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billiards.js
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billiards.js
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function inheritPrototype(childObj, parentObj) {
/* Douglas Crockford parasitic object inheritance */
var cParent = Object.create(parentObj.prototype);
cParent.constructor = childObj;
childObj.prototype = cParent;
}
function contains2D(array, element) {
for (var i = 0; i < array.length; i++) {
if (array[i][0] == element[0] && array[i][1] == element[1])
return true;
}
return false;
}
var Elements = {
HWALL: 0,
VWALL: 1,
ARG: 2,
RESULT: 3,
SOURCE: 4,
SINK: 5,
ENABLER: 6,
REMOVER: 7,
HTML: 8
}
var Ex = {
INFO: 0,
PLANAR: 1,
SWITCH: 2,
AND: 3,
NOT: 4,
FANOUT: 5,
FREDKIN: 6
}
function StatArea() {
/* A StatArea (singleton) specifies properties of the stat region */
this.x = 0;
this.y = 0;
this.w = $(".leftArea").width();
this.h = $(window).height();
this.padding = 10;
this.div = d3.select(".leftArea")
.append("div")
.classed("statArea", true);
this._text = this.div.append("p")
.classed("text", true);
this._text.html(["time: " + 0,
"running: " + false,
"continuous mode: " + "off"
].join("<br>"));
this._configbox = this.div.append("textarea")
.attr("onfocus", "this.select()");
this.div.append("p")
.classed("text", true)
.text("Copy this to save your program!");
this.div.append("hr");
this.div.append("p")
.classed("text", true)
.text("examples");
this.div.append("a")
.classed("text", true)
.text("info")
.on("click", function () { Examples.load(Ex.INFO); });
this.div.append("a")
.classed("text", true)
.text("planar")
.on("click", function () { Examples.load(Ex.PLANAR); });
this.div.append("a")
.classed("text", true)
.text("switch")
.on("click", function () { Examples.load(Ex.SWITCH); });
this.div.append("a")
.classed("text", true)
.text("and")
.on("click", function () { Examples.load(Ex.AND); });
this.div.append("a")
.classed("text", true)
.text("not")
.on("click", function () { Examples.load(Ex.NOT); });
this.div.append("a")
.classed("text", true)
.text("fanout")
.on("click", function () { Examples.load(Ex.FANOUT); });
this.div.append("a")
.classed("text", true)
.text("fredkin")
.on("click", function () { Examples.load(Ex.FREDKIN); });
}
StatArea.prototype = {
constructor: StatArea,
updateText: function () {
this._text.html(["time: " + State.time,
"running: " + State.running,
"continuous mode: " + (State.continuousTime ? "on" : "off")
].join("<br>"));
}
}
StatArea = new StatArea();
function DescArea() {
/* A DescArea (singleton) specifies properties of the description region */
this.x = 0;
this.y = 0;
this.w = $(".rightArea").width();
this.h = $(window).height();
this.padding = 10;
var rightArea = d3.select(".rightArea");
this._desc = rightArea.append("div")
.classed("descTitleArea", true)
.attr("height", "400px")
.append("p")
.classed("text", true);
this._descbox = rightArea.append("textarea")
.on("input", (function (self) {
return function() {
Metastate.updateConfigbox();
self._desc.html(self._descbox[0][0].value);
};
})(this));
rightArea.append("p")
.classed("text", true)
.text("Type a description here");
}
DescArea.prototype = {
constructor: DescArea
}
DescArea = new DescArea();
function DrawingArea() {
/* A DrawingArea (singleton) specifies properties of the drawable region */
this.x = StatArea.w; // Left
this.y = 0; // Top
this.w = $(window).width() - 30 - $(".rightArea").width() - this.x; // Width (in px)
this.h = $(window).height() - 10; // Height (in px)
