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CurvedLines
Commit 56b37176 authored by Thomas-git's avatar Thomas-git
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Proper curves filling and require.js module 

Small bug fixes
- fill opacity always defaulted to 0
- check of Array.map
parent bef80155
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curvedLines.js
View file @ 56b37176
define(['jquery','jquery.flot'],function(jQuery,jflot){
/* The MIT License /* The MIT License
Copyright (c) 2011 by Michael Zinsmaier and nergal.dev Copyright (c) 2011 by Michael Zinsmaier and nergal.dev
Copyright (c) 2012 by Thomas Ritou
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 0.3 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
____________________________________________________ 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:
how to use it: The above copyright notice and this permission notice shall be included in
____________________________________________________ all copies or substantial portions of the Software.
var d1 = [[5,5],[7,3],[9,12]]; 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.
*/
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)
* v0.3 improved saddle handling and added basic handling of Dates
*
*/
(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) { ____________________________________________________
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 0.4 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)
* v0.3 improved saddle handling and added basic handling of Dates
* v0.4 rewritten fill option (thomas ritou) mostly from original flot code (now fill between points rather than to graph bottom), corrected fill Opacity bug
*
*/
plot.hooks.processOptions.push(processOptions); (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 //if the plugin is active register draw method
function processOptions(plot, options) { function processOptions(plot,options) {
if (options.series.curvedLines.active) { if (options.series.curvedLines.active) {
plot.hooks.draw.push(draw); plot.hooks.draw.push(draw);
} }
} }
//select the data sets that should be drawn with curved lines and draws them
function draw(plot, ctx) { //select the data sets that should be drawn with curved lines and draws them
var series; function draw(plot, ctx) {
var sdata = plot.getData(); var series;
var offset = plot.getPlotOffset(); var sdata = plot.getData();
var offset = plot.getPlotOffset();
for (var i = 0; i < sdata.length; i++) {
series = sdata[i]; for (var i = 0; i < sdata.length; i++) {
if (series.curvedLines.show && series.curvedLines.lineWidth > 0) { series = sdata[i];
if (series.curvedLines.show) {
axisx = series.xaxis;
axisy = series.yaxis; axisx = series.xaxis;
axisy = series.yaxis;
ctx.save();
ctx.translate(offset.left, offset.top); ctx.save();
ctx.lineJoin = "round"; ctx.translate(offset.left, offset.top);
ctx.strokeStyle = series.color; ctx.lineJoin = "round";
if (series.curvedLines.fill) { ctx.strokeStyle = series.color;
var fillColor = series.curvedLines.fillColor == null ? series.color : series.curvedLines.fillColor;
var c = $.color.parse(fillColor); ctx.lineWidth = series.curvedLines.lineWidth;
c.a = typeof fill == "number" ? fill : 0.4;
c.normalize();
ctx.fillStyle = c.toString(); var points,data;
} if(series.curvedLines.fill || series.curvedLines.lineWidth) {
ctx.lineWidth = series.curvedLines.lineWidth;
var points, dataX, dataY, data; //convenience check for x or y values if they are Dates if so apply .getTime()
//only check on first value mixing numeric and Date fields in one input array is not allowed
//convenience check for x or y values if they are Dates if so apply .getTime() if ('map' in Array.prototype && (series.data[0][0] instanceof Date || series.data[0][1] instanceof Date)) {
//only check on first value mixing numeric and Date fields in one input array is not allowed data = series.data.map(getTimeFromDate);
if (series.data[0][0] instanceof Date || series.data[0][1] instanceof Date) { } else {
