From ce9f49d330d17a2cfdaa03be7f3b04286a285bfb Mon Sep 17 00:00:00 2001
From: HarryStevens <harryjosephstevens@gmail.com>
Date: Sun, 27 Sep 2020 13:22:53 -0400
Subject: [PATCH] Improve heuristic for deciding how much distance the bar
 represents by allowing it to scale to 1x, 2x, 4x and 5x of an exponent.

---
 README.md                     |  28 ++++++++++++++--------------
 build/d3-geo-scale-bar.js     |  16 +++++++++-------
 build/d3-geo-scale-bar.min.js |   1 -
 build/d3-geo-scale-bar.zip    | Bin 11339 -> 0 bytes
 src/geoScaleBar.js            |  19 ++++++++++++-------
 5 files changed, 35 insertions(+), 29 deletions(-)
 delete mode 100644 build/d3-geo-scale-bar.min.js
 delete mode 100644 build/d3-geo-scale-bar.zip

diff --git a/README.md b/README.md
index 099d111..34da5ea 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ d3-geo-scale-bar is a JavaScript library and [D3.js](https://d3js.org/) plugin t
 If you use NPM, `npm install d3-geo-scale-bar`. Otherwise, download the [latest release](https://github.com/HarryStevens/d3-geo-scale-bar/raw/master/build/d3-geo-scale-bar.zip). AMD, CommonJS, and vanilla environments are supported. In vanilla, a d3 global is exported:
 
 ```html
-<script src="https://unpkg.com/d3-geo-scale-bar@1.1.0/build/d3-geo-scale-bar.min.js"></script>
+<script src="https://unpkg.com/d3-geo-scale-bar@1.1.1/build/d3-geo-scale-bar.min.js"></script>
 <script>
 
 const projection = d3.geoMercator()
@@ -93,15 +93,15 @@ If <i>top</i> is specified, sets the top position to the specified value which m
 
 ### Sizing
 
-<a name="scaleBar_distance" href="#scaleBar_distance">#</a> <i>scaleBar</i>.<b>distance</b>([<i>distance</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L157 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarWapo)
+<a name="scaleBar_distance" href="#scaleBar_distance">#</a> <i>scaleBar</i>.<b>distance</b>([<i>distance</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L162 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarWapo)
 
-If <i>distance</i> is specifed, sets the maximum distance of the scale bar and returns the scale bar. [Defaults](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L40) to the smallest exponent of 10 or 10x4 that will render the bar at least 60 pixels wide. If <i>distance</i> is not specified, returns the current maximum distance of the scale bar.
+If <i>distance</i> is specifed, sets the maximum distance of the scale bar and returns the scale bar. [Defaults](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L40) to the smallest exponent of 10, 10x2, 10x4 or 10x5 that will render the bar at least 60 pixels wide. If <i>distance</i> is not specified, returns the current maximum distance of the scale bar.
 
-<a name="scaleBar_radius" href="#scaleBar_radius">#</a> <i>scaleBar</i>.<b>radius</b>([<i>radius</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L185 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarMoon)
+<a name="scaleBar_radius" href="#scaleBar_radius">#</a> <i>scaleBar</i>.<b>radius</b>([<i>radius</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L190 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarMoon)
 
 If <i>radius</i> is specifed, sets the radius of the sphere on which the scale bar is placed and returns the scale bar. Defaults to 6371.0088, [the mean radius of Earth in kilometers](https://en.wikipedia.org/wiki/Earth_radius#Mean_radius). If you set [<i>units</i>](#scaleBar_units) to d3.[geoScaleMiles](#geoScaleMiles), the <i>radius</i> will also update to 3958.7613, [the mean radius of Earth in miles](https://en.wikipedia.org/wiki/Earth_radius#Mean_radius). You can set the *radius* to any number you like, useful for [mapping planets other than Earth](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#spaceBars). If <i>radius</i> is not specified, returns the current radius.
 
-<a name="scaleBar_units" href="#scaleBar_units">#</a> <i>scaleBar</i>.<b>units</b>([<i>units</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L213 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarWapo)
+<a name="scaleBar_units" href="#scaleBar_units">#</a> <i>scaleBar</i>.<b>units</b>([<i>units</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L218 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarWapo)
 
 If <i>units</i> is specifed, sets the [radius](#scaleBar_radius) of the scale bar to the corresponding units and returns the scale bar. Defaults to [d3.geoScaleKilometers](https://github.com/HarryStevens/d3-geo-scale-bar#geoScaleKilometers), which sets the label to "Kilometers" and the radius to 6371.0088, [the mean radius of Earth in kilometers](https://en.wikipedia.org/wiki/Earth_radius#Mean_radius). Note that the Earth's radius varies depending upon latitude, so if extremely high precision matters, you can [perform your own calculation of the radius](https://web.archive.org/web/20200118181437/https://rechneronline.de/earth-radius/) and pass the output to <i>scaleBar</i>.[radius](#scaleBar_radius).
 
@@ -125,15 +125,15 @@ When passed to <i>scaleBar</i>.[units](#scaleBar_units), sets the [radius](scale
 
 ### Styling
 
-<a name="scaleBar_label" href="#scaleBar_label">#</a> <i>scaleBar</i>.<b>label</b>([<i>label</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L165 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarWapo)
+<a name="scaleBar_label" href="#scaleBar_label">#</a> <i>scaleBar</i>.<b>label</b>([<i>label</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L170 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarWapo)
 
 If a <i>label</i> string is specified, sets the text in the scale bar's label to the specified string and returns the scale bar. Defaults to the capitalized unit, e.g. "Kilometers". If label is specified as null, removes the label. If <i>label</i> is not specified, returns the current label.
 
-<a name="scaleBar_labelAnchor" href="#scaleBar_labelAnchor">#</a> <i>scaleBar</i>.<b>labelAnchor</b>([<i>anchor</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L169 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarWapo)
+<a name="scaleBar_labelAnchor" href="#scaleBar_labelAnchor">#</a> <i>scaleBar</i>.<b>labelAnchor</b>([<i>anchor</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L174 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarWapo)
 
 If an <i>anchor</i> string is specified, aligns the scale bar's label such that it is either at the "start" of the scale bar, the "middle" of the scale bar, or the "end" of the scale bar, and returns the scale bar. Defaults to "start". If an <i>anchor</i> string is not specified, returns the current anchor.
 
-<a name="scaleBar_orient" href="#scaleBar_orient">#</a> <i>scaleBar</i>.<b>orient</b>([<i>orientation</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L177 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarTop)
+<a name="scaleBar_orient" href="#scaleBar_orient">#</a> <i>scaleBar</i>.<b>orient</b>([<i>orientation</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L182 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarTop)
 
 If an <i>orientation</i> is specified, styles the bar according to the specified orientation and returns the scale bar. If an <i>orientation</i> is not specified, returns the current orientation as a string, either "top" or "bottom". Defaults to [d3.geoScaleBottom](#geoScaleBottom).
 
@@ -153,29 +153,29 @@ When passed to <i>scaleBar</i>.[orient](#scaleBar_orient), orients the scale bar
 scaleBar.orient(d3.geoScaleTop);
 ```
 