this._svg = d3.select("body")
.append("svg")
.attr("width", this.w)
.attr("height", this.h)
.attr("style", "left: " + this.x + "px");
this.svg = this._svg.append("g")
.attr("width", this.w)
.attr("height", this.h);
this.svg.append("rect")
.attr("x", 0)
.attr("y", 0)
.attr("width", this.w)
.attr("height", this.h)
.style("fill", "white");
this.svg.on("mousemove", function (e) {
Metastate.updateGhost(d3.mouse(this)[0], d3.mouse(this)[1]);
});
this.svg.on("click", function (e) {
switch (Metastate.selected) {
case Elements.HWALL:
case Elements.VWALL:
case Elements.ARG:
case Elements.RESULT:
case Elements.SOURCE:
case Elements.SINK:
case Elements.HTML:
Metastate.addElement(d3.mouse(this)[0], d3.mouse(this)[1]);
break;
case Elements.ENABLER:
Metastate.toggleElement(d3.mouse(this)[0], d3.mouse(this)[1]);
break;
case Elements.REMOVER:
Metastate.removeElement(d3.mouse(this)[0], d3.mouse(this)[1]);
break;
}
});
}
DA = new DrawingArea();
function Drawable() {
/* A Drawable object has an 'initialize' property that creates HTML elements onto
* the <body> and a 'redraw' property that updates these elements. */
}
Drawable.prototype = {
constructor: Drawable,
initialize: function() {},
redraw: function() {}
}
function Grid() {
/* A Grid (singleton) is a type of Drawable that draws a grid */
this.tickCount = 26;
this.minTickCount = 10;
this.maxTickCount = 50;
this.xAxisGrid = null;
this.yAxisGrid = null;
this.svgXLines = null;
this.svgYLines = null;
}
inheritPrototype(Grid, Drawable)
Grid.prototype = {
constructor: Grid,
initialize: function() {
// Axes
var scale = d3.scale.linear()
.domain([-1, 1])
.range([-1, 1]);
var xAxis = d3.svg.axis()
.scale(scale)
.tickFormat("")
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(scale)
.tickFormat("")
.orient("right");
this.xAxisGrid = xAxis
.tickSize(DA.h)
.tickValues(d3.range(0, DA.w, this.getTickSize()));
this.yAxisGrid = yAxis
.tickSize(DA.w)
.tickValues(d3.range(0, DA.h, this.getTickSize()));
this.svgXLines = DA.svg.append("g")
.classed("grid", true)
.call(this.xAxisGrid);
this.svgYLines = DA.svg.append("g")
.classed("grid", true)
.call(this.yAxisGrid);
},
redraw: function() {
this.xAxisGrid
.tickValues(d3.range(0, DA.w, this.getTickSize()));
this.yAxisGrid
.tickValues(d3.range(0, DA.h, this.getTickSize()));
this.svgXLines
.call(this.xAxisGrid);
this.svgYLines
.call(this.yAxisGrid);
},
zoomIn: function() {
if (this.tickCount > this.minTickCount)
this.tickCount--;
},
zoomOut: function() {
if (this.tickCount < this.maxTickCount)
this.tickCount++;
},
getTickSize: function() {
/* Return the size of grid squares (in pixels) */
var m = Math.min(DA.w, DA.h);
return m / this.tickCount;
},
getDrawPos: function(x, y) {
/* Converts grid coordinates to drawable coordinates */
return [x * this.getTickSize(), y * this.getTickSize()];
},
getGridPos: function(x, y) {
/* Converts drawable coordinates to grid coordinates */
return [Math.round(x / this.getTickSize()), Math.round(y / this.getTickSize())];
},
getGridPosFloor: function(x, y) {
/* Converts drawable coordinates to grid coordinates (rounding down) */
return [Math.floor(x / this.getTickSize()), Math.floor(y / this.getTickSize())];
},
getGridPosNoround: function(x, y) {
/* Converts drawable coordinates to grid coordinates (without rounding) */
return [x / this.getTickSize(), y / this.getTickSize()];
},
snapToGrid: function(x, y) {
return this.getDrawPos.apply(this, this.getGridPos(x, y));
},
snapToGridFloor: function(x, y) {
return this.getDrawPos.apply(this, this.getGridPosFloor(x, y));
