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/**
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* Flot plugin that provides spline interpolation for line graphs
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* author: Alex Bardas < [email protected] >
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* modified by: Avi Kohn https://github.com/AMKohn
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* based on the spline interpolation described at:
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* http://scaledinnovation.com/analytics/splines/aboutSplines.html
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*
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* Example usage: (add in plot options series object)
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* for linespline:
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* series: {
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* ...
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* lines: {
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* show: false
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* },
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* splines: {
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* show: true,
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* tension: x, (float between 0 and 1, defaults to 0.5),
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* lineWidth: y (number, defaults to 2),
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* fill: z (float between 0 .. 1 or false, as in flot documentation)
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* },
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* ...
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* }
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* areaspline:
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* series: {
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* ...
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* lines: {
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* show: true,
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* lineWidth: 0, (line drawing will not execute)
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* fill: x, (float between 0 .. 1, as in flot documentation)
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* ...
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* },
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* splines: {
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* show: true,
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* tension: 0.5 (float between 0 and 1)
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* },
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* ...
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* }
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*
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*/
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(function($) {
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'use strict'
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/**
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* @param {Number} x0, y0, x1, y1: coordinates of the end (knot) points of the segment
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* @param {Number} x2, y2: the next knot (not connected, but needed to calculate p2)
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* @param {Number} tension: control how far the control points spread
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* @return {Array}: p1 -> control point, from x1 back toward x0
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* p2 -> the next control point, returned to become the next segment's p1
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*
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* @api private
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*/
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function getControlPoints(x0, y0, x1, y1, x2, y2, tension) {
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var pow = Math.pow,
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sqrt = Math.sqrt,
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d01, d12, fa, fb, p1x, p1y, p2x, p2y;
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// Scaling factors: distances from this knot to the previous and following knots.
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d01 = sqrt(pow(x1 - x0, 2) + pow(y1 - y0, 2));
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d12 = sqrt(pow(x2 - x1, 2) + pow(y2 - y1, 2));
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fa = tension * d01 / (d01 + d12);
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fb = tension - fa;
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p1x = x1 + fa * (x0 - x2);
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p1y = y1 + fa * (y0 - y2);
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p2x = x1 - fb * (x0 - x2);
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p2y = y1 - fb * (y0 - y2);
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return [p1x, p1y, p2x, p2y];
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}
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var line = [];
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function drawLine(points, ctx, height, fill, seriesColor) {
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var c = $.color.parse(seriesColor);
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c.a = typeof fill == "number" ? fill : .3;
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c.normalize();
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c = c.toString();
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ctx.beginPath();
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ctx.moveTo(points[0][0], points[0][1]);
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var plength = points.length;
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for (var i = 0; i < plength; i++) {
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ctx[points[i][3]].apply(ctx, points[i][2]);
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}
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ctx.stroke();
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ctx.lineWidth = 0;
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ctx.lineTo(points[plength - 1][0], height);
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ctx.lineTo(points[0][0], height);
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ctx.closePath();
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if (fill !== false) {
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ctx.fillStyle = c;
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ctx.fill();
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}
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}
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/**
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* @param {Object} ctx: canvas context
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* @param {String} type: accepted strings: 'bezier' or 'quadratic' (defaults to quadratic)
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* @param {Array} points: 2 points for which to draw the interpolation
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* @param {Array} cpoints: control points for those segment points
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*
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* @api private
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*/
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function queue(ctx, type, points, cpoints) {
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if (type === void 0 || (type !== 'bezier' && type !== 'quadratic')) {
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type = 'quadratic';
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}
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type = type + 'CurveTo';
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if (line.length == 0) line.push([points[0], points[1], cpoints.concat(points.slice(2)), type]);
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else if (type == "quadraticCurveTo" && points.length == 2) {
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cpoints = cpoints.slice(0, 2).concat(points);
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line.push([points[0], points[1], cpoints, type]);
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}
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else line.push([points[2], points[3], cpoints.concat(points.slice(2)), type]);
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}
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/**
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* @param {Object} plot
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* @param {Object} ctx: canvas context
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* @param {Object} series
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*
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* @api private
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*/
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function drawSpline(plot, ctx, series) {
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// Not interested if spline is not requested
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if (series.splines.show !== true) {
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return;
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}
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var cp = [],
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// array of control points
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tension = series.splines.tension || 0.5,
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idx, x, y, points = series.datapoints.points,
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ps = series.datapoints.pointsize,
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plotOffset = plot.getPlotOffset(),
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len = points.length,
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pts = [];
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line = [];
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// Cannot display a linespline/areaspline if there are less than 3 points
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if (len / ps < 4) {
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$.extend(series.lines, series.splines);
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return;
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}
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for (idx = 0; idx < len; idx += ps) {
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x = points[idx];
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y = points[idx + 1];
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if (x == null || x < series.xaxis.min || x > series.xaxis.max || y < series.yaxis.min || y > series.yaxis.max) {
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continue;
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}
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pts.push(series.xaxis.p2c(x) + plotOffset.left, series.yaxis.p2c(y) + plotOffset.top);
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}
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len = pts.length;
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// Draw an open curve, not connected at the ends
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for (idx = 0; idx < len - 2; idx += 2) {
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cp = cp.concat(getControlPoints.apply(this, pts.slice(idx, idx + 6).concat([tension])));
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}
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ctx.save();
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ctx.strokeStyle = series.color;
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ctx.lineWidth = series.splines.lineWidth;
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queue(ctx, 'quadratic', pts.slice(0, 4), cp.slice(0, 2));
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for (idx = 2; idx < len - 3; idx += 2) {
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queue(ctx, 'bezier', pts.slice(idx, idx + 4), cp.slice(2 * idx - 2, 2 * idx + 2));
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}
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queue(ctx, 'quadratic', pts.slice(len - 2, len), [cp[2 * len - 10], cp[2 * len - 9], pts[len - 4], pts[len - 3]]);
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drawLine(line, ctx, plot.height() + 10, series.splines.fill, series.color);
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ctx.restore();
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}
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$.plot.plugins.push({
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init: function(plot) {
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plot.hooks.drawSeries.push(drawSpline);
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},
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options: {
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series: {
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splines: {
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show: false,
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lineWidth: 2,
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tension: 0.5,
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fill: false
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}
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}
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},
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name: 'spline',
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version: '0.8.2'
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});
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})(jQuery);
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aepnat /
simpuskesmas
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