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gauge.js
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/*!
* @license
* HTML5 Canvas Gauge implementation
*
* This code is subject to MIT license.
*
* Copyright (c) 2012 Mykhailo Stadnyk <[email protected]>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
* Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* @authors: Mykhailo Stadnyk <[email protected]>
* Chris Poile <[email protected]>
* Luca Invernizzi <http://www.lucainvernizzi.net>
* Rhys Lloyd <http://rhyslloyd.me>
* Robert Blackburn <http://www.rwblackburn.com>
* Charles Galpin <https://github.com/cgalpin>
* Luca Ghio <https://github.com/cassiodoroVicinetti>
* Greg <https://github.com/gregroper>
* David Esperalta <[email protected]>
* Gwenaël (https://thegtricks.thegounet.fr)
* migeruhito (https://github.com/migeruhito)
*/
/**
* @param {Object} config
* @constructor
*/
var Gauge = function (config) {
Gauge.Collection.push(this);
/**
* Default gauge configuration
* @struct
*/
this.config = {
renderTo: null,
width: 200,
height: 200,
title: false,
maxValue: 100,
minValue: 0,
majorTicks: [],
minorTicks: 10,
ticksAngle: 270,
startAngle: 45,
strokeTicks: true,
units: false,
updateValueOnAnimation: false,
valueFormat: {
"int": 3,
"dec": 2
},
majorTicksFormat: {
"int": 1,
"dec": 0
},
glow: true,
animation: {
delay: 10,
duration: 250,
fn: 'cycle'
},
colors: {
plate: '#fff',
majorTicks: '#444',
minorTicks: '#666',
title: '#888',
units: '#888',
numbers: '#444',
needle: {
start: 'rgba(240, 128, 128, 1)',
end: 'rgba(255, 160, 122, .9)',
circle: {
outerStart: '#f0f0f0',
outerEnd: '#ccc',
innerStart: '#e8e8e8',
innerEnd: '#f5f5f5'
},
shadowUp: 'rgba(2, 255, 255, 0.2)',
shadowDown: 'rgba(188, 143, 143, 0.45)'
},
valueBox: {
rectStart: '#888',
rectEnd: '#666',
background: '#babab2',
shadow: 'rgba(0, 0, 0, 1)'
},
valueText: {
foreground: '#444',
shadow: 'rgba(0, 0, 0, 0.3)'
},
circle: {
shadow: 'rgba(0, 0, 0, 0.5)',
outerStart: '#ddd',
outerEnd: '#aaa',
middleStart: '#eee',
middleEnd: '#f0f0f0',
innerStart: '#fafafa',
innerEnd: '#ccc'
}
},
needle: {
type: 'arrow', // 'arrow' or 'line'
start: 0,
end: 77,
width: 4,
circle: {
size: 10,
inner: true,
outer: true
}
},
circles: {
outerVisible: true,
middleVisible: true,
innerVisible: true
},
valueBox: {
visible: true
},
valueText: {
visible: true
},
highlights: [{
from: 20,
to: 60,
color: '#eee'
}, {
from: 60,
to: 80,
color: '#ccc'
}, {
from: 80,
to: 100,
color: '#999'
}]
};
var
value = 0,
self = this,
fromValue = 0,
toValue = 0,
imready = false;
/**
* Sets a new value to gauge and updates the gauge view
*
* @param {number} val - the new value to set to the gauge
* @return {Gauge} this - returns self
*/
this.setValue = function (val) {
fromValue = config.animation ? value : val;
var dv = (config.maxValue - config.minValue) / 100;
toValue = val > config.maxValue ?
config.maxValue + dv :
val < config.minValue ?
