如何在 zedgraph 中绘制一条条形曲线，其中条形图彼此相邻？

Question

我想用条形图画一条曲线，条形图从 (x,0) 的左下角开始向上延伸到 (x,y)，宽度取决于下一个曲线点的开始位置

鉴于以下几点：

我想从

绘制柱状图

(0,3) to (1,3)
(1,4) to (3,4)
(3,2) to (4,2)

最后一个条的宽度可以是常量或 0。

在我的测试项目中，我使用了添加到 GraphPane 的 GraphObjList 的 BoxObj 个对象：

private void Form1_Shown(object sender, EventArgs e)
{
    // Make some sample data points
    PointF[] p = new PointF[360];
    for (int i = 0; i < p.Length; i++)
    {
        p[i] = new PointF(i,(float) Math.Sin(i * (Math.PI *2 )/360));
    }
    // 2 Curves, with different interpolations of their values
    for (int i = 0; i < p.Length; i++)
    {
        // Left point extends to the next point
        ppl.Add(p[i].X, p[i].Y);
        if (i+1 < p.Length)
            ppl.Add(p[i+1].X, p[i].Y);

        // Right point extends to the previous point
        if (i> 0)
            ppl1.Add(p[i- 1].X, p[i].Y);
        ppl1.Add(p[i].X, p[i].Y);
    }
    // Box objects like the curve of ppl, negative values still need to be corrected
    for (int i = 0; i < p.Length-1; i++)
    {
        BoxObj b = new BoxObj(p[i].X, p[i].Y, p[i+1].X-p[i].X, p[i].Y);
        b.IsClippedToChartRect = true;
        b.Fill = new Fill(Brushes.PapayaWhip);
        zedGraphControl1.GraphPane.GraphObjList.Add(b);
    }
    ZedGraph.CurveItem neueKurve = zedGraphControl1.GraphPane.AddCurve("+1",ppl , Color.Blue);
    ZedGraph.CurveItem neueKurve1 = zedGraphControl1.GraphPane.AddCurve("-1",ppl1 , Color.Green);
    ZedGraph.BarSettings bs = new ZedGraph.BarSettings(zedGraphControl1.GraphPane);

    bs.Type = ZedGraph.BarType.Stack;
    zedGraphControl1.GraphPane.AxisChange();
    zedGraphControl1.PerformAutoScale();
    zedGraphControl1.Invalidate();

}

这可行，但框对象的组织方式不像 CurveItem 对象。

Answer 1

解决方法很简单，找到zedgraph库的源码后就出来了这个

ZedGraph.LineItem neueKurve = new LineItem("+1", ppl, Color.Blue, SymbolType.None);
ZedGraph.LineItem neueKurve1 = new LineItem("+2", ppl1, Color.Green, SymbolType.None);
neueKurve.Line.StepType = StepType.ForwardSegment;
neueKurve.Line.Fill.Type = FillType.Brush;
neueKurve.Line.Fill.Brush = SystemBrushes.Info;
neueKurve1.Line.StepType = StepType.RearwardSegment;
zedGraphControl1.GraphPane.CurveList.Add(neueKurve);
zedGraphControl1.GraphPane.CurveList.Add(neueKurve1);

Line.StepType = StepType.RearwardSegment; 允许 select 曲线点的连接方式。

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