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C#控件开发2—流动管道

article 2025/1/5 6:54:41

1.定义属性

管道的（两端转向、样式、边沿颜色、中间颜色、激活）
流动条的（速度、长度、宽度、间隙、颜色）

//属性示例：按照示例添加以上各种属性
private float moveSpeed = 0.3f;
[Browsable(true)]
[Category("布局_G")]
[Description("流动条速度，负数为反向")]  //属性说明
public float MoveSpeed
{
    get { return moveSpeed; }
    set
    {
        this.moveSpeed = value;
        this.Invalidate();  //重绘
    }
}

2.画布重绘

水平管道分为左、中、右三部分；垂直管道分为上、中、下；分别绘制（两端不动朝向的情况）
设置画布质量、渐近线比例、颜色
画椭圆：PaintEllipse（图形、笔、绘制路径…）
画矩形：PaintRectangle（图形、笔、绘制路径…）
画虚线（流动条）：AddArc（添加椭圆）、AddLine（添加直线）
运用两个画椭圆、画矩形的方法，见3

#region 画布

//字段
private Graphics g;   //GPI绘图
private Pen p;  //画笔
private float startOffset = 0; //短划线起始位置
private Timer myTimer;

protected override void OnPaint(PaintEventArgs e)
{
    //画布质量
    g = e.Graphics;
    g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
    g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
    g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
    g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
    ColorBlend colorBlend = new ColorBlend();  //渐变色设置

    //渐近线比例、颜色
    colorBlend.Positions = new float[] { 0.0f, 0.5f, 1.0f };
    colorBlend.Colors = new Color[] { this.pipeColorEdge, this.pipeColorCenter, this.pipeColorEdge };

    //画笔初始化
    this.p = new Pen(this.pipeColorBorder, 1.0f);

    //管道绘制（水平）
    if (this.pipeStyle == PipeStyle.Horizontal)
    {
        //矩形画刷
        LinearGradientBrush linearGradientBrush = new LinearGradientBrush(new Point(0, 0), new Point(0, this.Height), pipeColorEdge, pipeColorEdge);
        linearGradientBrush.InterpolationColors = colorBlend;

        //绘制左部分
        switch (this.pipeTurnLeft)
        {
            case PipeTurn.Up:
                this.PaintEllipse(g, colorBlend, p, new Rectangle(0, this.Height * (-1)-1, this.Height * 2, this.Height * 2), 90.0f, 90.0f);
                break;
            case PipeTurn.Down:
                this.PaintEllipse(g, colorBlend, p, new Rectangle(0, 0, this.Height * 2, this.Height * 2), 180.0f, 90.0f);
                break;
            default:
                this.PaintRectangle(g, linearGradientBrush, p, new Rectangle(-1, 0, this.Height+1, this.Height));
                break;
        }

        //绘制右部分
        switch (this.pipeTurnRight)
        {
            case PipeTurn.Up:
                this.PaintEllipse(g, colorBlend, p, new Rectangle(this.Width - this.Height * 2, this.Height * (-1)-1, this.Height * 2, this.Height * 2), 0.0f, 90.0f);
                break;
            case PipeTurn.Down:
                this.PaintEllipse(g, colorBlend, p, new Rectangle(this.Width - this.Height * 2, 0, this.Height * 2, this.Height * 2), 270.0f, 90.0f);
                break;
            default:
                this.PaintRectangle(g, linearGradientBrush, p, new Rectangle(this.Width - this.Height, 0, this.Height, this.Height));
                break;
        }

        //绘制中间
        if (this.Width > this.Height * 2)
        {
            this.PaintRectangle(g, linearGradientBrush, p, new Rectangle(this.Height - 1, 0, this.Width - this.Height * 2 + 2, this.Height));
        }

        //绘制流动条
        if (isActive)
        {
            //流动条路径
            GraphicsPath path = new GraphicsPath();

            //虚线路径—左边
            switch (this.pipeTurnLeft)
            {
                case PipeTurn.Up:
                    path.AddArc(new Rectangle(this.Height / 2, this.Height / 2 * (-1) -1, this.Height, this.Height), 181.0f, -91.0f);
                    break;
                case PipeTurn.Down:
                    path.AddArc(new Rectangle(this.Height / 2, this.Height / 2, this.Height, this.Height), 180.0f, 90.0f);
                    break;
                default:
                    path.AddLine(-1, this.Height / 2, this.Height+1, this.Height / 2);
                    break;
            }