config.minValue - dv :
val;
value = val;
config.animation ? animate() : this.draw();
return this;
};
/**
* Sets a new value to gauge and updates the gauge view without
* any animation (even if configured)
*
* @param {number} val - the new value to set to the gauge
* @return {Gauge} this - returns self
*/
this.setRawValue = function (val) {
fromValue = value = val;
this.draw();
return this;
};
/**
* Clears the value of the gauge
* @return {Gauge}
*/
this.clear = function () {
value = fromValue = toValue = this.config.minValue;
this.draw();
return this;
};
/**
* Returns the current value been set to the gauge
*
* @return {number} value - current gauge's value
*/
this.getValue = function () {
return value;
};
/**
* Ready event for the gauge. Use it whenever you
* initialize the gauge to be assured it was fully drawn
* before you start the update on it
*
* @event onready
*/
this.onready = function () {};
function applyRecursive(dst, src) {
var i;
for (i in src) {
if (!src.hasOwnProperty(i)) {
continue;
}
// modification by Chris Poile, Oct 08, 2012. More correct check of an Array instance
if (typeof src[i] == "object" &&
!(Object.prototype.toString.call(src[i]) === '[object Array]')
&& i != 'renderTo'
) {
if (typeof dst[i] != "object") {
dst[i] = {};
}
applyRecursive(dst[i], src[i]);
}
else {
dst[i] = src[i];
}
}
}
applyRecursive(this.config, config);
config.startAngle = parseInt(config.startAngle, 10);
config.ticksAngle = parseInt(config.ticksAngle, 10);
if (isNaN(config.startAngle)) config.startAngle = 45;
if (isNaN(config.ticksAngle)) config.ticksAngle = 270;
if (config.ticksAngle > 360) config.ticksAngle = 360;
if (config.ticksAngle < 0) config.ticksAngle = 0;
if (config.startAngle < 0) config.startAngle = 0;
if (config.startAngle > 360) config.startAngle = 360;
this.config.minValue = parseFloat(this.config.minValue);
this.config.maxValue = parseFloat(this.config.maxValue);
config = this.config;
fromValue = value = config.minValue;
if (!config.renderTo) {
throw Error("Canvas element was not specified when creating the Gauge object!");
}
//noinspection JSUnresolvedVariable
var
canvas = config.renderTo.tagName ?
config.renderTo : document.getElementById(config.renderTo),
ctx = canvas.getContext('2d'),
pxRatio = window.devicePixelRatio || 1,
cache, CW, CH, CX, CY, max, cctx;
function baseInit() {
canvas.width = config.width * pxRatio;
canvas.height = config.height * pxRatio;
canvas.style.width = config.width + 'px';
canvas.style.height = config.height + 'px';
cache = canvas.cloneNode(true);
cctx = cache.getContext('2d');
CW = canvas.width;
CH = canvas.height;
CX = CW / 2;
CY = CH / 2;
max = CX < CY ? CX : CY;
cache.i8d = false;
// translate cache to have 0, 0 in center
cctx.translate(CX, CY);
cctx.save();
// translate canvas to have 0,0 in center
ctx.translate(CX, CY);
ctx.save();
}
// do basic initialization
baseInit();
/**
* Updates the gauge config
*
* @param {Object} config
* @return {Gauge}
*/
this.updateConfig = function (config) {
applyRecursive(this.config, config);
baseInit();
this.setRawValue(value || 0);
return this;
};
var animateFx = {
linear: function (p) {
return p;
},
quad: function (p) {
return Math.pow(p, 2);
},
quint: function (p) {
return Math.pow(p, 5);
},
cycle: function (p) {
return 1 - Math.sin(Math.acos(p));
},
bounce: function (p) {
return 1 - (function (p) {
for (var a = 0, b = 1; 1; a += b, b /= 2) {
if (p >= (7 - 4 * a) / 11) {
return -Math.pow((11 - 6 * a - 11 * p) / 4, 2) +
Math.pow(b, 2);
}
}
})(1 - p);
},
elastic: function (p) {
return 1 - (function (p) {
var x = 1.5;
return Math.pow(2, 10 * (p - 1)) *
Math.cos(20 * Math.PI * x / 3 * p);
})(1 - p);
}
};
var animateInterval = null;
function _animate(opts) {
var start = new Date;
animateInterval = setInterval(function () {
var
timePassed = new Date - start,
progress = timePassed / opts.duration;
if (progress > 1) {
progress = 1;
}
var animateFn = typeof opts.delta == "function" ?
opts.delta :
animateFx[opts.delta];
var delta = animateFn(progress);
opts.step(delta);
if (progress == 1) {
clearInterval(animateInterval);
}
}, opts.delay || 10);
}
function animate() {
animateInterval && clearInterval(animateInterval); // stop previous animation
var
path = (toValue - fromValue),
from = fromValue,
cfg = config.animation;
_animate({
delay: cfg.delay,
duration: cfg.duration,
delta: cfg.fn,
step: function (delta) {
fromValue = parseFloat(from) + path * delta;
config.updateValueOnAnimation ?
