232 lines
6.5 KiB
JavaScript
232 lines
6.5 KiB
JavaScript
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function mixin(obj1, obj2) {
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for(var i in obj2) {
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if(obj2.hasOwnProperty(i)) {
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obj1[i] = obj2[i];
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}
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}
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};
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function EventEmitter() {
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this._events = {};
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};
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EventEmitter.prototype.on = function(evtn, fn) {
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if(!this._events.hasOwnProperty(evtn)) this._events[evtn] = [];
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this._events[evtn].push(fn);
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};
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EventEmitter.prototype.off = function(evtn, fn) {
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if(!this._events.hasOwnProperty(evtn)) return;
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var idx = this._events[evtn].indexOf(fn);
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if(idx < 0) return;
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this._events[evtn].splice(idx, 1);
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};
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EventEmitter.prototype.emit = function(evtn) {
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if(!this._events.hasOwnProperty(evtn)) return;
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var fns = this._events[evtn].slice(0);
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if(fns.length < 1) return;
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var args = Array.prototype.slice.call(arguments, 1);
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for(var i = 0; i < fns.length; i++) fns[i].apply(this, args);
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};
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function hashFnv32a(str, asString, seed) {
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/*jshint bitwise:false */
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var i, l,
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hval = (seed === undefined) ? 0x811c9dc5 : seed;
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for (i = 0, l = str.length; i < l; i++) {
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hval ^= str.charCodeAt(i);
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hval += (hval << 1) + (hval << 4) + (hval << 7) + (hval << 8) + (hval << 24);
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}
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if( asString ){
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// Convert to 8 digit hex string
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return ("0000000" + (hval >>> 0).toString(16)).substr(-8);
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}
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return hval >>> 0;
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}
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function round(number, increment, offset) {
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return Math.round((number - offset) / increment ) * increment + offset;
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}
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// knob
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var Knob = function(canvas, min, max, step, value, name, unit) {
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EventEmitter.call(this);
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this.min = min || 0;
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this.max = max || 10;
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this.step = step || 0.01;
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this.value = value || this.min;
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this.knobValue = (this.value - this.min) / (this.max - this.min);
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this.name = name || "";
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this.unit = unit || "";
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var ind = step.toString().indexOf(".");
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if(ind == -1) ind = step.toString().length - 1;
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this.fixedPoint = step.toString().substr(ind).length - 1;
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this.dragY = 0;
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this.mouse_over = false;
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this.canvas = canvas;
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this.ctx = canvas.getContext("2d");
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// knob image
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this.radius = this.canvas.width * 0.3333;
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this.baseImage = document.createElement("canvas");
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this.baseImage.width = canvas.width;
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this.baseImage.height = canvas.height;
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var ctx = this.baseImage.getContext("2d");
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ctx.fillStyle = "#444";
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ctx.shadowColor = "rgba(0, 0, 0, 0.5)";
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ctx.shadowBlur = 5;
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ctx.shadowOffsetX = this.canvas.width * 0.02;
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ctx.shadowOffsetY = this.canvas.width * 0.02;
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ctx.beginPath();
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ctx.arc(this.canvas.width / 2, this.canvas.height /2, this.radius,
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0, Math.PI * 2);
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ctx.fill();
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// events
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var self = this;
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var dragging = false;
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// dragging
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(function() {
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function mousemove(evt) {
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if(evt.screenY !== self.dragY) {
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var delta = -(evt.screenY - self.dragY);
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var scale = 0.0075;
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if(evt.ctrlKey) scale *= 0.05;
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self.setKnobValue(self.knobValue + delta * scale);
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self.dragY = evt.screenY;
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self.redraw();
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}
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evt.preventDefault();
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showTip();
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}
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function mouseout(evt) {
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if(evt.toElement === null && evt.relatedTarget === null) {
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mouseup();
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}
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}
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function mouseup() {
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document.removeEventListener("mousemove", mousemove);
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document.removeEventListener("mouseout", mouseout);
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document.removeEventListener("mouseup", mouseup);
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self.emit("release", self);
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dragging = false;
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if(!self.mouse_over) removeTip();
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}
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canvas.addEventListener("mousedown", function(evt) {
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var pos = self.translateMouseEvent(evt);
