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jquery.flot.extra.js
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jquery.flot.extra.js
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/* Javascript flot charts plagin with extra elements drawing and touch support
Copyright (c) 2013-2018 Yuri Dursin
Licensed under the MIT license.
Touch pan and zoom requires flot.navigate plugin
Extra plugin supports configuration options:
extra: {
touch: true, // touch pan, zoom and tap events enable (by default)
color: color, // default drawing color for lines
fillColor: color, // default filling color for markers
lineWidth: 1, // default line width
lineWidthRect: 0, // default line width for rect
lineWidthMarker: 1, // default line width for markers
lineJoin: "round", // default line join style
cropByBounds: true, // crop by plot bounds flag
background: true, // drawing rectangles at background
transparent: 1, // drawing rectangles with alpha channel on value < 1
markerRadius: 3, // default marker radius
markerSymbol: 'circle', // default marker symbol
shadowSize: 2, // default shadow size for markers
shadowBlur: 10, // default shadow blur for lines
shadowBlurText: 3, // default shadow blur for text
shadowColor: '#000',
shadowColorText: '#666',
textAlign: 'left',
textBaseline: 'bottom',
textColor: '#444',
textFont: '14px arial',
// array of rectangles, all parameters are optional
rectangles: [{
left: left,
top: top,
right: right,
bottom: bottom,
color: color
lineJoin: join,
lineWidth: width,
}],
// array of vertical lines
verticalLines: [{
location: 55,
color: color,
lineWidth: width,
shadowBlur: 10
}],
// array of horizontal lines
horizontalLines: [{
location: 100,
color: color,
lineWidth: width,
shadowSize: 2
}]
// array of markers
markers: [{
x: 10,
y: 10,
symbol: function or reserved: 'circle', 'square', 'diamond', 'cross', 'triangle', 'triangle_down'
radius: 3,
color: color,
fillColor: color,
lineWidth: width,
shadowSize: 2,
text: 'string'
}]
}
Example usage:
var plot = $.plot(parent, [[]], {
extra:{
rectangles: [{ left: (new Date(2013,8,26)).getTime(), right: (new Date(2013,8,27)).getTime() }],
horizontalLines: [{ location: 120 }],
verticalLines: [{ location: (new Date(2013,8,25)).getTime() }]
markers: [{ x: (new Date(2018,5,1)).getTime(), y: 100, radius: 5, symbol: 'triangle', color: '#ff0000', fillColor: '#800000' }]
}
zoom: {
interactive: true
},
pan: {
interactive: true
}
})
plot.bind('plottap', function(event, ntap, ktap, pos) {
if (ntap === 1 && ktap === 2) {
// single click with two fingers
}
})
*/
(function ($) {
var pan_count_motion = 10;
var tap_tmout_touch = 300;
var tap_tmout_untouch = 300;
var symbols = {
circle: function (ctx, x, y, radius, shadow) {
ctx.arc(x, y, radius, 0, shadow ? Math.PI : Math.PI * 2, false);
},
square: function (ctx, x, y, radius, shadow) {
var size = radius * Math.sqrt(Math.PI) / 2;
ctx.rect(x - size, y - size, size + size, size + size);
},
diamond: function (ctx, x, y, radius, shadow) {
var size = radius * Math.sqrt(Math.PI / 2);
ctx.moveTo(x - size, y);
ctx.lineTo(x, y - size);
ctx.lineTo(x + size, y);
ctx.lineTo(x, y + size);
ctx.lineTo(x - size, y);
},
cross: function (ctx, x, y, radius, shadow) {
var size = radius * Math.sqrt(Math.PI) / 2;
ctx.moveTo(x - size, y - size);
ctx.lineTo(x + size, y + size);
