1.1.32

上次更新:2019-04-17
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解答

绘图结果:

完整的项目代码可以去 Github 上下载。

代码

public static void StartDrawing(double[] array, int N, double l, double r)
{
    //创建并显示绘图窗口
    Form2 DrawPad = new Form2();
    DrawPad.Show();

    //新建画布
    Graphics graphics = DrawPad.CreateGraphics();

    //翻转默认坐标系
    graphics.TranslateTransform(0, DrawPad.Height);
    graphics.ScaleTransform(1, -1);

    //对原始数组排序
    Array.Sort(array);

    //计算各区域的值
    int[] counts = new int[N];
    int index = 0;
    for (int i = 0; i < N; ++i)
    {
        for (int j = index; j < array.Length; ++j)
        {
            if (array[j] <= (r - l) * (i + 1) / N)
            {
                counts[i]++;
                index++;
            }
            else
            {
                break;
            }
        }
    }

    //获取最大值
    double max = counts.Max();
    //计算间距
    double unit = DrawPad.Width / (3.0 * N + 1);
    //计算直方图的矩形
    Rectangle[] rects = new Rectangle[N];
    rects[0].X = (int)unit;
    rects[0].Y = 0;
    rects[0].Width = (int)(2 * unit);
    rects[0].Height = (int)((counts[0] / max) * DrawPad.Height);
    for (int i = 1; i < N; ++i)
    {
        rects[i].X = (int)(rects[i - 1].X + 3 * unit);
        rects[i].Y = 0;
        rects[i].Width = (int)(2 * unit);
        rects[i].Height = (int)((counts[i] / (max + 1)) * DrawPad.Height);
    }

    //绘图
    graphics.FillRectangles(Brushes.Black, rects);

    //释放资源
    graphics.Dispose();
}
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