}
}
Grid = new Grid();
function Configuration() {
/* A Configuration maintains a list of positions that define
* the starting state of a program */
this.hwalls = [];
this.vwalls = [];
this.sources = [];
this.sinks = [];
this.args = [];
this.results = [];
this.htmls = [];
}
Configuration.prototype = {
constructor: Configuration,
addHtml: function (x, y, h) {
this.htmls.push([x, y, h]);
},
addHWall: function (x, y) {
if (contains2D(this.hwalls, [x, y]))
return;
this.hwalls.push([x, y]);
},
addVWall: function (x, y) {
if (contains2D(this.vwalls, [x, y]))
return;
this.vwalls.push([x, y]);
},
addSource: function (x, y) {
if (contains2D(this.sources, [x, y]))
return;
this.sources.push([x, y, true]);
},
addSink: function (x, y) {
if (contains2D(this.sinks, [x, y]))
return;
this.sinks.push([x, y]);
},
addArgument: function (x, y) {
if (contains2D(this.args, [x, y]))
return;
this.args.push([x, y, true]);
},
addResult: function (x, y) {
if (contains2D(this.results, [x, y]))
return;
this.results.push([x, y]);
},
toString: function () {
return JSON.stringify([this.hwalls, this.vwalls, this.sources, this.sinks, this.args, this.results, this.htmls, DescArea._descbox[0][0].value]);
},
fromString: function (str) {
var pr = JSON.parse(str);
this.hwalls = pr[0];
this.vwalls = pr[1];
this.sources = pr[2];
this.sinks = pr[3];
this.args = pr[4];
this.results = pr[5];
this.htmls = pr[6];
DescArea._descbox[0][0].value = pr[7];
}
}
function Metastate() {
/* A Metastate (singleton) handles all the information about the current user's
* settings; i.e. currently selected element */
this.selected = null;
this._ghost = null;
this._svgs = [];
}
Metastate.prototype = {
constructor: Metastate,
initialize: function () {
this._ghost = DA.svg.append("svg");
},
updateGhost: function (mx, my) {
if (this._ghost != null) {
this._ghost.remove();
}
if (this.selected != null) {
switch (this.selected) {
case Elements.VWALL:
this._ghost = VWallSprite.constructSVG.apply(this, Grid.snapToGridFloor(mx, my));
break;
case Elements.HWALL:
this._ghost = HWallSprite.constructSVG.apply(this, Grid.snapToGridFloor(mx, my));
break;
case Elements.ARG:
this._ghost = ArgSprite.constructSVG.apply(this, Grid.snapToGrid(mx, my));
break;
case Elements.RESULT:
this._ghost = ResSprite.constructSVG.apply(this, Grid.snapToGrid(mx, my));
break;
case Elements.SOURCE:
this._ghost = SourceSprite.constructSVG.apply(this, Grid.snapToGrid(mx, my));
break;
case Elements.SINK:
this._ghost = SinkSprite.constructSVG.apply(this, Grid.snapToGrid(mx, my));
break;
}
}
},
addElement: function (mx, my) {
switch (this.selected) {
case Elements.HTML:
var h = prompt("Enter text");
if (h)
State.config.addHtml.apply(State.config, Grid.getGridPosNoround(mx, my).concat(h));
break;
case Elements.VWALL:
State.config.addVWall.apply(State.config, Grid.getGridPosFloor(mx, my));
break;
case Elements.HWALL:
State.config.addHWall.apply(State.config, Grid.getGridPosFloor(mx, my));
break;
case Elements.ARG:
State.config.addArgument.apply(State.config, Grid.getGridPos(mx, my));
break;
case Elements.RESULT:
State.config.addResult.apply(State.config, Grid.getGridPos(mx, my));
break;
case Elements.SOURCE:
State.config.addSource.apply(State.config, Grid.getGridPos(mx, my));
break;
case Elements.SINK:
State.config.addSink.apply(State.config, Grid.getGridPos(mx, my));
break;
}
this.updateSVGs();
this.updateConfigbox();
},
toggleElement: function (mx, my) {
var pos = Grid.getGridPos(mx, my);