            //虚线路径—中间
            if (this.Width > this.Height * 2)
            {
                path.AddLine(this.Height, this.Height / 2, this.Width - this.Height -1, this.Height / 2);
            }

            //虚线路径—右边
            switch (this.pipeTurnRight)
            {
                case PipeTurn.Up:
                    path.AddArc(new Rectangle(this.Width - 1 - this.Height * 3 / 2, -this.Height / 2-1 , this.Height, this.Height), 88f, -91.0f);
                    break;
                case PipeTurn.Down:
                    path.AddArc(new Rectangle(this.Width - 1 - this.Height * 3 / 2, this.Height / 2, this.Height, this.Height), 270.0f, 90.0f);
                    break;
                default:
                    path.AddLine(this.Width - this.Height, this.Height / 2, this.Width , this.Height / 2);
                    break;
            }

            //画虚线，关键用笔和路径来
            Pen pen = new Pen(this.flowColor, this.flowWidth);
            pen.DashStyle = DashStyle.Custom;
            pen.DashPattern = new float[]
            {
                flowLength,flowLengthGap
            };
            pen.DashOffset = this.startOffset;
            g.DrawPath(pen, path);
        }
    }
    //管道绘制（垂直）
    else
    {
        //矩形画刷
        LinearGradientBrush linearGradientBrush2 = new LinearGradientBrush(new Point(0, 0), new Point(this.Width, 0), pipeColorEdge, pipeColorEdge);
        linearGradientBrush2.InterpolationColors = colorBlend;

        //绘制上部分
        switch (this.pipeTurnLeft)
        {
            case PipeTurn.Left:
                this.PaintEllipse(g, colorBlend, p, new Rectangle(-this.Width-1, 0, this.Width * 2, this.Width * 2), 270.0f, 90.0f);
                break;
            case PipeTurn.Right:
                this.PaintEllipse(g, colorBlend, p, new Rectangle(0, 0, this.Width * 2, this.Width * 2), 180.0f, 90.0f);
                break;
            default:
                this.PaintRectangle(g, linearGradientBrush2, p, new Rectangle(0, -1, this.Width, this.Width+1));
                break;
        }

        //绘制下部分
        switch (this.pipeTurnRight)
        {
            case PipeTurn.Left:
                this.PaintEllipse(g, colorBlend, p, new Rectangle(-this.Width-1, this.Height - this.Width * 2, this.Width * 2, this.Width * 2), 0.0f, 90.0f);
                break;
            case PipeTurn.Right:
                this.PaintEllipse(g, colorBlend, p, new Rectangle(0, this.Height - this.Width * 2, this.Width * 2, this.Width * 2), 90f, 90.0f);
                break;
            default:
                this.PaintRectangle(g, linearGradientBrush2, p, new Rectangle(0, this.Height - this.Width, this.Width, this.Width));
                break;
        }

        //绘制中间
        if (this.Height > this.Width * 2)
        {
            this.PaintRectangle(g, linearGradientBrush2, p, new Rectangle(0, this.Width - 1, this.Width, this.Height - this.Width * 2 + 2));
        }

        //绘制流动条
        if (isActive)
        {
            //流动条路径
            GraphicsPath path = new GraphicsPath();

            //虚线路径—上边
            switch (this.pipeTurnLeft)
            {
                case PipeTurn.Left:
                    path.AddArc(new Rectangle(-this.Width / 2-1, this.Width / 2, this.Width, this.Width), 270.0f, 88.0f);
                    break;
                case PipeTurn.Right:
                    path.AddArc(new Rectangle(this.Width / 2, this.Width / 2, this.Width, this.Width), 271.0f, -90.0f);
                    break;
                default:
                    path.AddLine(this.Width / 2, -1, this.Width / 2, this.Width);
                    break;
            }

            //虚线路径—中间
            if (this.Height > this.Width * 2)
            {
                path.AddLine(this.Width / 2, this.Width, this.Width / 2, this.Height - this.Width-1 );
            }

