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CanvasDrawing.js
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CanvasDrawing.js
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/*
CanvasDrawing.coffee
Joshua Marshall Moore
12/18/2011
*/
var CanvasDrawing, MarkMaker;
var __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };
MarkMaker = (function() {
function MarkMaker(range, nowX, nowT, minX, maxX) {
this.range = range;
this.nowX = nowX;
this.nowT = nowT;
this.minX = minX;
this.maxX = maxX;
this.timePerPixel = this.scale(this.prescale(this.range.value));
this.minT = -1 * ((this.timePerPixel * (this.nowX - this.minX)) - this.nowT);
this.maxT = -1 * ((this.timePerPixel * (this.nowX - this.maxX)) - this.nowT);
}
MarkMaker.prototype.prescale = function(val) {
var retval;
if (val > 69) {
retval = 69;
} else {
retval = val;
}
return retval;
};
MarkMaker.prototype.scale = function(rangeValue) {
var maxIn, maxOut, minIn, minOut, msPerSecond, msPerYear, scale;
minIn = this.range.min;
maxIn = this.range.max;
msPerSecond = 1000;
msPerYear = 1000 * 60 * 60 * 24 * 365;
minOut = Math.log(msPerSecond);
maxOut = Math.log(msPerYear);
scale = (maxOut - minOut) / (maxIn - minIn);
return Math.exp(minOut + scale * (rangeValue - minIn));
};
/*
converts a given time t into a position x, as long as @minT <= t <= @maxT
*/
MarkMaker.prototype.tToX = function(t) {
return Math.floor(-1 * (((this.nowT - t) / this.timePerPixel) - this.nowX));
};
/*
makeMarks iterates over the range [first(minT), maxT], using the
t+=nextIncrement(t) function to create values for which the predicate(t)
function decides whether to create a mark or not.
first(t):
calculates the first time step from the previously calculated @minT.
nextIncrement(t):
give t calculates the next iteration of t.
classifier(t):
returns a string indicating whether the supplied time is a full hour,
day, week, or month
The output is an array of {t, x} objects.
*/
MarkMaker.prototype.makeMarks = function(first, nextIncrement, classifier) {
var mark, results, t;
results = new Array();
t = first(this.minT);
while (t <= this.maxT) {
mark = {
t: t,
x: this.tToX(t),
"class": classifier(t)
};
results.push(mark);
t = nextIncrement(t);
}
return results;
};
MarkMaker.prototype.rangeTtoRangeX = function(dt) {
return dt / this.timePerPixel;
};
/*
Given the first and nextIncrement function used in the makeMarkers function,
as well as a minimum value for the distance between two marks, this fucntion
returns true if two markers distance is more or equal to the minimum distance,
and false otherwise.
*/
MarkMaker.prototype.testSettings = function(first, nextIncrement, minDistance) {
var x, x2;
x = this.tToX(first(this.minT));
x2 = this.tToX(nextIncrement(this.minT));
return (x2 - x) >= minDistance;
};
return MarkMaker;
})();
CanvasDrawing = (function() {
function CanvasDrawing(canvasID, rangeID) {
this.draw = __bind(this.draw, this); this.canvas = document.getElementById(canvasID);
this.range = document.getElementById(rangeID);
this.context = this.canvas.getContext("2d");
this.lineY = 5 / 8 * this.canvas.height;
this.nowX = 100;
this.firstMinute = function(t) {
var msPerMinute;
msPerMinute = 1000 * 60;
return Math.floor(t / msPerMinute) * msPerMinute;
};
this.nextMinute = function(currentMinute) {
var msPerMinute;
msPerMinute = 1000 * 60;
return currentMinute + msPerMinute;
};
this.firstHour = function(t) {
var msPerHour;
msPerHour = 1000 * 60 * 60;
return Math.floor(t / msPerHour) * msPerHour;
};
this.nextHour = function(currentHour) {
var msPerHour;
msPerHour = 1000 * 60 * 60;
return currentHour + msPerHour;
};
this.firstDay = function(minT) {
var d, msPerHour, t;
msPerHour = 1000 * 60 * 60;
t = Math.floor(minT / msPerHour) * msPerHour;
d = new Date(t);
while (d.getHours() !== 0) {
t += msPerHour;
d.setTime(t);
}
return t;
};
this.nextDay = function(currentDay) {
var msPerDay, t;
msPerDay = 1000 * 60 * 60 * 24;
return t = currentDay + msPerDay;
};
this.firstMonth = function(minT) {
var d, msPerDay, t;
msPerDay = 1000 * 60 * 60 * 24;
t = Math.floor(minT / msPerDay) * msPerDay;
d = new Date(t);
while (d.getDate() !== 1) {
t += msPerDay;
d.setTime(t);
}
return t;
};
this.nextMonth = function(currentMonth) {
var d, msPerDay, t;
msPerDay = 1000 * 60 * 60 * 24;
t = currentMonth + msPerDay * 27;
d = new Date(t);
while (d.getDate() !== 1) {
t += msPerDay;
d.setTime(t);
}
return t;
};
this.classifier = function(t) {
var c, d, msPerDay, msPerHour, msPerMinute;
msPerMinute = 1000 * 60;
msPerHour = 1000 * 60 * 60;
msPerDay = 1000 * 60 * 60 * 24;
d = new Date(t);
if (t % msPerMinute === 0) c = "minute";
if (t % msPerHour === 0) c = "hour";
if (d.getHours() === 0 && t % msPerHour === 0) c = "day";
if (d.getDay() === 0 && d.getHours() === 0) c = "week";
if (d.getDate() === 1) c = "month";