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if(self.contains(pos.x, pos.y)) {
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dragging = true;
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self.dragY = evt.screenY;
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showTip();
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document.addEventListener("mousemove", mousemove);
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document.addEventListener("mouseout", mouseout);
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document.addEventListener("mouseup", mouseup);
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}
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});
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canvas.addEventListener("keydown", function(evt) {
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if(evt.keyCode == 38) {
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self.setValue(self.value + self.step);
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showTip();
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} else if(evt.keyCode == 40) {
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self.setValue(self.value - self.step);
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showTip();
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}
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});
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})();
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// tooltip
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function showTip() {
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var div = document.getElementById("tooltip");
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if(!div) {
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div = document.createElement("div");
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document.body.appendChild(div);
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div.id = "tooltip";
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var rect = self.canvas.getBoundingClientRect();
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div.style.left = rect.left + "px";
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div.style.top = rect.bottom + "px";
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}
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div.textContent = self.name;
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if(self.name) div.textContent += ": ";
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div.textContent += self.valueString() + self.unit;
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}
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function removeTip() {
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var div = document.getElementById("tooltip");
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if(div) {
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div.parentElement.removeChild(div);
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}
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}
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function ttmousemove(evt) {
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var pos = self.translateMouseEvent(evt);
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if(self.contains(pos.x, pos.y)) {
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self.mouse_over = true;
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showTip();
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} else {
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self.mouse_over = false;
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if(!dragging) removeTip();
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}
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}
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function ttmouseout(evt) {
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self.mouse_over = false;
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if(!dragging) removeTip();
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}
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self.canvas.addEventListener("mousemove", ttmousemove);
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self.canvas.addEventListener("mouseout", ttmouseout);
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this.redraw();
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}
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mixin(Knob.prototype, EventEmitter.prototype);
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Knob.prototype.redraw = function() {
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var dot_distance = 0.28 * this.canvas.width;
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var dot_radius = 0.03 * this.canvas.width;
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this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
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this.ctx.drawImage(this.baseImage, 0, 0);
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var a = this.knobValue;
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a *= Math.PI * 2 * 0.8;
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a += Math.PI / 2;
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a += Math.PI * 2 * 0.1;
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var half_width = this.canvas.width / 2;
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var x = Math.cos(a) * dot_distance + half_width;
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var y = Math.sin(a) * dot_distance + half_width;
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this.ctx.fillStyle = "#fff";
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this.ctx.beginPath();
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this.ctx.arc(x, y, dot_radius, 0, Math.PI * 2);
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this.ctx.fill();
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};
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Knob.prototype.setKnobValue = function(value) {
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if(value < 0) value = 0;
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else if(value > 1) value = 1;
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this.knobValue = value;
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this.setValue(value * (this.max - this.min) + this.min);
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};
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Knob.prototype.setValue = function(value) {
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var old = value;
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value = round(value, this.step, this.min);
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if(value < this.min) value = this.min;
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else if(value > this.max) value = this.max;
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if(this.value !== value) {
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this.value = value;
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this.knobValue = (value - this.min) / (this.max - this.min);
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this.redraw();
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this.emit("change", this);
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}
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};
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Knob.prototype.valueString = function() {
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return this.value.toFixed(this.fixedPoint);
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};
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Knob.prototype.contains = function(x, y) {
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x -= this.canvas.width / 2;
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y -= this.canvas.height / 2;
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return Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)) < this.radius;
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};
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Knob.prototype.translateMouseEvent = function(evt) {
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var element = evt.target;
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return {
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x: (evt.clientX - element.getBoundingClientRect().left - element.clientLeft + element.scrollLeft),
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y: evt.clientY - (element.getBoundingClientRect().top - element.clientTop + element.scrollTop)
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}
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};
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