/* Javascript plotting library for jQuery, v. 0.2.
*
* Released under the MIT license by iola, December 2007.
*
*/
(function($) {
function Plot(target_, data_, options_) {
// data is on the form:
// [ series1 series2 ... ]
// where series is either just the data as [ [x1, y1], [x2, y2], ... ]
// or { data: [ [x1, y1], [x2, y2], ... ], label: "some label" }
var series = [];
var options = {
// the color theme used for graphs
colors: ["#edc240", "#afd8f8", "#cb4b4b", "#4da74d", "#9440ed"],
legend: {
show: true,
noColumns: 1, // number of colums in legend table
labelFormatter: null, // fn: string -> string
labelBoxBorderColor: "#ccc", // border color for the little label boxes
container: null, // container (as jQuery object) to put legend in, null means default on top of graph
position: "ne", // position of default legend container within plot
margin: 5, // distance from grid edge to default legend container within plot
backgroundColor: null, // null means auto-detect
backgroundOpacity: 0.85 // set to 0 to avoid background
},
xaxis: {
ticks: null, // either [1, 3] or [[1, "a"], 3]
noTicks: 5, // approximate number of ticks for auto-ticks
tickFormatter: defaultTickFormatter, // fn: number -> string
tickDecimals: null, // no. of decimals, null means auto
min: null, // min. value to show, null means set automatically
max: null, // max. value to show, null means set automatically
autoscaleMargin: 0 // margin in % to add if auto-setting min/max
},
yaxis: {
noTicks: 5,
ticks: null,
tickFormatter: defaultTickFormatter,
min: null,
max: null,
autoscaleMargin: 0.02
},
points: {
show: false,
radius: 3,
lineWidth: 2, // in pixels
fill: true,
fillColor: "#ffffff"
},
lines: {
show: false,
lineWidth: 2, // in pixels
fill: false,
fillColor: null
},
bars: {
show: false,
lineWidth: 2, // in pixels
barWidth: 1, // in units of the x axis
fill: true,
fillColor: null
},
grid: {
color: "#545454", // primary color used for outline and labels
backgroundColor: null, // null for transparent, else color
tickColor: "#dddddd", // color used for the ticks
labelMargin: 3 // in pixels
},
selection: {
mode: null, // one of null, "x", "y" or "xy"
color: "#e8cfac"
},
shadowSize: 4
};
var canvas = null, overlay = null;
var ctx = null, octx = null;
var target = target_;
var xaxis = {};
var yaxis = {};
var plotOffset = { left: 0, right: 0, top: 0, bottom: 0};
var labelMaxWidth = 0;
var labelMaxHeight = 0;
var canvasWidth = 0;
var canvasHeight = 0;
var plotWidth = 0;
var plotHeight = 0;
var hozScale = 0;
var vertScale = 0;
// initialize
series = parseData(data_);
parseOptions(options_);
fillInSeriesOptions();
constructCanvas();
bindEvents();
findDataRanges();
calculateRange(xaxis, options.xaxis);
extendXRangeIfNeededByBar();
calculateRange(yaxis, options.yaxis);
calculateTicks(xaxis, options.xaxis);
calculateTicks(yaxis, options.yaxis);
calculateSpacing();
draw();
insertLegend();
this.getCanvas = function() { return canvas; };
this.getPlotOffset = function() { return plotOffset; };
this.clearSelection = clearSelection;
this.setSelection = setSelection;
function parseData(d) {
var res = [];
for (var i = 0; i < d.length; ++i) {
var s;
if (d[i].data) {
s = {};
for (var v in d[i])
s[v] = d[i][v];
}
else {
s = { data: d[i] };
}
res.push(s);
}
return res;
}
function parseOptions(o) {
$.extend(true, options, o);
}
function constructCanvas() {
canvasWidth = target.width();
canvasHeight = target.height();
target.html(""); // clear target
target.css("position", "relative"); // for positioning labels and overlay
if (canvasWidth <= 0 || canvasHeight <= 0)
throw "Invalid dimensions for plot, width = " + canvasWidth + ", height = " + canvasHeight;
// the canvas
canvas = jQuery('').appendTo(target).get(0);
if (jQuery.browser.msie) // excanvas hack
canvas = window.G_vmlCanvasManager.initElement(canvas);
ctx = canvas.getContext("2d");
// overlay canvas for interactive features
overlay = jQuery('').appendTo(target).get(0);
if (jQuery.browser.msie) // excanvas hack
overlay = window.G_vmlCanvasManager.initElement(overlay);
octx = overlay.getContext("2d");
}
function bindEvents() {
