--- /dev/null
+/**
+ * @license
+ * Copyright 2012 Dan Vanderkam (danvdk@gmail.com)
+ * MIT-licensed (http://opensource.org/licenses/MIT)
+ */
+
+Dygraph.Plugins.Axes = (function() {
+
+/*
+
+Bits of jankiness:
+- Direct layout access
+- Direct area access
+- Should include calculation of ticks, not just the drawing.
+
+*/
+
+/**
+ * Draws the axes. This includes the labels on the x- and y-axes, as well
+ * as the tick marks on the axes.
+ * It does _not_ draw the grid lines which span the entire chart.
+ */
+var axes = function() {
+ this.xlabels_ = [];
+ this.ylabels_ = [];
+};
+
+axes.prototype.toString = function() {
+ return "Axes Plugin";
+};
+
+axes.prototype.activate = function(g) {
+ return {
+ layout: this.layout,
+ clearChart: this.clearChart,
+ drawChart: this.drawChart
+ };
+};
+
+axes.prototype.layout = function(e) {
+ var g = e.dygraph;
+
+ if (g.getOption('drawYAxis')) {
+ var w = g.getOption('yAxisLabelWidth') + 2 * g.getOption('axisTickSize');
+ var y_axis_rect = e.reserveSpaceLeft(w);
+ }
+
+ if (g.getOption('drawXAxis')) {
+ var h;
+ if (g.getOption('xAxisHeight')) {
+ h = g.getOption('xAxisHeight');
+ } else {
+ h = g.getOption('axisLabelFontSize') + 2 * g.getOption('axisTickSize');
+ }
+ var x_axis_rect = e.reserveSpaceBottom(h);
+ }
+
+ if (g.numAxes() == 2) {
+ // TODO(danvk): per-axis setting.
+ var w = g.getOption('yAxisLabelWidth') + 2 * g.getOption('axisTickSize');
+ var y2_axis_rect = e.reserveSpaceRight(w);
+ } else if (g.numAxes() > 2) {
+ g.error("Only two y-axes are supported at this time. (Trying " +
+ "to use " + g.numAxes() + ")");
+ }
+};
+
+axes.prototype.detachLabels = function() {
+ function removeArray(ary) {
+ for (var i = 0; i < ary.length; i++) {
+ var el = ary[i];
+ if (el.parentNode) el.parentNode.removeChild(el);
+ }
+ }
+
+ removeArray(this.xlabels_);
+ removeArray(this.ylabels_);
+ this.xlabels_ = [];
+ this.ylabels_ = [];
+};
+
+axes.prototype.clearChart = function(e) {
+ var g = e.dygraph;
+ this.detachLabels();
+}
+
+axes.prototype.drawChart = function(e) {
+ var g = e.dygraph;
+ if (!g.getOption('drawXAxis') && !g.getOption('drawYAxis')) return;
+
+ // Round pixels to half-integer boundaries for crisper drawing.
+ function halfUp(x) { return Math.round(x) + 0.5; }
+ function halfDown(y){ return Math.round(y) - 0.5; }
+
+ var context = e.drawingContext;
+ var containerDiv = e.canvas.parentNode;
+
+ var label, x, y, tick, i;
+
+ var labelStyle = {
+ position: "absolute",
+ fontSize: g.getOption('axisLabelFontSize') + "px",
+ zIndex: 10,
+ color: g.getOption('axisLabelColor'),
+ width: g.getOption('axisLabelWidth') + "px",
+ // height: this.attr_('axisLabelFontSize') + 2 + "px",
+ lineHeight: "normal", // Something other than "normal" line-height screws up label positioning.
+ overflow: "hidden"
+ };
+ var makeDiv = function(txt, axis, prec_axis) {
+ var div = document.createElement("div");
+ for (var name in labelStyle) {
+ if (labelStyle.hasOwnProperty(name)) {
+ div.style[name] = labelStyle[name];
+ }
+ }
+ var inner_div = document.createElement("div");
+ inner_div.className = 'dygraph-axis-label' +
+ ' dygraph-axis-label-' + axis +
+ (prec_axis ? ' dygraph-axis-label-' + prec_axis : '');
+ inner_div.innerHTML = txt;
+ div.appendChild(inner_div);
+ return div;
+ };
+
+ // axis lines
+ context.save();
+ context.strokeStyle = g.getOption('axisLineColor');
+ context.lineWidth = g.getOption('axisLineWidth');
+
+ var layout = g.layout_;
+ var area = e.dygraph.plotter_.area;
+
+ if (g.getOption('drawYAxis')) {
+ if (layout.yticks && layout.yticks.length > 0) {
+ var num_axes = g.numAxes();
+ for (i = 0; i < layout.yticks.length; i++) {
+ tick = layout.yticks[i];
+ if (typeof(tick) == "function") return;
+ x = area.x;
+ var sgn = 1;
+ var prec_axis = 'y1';
+ if (tick[0] == 1) { // right-side y-axis
+ x = area.x + area.w;
+ sgn = -1;
+ prec_axis = 'y2';
+ }
+ y = area.y + tick[1] * area.h;
+
+ /* Tick marks are currently clipped, so don't bother drawing them.