ctx.moveTo(x - size, y + size);
ctx.lineTo(x + size, y - size);
},
triangle: function (ctx, x, y, radius, shadow) {
var size = radius * Math.sqrt(2 * Math.PI / Math.sin(Math.PI / 3));
var height = size * Math.sin(Math.PI / 3);
ctx.moveTo(x - size/2, y + height/2);
ctx.lineTo(x + size/2, y + height/2);
if (!shadow) {
ctx.lineTo(x, y - height/2);
ctx.lineTo(x - size/2, y + height/2);
}
},
triangle_down: function(ctx, x, y, radius, shadow) {
var size = radius * Math.sqrt(2 * Math.PI / Math.sin(Math.PI / 3));
var height = size * Math.sin(Math.PI / 3);
ctx.moveTo(x - size/2, y - height/2);
ctx.lineTo(x + size/2, y - height/2);
if (!shadow) {
ctx.lineTo(x, y + height/2);
ctx.lineTo(x - size/2, y - height/2);
}
}
}
function init(plot) {
// draw extra rectangles
function draw_rectangles(plot, ctx, extra, background) {
var rectangles = extra.rectangles;
if (!rectangles) return;
var width = plot.width(), height = plot.height();
var rect, p1, p2, x, y, w, h, lineWidth, color;
for (var i = 0, cnt = rectangles.length; i < cnt; i++) {
rect = rectangles[i];
if (Array.isArray(rect)) {
if (rect.length < 4) rect = { left: rect[0], right: rect[1], color: rect[2] }
else rect = { left: rect[0], top: rect[1], right: rect[2], bottom: rect[3], color: rect[4] }
}
// prepare coordinates
p1 = plot.p2c({ x: rect.left, y: rect.top });
p2 = plot.p2c({ x: rect.right, y: rect.bottom });
if (typeof(p1.left) === 'undefined') p1.left = 0;
if (typeof(p2.left) === 'undefined') p2.left = width;
if (typeof(p1.top) === 'undefined') p1.top = 0;
if (typeof(p2.top) === 'undefined') p2.top = height;
x = Math.min(p1.left, p2.left);
y = Math.min(p1.top, p2.top);
w = Math.abs(p2.left - p1.left);
h = Math.abs(p2.top - p1.top);
// crop by plot bounds
if (extra.cropByBounds) {
if (x + w <= 0 || x >= width) w = 0;
else {
if (x < 0) { w += x; x = 0; }
if (x + w > width) w = width - x;
}
if (y + h <= 0 || y >= height) h = 0;
else {
if (y < 0) { h += y; y = 0; }
if (y + h > height) h = height - y;
}
}
// draw rect
if (w > 0 || h > 0) {
lineWidth = rect.lineWidth || extra.lineWidthRect;
color = rect.color || extra.color;
if (extra.transparent < 1) {
color = $.color.parse(color).scale('a', extra.transparent).toString();
}
ctx.fillStyle = color;
ctx.fillRect(x, y, w, h);
if (lineWidth > 0) {
color = rect.color || extra.color;
if (extra.transparent < 0.9) {
color = $.color.parse(color).scale('a', extra.transparent + 0.1).toString();
}
ctx.lineWidth = lineWidth;
ctx.lineJoin = rect.lineJoin || extra.lineJoin;
ctx.strokeStyle = color;
ctx.strokeRect(x, y, w, h);
}
}
}
}
// draw extra vertical or horizontal lines
function draw_lines(plot, ctx, extra, vertical, shadow) {
var lines = vertical ? extra.verticalLines : extra.horizontalLines;
if (!lines) return;
var axis = plot.getAxes()[vertical ? 'xaxis' : 'yaxis'];
var len = vertical ? plot.height() : plot.width();
var line, v, shadowSize;
for (var i = 0, cnt = lines.length; i < cnt; i++) {
line = lines[i];
v = line.location;
if (!(v >= axis.min && v <= axis.max)) continue;
v = axis.p2c(v);
if (shadow) {
shadowSize = line.shadowSize || extra.shadowSize;
if (!shadowSize) continue;
ctx.lineWidth = shadowSize;
ctx.strokeStyle = shadow < 2 ? 'rgba(0,0,0,0.1)' : 'rgba(0,0,0,0.2)';
v += shadow < 2 ? (shadowSize + shadowSize / 2) : (shadowSize / 2);