if (options.selection.mode != null) {
$(overlay).mousedown(onMouseDown);
// FIXME: temp. work-around until jQuery bug 1871 is fixed
target.get(0).onmousemove = onMouseMove;
}
}
function findDataRanges() {
yaxis.datamin = xaxis.datamin = 0;
xaxis.datamax = yaxis.datamax = 1;
if (series.length == 0)
return;
// get datamin, datamax start values
var i, found = false;
for (i = 0; i < series.length; ++i) {
if (series[i].data.length > 0) {
xaxis.datamin = xaxis.datamax = series[i].data[0][0];
yaxis.datamin = yaxis.datamax = series[i].data[0][1];
found = true;
break;
}
}
if (!found)
return;
// then find real datamin, datamax
for (i = 0; i < series.length; ++i) {
var data = series[i].data;
for (var j = 0; j < data.length; ++j) {
var x = data[j][0];
var y = data[j][1];
if (x < xaxis.datamin)
xaxis.datamin = x;
else if (x > xaxis.datamax)
xaxis.datamax = x;
if (y < yaxis.datamin)
yaxis.datamin = y;
else if (y > yaxis.datamax)
yaxis.datamax = y;
}
}
}
function getTickSize(noTicks, min, max, decimals) {
var delta = (max - min) / noTicks;
var magn = getMagnitude(delta);
var norm = delta / magn; // norm is between 1.0 and 10.0
var tickSize = 1;
if (norm < 1.5)
tickSize = 1;
else if (norm < 2.25)
tickSize = 2;
else if (norm < 3)
tickSize = 2.5;
else if (norm < 7.5)
tickSize = 5;
else
tickSize = 10;
if (tickSize == 2.5 && decimals == 0)
tickSize = 2;
tickSize *= magn;
return tickSize;
}
function calculateRange(axis, axisOptions) {
var min = axisOptions.min != null ? axisOptions.min : axis.datamin;
var max = axisOptions.max != null ? axisOptions.max : axis.datamax;
var delta = max - min;
// check degenerate case
if (delta == 0.0) {
var widen;
if (max == 0.0)
widen = 1.0;
else
widen = 0.01;
axis.min = max - widen;
axis.max = max + widen;
}
else {
axis.tickSize = getTickSize(axisOptions.noTicks, min, max, axisOptions.tickDecimals);
// consider autoscaling
var margin;
if (axisOptions.min == null) {
// first add in a little margin
margin = axisOptions.autoscaleMargin;
if (margin != 0) {
min -= axis.tickSize * margin;
// make sure we don't go below zero if all
// values are positive
if (min < 0 && axis.datamin >= 0)
min = 0;
min = axis.tickSize * Math.floor(min / axis.tickSize);
}
}
if (axisOptions.max == null) {
margin = axisOptions.autoscaleMargin;
if (margin != 0) {
max += axis.tickSize * margin;
if (max > 0 && axis.datamax <= 0)
max = 0;
max = axis.tickSize * Math.ceil(max / axis.tickSize);
}
}
axis.min = min;
axis.max = max;
}
}
function extendXRangeIfNeededByBar() {
if (options.xaxis.max == null) {
// great, we're autoscaling, check if we might need a bump
var newmax = xaxis.max;
for (var i = 0; i < series.length; ++i)
if (series[i].bars.show && series[i].bars.barWidth + xaxis.datamax > newmax)
newmax = xaxis.max + series[i].bars.barWidth;
xaxis.max = newmax;
}
}
function defaultTickFormatter(val) {
return "" + val;
}
function calculateTicks(axis, axisOptions) {
var i;
axis.ticks = [];
if (axisOptions.ticks) {
var ticks = axisOptions.ticks;
if ($.isFunction(ticks))
// generate the ticks
ticks = ticks({ min: axis.min, max: axis.max });
// clean up the user-supplied ticks, copy them over
for (i = 0; i < ticks.length; ++i) {
var v, label;
var t = ticks[i];
if (typeof(t) == "object") {
v = t[0];
if (t.length > 1)
label = t[1];
else
label = axisOptions.tickFormatter(v);
}
else {
v = t;
label = axisOptions.tickFormatter(v);
}
axis.ticks[i] = { v: v, label: label };
}
}
else {
// round to nearest multiple of tick size
var start = axis.tickSize * Math.ceil(axis.min / axis.tickSize);
// then spew out all possible ticks
for (i = 0; start + i * axis.tickSize <= axis.max; ++i) {
v = start + i * axis.tickSize;
// round (this is always needed to fix numerical instability)
var decimals = axisOptions.tickDecimals;
if (decimals == null)
decimals = 1 - Math.floor(Math.log(axis.tickSize) / Math.LN10);
if (decimals < 0)
decimals = 0;
v = v.toFixed(decimals);
axis.ticks.push({ v: v, label: axisOptions.tickFormatter(v) });
}
}
}
function calculateSpacing() {
// calculate spacing for labels, using the heuristic
// that the longest string is probably the one that takes