+ context.beginPath();
+ context.moveTo(halfUp(x), halfDown(y));
+ context.lineTo(halfUp(x - sgn * this.attr_('axisTickSize')), halfDown(y));
+ context.closePath();
+ context.stroke();
+ */
+
+ label = makeDiv(tick[2], 'y', num_axes == 2 ? prec_axis : null);
+ var top = (y - g.getOption('axisLabelFontSize') / 2);
+ if (top < 0) top = 0;
+
+ if (top + g.getOption('axisLabelFontSize') + 3 > this.height) {
+ label.style.bottom = "0px";
+ } else {
+ label.style.top = top + "px";
+ }
+ if (tick[0] === 0) {
+ label.style.left = (area.x - g.getOption('yAxisLabelWidth') - g.getOption('axisTickSize')) + "px";
+ label.style.textAlign = "right";
+ } else if (tick[0] == 1) {
+ label.style.left = (area.x + area.w +
+ g.getOption('axisTickSize')) + "px";
+ label.style.textAlign = "left";
+ }
+ label.style.width = g.getOption('yAxisLabelWidth') + "px";
+ containerDiv.appendChild(label);
+ this.ylabels_.push(label);
+ }
+
+ // The lowest tick on the y-axis often overlaps with the leftmost
+ // tick on the x-axis. Shift the bottom tick up a little bit to
+ // compensate if necessary.
+ var bottomTick = this.ylabels_[0];
+ var fontSize = g.getOption('axisLabelFontSize');
+ var bottom = parseInt(bottomTick.style.top, 10) + fontSize;
+ if (bottom > this.height - fontSize) {
+ bottomTick.style.top = (parseInt(bottomTick.style.top, 10) -
+ fontSize / 2) + "px";
+ }
+ }
+
+ // draw a vertical line on the left to separate the chart from the labels.
+ var axisX;
+ if (g.getOption('drawAxesAtZero')) {
+ var r = this.dygraph_.toPercentXCoord(0);
+ if (r > 1 || r < 0) r = 0;
+ axisX = halfUp(area.x + r * area.w);
+ } else {
+ axisX = halfUp(area.x);
+ }
+ context.beginPath();
+ context.moveTo(axisX, halfDown(area.y));
+ context.lineTo(axisX, halfDown(area.y + area.h));
+ context.closePath();
+ context.stroke();
+
+ // if there's a secondary y-axis, draw a vertical line for that, too.
+ if (g.numAxes() == 2) {
+ context.beginPath();
+ context.moveTo(halfDown(area.x + area.w), halfDown(area.y));
+ context.lineTo(halfDown(area.x + area.w), halfDown(area.y + area.h));
+ context.closePath();
+ context.stroke();
+ }
+ }
+
+ if (g.getOption('drawXAxis')) {
+ if (layout.xticks) {
+ for (i = 0; i < layout.xticks.length; i++) {
+ tick = layout.xticks[i];
+ x = area.x + tick[0] * area.w;
+ y = area.y + area.h;
+
+ /* Tick marks are currently clipped, so don't bother drawing them.
+ context.beginPath();
+ context.moveTo(halfUp(x), halfDown(y));
+ context.lineTo(halfUp(x), halfDown(y + this.attr_('axisTickSize')));
+ context.closePath();
+ context.stroke();
+ */
+
+ label = makeDiv(tick[1], 'x');
+ label.style.textAlign = "center";
+ label.style.top = (y + g.getOption('axisTickSize')) + 'px';
+
+ var left = (x - g.getOption('axisLabelWidth')/2);
+ if (left + g.getOption('axisLabelWidth') > this.width) {
+ left = this.width - g.getOption('xAxisLabelWidth');
+ label.style.textAlign = "right";
+ }
+ if (left < 0) {
+ left = 0;
+ label.style.textAlign = "left";
+ }
+
+ label.style.left = left + "px";
+ label.style.width = g.getOption('xAxisLabelWidth') + "px";
+ containerDiv.appendChild(label);
+ this.xlabels_.push(label);
+ }
+ }
+
+ context.beginPath();
+ var axisY;
+ if (g.getOption('drawAxesAtZero')) {
+ var r = g.toPercentYCoord(0, 0);
+ if (r > 1 || r < 0) r = 1;
+ axisY = halfDown(area.y + r * area.h);
+ } else {
+ axisY = halfDown(area.y + area.h);
+ }
+ context.moveTo(halfUp(area.x), axisY);
+ context.lineTo(halfUp(area.x + area.w), axisY);
+ context.closePath();
+ context.stroke();
+ }
+
+ context.restore();
+}
+
+return axes;
+})();
projects / dygraphs.git / commitdiff