}
else {
ctx.strokeStyle = line.color || extra.color;
ctx.lineWidth = line.lineWidth || extra.lineWidth;
ctx.shadowBlur = line.shadowBlur || extra.shadowBlur;
ctx.shadowColor = line.shadowColor || extra.shadowColor;
}
ctx.beginPath();
if (vertical) {
ctx.moveTo(v, 0);
ctx.lineTo(v, len);
}
else {
ctx.moveTo(0, v);
ctx.lineTo(len, v);
}
ctx.stroke();
}
}
// draw extra markers
function draw_markers(plot, ctx, extra, shadow) {
var markers = extra.markers;
if (!markers) return;
var axes = plot.getAxes(), axisx = axes.xaxis, axisy = axes.yaxis;
var marker, x, y, symbol, radius, text, textAlign, textBaseline;
var strokeStyle, lineWidth, shadowSize, offset = 0;
for (var i = 0, cnt = markers.length; i < cnt; i++) {
marker = markers[i];
if (!(marker.x >= axisx.min && marker.x <= axisx.max && marker.y >= axisy.min && marker.y <= axisy.max)) continue;
x = axisx.p2c(marker.x);
y = axisy.p2c(marker.y);
// prepare symbol
symbol = marker.symbol || extra.markerSymbol;
if (typeof(symbol) !== 'function') symbol = symbols[symbol];
if (symbol) {
radius = marker.radius || extra.markerRadius;
lineWidth = marker.lineWidth || extra.lineWidthMarker;
shadowSize = marker.shadowSize || extra.shadowSize;
if (!shadow) strokeStyle = marker.color || extra.color;
else if (!shadowSize) symbol = undefined;
else if (shadow < 2) {
offset = shadowSize + shadowSize / 2;
strokeStyle = 'rgba(0,0,0,0.1)';
}
else {
offset = shadowSize / 2;
strokeStyle = 'rgba(0,0,0,0.2)';
}
}
// draw symbol
if (symbol) {
ctx.beginPath();
ctx.shadowBlur = 0;
ctx.lineWidth = shadow ? shadowSize : lineWidth;
ctx.lineJoin = marker.lineJoin || extra.lineJoin;
ctx.strokeStyle = strokeStyle;
symbol(ctx, x, y + offset, radius, shadow);
ctx.closePath();
if (!shadow) {
ctx.fillStyle = marker.fillColor || extra.fillColor;
ctx.fill();
}
ctx.stroke();
}
// draw text
if (shadow) continue;
text = marker.text;
if (typeof(text) === 'function') text = text.call(marker, plot);
if (text) {
textAlign = marker.textAlign || extra.textAlign;
textBaseline = marker.textBaseline || extra.textBaseline;
if (symbol) {
if (textBaseline === 'bottom') y -= radius;
else if (textBaseline === 'top') y += radius;
if (textAlign === 'left') x += radius;
else if (textAlign === 'right') x -= radius;
}
ctx.textAlign = textAlign;
ctx.textBaseline = textBaseline;
ctx.fillStyle = marker.textColor || extra.textColor;
ctx.shadowColor = marker.shadowColor || extra.shadowColorText;
ctx.shadowBlur = marker.shadowBlur || extra.shadowBlurText;
ctx.font = marker.font || extra.textFont;
ctx.fillText(text.toString(), x, y);
}
}
}
// draw background elements
function draw_background(plot, ctx) {
var opt = plot.getOptions();
var extra = opt.extra || {};
if (!extra.background) return;
var plotOffset = plot.getPlotOffset();
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
draw_rectangles(plot, ctx, extra, true);
ctx.restore();
}
// draw foreground elements
function draw(plot, ctx) {
var opt = plot.getOptions();
var extra = opt.extra || {};
if (!extra.rectangles && !extra.verticalLines && !extra.horizontalLines && !extra.markers) return;
var plotOffset = plot.getPlotOffset();
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
// draw rectangles foreground
if (!extra.background) {
draw_rectangles(plot, ctx, extra, false);
}
// draw extra vertical and horizontal lines