for (var i = 0; i < State.config.args.length; i++) {
var arg = State.config.args[i];
if (arg[0] == pos[0] && arg[1] == pos[1]) {
arg[2] = !arg[2];
this.updateSVGs();
this.updateConfigbox();
return;
}
}
for (var i = 0; i < State.config.sources.length; i++) {
var src = State.config.sources[i];
if (src[0] == pos[0] && src[1] == pos[1]) {
src[2] = !src[2];
this.updateSVGs();
this.updateConfigbox();
return;
}
}
},
removeElement: function (mx, my) {
// Explicitly remove HTML by rounding
var mpos = Grid.getGridPosNoround(mx, my);
var arr = State.config.htmls;
for (var i = 0; i < arr.length; i++) {
var x = arr[i];
if (Math.sqrt(Math.pow(x[0] - mpos[0], 2) + Math.pow(x[1] - mpos[1], 2)) < 1) {
arr.splice(i, 1);
this.updateSVGs();
this.updateConfigbox();
return;
}
}
var pos = Grid.getGridPos(mx, my);
var elementArrays = [State.config.args,
State.config.results,
State.config.sources,
State.config.sinks,
State.config.hwalls,
State.config.vwalls];
for (var j = 0; j < elementArrays.length; j++) {
var arr = elementArrays[j];
for (var i = 0; i < arr.length; i++) {
var x = arr[i];
if (x[0] == pos[0] && x[1] == pos[1]) {
arr.splice(i, 1);
this.updateSVGs();
this.updateConfigbox();
return;
}
}
}
},
updateSVGs: function () {
this._svgs.forEach(function (svg) {
svg.remove();
});
this._svgs = [];
// Redraw everything
State.config.htmls.forEach(function (posH) {
var svg = HTMLSprite.constructSVG.apply(this, Grid.getDrawPos(posH[0], posH[1]).concat(posH[2]));
this._svgs.push(svg);
}, this);
State.config.hwalls.forEach(function (pos) {
this._svgs.push(HWallSprite.constructSVG.apply(this, Grid.getDrawPos(pos[0], pos[1])));
}, this);
State.config.vwalls.forEach(function (pos) {
this._svgs.push(VWallSprite.constructSVG.apply(this, Grid.getDrawPos(pos[0], pos[1])));
}, this);
State.config.sources.forEach(function (posEn) {
var svg = SourceSprite.constructSVG.apply(this, Grid.getDrawPos(posEn[0], posEn[1]));
if (!posEn[2]) {
svg.style("stroke-opacity", 0.5);
}
this._svgs.push(svg);
}, this);
State.config.sinks.forEach(function (pos) {
this._svgs.push(SinkSprite.constructSVG.apply(this, Grid.getDrawPos(pos[0], pos[1])));
}, this);
State.config.args.forEach(function (posEn) {
var svg = ArgSprite.constructSVG.apply(this, Grid.getDrawPos(posEn[0], posEn[1]));
if (!posEn[2]) {
svg.style("stroke-opacity", 0.5);
svg.__caption.text("0");
}
else {
svg.__caption.text("1");
}
this._svgs.push(svg);
}, this);
State.config.results.forEach(function (pos) {
var svg = ResSprite.constructSVG.apply(this, Grid.getDrawPos(pos[0], pos[1]));
svg.__caption.text("0");
for (var i = 0; i < State.balls.length; i++) {
var ball = State.balls[i];
if (ball.x == pos[0] && ball.y == pos[1]) {
svg.__caption.text("1");
break;
}
}
this._svgs.push(svg);
}, this);
},
load: function(jsonStr) {
if (!jsonStr)
jsonStr = prompt("Paste your JSON!");
if (jsonStr) {
State.stop();
State.config.fromString(jsonStr);
this.updateSVGs();
this.updateConfigbox();
DescArea._desc.html(DescArea._descbox[0][0].value);
}
},
updateConfigbox: function() {
StatArea._configbox.text(State.config.toString());
}
}
Metastate = new Metastate();
function Sprite() {
/* A Sprite supports a constructSVG function that returns an SVG generator */
}
Sprite.prototype = {
constructor: Sprite,
constructSVG: function () {}
}
function HTMLSprite() {}
inheritPrototype(HTMLSprite, Sprite);
HTMLSprite.prototype = {
constructor: HTMLSprite,
constructSVG: function (x, y, h) {
var svg = DA.svg.append("g");
svg.append("line")
.attr("x1", x - Grid.getTickSize() * 1 / 8)