data = series.data.map(getTimeFromDate); //default case
} else { data = series.data;
//default case }
data = series.data;
} points= calculateCurvePoints(data, series.curvedLines,1);
}
var points = calculateCurvePoints(data, series.curvedLines); if(series.curvedLines.fill) {
plotLine(ctx, points, axisx, axisy, series.curvedLines.fill); var fillColor = series.curvedLines.fillColor == null ? series.color : series.curvedLines.fillColor;
ctx.restore(); var c = $.color.parse(fillColor);
} c.a = typeof series.curvedLines.fill == "number" ? series.curvedLines.fill : 0.4;
} c.normalize();
} ctx.fillStyle = c.toString();
//Make sure we've got a second y point for filling area
//helper method that convertes Dates to a numeric representation for (var j=0;j<data.length;j++){
if (data[j].length==2) data[j][2]=0;
}
var pointsFill = calculateCurvePoints(data, series.curvedLines,2);
plotLineArea(ctx,points,pointsFill,axisx,axisy);
}
if (series.curvedLines.lineWidth>0)
plotLine(ctx, points, axisx, axisy,2);
ctx.restore();
}
}
}
//helper method that convertes Dates to a numeric representation
function getTimeFromDate(timeElement) { function getTimeFromDate(timeElement) {
var xVal = timeElement[0]; var xVal = timeElement[0];
var yVal = timeElement[1]; var yVal = timeElement[1];
...@@ -166,248 +190,397 @@ ...@@ -166,248 +190,397 @@
return ret; return ret;
} }
//nearly the same as in the core library function plotLineArea(ctx,points2,points3, axisx, axisy) {
//only ps is adjusted to 2 var points = points2,
function plotLine(ctx, points, axisx, axisy, fill) { ps = 2,
bottom = Math.min(Math.max(0, axisy.min), axisy.max),
var ps = 2; i = 0, top, areaOpen = false,
var prevx = null; ypos = 1, segmentStart = 0, segmentEnd = 0;
var prevy = null;
var firsty = 0; // we process each segment in two turns, first forward
// direction to sketch out top, then once we hit the
ctx.beginPath(); // end we go backwards to sketch the bottom
while (true) {
for (var i = ps; i < points.length; i += ps) { if (ps > 0 && i > points.length + ps)
var x1 = points[i - ps], y1 = points[i - ps + 1]; break;
var x2 = points[i], y2 = points[i + 1];
i += ps; // ps is negative if going backwards
if (x1 == null || x2 == null)
continue; var x1 = points[i - ps],
y1 = points[i - ps + ypos],
// clip with ymin x2 = points[i], y2 = points[i + ypos];
if (y1 <= y2 && y1 < axisy.min) {
if (y2 < axisy.min) if (areaOpen) {
continue; if (ps > 0 && x1 != null && x2 == null) {
// line segment is outside // at turning point
// compute new intersection point segmentEnd = i;
x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1; ps = -ps;
y1 = axisy.min; ypos = 1;
} else if (y2 <= y1 && y2 < axisy.min) { points=points3;
if (y1 < axisy.min) continue;
continue; }
x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = axisy.min; if (ps < 0 && i == segmentStart + ps) {
} // done with the reverse sweep
ctx.fill();
// clip with ymax areaOpen = false;
if (y1 >= y2 && y1 > axisy.max) { ps = -ps;
if (y2 > axisy.max) ypos = 1;
continue; points=points2;
x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1; i = segmentStart = segmentEnd + ps;
y1 = axisy.max; continue;
} else if (y2 >= y1 && y2 > axisy.max) { }
if (y1 > axisy.max) }
continue;
x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1; if (x1 == null || x2 == null)
y2 = axisy.max; continue;
}
// clip x values
// clip with xmin
if (x1 <= x2 && x1 < axisx.min) { // clip with xmin
if (x2 < axisx.min) if (x1 <= x2 && x1 < axisx.min) {
continue; if (x2 < axisx.min)
y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1; continue;
x1 = axisx.min; y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
} else if (x2 <= x1 && x2 < axisx.min) { x1 = axisx.min;
if (x1 < axisx.min) }
continue; else if (x2 <= x1 && x2 < axisx.min) {
y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1; if (x1 < axisx.min)
x2 = 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) // clip with xmax
continue; if (x1 >= x2 && x1 > axisx.max) {
y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1; if (x2 > axisx.max)