// up the most space
var i, max_label = "";
for (i = 0; i < yaxis.ticks.length; ++i) {
var l = yaxis.ticks[i].label.length;
if (l > max_label.length)
max_label = yaxis.ticks[i].label;
}
// measure it
var dummyDiv = $('
' + max_label + '
').appendTo(target);
labelMaxWidth = dummyDiv.width();
labelMaxHeight = dummyDiv.height();
dummyDiv.remove();
var maxOutset = 2; // grid outline line width
if (options.points.show)
maxOutset = Math.max(maxOutset, options.points.radius + options.points.lineWidth/2);
for (i = 0; i < series.length; ++i) {
if (series[i].points.show)
maxOutset = Math.max(maxOutset, series[i].points.radius + series[i].points.lineWidth/2);
}
plotOffset.left = plotOffset.right = plotOffset.top = plotOffset.bottom = maxOutset;
plotOffset.left += labelMaxWidth + options.grid.labelMargin;
plotOffset.bottom += labelMaxHeight + options.grid.labelMargin;
plotWidth = canvasWidth - plotOffset.left - plotOffset.right;
plotHeight = canvasHeight - plotOffset.bottom - plotOffset.top;
hozScale = plotWidth / (xaxis.max - xaxis.min);
vertScale = plotHeight / (yaxis.max - yaxis.min);
}
function draw() {
drawGrid();
drawLabels();
for (var i = 0; i < series.length; i++) {
drawSeries(series[i]);
}
}
function tHoz(x) {
return (x - xaxis.min) * hozScale;
}
function tVert(y) {
return plotHeight - (y - yaxis.min) * vertScale;
}
function drawGrid() {
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
// draw background, if any
if (options.grid.backgroundColor != null) {
ctx.fillStyle = options.grid.backgroundColor;
ctx.fillRect(0, 0, plotWidth, plotHeight);
}
// draw the inner grid
ctx.lineWidth = 1;
ctx.strokeStyle = options.grid.tickColor;
ctx.beginPath();
var i, v;
for (i = 0; i < xaxis.ticks.length; ++i) {
v = xaxis.ticks[i].v;
if (v == xaxis.min || v == xaxis.max)
continue; // skip those lying on the axes
ctx.moveTo(Math.floor(tHoz(v)) + ctx.lineWidth/2, 0);
ctx.lineTo(Math.floor(tHoz(v)) + ctx.lineWidth/2, plotHeight);
}
for (i = 0; i < yaxis.ticks.length; ++i) {
v = yaxis.ticks[i].v;
if (v == yaxis.min || v == yaxis.max)
continue;
ctx.moveTo(0, Math.floor(tVert(v)) + ctx.lineWidth/2);
ctx.lineTo(plotWidth, Math.floor(tVert(v)) + ctx.lineWidth/2);
}
ctx.stroke();
// draw outline
ctx.lineWidth = 2;
ctx.strokeStyle = options.grid.color;
ctx.lineJoin = "round";
ctx.strokeRect(0, 0, plotWidth, plotHeight);
ctx.restore();
}
function drawLabels() {
var i;
var tick;
var html = '';
// calculate width for labels; to avoid measuring the
// widths of the labels, we construct fixed-size boxes and
// put the labels inside them, the fixed-size boxes are
// easy to mid-align
var noLabels = 0;
for (i = 0; i < xaxis.ticks.length; ++i) {
if (xaxis.ticks[i].label) {
++noLabels;
}
}
var xBoxWidth = plotWidth / noLabels;
// do the x-axis
for (i = 0; i < xaxis.ticks.length; ++i) {
tick = xaxis.ticks[i];
if (!tick.label)
continue;
html += '
' + tick.label + "
";
}
// do the y-axis
for (i = 0; i < yaxis.ticks.length; ++i) {
tick = yaxis.ticks[i];
if (!tick.label || tick.label.length == 0)
continue;
html += '
' + tick.label + "
";
}
html += '
';
target.append(html);
}
function fillInSeriesOptions() {
var i;
// collect what we already got of colors
var neededColors = series.length;
var usedColors = [];
var assignedColors = [];
for (i = 0; i < series.length; ++i) {
var sc = series[i].color;
if (sc != null) {
--neededColors;
if (typeof(sc) == "number")
assignedColors.push(sc);
else
usedColors.push(parseColor(series[i].color));
}
}
// we might need to generate more colors if higher indices
// are assigned
for (i = 0; i < assignedColors.length; ++i) {
neededColors = Math.max(neededColors, assignedColors[i] + 1);
}
// produce colors as needed
var colors = [];
var variation = 0;
i = 0;
while (colors.length < neededColors) {
var c;
if (options.colors.length == i) // check degenerate case
c = new Color(100, 100, 100);
else
c = parseColor(options.colors[i]);
// vary color if needed
var sign = variation % 2 == 1 ? -1 : 1;
var factor = 1 + sign * Math.ceil(variation / 2) * 0.2;
c.scale(factor, factor, factor);
// FIXME: if we're getting to close to something else,
