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+// Features:
+// 1. category axis
+// 2. ceil values of translate/x/y to int for half pixel antialiasing
+// 3. multiline tick text
+var tickTextCharSize;
+function c3_axis(d3, params) {
+ var scale = d3.scale.linear(), orient = "bottom", innerTickSize = 6, outerTickSize, tickPadding = 3, tickValues = null, tickFormat, tickArguments;
+
+ var tickOffset = 0, tickCulling = true, tickCentered;
+
+ params = params || {};
+ outerTickSize = params.withOuterTick ? 6 : 0;
+
+ function axisX(selection, x) {
+ selection.attr("transform", function (d) {
+ return "translate(" + Math.ceil(x(d) + tickOffset) + ", 0)";
+ });
+ }
+ function axisY(selection, y) {
+ selection.attr("transform", function (d) {
+ return "translate(0," + Math.ceil(y(d)) + ")";
+ });
+ }
+ function scaleExtent(domain) {
+ var start = domain[0], stop = domain[domain.length - 1];
+ return start < stop ? [ start, stop ] : [ stop, start ];
+ }
+ function generateTicks(scale) {
+ var i, domain, ticks = [];
+ if (scale.ticks) {
+ return scale.ticks.apply(scale, tickArguments);
+ }
+ domain = scale.domain();
+ for (i = Math.ceil(domain[0]); i < domain[1]; i++) {
+ ticks.push(i);
+ }
+ if (ticks.length > 0 && ticks[0] > 0) {
+ ticks.unshift(ticks[0] - (ticks[1] - ticks[0]));
+ }
+ return ticks;
+ }
+ function copyScale() {
+ var newScale = scale.copy(), domain;
+ if (params.isCategory) {
+ domain = scale.domain();
+ newScale.domain([domain[0], domain[1] - 1]);
+ }
+ return newScale;
+ }
+ function textFormatted(v) {
+ var formatted = tickFormat ? tickFormat(v) : v;
+ return typeof formatted !== 'undefined' ? formatted : '';
+ }
+ function getSizeFor1Char(tick) {
+ if (tickTextCharSize) {
+ return tickTextCharSize;
+ }
+ var size = {
+ h: 11.5,
+ w: 5.5
+ };
+ tick.select('text').text(textFormatted).each(function (d) {
+ var box = this.getBoundingClientRect(),
+ text = textFormatted(d),
+ h = box.height,
+ w = text ? (box.width / text.length) : undefined;
+ if (h && w) {
+ size.h = h;
+ size.w = w;
+ }
+ }).text('');
+ tickTextCharSize = size;
+ return size;
+ }
+ function transitionise(selection) {
+ return params.withoutTransition ? selection : d3.transition(selection);
+ }
+ function axis(g) {
+ g.each(function () {
+ var g = axis.g = d3.select(this);
+
+ var scale0 = this.__chart__ || scale, scale1 = this.__chart__ = copyScale();
+
+ var ticks = tickValues ? tickValues : generateTicks(scale1),
+ tick = g.selectAll(".tick").data(ticks, scale1),
+ tickEnter = tick.enter().insert("g", ".domain").attr("class", "tick").style("opacity", 1e-6),
+ // MEMO: No exit transition. The reason is this transition affects max tick width calculation because old tick will be included in the ticks.