x1 = axisx.max; continue;
} else if (x2 >= x1 && x2 > axisx.max) { y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
if (x1 > axisx.max) x1 = axisx.max;
continue; }
y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1; else if (x2 >= x1 && x2 > axisx.max) {
x2 = axisx.max; if (x1 > axisx.max)
} continue;
y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
if (x1 != prevx || y1 != prevy) x2 = axisx.max;
ctx.lineTo(axisx.p2c(x1), axisy.p2c(y1)); }
if (prevx == null) { if (!areaOpen) {
firsty = y2; // open area
} ctx.beginPath();
prevx = x2; ctx.moveTo(axisx.p2c(x1), axisy.p2c(bottom));
prevy = y2; areaOpen = true;
ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2)); }
}
if (fill) { // now first check the case where both is outside
ctx.lineTo(axisx.p2c(axisx.max), axisy.p2c(axisy.min)); if (y1 >= axisy.max && y2 >= axisy.max) {
ctx.lineTo(axisx.p2c(axisx.min), axisy.p2c(axisy.min)); ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.max));
ctx.lineTo(axisx.p2c(axisx.min), axisy.p2c(firsty)); ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.max));
ctx.fill(); continue;
} }
ctx.stroke(); else if (y1 <= axisy.min && y2 <= axisy.min) {
} ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.min));
ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.min));
//no real idea whats going on here code mainly from https://code.google.com/p/flot/issues/detail?id=226 continue;
//if fit option is selected additional datapoints get inserted before the curve calculations in nergal.dev s code. }
function calculateCurvePoints(data, curvedLinesOptions) {
// else it's a bit more complicated, there might
var num = curvedLinesOptions.curvePointFactor * data.length; // be a flat maxed out rectangle first, then a
var xdata = new Array; // triangular cutout or reverse; to find these
var ydata = new Array; // keep track of the current x values
var x1old = x1, x2old = x2;
// clip the y values, without shortcutting, we
// go through all cases in turn
// clip with ymin
if (y1 <= y2 && y1 < axisy.min && y2 >= axisy.min) {
x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = axisy.min;
}
else if (y2 <= y1 && y2 < axisy.min && y1 >= axisy.min) {
x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = axisy.min;
}
// clip with ymax
if (y1 >= y2 && y1 > axisy.max && y2 <= axisy.max) {
x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = axisy.max;
}
else if (y2 >= y1 && y2 > axisy.max && y1 <= axisy.max) {
x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = axisy.max;
}
// if the x value was changed we got a rectangle
// to fill
if (x1 != x1old) {
ctx.lineTo(axisx.p2c(x1old), axisy.p2c(y1));
// it goes to (x1, y1), but we fill that below
}
// fill triangular section, this sometimes result
// in redundant points if (x1, y1) hasn't changed
// from previous line to, but we just ignore that
ctx.lineTo(axisx.p2c(x1), axisy.p2c(y1));
ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));
// fill the other rectangle if it's there
if (x2 != x2old) {
ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));
ctx.lineTo(axisx.p2c(x2old), axisy.p2c(y2));
}
}
}
//nearly the same as in the core library
function plotLine(ctx, points, axisx, axisy,ps) {
var X = 0; var prevx = null;
var Y = 1; var prevy = null;
if (curvedLinesOptions.fit) { ctx.beginPath();
//insert a point before and after the "real" data point to force the line
//to have a max,min at the data point however only if it is a lowest or highest point of the for (var i = ps; i < points.length; i += ps) {
//curve => avoid saddles var x1 = points[i - ps], y1 = points[i - ps + 1];
var neigh = curvedLinesOptions.fitPointDist; var x2 = points[i], y2 = points[i + 1];
var j = 0;
if (x1 == null || x2 == null)
for (var i = 0; i < data.length; i++) { continue;
var front = new Array; // clip with ymin
var back = new Array; if (y1 <= y2 && y1 < axisy.min) {
if (y2 < axisy.min)
//smooth front continue; // line segment is outside
front[X] = data[i][X] - 0.1; // compute new intersection point