// we should probably skip this one
colors.push(c);
++i;
if (i >= options.colors.length) {
i = 0;
++variation;
}
}
// fill in the options
var colori = 0;
for (i = 0; i < series.length; ++i) {
var s = series[i];
// assign colors
if (s.color == null) {
s.color = colors[colori].toString();
++colori;
}
else if (typeof(s.color) == "number")
s.color = colors[s.color].toString();
// copy the rest
s.lines = $.extend(true, {}, options.lines, s.lines);
s.points = $.extend(true, {}, options.points, s.points);
s.bars = $.extend(true, {}, options.bars, s.bars);
if (s.shadowSize == null)
s.shadowSize = options.shadowSize;
}
}
function drawSeries(series) {
if (series.lines.show || (!series.bars.show && !series.points.show))
drawSeriesLines(series);
if (series.bars.show)
drawSeriesBars(series);
if (series.points.show)
drawSeriesPoints(series);
}
function drawSeriesLines(series) {
function plotLine(data, offset) {
if (data.length < 2)
return;
var prevx = tHoz(data[0][0]),
prevy = tVert(data[0][1]) + offset;
ctx.beginPath();
ctx.moveTo(prevx, prevy);
for (var i = 0; i < data.length - 1; ++i) {
var x1 = data[i][0], y1 = data[i][1],
x2 = data[i+1][0], y2 = data[i+1][1];
// clip with ymin
if (y1 <= y2 && y1 < yaxis.min) {
if (y2 < yaxis.min)
continue; // line segment is outside
// compute new intersection point
x1 = (yaxis.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = yaxis.min;
}
else if (y2 <= y1 && y2 < yaxis.min) {
if (y1 < yaxis.min)
continue;
x2 = (yaxis.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = yaxis.min;
}
// clip with ymax
if (y1 >= y2 && y1 > yaxis.max) {
if (y2 > yaxis.max)
continue;
x1 = (yaxis.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = yaxis.max;
}
else if (y2 >= y1 && y2 > yaxis.max) {
if (y1 > yaxis.max)
continue;
x2 = (yaxis.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = yaxis.max;
}
// clip with xmin
if (x1 <= x2 && x1 < xaxis.min) {
if (x2 < xaxis.min)
continue;
y1 = (xaxis.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = xaxis.min;
}
else if (x2 <= x1 && x2 < xaxis.min) {
if (x1 < xaxis.min)
continue;
y2 = (xaxis.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = xaxis.min;
}
// clip with xmax
if (x1 >= x2 && x1 > xaxis.max) {
if (x2 > xaxis.max)
continue;
y1 = (xaxis.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = xaxis.max;
}
else if (x2 >= x1 && x2 > xaxis.max) {
if (x1 > xaxis.max)
continue;
y2 = (xaxis.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = xaxis.max;
}
if (prevx != tHoz(x1) || prevy != tVert(y1) + offset)
ctx.moveTo(tHoz(x1), tVert(y1) + offset);
prevx = tHoz(x2);
prevy = tVert(y2) + offset;
ctx.lineTo(prevx, prevy);
}
ctx.stroke();
}
function plotLineArea(data) {
if (data.length < 2)
return;
var bottom = Math.min(Math.max(0, yaxis.min), yaxis.max);
var top, lastX = 0;
var first = true;
ctx.beginPath();
for (var i = 0; i < data.length - 1; ++i) {
var x1 = data[i][0], y1 = data[i][1],
x2 = data[i+1][0], y2 = data[i+1][1];
// clip x values
// clip with xmin
if (x1 <= x2 && x1 < xaxis.min) {
if (x2 < xaxis.min)
continue;
y1 = (xaxis.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = xaxis.min;
}
else if (x2 <= x1 && x2 < xaxis.min) {
if (x1 < xaxis.min)
continue;
y2 = (xaxis.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = xaxis.min;
}
// clip with xmax
if (x1 >= x2 && x1 > xaxis.max) {
if (x2 > xaxis.max)
continue;
y1 = (xaxis.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = xaxis.max;
}
else if (x2 >= x1 && x2 > xaxis.max) {
if (x1 > xaxis.max)
continue;
y2 = (xaxis.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = xaxis.max;
}
if (first) {
ctx.moveTo(tHoz(x1), tVert(bottom));
first = false;
}
// now first check the case where both is outside
if (y1 >= yaxis.max && y2 >= yaxis.max) {
ctx.lineTo(tHoz(x1), tVert(yaxis.max));
ctx.lineTo(tHoz(x2), tVert(yaxis.max));
continue;
}
else if (y1 <= yaxis.min && y2 <= yaxis.min) {
ctx.lineTo(tHoz(x1), tVert(yaxis.min));
ctx.lineTo(tHoz(x2), tVert(yaxis.min));
continue;
}
// else it's a bit more complicated, there might
// be two rectangles and two triangles we need to fill
