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/* The MIT License
Copyright (c) 2011 by Michael Zinsmaier and nergal.dev
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
/*
____________________________________________________
what it is:
____________________________________________________
curvedLines is a plugin for flot, that tries to display lines in a smoother way.
The plugin is based on nergal.dev's work https://code.google.com/p/flot/issues/detail?id=226
and further extended with a mode that forces the min/max points of the curves to be on the
points. Both modes are achieved through adding of more data points
=> 1) with large data sets you may get trouble
=> 2) if you want to display the points too, you have to plot them as 2nd data series over the lines
This is version 0.1 of curvedLines so it will probably not work in every case. However
the basic form of use descirbed next works (:
Feel free to further improve the code
____________________________________________________
how to use it:
____________________________________________________
var d1 = [[5,5],[7,3],[9,12]];
var options = { series: { curvedLines: { active: true }}};
$.plot($("#placeholder"), [{data = d1, curvedLines: { show: true}}], options);
_____________________________________________________
options:
_____________________________________________________
fill: bool true => lines get filled
fillColor: null or the color that should be used for filling
active: bool true => plugin can be used
show: bool true => series will be drawn as curved line
fit: bool true => forces the max,mins of the curve to be on the datapoints
lineWidth: int width of the line
curvePointFactor int defines how many "virtual" points are used per "real" data point to
emulate the curvedLines
fitPointDist: int defines the x axis distance of the additional two points that are used
to enforce the min max condition. (you will get curvePointFactor * 3 * |datapoints|
"virtual" points if fit is true)
*/
/*
* v0.1 initial commit
* v0.15 negative values should work now (outcommented a negative -> 0 hook hope it does no harm)
* v0.2 added fill option (thanks to monemihir) and multi axis support (thanks to soewono effendi)
*
*
*/
(function ($) {
var options = { series: { curvedLines: { active: false,
show: false,
fit: false,
fill: false,
fillColor: null,
lineWidth: 2,
curvePointFactor: 20,
fitPointDist: 0.0001
}}};
function init(plot) {
plot.hooks.processOptions.push(processOptions);
//if the plugin is active register draw method
function processOptions(plot,options) {
if (options.series.curvedLines.active) {
plot.hooks.draw.push(draw);
}
}
//select the data sets that should be drawn with curved lines and draws them
function draw(plot, ctx) {
var series;
var sdata = plot.getData();
var offset = plot.getPlotOffset();
for (var i = 0; i < sdata.length; i++) {
series = sdata[i];
if (series.curvedLines.show && series.curvedLines.lineWidth > 0) {
axisx = series.xaxis;
axisy = series.yaxis;
ctx.save();
ctx.translate(offset.left, offset.top);
ctx.lineJoin = "round";
ctx.strokeStyle = series.color;
if(series.curvedLines.fill) {
var fillColor = series.curvedLines.fillColor == null ? series.color : series.curvedLines.fillColor;
var c = $.color.parse(fillColor);
c.a = typeof fill == "number" ? fill : 0.4;
c.normalize();
ctx.fillStyle = c.toString();
}
ctx.lineWidth = series.curvedLines.lineWidth;
var points = calculateCurvePoints(series.data, series.curvedLines);
plotLine(ctx, points, axisx, axisy, series.curvedLines.fill);
ctx.restore();
}
}
}
//nearly the same as in the core library
//only ps is adjusted to 2
function plotLine(ctx, points, axisx, axisy, fill) {
var ps = 2;
var prevx = null;
var prevy = null;
var firsty = 0;
ctx.beginPath();
for (var i = ps; i < points.length; i += ps) {
var x1 = points[i - ps], y1 = points[i - ps + 1];
var x2 = points[i], y2 = points[i + 1];
if (x1 == null || x2 == null)
continue;
// clip with ymin
if (y1 <= y2 && y1 < axisy.min) {
if (y2 < axisy.min)
continue; // line segment is outside