self.setRawValue(fromValue) :
self.draw();
}
});
}
// defaults
ctx.lineCap = "round";
this.isWaitingForInitialization = false;
this.drawWhenInitialized = function () {
if (!Gauge.initialized) {
this.isWaitingForInitialization = true;
return false;
}
this.isWaitingForInitialization = false;
drawValueBox();
drawNeedle();
if (!imready) {
self.onready && self.onready();
cctx.scale(pxRatio, pxRatio);
cctx.save();
imready = true;
}
return true;
};
/**
* Draws the gauge. Normally this function should be used to
* initially draw the gauge
*/
this.draw = function () {
if (!cache.i8d) {
// clear the cache
cctx.clearRect(-CX, -CY, CW, CH);
cctx.save();
var tmp = { ctx: ctx };
//noinspection JSUnusedAssignment
ctx = cctx;
drawPlate();
drawHighlights();
drawMinorTicks();
drawMajorTicks();
drawNumbers();
drawTitle();
drawUnits();
cache.i8d = true;
ctx = tmp.ctx;
delete tmp.ctx;
}
// clear the canvas
ctx.clearRect(-CX, -CY, CW, CH);
ctx.save();
ctx.drawImage(cache, -CX, -CY, CW, CH);
this.drawWhenInitialized();
};
/**
* Transforms degrees to radians
*/
function radians(degrees) {
return degrees * Math.PI / 180;
}
/**
* Linear gradient
*/
function lgrad(clrFrom, clrTo, len) {
var grad = ctx.createLinearGradient(0, 0, 0, len);
grad.addColorStop(0, clrFrom);
grad.addColorStop(1, clrTo);
return grad;
}
function drawPlate() {
var
r0 = max / 100 * 93,
d0 = max - r0,
r1 = max / 100 * 91,
r2 = max / 100 * 88,
r3 = max / 100 * 85;
ctx.save();
if (config.glow) {
ctx.shadowBlur = d0;
ctx.shadowColor = config.colors.circle.shadow;
}
if (config.circles.outerVisible) {
ctx.beginPath();
ctx.arc(0, 0, r0, 0, Math.PI * 2, true);
ctx.fillStyle = lgrad(
config.colors.circle.outerStart,
config.colors.circle.outerEnd,
r0
);
ctx.fill();
}
ctx.restore();
if (config.circles.middleVisible) {
ctx.beginPath();
ctx.arc(0, 0, r1, 0, Math.PI * 2, true);
ctx.fillStyle = lgrad(
config.colors.circle.middleStart,
config.colors.circle.middleEnd,
r1
);
ctx.fill();
}
if (config.circles.innerVisible) {
ctx.beginPath();
ctx.arc(0, 0, r2, 0, Math.PI * 2, true);
ctx.fillStyle = lgrad(
config.colors.circle.innerStart,
config.colors.circle.innerEnd,
r2
);
ctx.fill();
}
ctx.beginPath();
ctx.arc(0, 0, r3, 0, Math.PI * 2, true);
ctx.fillStyle = config.colors.plate;
ctx.fill();
ctx.save();
}
/**
* Formats a number for display on the dial's plate using the majorTicksFormat config option.
*
* @param {number} num The number to format
* @returns {string} The formatted number
*/
function formatMajorTickNumber(num) {
var r, isDec = false;
// First, force the correct number of digits right of the decimal.
if (config.majorTicksFormat.dec === 0) {
r = Math.round(num).toString();
} else {
r = num.toFixed(config.majorTicksFormat.dec);
}
// Second, force the correct number of digits left of the decimal.
if (config.majorTicksFormat["int"] > 1) {
// Does this number have a decimal?
isDec = (r.indexOf('.') > -1);
// Is this number a negative number?
if (r.indexOf('-') > -1) {
return '-' + [
config.majorTicksFormat["int"] + config.majorTicksFormat.dec + 2 + (isDec ? 1 : 0) - r.length
].join('0') + r.replace('-', '');
} else {
return [
config.majorTicksFormat["int"] + config.majorTicksFormat.dec + 1 + (isDec ? 1 : 0) - r.length
].join('0') + r;
}
} else {
return r;
}
}
// major ticks draw
function drawMajorTicks() {
var r = max / 100 * 81;
var i = 0;
var tlen = config.majorTicks.length;
ctx.lineWidth = 2 * pxRatio;
ctx.strokeStyle = config.colors.majorTicks;
ctx.save();
if (tlen === 0) {
var numberOfDefaultTicks = 5;
var tickSize = (config.maxValue - config.minValue) / numberOfDefaultTicks;
for (; i < numberOfDefaultTicks; i++) {
config.majorTicks.push(formatMajorTickNumber(config.minValue + (tickSize * i)));
}
config.majorTicks.push(formatMajorTickNumber(config.maxValue));
}
i = 0;