if (d.getMonth() === 0 && d.getDate() === 1 && d.getHours() === 0) {
c = "year";
}
return c;
};
this.fitToWindow();
$(window).resize(this.fitToWindow);
}
CanvasDrawing.prototype.getNowX = function() {
return this.nowX;
};
CanvasDrawing.prototype.setNowX = function(val) {
return this.nowX = val;
};
CanvasDrawing.prototype.getCanvas = function() {
return this.canvas;
};
CanvasDrawing.prototype.drawLine = function() {
this.context.moveTo(0, this.lineY);
this.context.lineTo(this.canvas.width, this.lineY);
this.context.closePath();
this.context.stroke();
return true;
};
CanvasDrawing.prototype.drawTick = function(x, length) {
this.context.beginPath();
this.context.moveTo(x, this.lineY - length / 2);
this.context.lineTo(x, this.lineY + length / 2);
this.context.closePath();
this.context.stroke();
return true;
};
CanvasDrawing.prototype.classToTickmarkLength = function(c) {
var len;
if (c === "minute") len = 10;
if (c === "hour") len = 15;
if (c === "day") len = 20;
if (c === "week") len = 25;
if (c === "month") len = 30;
if (c === "year") len = 35;
if (c === "now") len = 50;
return len;
};
CanvasDrawing.prototype.monthNtoString = function(n) {
var str;
if (n === 0) str = "January";
if (n === 1) str = "February";
if (n === 2) str = "March";
if (n === 3) str = "April";
if (n === 4) str = "May";
if (n === 5) str = "June";
if (n === 6) str = "July ";
if (n === 7) str = "August";
if (n === 8) str = "September";
if (n === 9) str = "October";
if (n === 10) str = "November";
if (n === 11) str = "December";
return str;
};
CanvasDrawing.prototype.labelTickmark = function(mark) {
var d, hour, minute, text;
this.context.font = "10px sans-serif";
d = new Date(mark.t);
if (mark["class"] === "minute") {
minute = d.getMinutes();
text = minute.toString();
}
if (mark["class"] === "hour") {
hour = d.getHours();
text = hour.toString();
}
if (mark["class"] === "day" || mark["class"] === "week") {
text = (d.getMonth() + 1).toString() + "/" + d.getDate().toString();
}
if (mark["class"] === "month") text = this.monthNtoString(d.getMonth());
if (mark["class"] === "year") {
text = d.getFullYear().toString() + "\n" + this.monthNtoString(d.getMonth());
}
if (mark["class"] === "now") {
text = d.getHours().toString() + ":";
if (d.getMinutes() < 10) {
text += "0" + d.getMinutes();
} else {
text += d.getMinutes();
}
}
return this.context.fillText(text, mark.x, this.lineY + this.classToTickmarkLength(mark["class"]));
};
CanvasDrawing.prototype.draw = function() {
var border, i, markMaker, marks, minTickmarkDistance, now, nowMark;
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
this.drawLine();
now = new Date();
border = 50;
markMaker = new MarkMaker(this.range, this.nowX, now.getTime(), border, this.canvas.width - border);
minTickmarkDistance = 10;
if (markMaker.testSettings(this.firstMinute, this.nextMinute, minTickmarkDistance)) {
marks = markMaker.makeMarks(this.firstMinute, this.nextMinute, this.classifier);
} else if (markMaker.testSettings(this.firstHour, this.nextHour, minTickmarkDistance)) {
marks = markMaker.makeMarks(this.firstHour, this.nextHour, this.classifier);
} else if (markMaker.testSettings(this.firstDay, this.nextDay, minTickmarkDistance)) {
marks = markMaker.makeMarks(this.firstDay, this.nextDay, this.classifier);
} else if (markMaker.testSettings(this.firstMonth, this.nextMonth, minTickmarkDistance)) {
marks = markMaker.makeMarks(this.firstMonth, this.nextMonth, this.classifier);
} else {
marks = [];
}
nowMark = {
x: this.nowX,
t: now.getTime(),
"class": "now"
};
this.drawTick(nowMark.x, this.classToTickmarkLength(nowMark["class"]));
this.labelTickmark(nowMark);
i = 0;
while (i < marks.length) {
this.drawTick(marks[i].x, this.classToTickmarkLength(marks[i]["class"]));
this.labelTickmark(marks[i]);
i++;
}
return true;
};
CanvasDrawing.prototype.fitToWindow = function() {
this.canvas.height = $(window).height();
this.canvas.width = $(window).width();
this.lineY = 5 / 8 * this.canvas.height;
return true;
};
CanvasDrawing.prototype.test = function() {
var i, markMaker, marks;
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
markMaker = new MarkMaker(this.range, 100, (new Date()).getTime(), 50, this.canvas.width - 50);
marks = markMaker.makeMarks(this.firstMonth, this.nextMonth, this.classifier);
$("#output").text(marks.length);
i = 0;
while (i < marks.length) {
this.drawTick(marks[i].x, this.classToTickmarkLength(marks[i]["class"]));
this.labelTickmark(marks[i]);
i++;
}
return true;
};
return CanvasDrawing;
})();
window.Timeline = (function() {
function Timeline(canvasID, sliderID) {
this.start = __bind(this.start, this); this.canvasDrawing = new CanvasDrawing(canvasID, sliderID);
}
Timeline.prototype.start = function() {
var interval;
return interval = setInterval(this.canvasDrawing.draw, 60);
};
return Timeline;
})();