// compute new intersection point
x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = axisy.min;
}
else if (y2 <= y1 && y2 < axisy.min) {
if (y1 < axisy.min)
continue;
x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = axisy.min;
}
// clip with ymax
if (y1 >= y2 && y1 > axisy.max) {
if (y2 > axisy.max)
continue;
x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = axisy.max;
}
else if (y2 >= y1 && y2 > axisy.max) {
if (y1 > axisy.max)
continue;
x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = axisy.max;
}
// clip with xmin
if (x1 <= x2 && x1 < axisx.min) {
if (x2 < axisx.min)
continue;
y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = axisx.min;
}
else if (x2 <= x1 && x2 < axisx.min) {
if (x1 < axisx.min)
continue;
y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = axisx.min;
}
// clip with xmax
if (x1 >= x2 && x1 > axisx.max) {
if (x2 > axisx.max)
continue;
y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = axisx.max;
}
else if (x2 >= x1 && x2 > axisx.max) {
if (x1 > axisx.max)
continue;
y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = axisx.max;
}
if (x1 != prevx || y1 != prevy)
ctx.lineTo(axisx.p2c(x1), axisy.p2c(y1));
if (prevx == null) {
firsty = y2;
}
prevx = x2;
prevy = y2;
ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));
}
if (fill) {
ctx.lineTo(axisx.p2c(axisx.max), axisy.p2c(axisy.min));
ctx.lineTo(axisx.p2c(axisx.min), axisy.p2c(axisy.min));
ctx.lineTo(axisx.p2c(axisx.min), axisy.p2c(firsty));
ctx.fill();
}
ctx.stroke();
}
//no real idea whats going on here code mainly from https://code.google.com/p/flot/issues/detail?id=226
//I don't understand what nergal computes here and to be honest I didn't even try
function calculateCurvePoints(data, curvedLinesOptions) {
var num = curvedLinesOptions.curvePointFactor * data.length;
var xdata = new Array;
var ydata = new Array;
if (curvedLinesOptions.fit) {
//insert a point before and after the "real" data point to force the line
//to have a max,min at the data point
var neigh = curvedLinesOptions.fitPointDist;
var j=0;
for(var i = 0; i < data.length; i++) {
//smooth front
xdata[j] = data[i][0]-0.1;
if (i > 0) {
ydata[j] = data[i-1][1]*neigh + data[i][1] * (1 - neigh);
} else {
ydata[j] = data[i][1];
}
j++;
xdata[j] = data[i][0];
ydata[j] = data[i][1];
j++;
//smooth back
xdata[j] = data[i][0]+0.1;
if ((i+1) < data.length) {
ydata[j] = data[i+1][1]*neigh + data[i][1] * (1 - neigh);
} else {
ydata[j] = data[i][1];
}
j++;
}
} else {
//just use the datapoints
for(var i = 0; i < data.length; i++) {
xdata[i] = data[i][0];
ydata[i] = data[i][1];
}
}
var n = xdata.length;
var y2 = new Array();
var delta = new Array();
y2[0] = 0;
y2[n - 1] = 0;
delta[0] = 0;
for(var i = 1; i < n - 1; ++i) {
var d = (xdata[i + 1] - xdata[i - 1]);
if(d == 0) {
return null;
}
var s = (xdata[i] - xdata[i - 1]) / d;
var p = s * y2[i - 1] + 2;
y2[i] = (s - 1) / p;
delta[i] = (ydata[i + 1] - ydata[i]) / (xdata[i + 1] - xdata[i]) - (ydata[i] - ydata[i - 1]) / (xdata[i] - xdata[i - 1]);
delta[i] = (6 * delta[i] / (xdata[i + 1] - xdata[i - 1]) - s * delta[i - 1]) / p;
}
for(var j = n - 2; j >= 0; --j) {
y2[j] = y2[j] * y2[j + 1] + delta[j];
}
var step = (xdata[n - 1] - xdata[0]) / (num - 1);
var xnew = new Array;
var ynew = new Array;
var result = new Array;
xnew[0] = xdata[0];
ynew[0] = ydata[0];
for(j = 1; j < num; ++j) {
xnew[j] = xnew[0] + j * step;
var max = n - 1;
var min = 0;
while(max - min > 1) {
var k = Math.round((max + min) / 2);
if(xdata[k] > xnew[j]) {
max = k;
} else {
min = k;
}
}
var h = (xdata[max] - xdata[min]);
if(h == 0) {
return null;
}
var a = (xdata[max] - xnew[j]) / h;
var b = (xnew[j] - xdata[min]) / h;
ynew[j] = a * ydata[min] + b * ydata[max] + ((a * a * a - a) * y2[min] + (b * b * b - b) * y2[max]) * (h * h) / 6;
// if (ynew[j] < 0.01){
// ynew[j] = 0;
// }
result.push(xnew[j]);
result.push(ynew[j]);
}
return result;
}
}//end init
$.plot.plugins.push({
init: init,
options: options,
name: 'curvedLines',
version: '0.2'
});
})(jQuery);
