaintEventArgs" />。</param>
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            var g = e.Graphics;
            g.SetGDIHigh();
            Color c1 = lampColor[intColorIndex];
            g.FillEllipse(new SolidBrush(c1), this.ClientRectangle);

            if (isHighlight)
            {
                GraphicsPath gp = new GraphicsPath();

                Rectangle rec = new Rectangle(5, 5, this.Width - 10, this.Height - 10);
                gp.AddEllipse(rec);

                Color[] surroundColor = new Color[] { c1 };
                PathGradientBrush pb = new PathGradientBrush(gp);
                pb.CenterColor = Color.White;
                pb.SurroundColors = surroundColor;
                g.FillPath(pb, gp);
            }

            if (isShowBorder)
            {
                g.DrawEllipse(new Pen(new SolidBrush(this.BackColor), 2), new Rectangle(4, 4, this.Width - 8, this.Height - 8));
            }
        }
    }
}