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[BUG]: Automargin for quiver plots is a little off with `arrowref: 'paper'`

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評估

難度
4/5
預估耗時
3-5 天
新手友好度
55/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
活躍
技術堆疊
javascript
領域
data-visualization

研究方向

從 src/traces/quiver/calc.js 大約第 200-206 行開始，並將提供的 quiver 圖形重現出來，同時將 arrowref 設定為 paper。追蹤箭頭端點和 automargin 範圍是如何相對於座標軸刻度計算的。完成的標準是初始繪圖區域包含所有箭頭端點，即使資料的長寬比與 1:1 有顯著差異。

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描述

bug P2 plotly-internal size: 3
Desired behavior

Quiver automargin should always result in an initial plot area which contains all arrow endpoints.

Current behavior

The current quiver implementation calculates the arrow endpoints assuming arrowref: 'data', uses those endpoints to compute the automargin extents, and then if arrowref is 'paper'`, applies an adjustment factor to the arrow endpoints.

If the x:y aspect ratio of the data is pretty close to 1:1, this works OK because the arrow endpoints don't change much. But if the aspect ratio of the data is very far from 1:1, this can result in an initial plot where the arrow endpoints extend outside of the plotted area.

Example
Figure definition: 
{
  "data": [
    {
      "type": "quiver",
      "uhoverformat": ".3f",
      "yhoverformat": ".3f",
      "xhoverfomrat": ".3f",
      "vhoverformat": ".3f",
      "x": [0],
      "y": [0],
      "u": [1],
      "v": [0.1],
      "arrowref": "paper"
    }
  ],
  "layout": {
    "width": 800,
    "height": 600,
    "showlegend": false
  }
}

Screenshot:

Image

Notice how the tip of the arrow extends off the right side of the plot.

Fix

The relevant logic is around lines 200-206 in src/traces/quiver/calc.js.

It's a bit of a chicken-and-egg problem, because when arrowref is 'paper', the data position of the arrow endpoints depends on the axis scales, which depend on the position of the arrow endpoints. I think there is probably an algebraic solution but haven't quite been able to figure it out. Alternatively there's probably an iterative or approximate approach we could apply here that would still be an improvement over the current behavior.

主要語言
JavaScript
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