--- /dev/null
+/**
+ * @license
+ * Copyright 2012 Dan Vanderkam (danvdk@gmail.com)
+ * MIT-licensed (http://opensource.org/licenses/MIT)
+ */
+
+/*global Dygraph:false */
+
+Dygraph.Plugins.Axes = (function() {
+
+'use strict';
+
+/*
+Bits of jankiness:
+- Direct layout access
+- Direct area access
+- Should include calculation of ticks, not just the drawing.
+
+Options left to make axis-friendly.
+ ('drawAxesAtZero')
+ ('xAxisHeight')
+*/
+
+/**
+ * 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,
+ willDrawChart: this.willDrawChart
+ };
+};
+
+axes.prototype.layout = function(e) {
+ var g = e.dygraph;
+
+ if (g.getOptionForAxis('drawAxis', 'y')) {
+ var w = g.getOptionForAxis('axisLabelWidth', 'y') + 2 * g.getOptionForAxis('axisTickSize', 'y');
+ e.reserveSpaceLeft(w);
+ }
+
+ if (g.getOptionForAxis('drawAxis', 'x')) {
+ var h;
+ // NOTE: I think this is probably broken now, since g.getOption() now
+ // hits the dictionary. (That is, g.getOption('xAxisHeight') now always
+ // has a value.)
+ if (g.getOption('xAxisHeight')) {
+ h = g.getOption('xAxisHeight');
+ } else {
+ h = g.getOptionForAxis('axisLabelFontSize', 'x') + 2 * g.getOptionForAxis('axisTickSize', 'x');
+ }
+ e.reserveSpaceBottom(h);
+ }
+
+ if (g.numAxes() == 2) {
+ if (g.getOptionForAxis('drawAxis', 'y2')) {
+ var w = g.getOptionForAxis('axisLabelWidth', 'y2') + 2 * g.getOptionForAxis('axisTickSize', 'y2');
+ 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) {
+ this.detachLabels();
+};
+
+axes.prototype.willDrawChart = function(e) {
+ var g = e.dygraph;
+
+ if (!g.getOptionForAxis('drawAxis', 'x') &&
+ !g.getOptionForAxis('drawAxis', 'y') &&
+ !g.getOptionForAxis('drawAxis', 'y2')) {
+ 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 canvasWidth = g.width_; // e.canvas.width is affected by pixel ratio.
+ var canvasHeight = g.height_;
+
+ var label, x, y, tick, i;
+
+ var makeLabelStyle = function(axis) {
+ return {
+ position: 'absolute',
+ fontSize: g.getOptionForAxis('axisLabelFontSize', axis) + 'px',
+ zIndex: 10,
+ color: g.getOptionForAxis('axisLabelColor', axis),
+ width: g.getOptionForAxis('axisLabelWidth', axis) + 'px',
+ // height: g.getOptionForAxis('axisLabelFontSize', 'x') + 2 + "px",
+ lineHeight: 'normal', // Something other than "normal" line-height screws up label positioning.
+ overflow: 'hidden'
+ };
+ };
+
+ var labelStyles = {
+ x : makeLabelStyle('x'),
+ y : makeLabelStyle('y'),
+ y2 : makeLabelStyle('y2')
+ };
+
+ var makeDiv = function(txt, axis, prec_axis) {
+ /*
+ * This seems to be called with the following three sets of axis/prec_axis:
+ * x: undefined
+ * y: y1
+ * y: y2
+ */
+ var div = document.createElement('div');
+ var labelStyle = labelStyles[prec_axis == 'y2' ? 'y2' : axis];
+ 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();
+
+ var layout = g.layout_;
+ var area = e.dygraph.plotter_.area;
+
+ // Helper for repeated axis-option accesses.
+ var makeOptionGetter = function(axis) {
+ return function(option) {
+ return g.getOptionForAxis(option, axis);
+ };
+ };
+
+ if (g.getOptionForAxis('drawAxis', 'y')) {
+ if (layout.yticks && layout.yticks.length > 0) {
+ var num_axes = g.numAxes();
+ var getOptions = [makeOptionGetter('y'), makeOptionGetter('y2')];
+ for (i = 0; i < layout.yticks.length; i++) {
+ tick = layout.yticks[i];
+ if (typeof(tick) == 'function') return; // <-- when would this happen?
+ x = area.x;
+ var sgn = 1;
+ var prec_axis = 'y1';
+ var getAxisOption = getOptions[0];
+ if (tick[0] == 1) { // right-side y-axis
+ x = area.x + area.w;
+ sgn = -1;
+ prec_axis = 'y2';
+ getAxisOption = getOptions[1];
+ }
+ var fontSize = getAxisOption('axisLabelFontSize');
+ 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 - fontSize / 2);
+ if (top < 0) top = 0;
+
+ if (top + fontSize + 3 > canvasHeight) {
+ label.style.bottom = '0';
+ } else {
+ label.style.top = top + 'px';
+ }
+ if (tick[0] === 0) {
+ label.style.left = (area.x - getAxisOption('axisLabelWidth') - getAxisOption('axisTickSize')) + 'px';
+ label.style.textAlign = 'right';
+ } else if (tick[0] == 1) {
+ label.style.left = (area.x + area.w +
+ getAxisOption('axisTickSize')) + 'px';
+ label.style.textAlign = 'left';
+ }
+ label.style.width = getAxisOption('axisLabelWidth') + '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];
+ // Interested in the y2 axis also?
+ var fontSize = g.getOptionForAxis('axisLabelFontSize', 'y');
+ var bottom = parseInt(bottomTick.style.top, 10) + fontSize;
+ if (bottom > canvasHeight - 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 = g.toPercentXCoord(0);
+ if (r > 1 || r < 0 || isNaN(r)) r = 0;
+ axisX = halfUp(area.x + r * area.w);
+ } else {
+ axisX = halfUp(area.x);
+ }
+
+ context.strokeStyle = g.getOptionForAxis('axisLineColor', 'y');
+ context.lineWidth = g.getOptionForAxis('axisLineWidth', 'y');
+
+ 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.strokeStyle = g.getOptionForAxis('axisLineColor', 'y2');
+ context.lineWidth = g.getOptionForAxis('axisLineWidth', 'y2');
+ 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.getOptionForAxis('drawAxis', 'x')) {
+ if (layout.xticks) {
+ var getAxisOption = makeOptionGetter('x');
+ 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 + getAxisOption('axisTickSize')) + 'px';
+
+ var left = (x - getAxisOption('axisLabelWidth')/2);
+ if (left + getAxisOption('axisLabelWidth') > canvasWidth) {
+ left = canvasWidth - getAxisOption('axisLabelWidth');
+ label.style.textAlign = 'right';
+ }
+ if (left < 0) {
+ left = 0;
+ label.style.textAlign = 'left';
+ }
+
+ label.style.left = left + 'px';
+ label.style.width = getAxisOption('axisLabelWidth') + 'px';
+ containerDiv.appendChild(label);
+ this.xlabels_.push(label);
+ }
+ }
+
+ context.strokeStyle = g.getOptionForAxis('axisLineColor', 'x');
+ context.lineWidth = g.getOptionForAxis('axisLineWidth', 'x');
+ 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 / blobdiff