dat.gui/controllers/scrubber.js

// Would really love to make it so that as FEW changes as possible are required to gui.js in order to make this work. Would love to make it so you simply include gui.scrubber.min.js in addition to gui.min.js. 

GUI.Controller.prototype.at = function(when, what, tween) {
	this.scrubber.add(new GUI.ScrubberPoint(this.scrubber, when, what));
	this.scrubber.render();
	return this;
}

GUI.Scrubber = function(controller, timer) {	

	var _this = this;

	this.points = [];
	this.timer = timer;
	this.controller = controller;
	this.controller.scrubber = this;
	this.playing = false;
	
	this.sort = function() {
		this.points.sort(function(a,b) {
			return a.time - b.time;
		});
	}
	
	this.add = function(p) {
		this.points.push(p);
		this.sort();
	}
	
	this.controller.addChangeListener(function(newVal) {
	if (!_this.playing) {
		if (_this.timer.activePoint == null) {
			console.log(_this, _this.timer.playhead, newVal);
			_this.timer.activePoint = new GUI.ScrubberPoint(_this, _this.timer.playhead, newVal);
			_this.render();
		} else { 
			_this.timer.activePoint.value = newVal;
		}
	}
	});

	this.domElement = document.createElement('div');
	this.domElement.setAttribute('class', 'guidat-time');

	var canvas = document.createElement('canvas');
	this.domElement.appendChild(canvas);
	
	this.g = canvas.getContext('2d');
	
	var width;
	var position;
	var height;
	
	this.__defineGetter__("width", function() {
		return width;
	});
	
	this.__defineGetter__("height", function() {
		return height;
	});
	
	controller.domElement.insertBefore(this.domElement, controller.propertyNameElement.nextSibling);
	
	
	this.render = function() {
	
		// TODO: if visible ...
		_this.g.clearRect(0, 0, width, height);
		
		for (var i in _this.points) {
			_this.points[i].render();
		}
		
		// Draw playhead
		
		_this.g.strokeStyle = "red";
		_this.g.lineWidth = 1;
		var t = Math.round(GUI.map(_this.timer.playhead, _this.timer.windowMin, _this.timer.windowMin+_this.timer.windowWidth, 0, width))+0.5;
		_this.g.beginPath();
		_this.g.moveTo(t, 0);
		_this.g.lineTo(t, height);
		_this.g.stroke();
		
	}
	
	this.render();
	

	
	var onResize = function() {
		canvas.width = width = _this.domElement.offsetWidth;
		canvas.height = height = _this.domElement.offsetHeight;
		position = GUI.getOffset(canvas);
		_this.render();
	};
	
	window.addEventListener('resize', function(e) {
		onResize();
	}, false);
	
	var scrub = function(e) {
		var t = GUI.map(e.pageX, position.left, position.left+width, _this.timer.windowMin, _this.timer.windowMin+_this.timer.windowWidth);
		_this.timer.playhead = t;
	}
	
	canvas.addEventListener('mousedown', function(e) {
		if (_this.timer.hoverPoint != null) {

			_this.timer.activePoint = _this.timer.hoverPoint;
			_this.timer.playhead = _this.timer.activePoint.time;

		} else { 
		
			_this.timer.activePoint = null;
			scrub(e);
			document.body.style.cursor = "text";
			document.addEventListener('mousemove', scrub, false);
			_this.render();
			
		}
		
	}, false);
	
	canvas.addEventListener('mousemove', function(e) {
		_this.timer.hoverPoint = null;
		for (var i in _this.points) {
			var cur = _this.points[i];
			if (cur.isHovering(e.pageX-position.left)) {
				_this.timer.hoverPoint = cur;
			}
		}
		_this.render();
	});
	
	document.addEventListener('mouseup', function() {
		document.body.style.cursor = "auto";
		document.removeEventListener('mousemove', scrub, false);
	}, false);
	

	
	onResize();

	this.timer.addPlayListener(this.render);
	
	var onPlayChange = function(curTime, prevTime) {
		
		_this.playing = true;
		