draw_lines(plot, ctx, extra, true, 0);
draw_lines(plot, ctx, extra, false, 0);
// draw extra markers
if (extra.markers) {
draw_markers(plot, ctx, extra, 1);
draw_markers(plot, ctx, extra, 2);
draw_markers(plot, ctx, extra, 0);
}
ctx.restore();
}
// extended version zoom from navigate plugin
plot.zoom2 = function (args) {
if (!args) args = {};
var c = args.center,
amountx = args.amountx, amounty = args.amounty,
w = plot.width(), h = plot.height();
if (!amountx && !amounty) amountx = amounty = args.amount || plot.getOptions().zoom.amount;
if (!c) c = { left: w / 2, top: h / 2 };
var xf = c.left / w,
yf = c.top / h,
minmax = {};
if (amountx) minmax.x = {
min: c.left - xf * w / amountx,
max: c.left + (1 - xf) * w / amountx
}
if (amounty) minmax.y = {
min: c.top - yf * h / amounty,
max: c.top + (1 - yf) * h / amounty
}
$.each(plot.getAxes(), function(_, axis) {
var axis_minmax = minmax[axis.direction];
if (!axis_minmax) return;
var opts = axis.options,
min = axis_minmax.min,
max = axis_minmax.max,
zr = opts.zoomRange,
pr = opts.panRange;
if (zr === false) // no zooming on this axis
return;
min = axis.c2p(min);
max = axis.c2p(max);
if (min > max) {
// make sure min < max
var tmp = min;
min = max;
max = tmp;
}
//Check that we are in panRange
if (pr) {
if (pr[0] != null && min < pr[0]) {
min = pr[0];
}
if (pr[1] != null && max > pr[1]) {
max = pr[1];
}
}
var range = max - min;
if (zr &&
((zr[0] != null && range < zr[0] && amount >1) ||
(zr[1] != null && range > zr[1] && amount <1)))
return;
opts.min = min;
opts.max = max;
});
plot.setupGrid();
plot.draw();
if (!args.preventEvent)
plot.getPlaceholder().trigger('plotzoom', [ plot, args ]);
}
// process touch events
var touch = {};
function touch_clear() {
if (touch.t) clearTimeout(touch.t)
touch.p = touch.d = touch.t = touch.n = undefined;
}
function touch_pan(p, tmout) {
if (touch.p && !touch.t) touch.t = setTimeout(function() {
touch.t = undefined;
var ofsx = touch.p.left - p.left;
var ofsy = touch.p.top - p.top;
plot.pan({ left: ofsx, top: ofsy });
touch.p = p;
if (touch.n > 0) {
touch.n--;
var p2 = { left: p.left - ofsx*2/3, top: p.top - ofsy*2/3}
if (p2.left > 0 || p2.top > 0) touch_pan(p2, tmout);
}
}, tmout)
}
function touch_zoom(touches, tmout) {
var ofs = plot.offset();
var p = { left: (touches[0].pageX + touches[1].pageX) / 2 - ofs.left, top: (touches[0].pageY + touches[1].pageY) / 2 - ofs.top }
var d = [ Math.abs(touches[1].pageX - touches[0].pageX), Math.abs(touches[1].pageY - touches[0].pageY) ];
if (touch.d && !touch.t) touch.t = setTimeout(function() {
var k = 2;
plot.zoom2({
center: p,
amountx: (p.left + k*(d[0] - touch.d[0])) / p.left,
amounty: (p.top + k*(d[1] - touch.d[1])) / p.top
})
touch.d = d;
touch.t = undefined;
}, tmout)
}
function touch_tap(ntap, ktap, tap) {
var ofs = plot.offset();
var pos = plot.c2p({ left: tap.pageX - ofs.left, top: tap.pageY - ofs.top });
plot.getPlaceholder().trigger('plottap', [ntap, ktap, pos]);
}
function touch_start(evt) {
evt.preventDefault();
evt.stopPropagation();
var opt = plot.getOptions();
var pan = opt.pan || {};
var zoom = opt.zoom || {};
var touches = evt.originalEvent.touches;
// clear previus pan and zoom
touch_clear();
// prepare pan
if (pan.interactive && touches.length >= 1) {
touch.p = { left: touches[0].pageX, top: touches[0].pageY }
