Question

使用Graphics.DrawArc方法时遇到一个小问题。使用时，它比实际尺寸短。我将此控件从找到here

的其他帖子中删除

我正在尝试将其转换为具有某些属性的UserControl并展开它。问题是，当我设定每个百分比50％的百分比时，它会变短......

这是UserControl在50％时的样子......它应该在圆圈的底部居中（蓝色）。我已尽力调整一切，但我现在迷失了。

这是我目前的代码......

Color _ProgressCompletedColor = SystemColors.MenuHighlight;
    Color _ProgressNotCompleted = Color.LightGray;
    Int32 _ProgressThickness = 2;
    Single _ProgressCompleted = 25;

    public AttuneProgressBar()
    {
        InitializeComponent();
    }

    public Single PercentageCompleted
    {
        get
        {
            return this._ProgressCompleted;
        }
        set
        {
            this._ProgressCompleted = value;
            this.Invalidate();
        }
    }

    public Int32 ProgressBarThickness
    {
        get
        {
            return this._ProgressThickness;
        }
        set
        {
            this._ProgressThickness = value;
            this.Invalidate();
        }
    }

    public Color ProgressNotCompletedColor
    {
        get
        {
            return this._ProgressNotCompleted;
        }
        set
        {
            this._ProgressNotCompleted = value;
            this.Invalidate();
        }
    }

    public Color ProgressCompletedColor
    {
        get
        {
            return this._ProgressCompletedColor;
        }
        set
        {
            this._ProgressCompletedColor = value;
            this.Invalidate();
        }
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        // Call the OnPaint method of the base class.
        base.OnPaint(e);

        DrawProgress(e.Graphics, new Rectangle(new Point(1,1), new Size(this.ClientSize.Width - 3, this.ClientSize.Height - 3)), PercentageCompleted);
    }

    private void DrawProgress(Graphics g, Rectangle rec, Single percentage)
    {  
        Single progressAngle = (360 / 100 * percentage);
        Single remainderAngle = 360 - progressAngle;

        try
        {
            using (Pen progressPen = new Pen(ProgressCompletedColor, ProgressBarThickness), remainderPen = new Pen(ProgressNotCompletedColor, ProgressBarThickness))
            {
                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
                g.DrawArc(progressPen, rec, -90, progressAngle);
                g.DrawArc(remainderPen, rec, progressAngle - 90, remainderAngle);
            }
        }
        catch (Exception exc) { }
    }

}

Answer 1

您正在使用整数计算角度。当你这样做时：

mean

意味着

temp <- list.files(pattern="chr*.txt")
lst <- lapply(temp, read.table, header=FALSE)
Reduce('+', lst)/length(lst)

这当然会导致错误。如果你想继续使用整数，有一个简单的解决方法：

angle = 360 / 100 * percentage;

这种方式在乘法之前不会向下舍入。或者你可以一直使用浮动：

angle = 3 * percentage;

DrawArc即将推出

1 个答案: