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流程圖控件GoJS教程：如何創(chuàng)建分級(jí)面板（二）

翻譯|使用教程|編輯：楊鵬連|2020-08-25 11:14:38.577|閱讀 313 次

概述：本教程介紹如何創(chuàng)建分級(jí)面板，在“刻度”面板Panel.Graduated，平定期刻度/文字標(biāo)簽沿主子圖的行程形狀。刻度面板可以視為顯示一系列值的比例尺。

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GoJS是一款功能強(qiáng)大，快速且輕量級(jí)的流程圖控件，可幫助你在JavaScript 和HTML5 Canvas程序中創(chuàng)建流程圖，且極大地簡(jiǎn)化您的JavaScript / Canvas 程序。

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刻度線外觀

刻度線相對(duì)于主要形狀路徑的出現(xiàn)由一些屬性控制：

Shape.graduatedStart / TextBlock.graduatedStart- 沿主筆劃的小數(shù)距離，在該筆劃或標(biāo)簽處開始繪制
Shape.graduatedEnd / TextBlock.graduatedEnd- 沿主筆觸的小數(shù)距離，超出該距離將不會(huì)繪制此刻度或標(biāo)簽
GraphObject.alignmentFocus- 刻度線或標(biāo)簽上與計(jì)算的路徑點(diǎn)對(duì)齊的點(diǎn)，默認(rèn)為頂部中心
GraphObject.segmentOffset- 從主筆畫偏移TextBlock標(biāo)簽的程度-Y值指定距路徑的距離
GraphObject.segmentOrientation- 如何相對(duì)于主筆畫旋轉(zhuǎn)TextBlock標(biāo)簽

僅TextBlock標(biāo)簽應(yīng)設(shè)置GraphObject.segmentOffset或GraphObject.segmentOrientation。它們對(duì)主要形狀或刻度形狀沒有影響。這些GraphObject屬性也通常用于放置“鏈接”標(biāo)簽，如“鏈接”標(biāo)簽上“ 簡(jiǎn)介”頁(yè)面所示，并且由“分級(jí)面板”以類似方式使用。

設(shè)置graduatedStart和/或graduatedEnd僅允許沿主筆劃的一部分繪制刻度線：

diagram.add(
  $(go.Part, "Graduated",
    $(go.Shape, { geometryString: "M0 0 H400" }),
    $(go.Shape, { geometryString: "M0 0 V10", graduatedStart: .25, graduatedEnd: .75 })
  ));

在這種情況下，現(xiàn)在僅在主體形狀的中部繪制刻度線。

設(shè)置alignmentFocus為go.Spot.Bottom將會(huì)使刻度線的底部與主筆劃對(duì)齊：

diagram.add(
  $(go.Part, "Graduated",
    $(go.Shape, { geometryString: "M0 0 H400" }),
    $(go.Shape, { geometryString: "M0 0 V10", alignmentFocus: go.Spot.Bottom })
  ));

設(shè)置alignmentFocus為go.Spot.Center將會(huì)使刻度線在路徑中居中：

diagram.add(
  $(go.Part, "Graduated",
    $(go.Shape, { geometryString: "M0 0 H400" }),
    $(go.Shape, { geometryString: "M0 0 V10 M0 20 V30", alignmentFocus: go.Spot.Center })
  ));

注意形狀的幾何形狀中的間隙。

設(shè)置segmentOffset標(biāo)簽可以使它們?cè)诳潭染€附近更具可讀性：

diagram.add(
  $(go.Part, "Graduated",
    $(go.Shape, { geometryString: "M0 0 H400" }),
    $(go.Shape, { geometryString: "M0 0 V10" }),
    // offset to display below ticks
    $(go.TextBlock, { segmentOffset: new go.Point(0, 12) })
  ));

設(shè)置segmentOrientation標(biāo)簽可以改變標(biāo)簽相對(duì)于主筆畫的繪制角度：

diagram.add(
  $(go.Part, "Graduated",
    $(go.Shape, { geometryString: "M0 0 H400" }),
    $(go.Shape, { geometryString: "M0 0 V10" }),
    // change the angle of the text
    $(go.TextBlock, { segmentOrientation: go.Link.OrientMinus90 })
  ));

請(qǐng)注意，每個(gè)標(biāo)簽的頂部中心點(diǎn)正好位于該值沿路徑的點(diǎn)處。
結(jié)合這兩個(gè)屬性并重新對(duì)齊刻度線：

diagram.add(
  $(go.Part, "Graduated",
    $(go.Shape, { geometryString: "M0 0 H400" }),
    $(go.Shape, { geometryString: "M0 0 V10", alignmentFocus: go.Spot.Bottom }),
    $(go.TextBlock,
      {
        alignmentFocus: go.Spot.Left,
        segmentOffset: new go.Point(0, -12),
        segmentOrientation: go.Link.OrientMinus90
      }
    )
  ));

