forked from external-repos/pa11y-dashboard
Add dashed lines to graph
This commit is contained in:
Alex Kilgour
228
public/js/vendor/flot/jquery.flot.dashes.js
vendored
Normal file
228
public/js/vendor/flot/jquery.flot.dashes.js
vendored
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/*
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* jQuery.flot.dashes
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*
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* options = {
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* series: {
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* dashes: {
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*
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* // show
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* // default: false
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* // Whether to show dashes for the series.
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* show: <boolean>,
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*
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* // lineWidth
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* // default: 2
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* // The width of the dashed line in pixels.
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* lineWidth: <number>,
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*
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* // dashLength
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* // default: 10
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* // Controls the length of the individual dashes and the amount of
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* // space between them.
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* // If this is a number, the dashes and spaces will have that length.
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* // If this is an array, it is read as [ dashLength, spaceLength ]
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* dashLength: <number> or <array[2]>
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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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function init(plot) {
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plot.hooks.drawSeries.push(function(plot, ctx, series) {
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if (!series.dashes.show) return;
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var plotOffset = plot.getPlotOffset(),
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axisx = series.xaxis,
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axisy = series.yaxis;
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function plotDashes(xoffset, yoffset) {
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var points = series.datapoints.points,
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ps = series.datapoints.pointsize,
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prevx = null,
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prevy = null,
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dashRemainder = 0,
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dashOn = true,
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dashOnLength,
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dashOffLength;
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if (series.dashes.dashLength[0]) {
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dashOnLength = series.dashes.dashLength[0];
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if (series.dashes.dashLength[1]) {
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dashOffLength = series.dashes.dashLength[1];
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} else {
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dashOffLength = dashOnLength;
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}
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} else {
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dashOffLength = dashOnLength = series.dashes.dashLength;
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}
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ctx.beginPath();
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for (var i = ps; i < points.length; i += ps) {
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var x1 = points[i - ps],
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y1 = points[i - ps + 1],
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x2 = points[i],
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y2 = points[i + 1];
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if (x1 == null || x2 == null) continue;
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// clip with ymin
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if (y1 <= y2 && y1 < axisy.min) {
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if (y2 < axisy.min) continue; // line segment is outside
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// compute new intersection point
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x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
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y1 = axisy.min;
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} else if (y2 <= y1 && y2 < axisy.min) {
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if (y1 < axisy.min) continue;
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x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
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y2 = axisy.min;
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}
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// clip with ymax
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if (y1 >= y2 && y1 > axisy.max) {
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if (y2 > axisy.max) continue;
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x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
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y1 = axisy.max;
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} else if (y2 >= y1 && y2 > axisy.max) {
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if (y1 > axisy.max) continue;
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x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
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y2 = axisy.max;
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}
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// clip with xmin
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if (x1 <= x2 && x1 < axisx.min) {
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if (x2 < axisx.min) continue;
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y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
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x1 = axisx.min;
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} else if (x2 <= x1 && x2 < axisx.min) {
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if (x1 < axisx.min) continue;
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y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
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x2 = axisx.min;
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}
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// clip with xmax
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if (x1 >= x2 && x1 > axisx.max) {
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if (x2 > axisx.max) continue;
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y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
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x1 = axisx.max;
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} else if (x2 >= x1 && x2 > axisx.max) {
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if (x1 > axisx.max) continue;
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y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
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x2 = axisx.max;
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}
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if (x1 != prevx || y1 != prevy) {
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ctx.moveTo(axisx.p2c(x1) + xoffset, axisy.p2c(y1) + yoffset);
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}
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var ax1 = axisx.p2c(x1) + xoffset,
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ay1 = axisy.p2c(y1) + yoffset,
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ax2 = axisx.p2c(x2) + xoffset,
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ay2 = axisy.p2c(y2) + yoffset,
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dashOffset;
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function lineSegmentOffset(segmentLength) {
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var c = Math.sqrt(Math.pow(ax2 - ax1, 2) + Math.pow(ay2 - ay1, 2));
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if (c <= segmentLength) {
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return {
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deltaX: ax2 - ax1,
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deltaY: ay2 - ay1,
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distance: c,
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remainder: segmentLength - c
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}
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} else {
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var xsign = ax2 > ax1 ? 1 : -1,
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ysign = ay2 > ay1 ? 1 : -1;
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return {
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deltaX: xsign * Math.sqrt(Math.pow(segmentLength, 2) / (1 + Math.pow((ay2 - ay1)/(ax2 - ax1), 2))),
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deltaY: ysign * Math.sqrt(Math.pow(segmentLength, 2) - Math.pow(segmentLength, 2) / (1 + Math.pow((ay2 - ay1)/(ax2 - ax1), 2))),
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distance: segmentLength,
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remainder: 0
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};
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}
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}
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//-end lineSegmentOffset
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do {
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dashOffset = lineSegmentOffset(
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dashRemainder > 0 ? dashRemainder :
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dashOn ? dashOnLength : dashOffLength);
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if (dashOffset.deltaX != 0 || dashOffset.deltaY != 0) {
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if (dashOn) {
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ctx.lineTo(ax1 + dashOffset.deltaX, ay1 + dashOffset.deltaY);
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} else {
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ctx.moveTo(ax1 + dashOffset.deltaX, ay1 + dashOffset.deltaY);
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}
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}
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dashOn = !dashOn;
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dashRemainder = dashOffset.remainder;
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ax1 += dashOffset.deltaX;
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ay1 += dashOffset.deltaY;
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} while (dashOffset.distance > 0);
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prevx = x2;
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prevy = y2;
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}
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ctx.stroke();
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}
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//-end plotDashes
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ctx.save();
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ctx.translate(plotOffset.left, plotOffset.top);
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ctx.lineJoin = 'round';
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var lw = series.dashes.lineWidth,
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sw = series.shadowSize;
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// FIXME: consider another form of shadow when filling is turned on
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if (lw > 0 && sw > 0) {
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// draw shadow as a thick and thin line with transparency
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ctx.lineWidth = sw;
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ctx.strokeStyle = "rgba(0,0,0,0.1)";
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// position shadow at angle from the mid of line
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var angle = Math.PI/18;
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plotDashes(Math.sin(angle) * (lw/2 + sw/2), Math.cos(angle) * (lw/2 + sw/2));
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ctx.lineWidth = sw/2;
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plotDashes(Math.sin(angle) * (lw/2 + sw/4), Math.cos(angle) * (lw/2 + sw/4));
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}
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ctx.lineWidth = lw;
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ctx.strokeStyle = series.color;
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if (lw > 0) {
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plotDashes(0, 0);
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}
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ctx.restore();
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});
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//-end draw hook
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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: {
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series: {
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dashes: {
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show: false,
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lineWidth: 2,
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dashLength: 10
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}
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}
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},
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name: 'dashes',
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version: '0.1'
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});
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})(jQuery)
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