		// This assumes a SORTED point array
		// And a PROGRESSING/INCREASING/GROWING playhead
		
		if (_this.controller.type == "number") {
		
			var closestToLeft = null;
			for (var i = 0; i < _this.points.length; i++) {
				var cur = _this.points[i];
				if (cur.time >= curTime && i > 0) {
					closestToLeft = _this.points[i-1];
					break;
				}
			}
			
			if (closestToLeft == null || closestToLeft.time > curTime) return;
			
			var n = closestToLeft.next;
			if (n != null) {
				
				// Interpolate.
				var t = GUI.map(curTime, closestToLeft.time, n.time, 0, 1);
				t = closestToLeft.tween(t);
				var val = GUI.map(t, 0, 1, closestToLeft.value, n.value);
				_this.controller.setValue(val);
				
			}
			
			
		} else { 
			
			for (var i = 0; i < _this.points.length; i++) {
				var cur = _this.points[i];
				
				if (cur.time < prevTime) {
					continue;
				}
							
				if (cur.time >= prevTime && cur.time <= curTime) {
					pointHandlers[_this.controller.type].call(_this, cur);
				}
						
			}	
		
		}
		
		_this.playing = false;
		
	};
	
	var pointHandlers = {
	
		'function': function(point) {	
			this.controller.getValue().call(this);
		}, 
		
		'boolean': function(point) {
			this.controller.setValue(point.value);
		},
		
		'string': function(point) {
			this.controller.setValue(point.value);
		},
		
	}
	
	this.timer.addPlayListener(onPlayChange);
	
	this.timer.addWindowListener(this.render);
	
	
};

GUI.ScrubberPoint = function(scrubber, time, value) {
	
	var _this = this;
	
		
	var g = scrubber.g;
	var timer = scrubber.timer;
	var type = scrubber.controller.type;
	var x, y;
	
	this.hold = false;
	
	this.value = value;

	var barSize = 4;
	var rectSize = 7;
	
	var c1 = "#ffd800";
	var c2 = "#ff9000";
	
	this.tween = function(t) {
		return t;
	};
	
	this.isHovering = function(xx) {
		return xx >= x-rectSize/2 && xx <= x+rectSize/2;
	};
	
	this.__defineGetter__("next", function() {	
		if (scrubber.points.length <= 1) {
			return null;
		}
		
		var i = scrubber.points.indexOf(this);
		if (i + 1 >= scrubber.points.length) {
			return null;
		}
		
		return scrubber.points[i+1];
		
	});
	
	this.__defineGetter__("time", function() {
		return time;
	});
	
	this.render = function() {
	
		x = GUI.map(time, timer.windowMin, timer.windowMin+timer.windowWidth, 0, 1);

		if (x >= 0 && x <= 1) {
			x = Math.round(GUI.map(x, 0, 1, 0, scrubber.width));
		}
		
		y = scrubber.height/2;

		switch (type) {
		
			case "number":
			
				g.save();
				var n = this.next;
				
				if (n != null) {
							
					var nx = GUI.constrain(GUI.map(n.time, timer.windowMin, timer.windowMin+timer.windowWidth, 0, 1));
	
					if (nx >= 0 && nx <= 1) {
						nx = Math.round(GUI.map(nx, 0, 1, 0, scrubber.width));
					}
					
					g.lineWidth = rectSize/2
					g.strokeStyle="#222";
					g.beginPath();
					g.moveTo(nx, y);
					g.lineTo(x, y);
					g.stroke();
					
					
				}		
				
				g.translate(x, y);
				g.rotate(Math.PI/4);
				g.fillStyle = c1;
				g.fillRect(-rectSize/2, -rectSize/2, rectSize, rectSize);
				g.restore();
						
				break;
		
			default:	
				g.save();
				g.translate(x-barSize/2, 0);
				if (scrubber.timer.activePoint == this) {
					g.fillStyle = "red"; //
				} else if (scrubber.timer.hoverPoint == this) {
					g.fillStyle = "green";
				} else { 
					g.fillStyle = "blue";
				}
				//g.fillStyle = c1;
				g.fillRect(0, 0, barSize/2, scrubber.height-1);
				//g.fillStyle = c2;
				g.fillRect(barSize/2, 0, barSize/2, scrubber.height-1);
				g.restore();
		
		}
		
	}
	
}