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-/**
- * @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.
- ('axisTickSize')
- ('drawAxesAtZero')
- ('xAxisHeight')
-
-These too. What is the difference between axisLablelWidth and {x,y}AxisLabelWidth?
- ('axisLabelWidth')
- ('xAxisLabelWidth')
- ('yAxisLabelWidth')
-*/
-
-/**
- * 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.getOption('drawYAxis')) {
- var w = g.getOption('yAxisLabelWidth') + 2 * g.getOption('axisTickSize');
- e.reserveSpaceLeft(w);
- }
-
- if (g.getOption('drawXAxis')) {
- 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.getOption('axisTickSize');
- }
- e.reserveSpaceBottom(h);
- }
-
- if (g.numAxes() == 2) {
- // TODO(danvk): introduce a 'drawAxis' per-axis property.
- if (g.getOption('drawYAxis')) {
- // TODO(danvk): per-axis setting.
- var w = g.getOption('yAxisLabelWidth') + 2 * g.getOption('axisTickSize');
- 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.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 canvasWidth = e.canvas.width;
- var canvasHeight = e.canvas.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.getOption('axisLabelWidth') + "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;
-
- 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';
- }
- var fontSize = g.getOptionForAxis('axisLabelFontSize', prec_axis);
- 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 = "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];
- // 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.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') > canvasWidth) {
- left = canvasWidth - 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.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;
-})();