// in; to find these keep track of the current x values
var x1old = x1, x2old = x2;
// and clip the y values, without shortcutting
// clip with ymin
if (y1 <= y2 && y1 < yaxis.min && y2 >= yaxis.min) {
x1 = (yaxis.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = yaxis.min;
}
else if (y2 <= y1 && y2 < yaxis.min && y1 >= yaxis.min) {
x2 = (yaxis.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = yaxis.min;
}
// clip with ymax
if (y1 >= y2 && y1 > yaxis.max && y2 <= yaxis.max) {
x1 = (yaxis.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = yaxis.max;
}
else if (y2 >= y1 && y2 > yaxis.max && y1 <= yaxis.max) {
x2 = (yaxis.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = yaxis.max;
}
// if the x value was changed we got a rectangle
// to fill
if (x1 != x1old) {
if (y1 <= yaxis.min)
top = yaxis.min;
else
top = yaxis.max;
ctx.lineTo(tHoz(x1old), tVert(top));
ctx.lineTo(tHoz(x1), tVert(top));
}
// fill the triangles
ctx.lineTo(tHoz(x1), tVert(y1));
ctx.lineTo(tHoz(x2), tVert(y2));
// fill the other rectangle if it's there
if (x2 != x2old) {
if (y2 <= yaxis.min)
top = yaxis.min;
else
top = yaxis.max;
ctx.lineTo(tHoz(x2old), tVert(top));
ctx.lineTo(tHoz(x2), tVert(top));
}
lastX = Math.max(x2, x2old);
}
/*
ctx.beginPath();
ctx.moveTo(tHoz(data[0][0]), tVert(0));
for (var i = 0; i < data.length; i++) {
ctx.lineTo(tHoz(data[i][0]), tVert(data[i][1]));
}
ctx.lineTo(tHoz(data[data.length - 1][0]), tVert(0));*/
ctx.lineTo(tHoz(lastX), tVert(bottom));
ctx.fill();
}
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
ctx.lineJoin = "round";
var lw = series.lines.lineWidth;
var sw = series.shadowSize;
// FIXME: consider another form of shadow when filling is turned on
if (sw > 0) {
// draw shadow in two steps
ctx.lineWidth = sw / 2;
ctx.strokeStyle = "rgba(0,0,0,0.1)";
plotLine(series.data, lw/2 + sw/2 + ctx.lineWidth/2);
ctx.lineWidth = sw / 2;
ctx.strokeStyle = "rgba(0,0,0,0.2)";
plotLine(series.data, lw/2 + ctx.lineWidth/2);
}
ctx.lineWidth = lw;
ctx.strokeStyle = series.color;
if (series.lines.fill) {
ctx.fillStyle = series.lines.fillColor != null ? series.lines.fillColor : parseColor(series.color).scale(null, null, null, 0.4).toString();
plotLineArea(series.data, 0);
}
plotLine(series.data, 0);
ctx.restore();
}
function drawSeriesPoints(series) {
function plotPoints(data, radius, fill) {
for (var i = 0; i < data.length; ++i) {
var x = data[i][0], y = data[i][1];
if (x < xaxis.min || x > xaxis.max || y < yaxis.min || y > yaxis.max)
continue;
ctx.beginPath();
ctx.arc(tHoz(x), tVert(y), radius, 0, 2 * Math.PI, true);
if (fill)
ctx.fill();
ctx.stroke();
}
}
function plotPointShadows(data, offset, radius) {
for (var i = 0; i < data.length; ++i) {
var x = data[i][0], y = data[i][1];
if (x < xaxis.min || x > xaxis.max || y < yaxis.min || y > yaxis.max)
continue;
ctx.beginPath();
ctx.arc(tHoz(x), tVert(y) + offset, radius, 0, Math.PI, false);
ctx.stroke();
}
}
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
var lw = series.lines.lineWidth;
var sw = series.shadowSize;
if (sw > 0) {
// draw shadow in two steps
ctx.lineWidth = sw / 2;
ctx.strokeStyle = "rgba(0,0,0,0.1)";
plotPointShadows(series.data, sw/2 + ctx.lineWidth/2, series.points.radius);
ctx.lineWidth = sw / 2;
ctx.strokeStyle = "rgba(0,0,0,0.2)";
plotPointShadows(series.data, ctx.lineWidth/2, series.points.radius);
}
ctx.lineWidth = series.points.lineWidth;
ctx.strokeStyle = series.color;
ctx.fillStyle = series.points.fillColor != null ? series.points.fillColor : series.color;
plotPoints(series.data, series.points.radius, series.points.fill);
ctx.restore();
}
function drawSeriesBars(series) {
function plotBars(data, barWidth, offset, fill) {
if (data.length < 2)
return;
for (var i = 0; i < data.length; i++) {
var x = data[i][0], y = data[i][1];
var drawLeft = true, drawTop = true, drawRight = true;
var left = x, right = x + barWidth, bottom = 0, top = y;
if (right < xaxis.min || left > xaxis.max || top < yaxis.min || bottom > yaxis.max)
continue;
// clip
if (left < xaxis.min) {
left = xaxis.min;
drawLeft = false;
}
if (right > xaxis.max) {
right = xaxis.max;
drawRight = false;
}