-<a name="scaleBar_tickFormat" href="#scaleBar_tickFormat">#</a> <i>scaleBar</i>.<b>tickFormat</b>([<i>formatter</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L197 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarPositioned)
+<a name="scaleBar_tickFormat" href="#scaleBar_tickFormat">#</a> <i>scaleBar</i>.<b>tickFormat</b>([<i>formatter</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L202 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarPositioned)
 
 If a <i>formatter</i> function is specified, each tick value is passed through the formatter before being displayed. Defaults to (d, i, e) => Math.round(d), where d is the tick number, i is the tick index, and e is an array of all tick data. If a <i>formatter</i> is not specified, returns the current formatter.
 
-<a name="scaleBar_tickPadding" href="#scaleBar_tickPadding">#</a> <i>scaleBar</i>.<b>tickPadding</b>([<i>padding</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L201 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarTop)
+<a name="scaleBar_tickPadding" href="#scaleBar_tickPadding">#</a> <i>scaleBar</i>.<b>tickPadding</b>([<i>padding</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L206 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarTop)
 
 If <i>padding</i> is specified, sets the padding to the specified value in pixels and returns the scale bar. If <i>padding</i> is not specified, returns the current padding which defaults to 2 pixels.
 
-<a name="scaleBar_tickSize" href="#scaleBar_tickSize">#</a> <i>scaleBar</i>.<b>tickSize</b>([<i>size</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L205 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarWapo)
+<a name="scaleBar_tickSize" href="#scaleBar_tickSize">#</a> <i>scaleBar</i>.<b>tickSize</b>([<i>size</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L210 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarWapo)
 
 If a <i>size</i> number is specified, sets the vertical tick size of the scale bar in pixels and returns the scale bar. Defaults to 4. If <i>size</i> is not specified, returns the current tick size of the scale bar.
 
-<a name="scaleBar_tickValues" href="#scaleBar_tickValues">#</a> <i>scaleBar</i>.<b>tickValues</b>([<i>values</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L209 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarBottom)
+<a name="scaleBar_tickValues" href="#scaleBar_tickValues">#</a> <i>scaleBar</i>.<b>tickValues</b>([<i>values</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L214 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#scaleBarBottom)
 
 If a <i>values</i> array is specified, sets the tick values to the specified values in the array rather than using the scale bar’s automatic tick generator, and returns the scale bar. Defaults to [0, kilometers / 4, kilometers / 2, kilometers]. Passing <i>null</i> removes the values and their associated ticks from the scale bar. If <i>values</i> is not specified, returns the current tick values.
 