}
// prepare zoom
if (zoom.interactive && touches.length >= 2) {
touch.d = [ Math.abs(touches[1].pageX - touches[0].pageX), Math.abs(touches[1].pageY - touches[0].pageY) ];
}
// prepare tap
if (!touch.ttap) {
touch.ktap = touches.length;
touch.ntap = 1;
}
else if (touch.ktap !== undefined && touch.ktap < touches.length) {
touch.ktap = touches.length;
}
else {
clearTimeout(touch.ttap);
touch.ttap = undefined;
touch.ktap = touches.length;
touch.ntap ++;
}
if (!touch.ttap) {
touch.tap = touches[0];
touch.ttap = setTimeout(function() {
touch.ttap = touch.ntap = touch.ktap = touch.tap = undefined;
}, tap_tmout_touch)
}
}
function touch_move(evt) {
evt.preventDefault();
var opt = plot.getOptions();
var pan = opt.pan || {};
var zoom = opt.zoom || {};
var tmout = 1000 / (pan.frameRate || 20);
var touches = evt.originalEvent.touches;
// process pan
if (pan.interactive && touches.length === 1) {
touch_pan({ left: touches[0].pageX, top: touches[0].pageY }, tmout)
}
// process zoom
if (zoom.interactive && touches.length === 2) {
touch_zoom(touches, tmout);
}
}
function touch_end(evt) {
evt.preventDefault();
var touches = evt.originalEvent.touches;
// update pan
if (touch.p && touches.length >= 1) {
touch.p = { left: touches[0].pageX, top: touches[0].pageY }
}
// set pan timeout actions
if (touch.t) touch.n = pan_count_motion;
// check tap coordinates
if (touch.ttap && touch.tap) {
var changed = evt.originalEvent.changedTouches;
for (var i = 0, len = changed.length; i < len; i++) {
var tap = changed[i];
if (tap.identifier !== touch.tap.identifier) continue;
var dx = Math.abs(tap.pageX - touch.tap.pageX);
var dy = Math.abs(tap.pageY - touch.tap.pageY);
if (dx > 2 || dy > 2) {
clearTimeout(touch.ttap);
touch.ttap = touch.ntap = touch.ktap = touch.tap = undefined;
}
break;
}
}
// process tap events
if (touches.length === 0 && touch.ttap) {
var ktap = touch.ktap;
touch.ktap = undefined;
clearTimeout(touch.ttap);
touch.ttap = setTimeout(function() {
touch_tap(touch.ntap, ktap, touch.tap);
touch.ttap = touch.ntap = touch.ktap = touch.tap = undefined;
}, tap_tmout_untouch)
}
}
// init hooks
plot.hooks.drawBackground.push(draw_background);
plot.hooks.drawOverlay.push(draw);
plot.hooks.bindEvents.push(function(plot, eventHolder) {
var opt = plot.getOptions();
var extra = opt.extra || {};
var pan = opt.pan || {};
var zoom = opt.zoom || {};
if (extra.touch && (pan.interactive || zoom.interactive)) {
eventHolder
.bind('touchstart', touch_start)
.bind('touchmove', touch_move)
.bind('touchend', touch_end)
}
})
plot.hooks.shutdown.push(function(plot, eventHolder) {
eventHolder
.unbind('touchstart', touch_start)
.unbind('touchmove', touch_move)
.unbind('touchend', touch_end)
})
}
$.plot.plugins.push({
name: 'extra',
version: '2.3',
init: init,
options: {
extra: {
touch: true,
color: '#666',
fillColor: '#fff',
lineJoin: 'round',
lineWidth: 1,
lineWidthRect: 1,
lineWidthMarker: 1,
markerRadius: 3,
markerSymbol: symbols.circle,
shadowSize: 2,
shadowBlur: 10,
shadowBlurText: 3,
shadowColor: '#000',
shadowColorText: '#666',
textAlign: 'left',
textBaseline: 'bottom',
textColor: '#444',
textFont: '14px arial',
cropByBounds: true,
background: true,
transparent: 0.5,
rectangles: null,
verticalLines: null,
horizontalLines: null,
markers: null
}
}
})
})(jQuery);