if (bottom < yaxis.min)
bottom = yaxis.min;
if (top > yaxis.max) {
top = yaxis.max;
drawTop = false;
}
// fill the bar
if (fill) {
ctx.beginPath();
ctx.moveTo(tHoz(left), tVert(bottom) + offset);
ctx.lineTo(tHoz(left), tVert(top) + offset);
ctx.lineTo(tHoz(right), tVert(top) + offset);
ctx.lineTo(tHoz(right), tVert(bottom) + offset);
ctx.fill();
}
// draw outline
if (drawLeft || drawRight || drawTop) {
ctx.beginPath();
ctx.moveTo(tHoz(left), tVert(bottom) + offset);
if (drawLeft)
ctx.lineTo(tHoz(left), tVert(top) + offset);
else
ctx.moveTo(tHoz(left), tVert(top) + offset);
if (drawTop)
ctx.lineTo(tHoz(right), tVert(top) + offset);
else
ctx.moveTo(tHoz(right), tVert(top) + offset);
if (drawRight)
ctx.lineTo(tHoz(right), tVert(bottom) + offset);
else
ctx.moveTo(tHoz(right), tVert(bottom) + offset);
ctx.stroke();
}
}
}
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
ctx.lineJoin = "round";
var bw = series.bars.barWidth;
var lw = Math.min(series.bars.lineWidth, bw);
// FIXME: figure out a way to add shadows
/*
var sw = series.shadowSize;
if (sw > 0) {
// draw shadow in two steps
ctx.lineWidth = sw / 2;
ctx.strokeStyle = "rgba(0,0,0,0.1)";
plotBars(series.data, bw, lw/2 + sw/2 + ctx.lineWidth/2, false);
ctx.lineWidth = sw / 2;
ctx.strokeStyle = "rgba(0,0,0,0.2)";
plotBars(series.data, bw, lw/2 + ctx.lineWidth/2, false);
}*/
ctx.lineWidth = lw;
ctx.strokeStyle = series.color;
if (series.bars.fill) {
ctx.fillStyle = series.bars.fillColor != null ? series.bars.fillColor : parseColor(series.color).scale(null, null, null, 0.4).toString();
}
plotBars(series.data, bw, 0, series.bars.fill);
ctx.restore();
}
function insertLegend() {
if (!options.legend.show)
return;
var fragments = [];
var rowStarted = false;
for (i = 0; i < series.length; ++i) {
if (!series[i].label)
continue;
if (i % options.legend.noColumns == 0) {
if (rowStarted)
fragments.push('');
fragments.push('');
rowStarted = true;
}
var label = series[i].label;
if (options.legend.labelFormatter != null)
label = options.legend.labelFormatter(label);
fragments.push(
' | ' +
'' + label + ' | ');
}
if (rowStarted)
fragments.push('
');
if (fragments.length > 0) {
var table = '' + fragments.join("") + '
';
if (options.legend.container != null)
options.legend.container.append(table);
else {
var pos = "";
var p = options.legend.position, m = options.legend.margin;
if (p.charAt(0) == "n")
pos += 'top:' + (m + plotOffset.top) + 'px;';
else if (p.charAt(0) == "s")
pos += 'bottom:' + (m + plotOffset.bottom) + 'px;';
if (p.charAt(1) == "e")
pos += 'right:' + (m + plotOffset.right) + 'px;';
else if (p.charAt(1) == "w")
pos += 'left:' + (m + plotOffset.bottom) + 'px;';
var div = $('' + table + '
').appendTo(target);
if (options.legend.backgroundOpacity != 0.0) {
// put in the transparent background
// separately to avoid blended labels and
// label boxes
var c = options.legend.backgroundColor;
if (c == null) {
var tmp;
if (options.grid.backgroundColor != null)
tmp = options.grid.backgroundColor;
else
tmp = extractColor(div);
c = parseColor(tmp).adjust(null, null, null, 1).toString();
}
$('
').appendTo(target).css('opacity', options.legend.backgroundOpacity);
}
}
}
}
var lastMousePos = { pageX: null, pageY: null };
var selection = { first: { x: -1, y: -1}, second: { x: -1, y: -1} };
var prevSelection = null;
var selectionInterval = null;
function onMouseMove(ev) {
// FIXME: temp. work-around until jQuery bug 1871 is fixed
var e = ev || window.event;
if (e.pageX == null && e.clientX != null) {
var de = document.documentElement, b = document.body;
lastMousePos.pageX = e.clientX + (de && de.scrollLeft || b.scrollLeft || 0);
lastMousePos.pageY = e.clientY + (de && de.scrollTop || b.scrollTop || 0);
}
else {
lastMousePos.pageX = e.pageX;
lastMousePos.pageY = e.pageY;
}
}
function onMouseDown(e) {
if (e.which != 1) // only accept left-click
return;
setSelectionPos(selection.first, e);
if (selectionInterval != null)
clearInterval(selectionInterval);
lastMousePos.pageX = null;
selectionInterval = setInterval(updateSelectionOnMouseMove, 200);
$(document).one("mouseup", onSelectionMouseUp);
}