for (; i < tlen; ++i) {
var a = config.startAngle + i * (config.ticksAngle / (tlen - 1));
ctx.rotate(radians(a));
ctx.beginPath();
ctx.moveTo(0, r);
ctx.lineTo(0, r - max / 100 * 15);
ctx.stroke();
ctx.restore();
ctx.save();
}
if (config.strokeTicks) {
ctx.rotate(radians(90));
ctx.beginPath();
ctx.arc(0, 0, r,
radians(config.startAngle),
radians(config.startAngle + config.ticksAngle),
false
);
ctx.stroke();
ctx.restore();
ctx.save();
}
}
// minor ticks draw
function drawMinorTicks() {
var r = max / 100 * 81;
ctx.lineWidth = 1 * pxRatio;
ctx.strokeStyle = config.colors.minorTicks;
ctx.save();
var len = config.minorTicks * (config.majorTicks.length - 1);
var i = 0;
for (; i < len; ++i) {
var a = config.startAngle + i * (config.ticksAngle / len);
ctx.rotate(radians(a));
ctx.beginPath();
ctx.moveTo(0, r);
ctx.lineTo(0, r - max / 100 * 7.5);
ctx.stroke();
ctx.restore();
ctx.save();
}
}
// tick numbers draw
function drawNumbers() {
var r = max / 100 * 55;
var points = {};
var i = 0;
var tlen = config.majorTicks.length;
for (; i < tlen; ++i) {
var
a = config.startAngle + i *
(config.ticksAngle / (tlen - 1)),
p = rpoint(r, radians(a));
if (a === 360) a = 0;
if (points[a]) {
continue; //already drawn at this place, skipping
}
points[a] = true;
ctx.font = 20 * (max / 200) + "px Arial";
ctx.fillStyle = config.colors.numbers;
ctx.lineWidth = 0;
ctx.textAlign = "center";
ctx.fillText(config.majorTicks[i], p.x, p.y + 3);
}
}
// title draw
function drawTitle() {
if (!config.title) {
return;
}
ctx.save();
ctx.font = 24 * (max / 200) + "px Arial";
ctx.fillStyle = config.colors.title;
ctx.textAlign = "center";
ctx.fillText(config.title, 0, -max / 4.25);
ctx.restore();
}
// units draw
function drawUnits() {
if (!config.units) {
return;
}
ctx.save();
ctx.font = 22 * (max / 200) + "px Arial";
ctx.fillStyle = config.colors.units;
ctx.textAlign = "center";
ctx.fillText(config.units, 0, max / 3.25);
ctx.restore();
}
function padValue(val) {
var
cdec = config.valueFormat['dec'],
cint = config.valueFormat['int'];
var i = 0, s;
val = parseFloat(val);
var n = (val < 0);
val = Math.abs(val);
if (cdec > 0) {
val = val.toFixed(cdec).toString().split('.');
s = cint - val[0].length;
for (; i < s; ++i) {
val[0] = '0' + val[0];
}
val = (n ? '-' : '') + val[0] + '.' + val[1];
}
else {
val = Math.round(val).toString();
s = cint - val.length;
for (; i < s; ++i) {
val = '0' + val;
}
val = (n ? '-' : '') + val
}
return val;
}
function rpoint(r, a) {
var
x = 0,
y = r,
sin = Math.sin(a),
cos = Math.cos(a),
X = x * cos - y * sin,
Y = x * sin + y * cos;
return {
x: X,
y: Y
};
}
// draws the highlight colors
function drawHighlights() {
ctx.save();
var r1 = max / 100 * 81;
var r2 = r1 - max / 100 * 15;
var i = 0, s = config.highlights.length;
for (; i < s; i++) {
var
hlt = config.highlights[i],
vd = (config.maxValue - config.minValue) / config.ticksAngle,
sa = radians(config.startAngle +
(hlt.from - config.minValue) / vd),
ea = radians(config.startAngle +
(hlt.to - config.minValue) / vd);
ctx.beginPath();
ctx.rotate(radians(90));
ctx.arc(0, 0, r1, sa, ea, false);
ctx.restore();
ctx.save();
var
ps = rpoint(r2, sa),
pe = rpoint(r1, sa);
ctx.moveTo(ps.x, ps.y);
ctx.lineTo(pe.x, pe.y);
var
ps1 = rpoint(r1, ea),
pe1 = rpoint(r2, ea);
ctx.lineTo(ps1.x, ps1.y);
ctx.lineTo(pe1.x, pe1.y);
ctx.lineTo(ps.x, ps.y);
ctx.closePath();
ctx.fillStyle = hlt.color;
ctx.fill();
ctx.beginPath();
ctx.rotate(radians(90));
ctx.arc(0, 0, r2, sa - 0.2, ea + 0.2, false);
ctx.restore();
ctx.closePath();
ctx.fillStyle = config.colors.plate;
ctx.fill();
ctx.save();
}
}
// drows the gauge needle
function drawNeedle() {
var
r1 = max / 100 * config.needle.circle.size,
r2 = max / 100 * config.needle.circle.size * 0.75,
rIn = max / 100 * config.needle.end,
rStart = config.needle.start ?