+ tickExit = tick.exit().remove(),
+ tickUpdate = transitionise(tick).style("opacity", 1),
+ tickTransform, tickX, tickY;
+
+ var range = scale.rangeExtent ? scale.rangeExtent() : scaleExtent(scale.range()),
+ path = g.selectAll(".domain").data([ 0 ]),
+ pathUpdate = (path.enter().append("path").attr("class", "domain"), transitionise(path));
+ tickEnter.append("line");
+ tickEnter.append("text");
+
+ var lineEnter = tickEnter.select("line"),
+ lineUpdate = tickUpdate.select("line"),
+ textEnter = tickEnter.select("text"),
+ textUpdate = tickUpdate.select("text");
+
+ if (params.isCategory) {
+ tickOffset = Math.ceil((scale1(1) - scale1(0)) / 2);
+ tickX = tickCentered ? 0 : tickOffset;
+ tickY = tickCentered ? tickOffset : 0;
+ } else {
+ tickOffset = tickX = 0;
+ }
+
+ var text, tspan, sizeFor1Char = getSizeFor1Char(g.select('.tick')), counts = [];
+ var tickLength = Math.max(innerTickSize, 0) + tickPadding,
+ isVertical = orient === 'left' || orient === 'right';
+
+ // this should be called only when category axis
+ function splitTickText(d, maxWidth) {
+ var tickText = textFormatted(d),
+ subtext, spaceIndex, textWidth, splitted = [];
+
+ if (Object.prototype.toString.call(tickText) === "[object Array]") {
+ return tickText;
+ }
+
+ if (!maxWidth || maxWidth <= 0) {
+ maxWidth = isVertical ? 95 : params.isCategory ? (Math.ceil(scale1(ticks[1]) - scale1(ticks[0])) - 12) : 110;
+ }
+
+ function split(splitted, text) {
+ spaceIndex = undefined;
+ for (var i = 1; i < text.length; i++) {
+ if (text.charAt(i) === ' ') {
+ spaceIndex = i;
+ }
+ subtext = text.substr(0, i + 1);
+ textWidth = sizeFor1Char.w * subtext.length;
+ // if text width gets over tick width, split by space index or crrent index
+ if (maxWidth < textWidth) {
+ return split(
+ splitted.concat(text.substr(0, spaceIndex ? spaceIndex : i)),
+ text.slice(spaceIndex ? spaceIndex + 1 : i)
+ );
+ }
+ }
+ return splitted.concat(text);
+ }
+
+ return split(splitted, tickText + "");
+ }
+
+ function tspanDy(d, i) {
+ var dy = sizeFor1Char.h;
+ if (i === 0) {
+ if (orient === 'left' || orient === 'right') {
+ dy = -((counts[d.index] - 1) * (sizeFor1Char.h / 2) - 3);
+ } else {
+ dy = ".71em";
+ }
+ }
+ return dy;
+ }
+
+ function tickSize(d) {
+ var tickPosition = scale(d) + (tickCentered ? 0 : tickOffset);
+ return range[0] < tickPosition && tickPosition < range[1] ? innerTickSize : 0;
+ }
+
+ text = tick.select("text");
+ tspan = text.selectAll('tspan')
+ .data(function (d, i) {
+ var splitted = params.tickMultiline ? splitTickText(d, params.tickWidth) : [].concat(textFormatted(d));
+ counts[i] = splitted.length;
+ return splitted.map(function (s) {
+ return { index: i, splitted: s };
+ });
+ });
+ tspan.enter().append('tspan');
+ tspan.exit().remove();
+ tspan.text(function (d) { return d.splitted; });
+
+ var rotate = params.tickTextRotate;
+
+ function textAnchorForText(rotate) {
+ if (!rotate) {
+ return 'middle';
+ }
+ return rotate > 0 ? "start" : "end";
+ }
+ function textTransform(rotate) {
+ if (!rotate) {
+ return '';
+ }
+ return "rotate(" + rotate + ")";
+ }
+ function dxForText(rotate) {
+ if (!rotate) {
+ return 0;
+ }
+ return 8 * Math.sin(Math.PI * (rotate / 180));
+ }
+ function yForText(rotate) {
+ if (!rotate) {
+ return tickLength;
+ }
+ return 11.5 - 2.5 * (rotate / 15) * (rotate > 0 ? 1 : -1);
+ }
+
+ switch (orient) {
+ case "bottom":
+ {
+ tickTransform = axisX;
+ lineEnter.attr("y2", innerTickSize);
+ textEnter.attr("y", tickLength);