function triggerSelectedEvent() {
var x1, x2, y1, y2;
if (selection.first.x <= selection.second.x) {
x1 = selection.first.x;
x2 = selection.second.x;
}
else {
x1 = selection.second.x;
x2 = selection.first.x;
}
if (selection.first.y >= selection.second.y) {
y1 = selection.first.y;
y2 = selection.second.y;
}
else {
y1 = selection.second.y;
y2 = selection.first.y;
}
x1 = xaxis.min + x1 / hozScale;
x2 = xaxis.min + x2 / hozScale;
y1 = yaxis.max - y1 / vertScale;
y2 = yaxis.max - y2 / vertScale;
target.trigger("selected", [ { x1: x1, y1: y1, x2: x2, y2: y2 } ]);
}
function onSelectionMouseUp(e) {
if (selectionInterval != null) {
clearInterval(selectionInterval);
selectionInterval = null;
}
setSelectionPos(selection.second, e);
clearSelection();
if (!selectionIsSane() || e.which != 1)
return false;
drawSelection();
triggerSelectedEvent();
return false;
}
function setSelectionPos(pos, e) {
var offset = $(overlay).offset();
if (options.selection.mode == "y") {
if (pos == selection.first)
pos.x = 0;
else
pos.x = plotWidth;
}
else {
pos.x = e.pageX - offset.left - plotOffset.left;
pos.x = Math.min(Math.max(0, pos.x), plotWidth);
}
if (options.selection.mode == "x") {
if (pos == selection.first)
pos.y = 0;
else
pos.y = plotHeight;
}
else {
pos.y = e.pageY - offset.top - plotOffset.top;
pos.y = Math.min(Math.max(0, pos.y), plotHeight);
}
}
function updateSelectionOnMouseMove() {
if (lastMousePos.pageX == null)
return;
setSelectionPos(selection.second, lastMousePos);
clearSelection();
if (selectionIsSane())
drawSelection();
}
function clearSelection() {
if (prevSelection == null)
return;
var x = Math.min(prevSelection.first.x, prevSelection.second.x),
y = Math.min(prevSelection.first.y, prevSelection.second.y),
w = Math.abs(prevSelection.second.x - prevSelection.first.x),
h = Math.abs(prevSelection.second.y - prevSelection.first.y);
octx.clearRect(x + plotOffset.left - octx.lineWidth,
y + plotOffset.top - octx.lineWidth,
w + octx.lineWidth*2,
h + octx.lineWidth*2);
prevSelection = null;
}
function setSelection(area) {
clearSelection();
if (options.selection.mode == "x") {
selection.first.y = 0;
selection.second.y = plotHeight;
}
else {
selection.first.y = (yaxis.max - area.y1) * vertScale;
selection.second.y = (yaxis.max - area.y2) * vertScale;
}
if (options.selection.mode == "y") {
selection.first.x = 0;
selection.second.x = plotWidth;
}
else {
selection.first.x = (area.x1 - xaxis.min) * hozScale;
selection.second.x = (area.x2 - xaxis.min) * hozScale;
}
drawSelection();
triggerSelectedEvent();
}
function drawSelection() {
if (prevSelection != null &&
selection.first.x == prevSelection.first.x &&
selection.first.y == prevSelection.first.y &&
selection.second.x == prevSelection.second.x &&
selection.second.y == prevSelection.second.y)
return;
octx.strokeStyle = parseColor(options.selection.color).scale(null, null, null, 0.8).toString();
octx.lineWidth = 1;
ctx.lineJoin = "round";
octx.fillStyle = parseColor(options.selection.color).scale(null, null, null, 0.4).toString();
prevSelection = { first: { x: selection.first.x,
y: selection.first.y },
second: { x: selection.second.x,
y: selection.second.y } };
var x = Math.min(selection.first.x, selection.second.x),
y = Math.min(selection.first.y, selection.second.y),
w = Math.abs(selection.second.x - selection.first.x),
h = Math.abs(selection.second.y - selection.first.y);
octx.fillRect(x + plotOffset.left, y + plotOffset.top, w, h);
octx.strokeRect(x + plotOffset.left, y + plotOffset.top, w, h);
}
function selectionIsSane() {
var minSize = 5;
return Math.abs(selection.second.x - selection.first.x) >= minSize &&
Math.abs(selection.second.y - selection.first.y) >= minSize;
}
}
$.plot = function(target, data, options) {
var plot = new Plot(target, data, options);
/*var t0 = new Date();
var t1 = new Date();
var tstr = "time used (msecs): " + (t1.getTime() - t0.getTime())
if (window.console)
console.log(tstr);
else
alert(tstr);*/
return plot;
};
function getMagnitude(x) {
return Math.pow(10, Math.floor(Math.log(x) / Math.LN10));
}
// color helpers, inspiration from the jquery color animation
// plugin by John Resig