if (i > 0) { x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
front[Y] = data[i-1][Y] * neigh + data[i][Y] * (1 - neigh); y1 = axisy.min;
} else { }
front[Y] = data[i][Y]; else if (y2 <= y1 && y2 < axisy.min) {
} if (y1 < axisy.min)
continue;
x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
//smooth back y2 = axisy.min;
back[X] = data[i][X] + 0.1; }
if ((i + 1) < data.length) {
back[Y] = data[i+1][Y] * neigh + data[i][Y] * (1 - neigh); // clip with ymax
} else { if (y1 >= y2 && y1 > axisy.max) {
back[Y] = data[i][Y]; if (y2 > axisy.max)
} continue;
x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
//test for a saddle y1 = axisy.max;
if ((front[Y] <= data[i][Y] && back[Y] <= data[i][Y]) || //max or partial horizontal }
(front[Y] >= data[i][Y] && back[Y] >= data[i][Y])) { //min or partial horizontal else if (y2 >= y1 && y2 > axisy.max) {
if (y1 > axisy.max)
//add curve points continue;
xdata[j] = front[X]; x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
ydata[j] = front[Y]; y2 = axisy.max;
j++; }
xdata[j] = data[i][0]; // clip with xmin
ydata[j] = data[i][1]; if (x1 <= x2 && x1 < axisx.min) {
j++; if (x2 < axisx.min)
continue;
xdata[j] = back[X]; y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
ydata[j] = back[Y]; x1 = axisx.min;
j++; }
} else { //saddle else if (x2 <= x1 && x2 < axisx.min) {
//use original point only if (x1 < axisx.min)
xdata[j] = data[i][0]; continue;
ydata[j] = data[i][1]; y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
j++; x2 = axisx.min;
} }
// clip with xmax
} if (x1 >= x2 && x1 > axisx.max) {
} else { if (x2 > axisx.max)
//just use the datapoints continue;
for (var i = 0; i < data.length; i++) { y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
xdata[i] = data[i][0]; x1 = axisx.max;
ydata[i] = data[i][1]; }
} else if (x2 >= x1 && x2 > axisx.max) {
} if (x1 > axisx.max)
continue;
var n = xdata.length; y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = axisx.max;
var y2 = new Array(); }
var delta = new Array();
y2[0] = 0; if (x1 != prevx || y1 != prevy)
y2[n - 1] = 0; ctx.lineTo(axisx.p2c(x1), axisy.p2c(y1));
delta[0] = 0;
for (var i = 1; i < n - 1; ++i) { prevx = x2;
var d = (xdata[i + 1] - xdata[i - 1]); prevy = y2;
if (d == 0) { ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));
return null; }
}
ctx.stroke();
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 : '0.3'
});
//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,yPos) {
var num = curvedLinesOptions.curvePointFactor * data.length;
var xdata = new Array;
var ydata = new Array;
var X = 0;
var Y = yPos;
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 however only if it is a lowest or highest point of the
//curve => avoid saddles
var neigh = curvedLinesOptions.fitPointDist;
var j = 0;
for (var i = 0; i < data.length; i++) {
var front = new Array;
var back = new Array;
//smooth front
front[X] = data[i][X] - 0.1;
if (i > 0) {
front[Y] = data[i-1][Y] * neigh + data[i][Y] * (1 - neigh);
} else {
front[Y] = data[i][Y];
}
//smooth back
back[X] = data[i][X] + 0.1;
if ((i + 1) < data.length) {
back[Y] = data[i+1][Y] * neigh + data[i][Y] * (1 - neigh);
} else {
back[Y] = data[i][Y];
}
//test for a saddle
if ((front[Y] <= data[i][Y] && back[Y] <= data[i][Y]) || //max or partial horizontal
(front[Y] >= data[i][Y] && back[Y] >= data[i][Y])) { //min or partial horizontal
//add curve points
xdata[j] = front[X];
ydata[j] = front[Y];
j++;
xdata[j] = data[i][X];
ydata[j] = data[i][Y];
j++;
xdata[j] = back[X];
ydata[j] = back[Y];
j++;
} else { //saddle
//use original point only
xdata[j] = data[i][X];
ydata[j] = data[i][Y];
j++;
}
}
} else {
//just use the datapoints
for (var i = 0; i < data.length; i++) {
xdata[i] = data[i][X];
ydata[i] = data[i][Y];
}
}
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.plugincurvedLines=true;
$.plot.plugins.push({
init: init,
options: options,
name: 'curvedLines',
version: '0.4'
});
})(jQuery); })(jQuery);
return jQuery.plot.plugincurvedLines;
});
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