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316 lines
12 KiB
JavaScript
316 lines
12 KiB
JavaScript
3 years ago
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/* The MIT License
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Copyright (c) 2011 by Michael Zinsmaier and nergal.dev
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Copyright (c) 2012 by Thomas Ritou
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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/*
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____________________________________________________
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what it is:
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____________________________________________________
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curvedLines is a plugin for flot, that tries to display lines in a smoother way.
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The plugin is based on nergal.dev's work https://code.google.com/p/flot/issues/detail?id=226
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and further extended with a mode that forces the min/max points of the curves to be on the
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points. Both modes are achieved through adding of more data points
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=> 1) with large data sets you may get trouble
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=> 2) if you want to display the points too, you have to plot them as 2nd data series over the lines
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&& 3) consecutive x data points are not allowed to have the same value
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This is version 0.5 of curvedLines so it will probably not work in every case. However
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the basic form of use descirbed next works (:
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Feel free to further improve the code
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____________________________________________________
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how to use it:
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____________________________________________________
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var d1 = [[5,5],[7,3],[9,12]];
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var options = { series: { curvedLines: { active: true }}};
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$.plot($("#placeholder"), [{data = d1, lines: { show: true}, curvedLines: {apply: true}}], options);
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_____________________________________________________
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options:
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_____________________________________________________
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active: bool true => plugin can be used
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apply: bool true => series will be drawn as curved line
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fit: bool true => forces the max,mins of the curve to be on the datapoints
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curvePointFactor int defines how many "virtual" points are used per "real" data point to
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emulate the curvedLines (points total = real points * curvePointFactor)
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fitPointDist: int defines the x axis distance of the additional two points that are used
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to enforce the min max condition.
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+ line options (since v0.5 curved lines use flots line implementation for drawing
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=> line options like fill, show ... are supported out of the box)
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*/
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/*
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* v0.1 initial commit
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* v0.15 negative values should work now (outcommented a negative -> 0 hook hope it does no harm)
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* v0.2 added fill option (thanks to monemihir) and multi axis support (thanks to soewono effendi)
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* v0.3 improved saddle handling and added basic handling of Dates
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* 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
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* v0.5 rewritten instead of implementing a own draw function CurvedLines is now based on the processDatapoints flot hook (credits go to thomas ritou).
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* This change breakes existing code however CurvedLines are now just many tiny straight lines to flot and therefore all flot lines options (like gradient fill,
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* shadow) are now supported out of the box
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* v0.6 flot 0.8 compatibility and some bug fixes
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*/
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(function($) {
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var options = {
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series : {
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curvedLines : {
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active : false,
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apply: false,
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fit : false,
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curvePointFactor : 20,
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fitPointDist : undefined
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}
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}
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};
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function init(plot) {
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plot.hooks.processOptions.push(processOptions);
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//if the plugin is active register processDatapoints method
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function processOptions(plot, options) {
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if (options.series.curvedLines.active) {
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plot.hooks.processDatapoints.unshift(processDatapoints);
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}
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}
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//only if the plugin is active
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function processDatapoints(plot, series, datapoints) {
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var nrPoints = datapoints.points.length / datapoints.pointsize;
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var EPSILON = 0.5; //pretty large epsilon but save
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if (series.curvedLines.apply == true && series.originSeries === undefined && nrPoints > (1 + EPSILON)) {
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if (series.lines.fill) {
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var pointsTop = calculateCurvePoints(datapoints, series.curvedLines, 1)
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,pointsBottom = calculateCurvePoints(datapoints, series.curvedLines, 2); //flot makes sure for us that we've got a second y point if fill is true !
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//Merge top and bottom curve
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datapoints.pointsize = 3;
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datapoints.points = [];
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var j = 0;
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var k = 0;
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var i = 0;
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var ps = 2;
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while (i < pointsTop.length || j < pointsBottom.length) {
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if (pointsTop[i] == pointsBottom[j]) {
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datapoints.points[k] = pointsTop[i];
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datapoints.points[k + 1] = pointsTop[i + 1];
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datapoints.points[k + 2] = pointsBottom[j + 1];
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j += ps;
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i += ps;
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} else if (pointsTop[i] < pointsBottom[j]) {
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datapoints.points[k] = pointsTop[i];
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datapoints.points[k + 1] = pointsTop[i + 1];
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datapoints.points[k + 2] = k > 0 ? datapoints.points[k-1] : null;
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i += ps;
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} else {
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datapoints.points[k] = pointsBottom[j];
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datapoints.points[k + 1] = k > 1 ? datapoints.points[k-2] : null;
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datapoints.points[k + 2] = pointsBottom[j + 1];
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j += ps;
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}
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k += 3;
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}
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} else if (series.lines.lineWidth > 0) {
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datapoints.points = calculateCurvePoints(datapoints, series.curvedLines, 1);
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datapoints.pointsize = 2;
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}
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}
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}
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//no real idea whats going on here code mainly from https://code.google.com/p/flot/issues/detail?id=226
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//if fit option is selected additional datapoints get inserted before the curve calculations in nergal.dev s code.