            //虚线路径—下边
            switch (this.pipeTurnRight)
            {
                case PipeTurn.Left:
                    path.AddArc(new Rectangle(-this.Width / 2-1, this.Height - this.Width * 3 / 2-1, this.Width, this.Width), 0f, 91.0f);
                    break;
                case PipeTurn.Right:
                    path.AddArc(new Rectangle(this.Width / 2, this.Height  - this.Width * 3 / 2, this.Width, this.Width), 180.0f, -90.0f);
                    break;
                default:
                    path.AddLine(this.Width / 2, this.Height - this.Width, this.Width / 2, this.Height );
                    break;
            }

            //画虚线，关键用笔和路径来
            Pen pen = new Pen(this.flowColor, this.flowWidth);
            pen.DashStyle = DashStyle.Custom;
            pen.DashPattern = new float[]
            {
                flowLength,flowLengthGap
            };
            pen.DashOffset = this.startOffset;
            g.DrawPath(pen, path);
        }
    }
}

#endregion

3. 图形方法

画渐变色半圆的方法：PaintEllipse
画渐变色矩形的方法：PaintRectangle

#region 画管道的方法
/// <summary>
/// 画渐变色半圆的方法
/// </summary>
/// <param name="g">画布</param>
/// <param name="colorBlend"></param>
/// <param name="p"></param>
/// <param name="rect"></param>
/// <param name="startAngle"></param>
/// <param name="sweepAngle"></param>
private void PaintEllipse(Graphics g, ColorBlend colorBlend, Pen p, Rectangle rect, float startAngle, float sweepAngle)
{
    //第一步：创建GPI路径
    GraphicsPath path = new GraphicsPath();
    path.AddEllipse(rect);

    //第二步：渐变色填充
    PathGradientBrush brush = new PathGradientBrush(path);
    brush.CenterPoint = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2);
    brush.InterpolationColors = colorBlend;

    //第三步：绘制管道
    g.FillPie(brush, rect, startAngle, sweepAngle);

    //第四步：绘制边线
    g.DrawArc(p, rect, startAngle, sweepAngle);
}

/// <summary>
/// 画渐变色矩形的方法
/// </summary>
/// <param name="g">画布</param>
/// <param name="brush">画刷</param>
/// <param name="pen">笔</param>
/// <param name="rectangle">矩形</param>
private void PaintRectangle(Graphics g, Brush brush, Pen pen, Rectangle rectangle)
{
    //填充矩形
    g.FillRectangle(brush, rectangle);

    switch (this.pipeStyle)
    {
        case PipeStyle.Horizontal:
            g.DrawLine(pen, rectangle.X, rectangle.Y, rectangle.X + rectangle.Width, rectangle.Y);
            g.DrawLine(pen, rectangle.X, rectangle.Y + rectangle.Height - 1, rectangle.X + rectangle.Width, rectangle.Height);
            break;
        case PipeStyle.Vertical:
            g.DrawLine(pen, rectangle.X, rectangle.Y, rectangle.X, rectangle.Y + rectangle.Height);
            g.DrawLine(pen, rectangle.X + rectangle.Width - 1, rectangle.Y, rectangle.X + rectangle.Width - 1, rectangle.Height);
            break;
        default:
            break;
    }
}

#endregion

4.关键代码

绘制的椭圆、线——代码释义

path.AddArc(new Rectangle(this.Height / 2, this.Height / 2, this.Height, this.Height), 180.0f, 90.0f);

path.AddLine(-1, this.Height / 2, this.Height+1, this.Height / 2);

绘制的椭圆、线（Rectangle）<x,y【圆切矩形相对于控件原点<左上角>的坐标】,宽，高，开始角度，扫描角度>理解了就好画了

可以流动的关键要素

---构造函数
  
     //流动条流动速度（刷新速度）
     this.myTimer = new Timer();
     myTimer.Interval = 50;
     this.myTimer.Tick += MyTimer_Tick; ;

 }

 #region 定时循环
 private void MyTimer_Tick(object sender, EventArgs e)
 {
     this.startOffset = this.startOffset - this.moveSpeed;

     if (this.startOffset > this.flowLength + this.flowLengthGap || this.startOffset < (this.flowLength + this.flowLengthGap) * (-1))
     { this.startOffset = 0; }
     this.Invalidate();
 }
 
 #endregion