max / 100 * config.needle.start : 0,
rOut = max / 100 * 20,
pad1 = max / 100 * config.needle.width,
pad2 = max / 100 * config.needle.width / 2,
shad = function () {
ctx.shadowOffsetX = 2;
ctx.shadowOffsetY = 2;
ctx.shadowBlur = 10;
ctx.shadowColor = config.colors.needle.shadowDown;
};
shad();
ctx.save();
ctx.rotate(
radians(
config.startAngle + (fromValue-config.minValue) /
(config.maxValue - config.minValue) * config.ticksAngle
)
);
if (config.needle.type === 'arrow') {
ctx.beginPath();
ctx.moveTo(-pad2, -rOut);
ctx.lineTo(-pad1, 0);
ctx.lineTo(-1 * pxRatio, rIn);
ctx.lineTo(1 * pxRatio, rIn);
ctx.lineTo(pad1, 0);
ctx.lineTo(pad2, -rOut);
ctx.closePath();
ctx.fillStyle = lgrad(
config.colors.needle.start,
config.colors.needle.end,
rIn - rOut
);
ctx.fill();
ctx.beginPath();
ctx.lineTo(-0.5 * pxRatio, rIn);
ctx.lineTo(-1 * pxRatio, rIn);
ctx.lineTo(-pad1, 0);
ctx.lineTo(-pad2, -rOut);
ctx.lineTo(pad2 / 2 * pxRatio - 2 * pxRatio, -rOut);
ctx.closePath();
ctx.fillStyle = config.colors.needle.shadowUp;
ctx.fill();
}
else { // simple line needle
ctx.beginPath();
ctx.moveTo(-pad2, rIn);
ctx.lineTo(-pad2, rStart);
ctx.lineTo(pad2, rStart);
ctx.lineTo(pad2, rIn);
ctx.closePath();
ctx.fillStyle = lgrad(
config.colors.needle.start,
config.colors.needle.end,
rIn - rOut
);
ctx.fill();
}
ctx.restore();
if (config.needle.circle) {
shad();
if (config.needle.circle.outer) {
ctx.beginPath();
ctx.arc(0, 0, r1, 0, Math.PI * 2, true);
ctx.fillStyle = lgrad(
config.colors.needle.circle.outerStart,
config.colors.needle.circle.outerEnd,
r1
);
ctx.fill();
ctx.restore();
}
if (config.needle.circle.inner) {
ctx.beginPath();
ctx.arc(0, 0, r2, 0, Math.PI * 2, true);
ctx.fillStyle = lgrad(
config.colors.needle.circle.innerStart,
config.colors.needle.circle.innerEnd,
r2
);
ctx.fill();
}
}
}
function roundRect(x, y, w, h, r) {
ctx.beginPath();
ctx.moveTo(x + r, y);
ctx.lineTo(x + w - r, y);
ctx.quadraticCurveTo(x + w, y, x + w, y + r);
ctx.lineTo(x + w, y + h - r);
ctx.quadraticCurveTo(x + w, y + h, x + w - r, y + h);
ctx.lineTo(x + r, y + h);
ctx.quadraticCurveTo(x, y + h, x, y + h - r);
ctx.lineTo(x, y + r);
ctx.quadraticCurveTo(x, y, x + r, y);
ctx.closePath();
}
// value box draw
function drawValueBox() {
if (!config.valueText.visible) {
return;
}
ctx.save();
ctx.font = 40 * (max / 200) + "px Led";
var
text = padValue(value),
y = max - max / 100 * 33,
x = 0;
ctx.save();
if (config.valueBox.visible) {
var
th = 0.12 * max,
tw = ctx.measureText('-' + padValue(0)).width;
roundRect(-tw / 2 - 0.025 * max,
y - th - 0.04 * max,
tw + 0.05 * max,
th + 0.07 * max,
0.025 * max
);
}
var grd = ctx.createRadialGradient(
x,
y - 0.12 * max - 0.025 * max + (0.12 * max + 0.045 * max) / 2,
max / 10,
x,
y - 0.12 * max - 0.025 * max + (0.12 * max + 0.045 * max) / 2,
max / 5
);
grd.addColorStop(0, config.colors.valueBox.rectStart);
grd.addColorStop(1, config.colors.valueBox.rectEnd);
ctx.strokeStyle = grd;
ctx.lineWidth = 0.05 * max;
ctx.stroke();
ctx.shadowBlur = 0.012 * max;
ctx.shadowColor = config.colors.valueBox.shadow;