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function calculateCurvePoints(datapoints, curvedLinesOptions, yPos) {
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var points = datapoints.points, ps = datapoints.pointsize;
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var num = curvedLinesOptions.curvePointFactor * (points.length / ps);
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var xdata = new Array;
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var ydata = new Array;
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var curX = -1;
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var curY = -1;
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var j = 0;
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if (curvedLinesOptions.fit) {
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//insert a point before and after the "real" data point to force the line
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//to have a max,min at the data point.
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var fpDist;
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if(typeof curvedLinesOptions.fitPointDist == 'undefined') {
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//estimate it
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var minX = points[0];
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var maxX = points[points.length-ps];
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fpDist = (maxX - minX) / (500 * 100); //x range / (estimated pixel length of placeholder * factor)
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} else {
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//use user defined value
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fpDist = curvedLinesOptions.fitPointDist;
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}
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for (var i = 0; i < points.length; i += ps) {
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var frontX;
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var backX;
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curX = i;
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curY = i + yPos;
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//add point X s
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frontX = points[curX] - fpDist;
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backX = points[curX] + fpDist;
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var factor = 2;
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while (frontX == points[curX] || backX == points[curX]) {
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//inside the ulp
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frontX = points[curX] - (fpDist * factor);
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backX = points[curX] + (fpDist * factor);
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factor++;
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}
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//add curve points
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xdata[j] = frontX;
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ydata[j] = points[curY];
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j++;
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xdata[j] = points[curX];
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ydata[j] = points[curY];
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j++;
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xdata[j] = backX;
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ydata[j] = points[curY];
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j++;
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}
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} else {
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//just use the datapoints
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for (var i = 0; i < points.length; i += ps) {
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curX = i;
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curY = i + yPos;
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xdata[j] = points[curX];
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ydata[j] = points[curY];
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j++;
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}
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}
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var n = xdata.length;
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var y2 = new Array();
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var delta = new Array();
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y2[0] = 0;
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y2[n - 1] = 0;
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delta[0] = 0;
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for (var i = 1; i < n - 1; ++i) {
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var d = (xdata[i + 1] - xdata[i - 1]);
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if (d == 0) {
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//point before current point and after current point need some space in between
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return [];
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}
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var s = (xdata[i] - xdata[i - 1]) / d;
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var p = s * y2[i - 1] + 2;
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y2[i] = (s - 1) / p;
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delta[i] = (ydata[i + 1] - ydata[i]) / (xdata[i + 1] - xdata[i]) - (ydata[i] - ydata[i - 1]) / (xdata[i] - xdata[i - 1]);
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delta[i] = (6 * delta[i] / (xdata[i + 1] - xdata[i - 1]) - s * delta[i - 1]) / p;
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}
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for (var j = n - 2; j >= 0; --j) {
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y2[j] = y2[j] * y2[j + 1] + delta[j];
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}
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// xmax - xmin / #points
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var step = (xdata[n - 1] - xdata[0]) / (num - 1);
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var xnew = new Array;
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var ynew = new Array;
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var result = new Array;
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xnew[0] = xdata[0];
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ynew[0] = ydata[0];
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result.push(xnew[0]);
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result.push(ynew[0]);
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for ( j = 1; j < num; ++j) {
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//new x point (sampling point for the created curve)
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xnew[j] = xnew[0] + j * step;
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var max = n - 1;
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var min = 0;
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while (max - min > 1) {
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var k = Math.round((max + min) / 2);
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if (xdata[k] > xnew[j]) {
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max = k;
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} else {
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min = k;
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}
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}
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//found point one to the left and one to the right of generated new point
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var h = (xdata[max] - xdata[min]);
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if (h == 0) {
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//similar to above two points from original x data need some space between them
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return [];
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}
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var a = (xdata[max] - xnew[j]) / h;
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var b = (xnew[j] - xdata[min]) / h;
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ynew[j] = a * ydata[min] + b * ydata[max] + ((a * a * a - a) * y2[min] + (b * b * b - b) * y2[max]) * (h * h) / 6;
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result.push(xnew[j]);
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result.push(ynew[j]);
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}
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return result;
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}
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}//end init
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$.plot.plugins.push({
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init : init,
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options : options,
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name : 'curvedLines',
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version : '0.5'
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});
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})(jQuery);
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