 ### Zooming
 
-<a name="scaleBar_zoomClamp" href="#scaleBar_zoomClamp">#</a> <i>scaleBar</i>.<b>zoomClamp</b>([<i>clamp</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L217 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#zooming)
+<a name="scaleBar_zoomClamp" href="#scaleBar_zoomClamp">#</a> <i>scaleBar</i>.<b>zoomClamp</b>([<i>clamp</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L222 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#zooming)
 
 If a boolean <i>clamp</i> is specified, sets the scale bar's zooming behavior and returns the scale bar. If clamp is true, the scale bar's width will remain constant as the [zoom factor](#scaleBar_zoomFactor) changes. If clamp is false, the scale bar's width will change with the zoom factor, but the distance represented by the scale bar will remain constant unless the bar becomes too small or too large. If <i>clamp</i> is not specified, returns the current clamp behavior, which defaults to true.
 
-<a name="scaleBar_zoomFactor" href="#scaleBar_zoomFactor">#</a> <i>scaleBar</i>.<b>zoomFactor</b>([<i>k</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L221 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#zooming)
+<a name="scaleBar_zoomFactor" href="#scaleBar_zoomFactor">#</a> <i>scaleBar</i>.<b>zoomFactor</b>([<i>k</i>]) · [Source](https://github.com/HarryStevens/d3-geo-scale-bar/blob/master/src/geoScaleBar.js#L226 "Source"), [Example](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#zooming)
 
 If <i>k</i> is specified, zooms the scale bar by the <i>k</i> [scale factor](https://github.com/d3/d3-zoom#zoomTransform) and returns the scale bar. This will commonly [be used](https://observablehq.com/@harrystevens/introducing-d3-geo-scale-bar#zooming) in conjunction with [d3-zoom](https://github.com/d3/d3-zoom):
 
diff --git a/build/d3-geo-scale-bar.js b/build/d3-geo-scale-bar.js
index 00ec5e7..d333bac 100644
--- a/build/d3-geo-scale-bar.js
+++ b/build/d3-geo-scale-bar.js
@@ -261,19 +261,21 @@
       if (distance) {
         barDistance = distance;
         barWidth = barDistance / (geoDistance(start, projection.invert([x + 1, y])) * radius);
-      } // Otherwise, make it an exponent of 10 or 10x4 with a minimum width of 60px 
+      } // Otherwise, make it an exponent of 10, 10x2, 10x4 or 10x5 with a minimum width of 60px 
       else {
           var dist = .01,
               minWidth = 60 / (zoomClamp ? 1 : zoomFactor),
               iters = 0,
-              maxiters = 100;
+              maxiters = 100,
+              multiples = [1, 2, 4, 5];
 
           while (barWidth < minWidth && iters < maxiters) {
-            barDistance = dist;
-            barWidth = barDistance / (geoDistance(start, projection.invert([x + 1, y])) * radius);
-            if (barWidth >= minWidth) break;
-            barDistance = dist * 4;
-            barWidth = barDistance / (geoDistance(start, projection.invert([x + 1, y])) * radius);
+            for (var i = 0, l = multiples.length; i < l; i++) {
+              barDistance = dist * multiples[i];
+              barWidth = barDistance / (geoDistance(start, projection.invert([x + 1, y])) * radius);
+              if (barWidth >= minWidth) break;
+            }
+
             dist *= 10;
             iters++;
           }
diff --git a/build/d3-geo-scale-bar.min.js b/build/d3-geo-scale-bar.min.js
deleted file mode 100644
index 755937b..0000000
--- a/build/d3-geo-scale-bar.min.js
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/src/geoScaleBar.js b/src/geoScaleBar.js
index 7bcec63..0f8e34e 100644
--- a/src/geoScaleBar.js
+++ b/src/geoScaleBar.js
@@ -32,24 +32,29 @@ export default function(){
         start = projection.invert([x, y]);
     
     let barDistance = 0, barWidth = 0;
+    
     // If the distance has been set explicitly, calculate the bar's width
     if (distance){
       barDistance = distance;
       barWidth = barDistance / (geoDistance(start, projection.invert([x + 1, y])) * radius);
     }
-    // Otherwise, make it an exponent of 10 or 10x4 with a minimum width of 60px 
+
+    // Otherwise, make it an exponent of 10, 10x2, 10x4 or 10x5 with a minimum width of 60px 
     else {
       let dist = .01,
           minWidth = 60 / (zoomClamp ? 1 : zoomFactor),
           iters = 0,
-          maxiters = 100;
+          maxiters = 100,
+          multiples = [1, 2, 4, 5];
       
       while (barWidth < minWidth && iters < maxiters){
-        barDistance = dist;
-        barWidth = barDistance / (geoDistance(start, projection.invert([x + 1, y])) * radius);
-        if (barWidth >= minWidth) break;
-        barDistance = dist * 4;
-        barWidth = barDistance / (geoDistance(start, projection.invert([x + 1, y])) * radius);
+
+        for (let i = 0, l = multiples.length; i < l; i++){
+          barDistance = dist * multiples[i];
+          barWidth = barDistance / (geoDistance(start, projection.invert([x + 1, y])) * radius);
+          if (barWidth >= minWidth) break;
+        }
+
         dist *= 10;
         iters++;
       }