function Color (r, g, b, a) {
var rgba = ['r','g','b','a'];
var x = 4; //rgba.length
while (-1<--x) {
this[rgba[x]] = arguments[x] || ((x==3) ? 1.0 : 0);
}
this.toString = function() {
if (this.a >= 1.0) {
return "rgb("+[this.r,this.g,this.b].join(",")+")";
} else {
return "rgba("+[this.r,this.g,this.b,this.a].join(",")+")";
}
};
this.scale = function(rf, gf, bf, af) {
x = 4; //rgba.length
while (-1<--x) {
if (arguments[x] != null)
this[rgba[x]] *= arguments[x];
}
return this.normalize();
};
this.adjust = function(rd, gd, bd, ad) {
x = 4; //rgba.length
while (-1<--x) {
if (arguments[x] != null)
this[rgba[x]] += arguments[x];
}
return this.normalize();
};
this.clone = function() {
return new Color(this.r, this.b, this.g, this.a);
};
var limit = function(val,minVal,maxVal) {
return Math.max(Math.min(val, maxVal), minVal);
};
this.normalize = function() {
this.r = limit(parseInt(this.r), 0, 255);
this.g = limit(parseInt(this.g), 0, 255);
this.b = limit(parseInt(this.b), 0, 255);
this.a = limit(this.a, 0, 1);
return this;
};
this.normalize();
}
var lookupColors = {
aqua:[0,255,255],
azure:[240,255,255],
beige:[245,245,220],
black:[0,0,0],
blue:[0,0,255],
brown:[165,42,42],
cyan:[0,255,255],
darkblue:[0,0,139],
darkcyan:[0,139,139],
darkgrey:[169,169,169],
darkgreen:[0,100,0],
darkkhaki:[189,183,107],
darkmagenta:[139,0,139],
darkolivegreen:[85,107,47],
darkorange:[255,140,0],
darkorchid:[153,50,204],
darkred:[139,0,0],
darksalmon:[233,150,122],
darkviolet:[148,0,211],
fuchsia:[255,0,255],
gold:[255,215,0],
green:[0,128,0],
indigo:[75,0,130],
khaki:[240,230,140],
lightblue:[173,216,230],
lightcyan:[224,255,255],
lightgreen:[144,238,144],
lightgrey:[211,211,211],
lightpink:[255,182,193],
lightyellow:[255,255,224],
lime:[0,255,0],
magenta:[255,0,255],
maroon:[128,0,0],
navy:[0,0,128],
olive:[128,128,0],
orange:[255,165,0],
pink:[255,192,203],
purple:[128,0,128],
violet:[128,0,128],
red:[255,0,0],
silver:[192,192,192],
white:[255,255,255],
yellow:[255,255,0]
};
function extractColor(element) {
var color, elem = element;
do {
color = elem.css("background-color").toLowerCase();
// keep going until we find an element that has color, or
// we hit the body
if (color != '' && color != 'transparent')
break;
elem = elem.parent();
} while (!$.nodeName(elem.get(0), "body"));
// catch Safari's way of signalling transparent
if (color == "rgba(0, 0, 0, 0)")
return "transparent";
return color;
}
// parse string, returns Color
function parseColor(str) {
// Some named colors to work with
// From Interface by Stefan Petre
// http://interface.eyecon.ro/
var result;
// Look for rgb(num,num,num)
if (result = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(str))
return new Color(parseInt(result[1]), parseInt(result[2]), parseInt(result[3]));
// Look for rgba(num,num,num,num)
if (result = /rgba\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(str))
return new Color(parseInt(result[1]), parseInt(result[2]), parseInt(result[3]), parseFloat(result[4]));
// Look for rgb(num%,num%,num%)
if (result = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(str))
return new Color(parseFloat(result[1])*2.55, parseFloat(result[2])*2.55, parseFloat(result[3])*2.55);
// Look for rgba(num%,num%,num%,num)
if (result = /rgba\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(str))
return new Color(parseFloat(result[1])*2.55, parseFloat(result[2])*2.55, parseFloat(result[3])*2.55, parseFloat(result[4]));
// Look for #a0b1c2
if (result = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(str))
return new Color(parseInt(result[1],16), parseInt(result[2],16), parseInt(result[3],16));
// Look for #fff
if (result = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(str))
return new Color(parseInt(result[1]+result[1],16), parseInt(result[2]+result[2],16), parseInt(result[3]+result[3],16));
// Otherwise, we're most likely dealing with a named color
var name = jQuery.trim(str).toLowerCase();
if (name == "transparent")
return new Color(255, 255, 255, 0);
else {
result = lookupColors[name];
return new Color(result[0], result[1], result[2]);
}
}
})(jQuery);