這些屬性的行為類似于“鏈接”標(biāo)簽，因?yàn)樗鼈冺憫?yīng)主筆劃的方向。例如，讓我們旋轉(zhuǎn)主要形狀，使其從左上角到右下角傾斜向下。

diagram.add(
  $(go.Part, "Graduated",
    $(go.Shape, { geometryString: "M0 0 L285 285" }),
    $(go.Shape, { geometryString: "M0 0 V10", alignmentFocus: go.Spot.Bottom }),
    $(go.TextBlock,
      {
        alignmentFocus: go.Spot.Left,
        segmentOffset: new go.Point(0, -12),
        segmentOrientation: go.Link.OrientMinus90
      }
    )
  ));

現(xiàn)在讓我們嘗試一條曲線：

diagram.add(
  $(go.Part, "Graduated",
    $(go.Shape, "Curve1", { desiredSize: new go.Size(285, 285) }),
    $(go.Shape, { geometryString: "M0 0 V10", alignmentFocus: go.Spot.Bottom }),
    $(go.TextBlock,
      {
        alignmentFocus: go.Spot.Left,
        segmentOffset: new go.Point(0, -12),
        segmentOrientation: go.Link.OrientMinus90
      }
    )
  ));

這是另一個(gè)常見的配置：

diagram.add(
  $(go.Part, "Graduated",
    $(go.Shape, { geometryString: "M0 0 A120 120 0 0 1 200 0" }),  // an arc
    $(go.Shape, { geometryString: "M0 0 V10" }),
    $(go.TextBlock,
      {
        segmentOffset: new go.Point(0, 12),
        segmentOrientation: go.Link.OrientAlong
      }
    )
  ));

對(duì)于垂直線，無需旋轉(zhuǎn)文本：

diagram.add(
  $(go.Part, "Graduated",
    $(go.Shape, { geometryString: "M0 0 A120 120 0 0 1 200 0" }),  // an arc
    $(go.Shape, { geometryString: "M0 0 V10" }),
    $(go.TextBlock,
      {
        segmentOffset: new go.Point(0, 12),
        segmentOrientation: go.Link.OrientAlong
      }
    )
  ));

我們也可以從下到上：

diagram.add(
  $(go.Part, "Graduated",
    $(go.Shape, { geometryString: "M0 0 V-400" }),
    $(go.Shape, { geometryString: "M0 0 V10", alignmentFocus: go.Spot.Top }),
    $(go.TextBlock,
      {
        alignmentFocus: go.Spot.Left,
        segmentOffset: new go.Point(0, 12)
      }
    )
  ));

請(qǐng)注意幾何圖形如何從0變?yōu)?，-400，因?yàn)樨?fù)Y值在屏幕/頁(yè)面上更高。請(qǐng)注意，由于所有內(nèi)容都是相對(duì)于路徑的，因此刻度線和標(biāo)簽將在相反的一側(cè)，因此我們還更改了alignmentFocus和segmentOffset以具有與上一個(gè)示例相反的值。

最后，如果方向是Link.OrientNone， Link.OrientAlong或Link.OrientUpright之一，則將考慮標(biāo)簽上指定的任何角度。對(duì)于“沿”和“垂直”，將在TextBlock的點(diǎn)將角度添加到主路徑的坡度。

  diagram.add(
    $(go.Part, "Spot",
      $(go.Panel, "Graduated",
        $(go.Shape, { geometryString: "M0 0 L100 0 100 100 L0 100" }),
        $(go.Shape, { geometryString: "M0 0 V10" }),
        $(go.TextBlock,
          {
            interval: 5,
            angle: 45,
            segmentOffset: new go.Point(0, 12)
          }
        )
      ),
      $(go.TextBlock, "None")
    ));

  diagram.add(
    $(go.Part, "Spot",
      $(go.Panel, "Graduated",
        $(go.Shape, { geometryString: "M0 0 L100 0 100 100 L0 100" }),
        $(go.Shape, { geometryString: "M0 0 V10" }),
        $(go.TextBlock,
          {
            interval: 5,
            angle: 45,
            segmentOrientation: go.Link.OrientAlong,
            segmentOffset: new go.Point(0, 12)
          }
        )
      ),
      $(go.TextBlock, "Along")
    ));

  diagram.add(
    $(go.Part, "Spot",
      $(go.Panel, "Graduated",
        $(go.Shape, { geometryString: "M0 0 L100 0 100 100 L0 100" }),
        $(go.Shape, { geometryString: "M0 0 V10" }),
        $(go.TextBlock,
          {
            interval: 5,
            angle: 45,
            segmentOrientation: go.Link.OrientUpright,
            segmentOffset: new go.Point(0, 12)
          }
        )
      ),
      $(go.TextBlock, "Upright")
    ));