+ lineUpdate.attr("x1", tickX).attr("x2", tickX).attr("y2", tickSize);
+ textUpdate.attr("x", 0).attr("y", yForText(rotate))
+ .style("text-anchor", textAnchorForText(rotate))
+ .attr("transform", textTransform(rotate));
+ tspan.attr('x', 0).attr("dy", tspanDy).attr('dx', dxForText(rotate));
+ pathUpdate.attr("d", "M" + range[0] + "," + outerTickSize + "V0H" + range[1] + "V" + outerTickSize);
+ break;
+ }
+ case "top":
+ {
+ // TODO: rotated tick text
+ tickTransform = axisX;
+ lineEnter.attr("y2", -innerTickSize);
+ textEnter.attr("y", -tickLength);
+ lineUpdate.attr("x2", 0).attr("y2", -innerTickSize);
+ textUpdate.attr("x", 0).attr("y", -tickLength);
+ text.style("text-anchor", "middle");
+ tspan.attr('x', 0).attr("dy", "0em");
+ pathUpdate.attr("d", "M" + range[0] + "," + -outerTickSize + "V0H" + range[1] + "V" + -outerTickSize);
+ break;
+ }
+ case "left":
+ {
+ tickTransform = axisY;
+ lineEnter.attr("x2", -innerTickSize);
+ textEnter.attr("x", -tickLength);
+ lineUpdate.attr("x2", -innerTickSize).attr("y1", tickY).attr("y2", tickY);
+ textUpdate.attr("x", -tickLength).attr("y", tickOffset);
+ text.style("text-anchor", "end");
+ tspan.attr('x', -tickLength).attr("dy", tspanDy);
+ pathUpdate.attr("d", "M" + -outerTickSize + "," + range[0] + "H0V" + range[1] + "H" + -outerTickSize);
+ break;
+ }
+ case "right":
+ {
+ tickTransform = axisY;
+ lineEnter.attr("x2", innerTickSize);
+ textEnter.attr("x", tickLength);
+ lineUpdate.attr("x2", innerTickSize).attr("y2", 0);
+ textUpdate.attr("x", tickLength).attr("y", 0);
+ text.style("text-anchor", "start");
+ tspan.attr('x', tickLength).attr("dy", tspanDy);
+ pathUpdate.attr("d", "M" + outerTickSize + "," + range[0] + "H0V" + range[1] + "H" + outerTickSize);
+ break;
+ }
+ }
+ if (scale1.rangeBand) {
+ var x = scale1, dx = x.rangeBand() / 2;
+ scale0 = scale1 = function (d) {
+ return x(d) + dx;
+ };
+ } else if (scale0.rangeBand) {
+ scale0 = scale1;
+ } else {
+ tickExit.call(tickTransform, scale1);
+ }
+ tickEnter.call(tickTransform, scale0);
+ tickUpdate.call(tickTransform, scale1);
+ });
+ }
+ axis.scale = function (x) {
+ if (!arguments.length) { return scale; }
+ scale = x;
+ return axis;
+ };
+ axis.orient = function (x) {
+ if (!arguments.length) { return orient; }
+ orient = x in {top: 1, right: 1, bottom: 1, left: 1} ? x + "" : "bottom";
+ return axis;
+ };
+ axis.tickFormat = function (format) {
+ if (!arguments.length) { return tickFormat; }
+ tickFormat = format;
+ return axis;
+ };
+ axis.tickCentered = function (isCentered) {
+ if (!arguments.length) { return tickCentered; }
+ tickCentered = isCentered;
+ return axis;
+ };
+ axis.tickOffset = function () {
+ return tickOffset;
+ };
+ axis.tickInterval = function () {
+ var interval, length;
+ if (params.isCategory) {
+ interval = tickOffset * 2;
+ }
+ else {
+ length = axis.g.select('path.domain').node().getTotalLength() - outerTickSize * 2;
+ interval = length / axis.g.selectAll('line').size();
+ }
+ return interval === Infinity ? 0 : interval;
+ };
+ axis.ticks = function () {
+ if (!arguments.length) { return tickArguments; }
+ tickArguments = arguments;
+ return axis;
+ };
+ axis.tickCulling = function (culling) {
+ if (!arguments.length) { return tickCulling; }
+ tickCulling = culling;
+ return axis;
+ };
+ axis.tickValues = function (x) {
+ if (typeof x === 'function') {
+ tickValues = function () {
+ return x(scale.domain());
+ };
+ }
+ else {
+ if (!arguments.length) { return tickValues; }
+ tickValues = x;
+ }
+ return axis;
+ };
+ return axis;
+}