Improve auto ticks over axes with rangebreaks

src/plots/cartesian/axes.js

@@ -611,31 +611,43 @@ axes.calcTicks = function calcTicks(ax) {
  generateTicks();
 
  if(ax.rangebreaks) {
- var nTicksBefore = tickVals.length;
+ // replace ticks inside breaks that would get a tick
+ if(ax.tickmode === 'auto') {
+ for(var t = 0; t < tickVals.length; t++) {
+ var value = tickVals[t].value;
+ if(ax.maskBreaks(value) === BADNUM) {
+ // find which break we are in
+ for(var k = 0; k < ax._rangebreaks.length; k++) {
+ var brk = ax._rangebreaks[k];
+ if(value >= brk.min && value < brk.max) {
+ tickVals[t]._realV = tickVals[t].value;
+ tickVals[t].value = brk.max; // replace with break end
+ break;
+ }
+ }
+ }
+ }
+ }
 
- // remove ticks falling inside rangebreaks
-tickVals = tickVals.filter(function(d) {
- return ax.maskBreaks(d.value) !== BADNUM;
-});
+ // reduce ticks
+var len = tickVals.length;
+if(len > 2) {
+ var tf2 = 2 * (ax.tickfont ? ax.tickfont.size : 12);
 
- // if 'numerous' ticks get placed into rangebreaks,
- // increase dtick to generate more ticks,
- // so that some hopefully fall between rangebreaks
- if(ax.tickmode === 'auto' && tickVals.length < nTicksBefore / 6) {
- axes.autoTicks(ax, ax._roughDTick / 3);
- autoTickRound(ax);
- ax._tmin = axes.tickFirst(ax);
- generateTicks();
- tickVals = tickVals.filter(function(d) {
- return ax.maskBreaks(d.value) !== BADNUM;
- });
- }
+ var newTickVals = [];
+ var prevPos;
 
- // remove "overlapping" ticks (e.g. on either side of a break)
- var tf2 = ax.tickfont ? 1.5 * ax.tickfont.size : 0;
- tickVals = tickVals.filter(function(d, i, self) {
- return !(i && Math.abs(ax.c2p(d.value) - ax.c2p(self[i - 1].value)) < tf2);
- });
+ var signAx = axrev ? -1 : 1;
+ for(var q = axrev ? 0 : len - 1; signAx * q >= signAx * (axrev ? len - 1 : 0); q -= signAx) { // apply reverse loop to pick greater values in breaks first
+ var pos = ax.c2p(tickVals[q].value);
+
+ if(prevPos === undefined || Math.abs(pos - prevPos) > tf2) {
+ prevPos = pos;
+ newTickVals.push(tickVals[q]);
+ }
+ }
+ tickVals = newTickVals.reverse();
+ }
  }
 
  // If same angle over a full circle, the last tick vals is a duplicate.
@@ -663,6 +675,16 @@ axes.calcTicks = function calcTicks(ax) {
  false, // hover
  tickVals[i].minor // noSuffixPrefix
  );
+
+ if(tickVals[i]._realV) {
+ // correct label
+ ticksOut[i].text = axes.tickText(
+ ax,
+ tickVals[i]._realV,
+ false, // hover
+ tickVals[i].minor // noSuffixPrefix
+ ).text;
+ }
  }
 
  ax._inCalcTicks = false;