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