.attr("x2", x + Grid.getTickSize() * 1 / 8)
.attr("y1", y)
.attr("y2", y)
.attr("stroke-width", 1)
.attr("stroke", "black")
.attr("shape-rendering", "crispEdges");
svg.append("line")
.attr("x1", x)
.attr("x2", x)
.attr("y1", y - Grid.getTickSize() * 1 / 8)
.attr("y2", y + Grid.getTickSize() * 1 / 8)
.attr("stroke-width", 1)
.attr("stroke", "black")
.attr("shape-rendering", "crispEdges");
svg.append("text")
.attr("x", x + 2)
.attr("y", y + 2 - Grid.getTickSize() * 1 / 4)
.attr("text-anchor", "middle")
.attr("fill", "white")
.classed("text", true)
.attr("shape-rendering", "crispEdges")
.text(h);
svg.append("text")
.attr("x", x)
.attr("y", y - Grid.getTickSize() * 1 / 4)
.attr("text-anchor", "middle")
.classed("text", true)
.attr("shape-rendering", "crispEdges")
.text(h);
return svg;
}
}
HTMLSprite = new HTMLSprite();
function BallSprite() {}
inheritPrototype(BallSprite, Sprite);
BallSprite.prototype = {
constructor: BallSprite,
constructSVG: function (x, y) {
var svg = DA.svg.append("g");
svg
.append("circle")
.attr("cx", x)
.attr("cy", y)
.attr("r", Grid.getTickSize() / 2)
.style("fill", "transparent")
.attr("stroke", "black");
return svg;
}
}
function ArgSprite() {}
inheritPrototype(ArgSprite, BallSprite);
ArgSprite.prototype = {
constructor: ArgSprite,
constructSVG: function (x, y) {
var svg = BallSprite.constructSVG(x, y);
svg.append("line")
.attr("x1", x - Grid.getTickSize() * 5 / 8)
.attr("x2", x + Grid.getTickSize() * 5 / 8)
.attr("y1", y + Grid.getTickSize() * 5 / 8)
.attr("y2", y - Grid.getTickSize() * 5 / 8)
.attr("stroke-width", 1)
.attr("stroke", "black");
svg.append("line")
.attr("x1", x)
.attr("x2", x + Grid.getTickSize() * 5 / 8)
.attr("y1", y - Grid.getTickSize() * 5 / 8)
.attr("y2", y - Grid.getTickSize() * 5 / 8)
.attr("stroke-width", 1)
.attr("stroke", "black");
svg.append("line")
.attr("x1", x + Grid.getTickSize() * 5 / 8)
.attr("x2", x + Grid.getTickSize() * 5 / 8)
.attr("y1", y)
.attr("y2", y - Grid.getTickSize() * 5 / 8)
.attr("stroke-width", 1)
.attr("stroke", "black");
svg.__caption = svg.append("text")
.attr("x", x + Grid.getTickSize() / 2)
.attr("y", y + Grid.getTickSize() / 2)
.classed("text", true)
.text("1");
return svg;
}
}
function ResSprite() {}
inheritPrototype(ResSprite, BallSprite);
ResSprite.prototype = {
constructor: ResSprite,
constructSVG: function (x, y) {
var svg = BallSprite.constructSVG(x, y);
svg
.append("circle")
.attr("cx", x)
.attr("cy", y)
.attr("r", Grid.getTickSize() * 3 / 8)
.style("fill", "transparent")
.style("stroke", "black");
svg.__caption = svg.append("text")
.attr("x", x + Grid.getTickSize() / 2)
.attr("y", y + Grid.getTickSize() / 2)
.classed("text", true)
.text("0");
return svg;
}
}
function SourceSprite() {}
inheritPrototype(SourceSprite, BallSprite);
SourceSprite.prototype = {
constructor: SourceSprite,
constructSVG: function (x, y) {
var svg = BallSprite.constructSVG(x, y);
svg.append("line")
.attr("x1", x + Grid.getTickSize() * 5 / 8)
.attr("x2", x - Grid.getTickSize() * 5 / 8)
.attr("y1", y + Grid.getTickSize() * 5 / 8)
.attr("y2", y - Grid.getTickSize() * 5 / 8)
.attr("stroke-width", 1)
.attr("stroke", "black");
svg.append("line")
.attr("x1", x + Grid.getTickSize() * 5 / 8)
.attr("x2", x)
.attr("y1", y + Grid.getTickSize() * 5 / 8)
.attr("y2", y + Grid.getTickSize() * 5 / 8)
.attr("stroke-width", 1)
.attr("stroke", "black");
svg.append("line")
.attr("x1", x + Grid.getTickSize() * 5 / 8)
.attr("x2", x + Grid.getTickSize() * 5 / 8)
.attr("y1", y)
.attr("y2", y + Grid.getTickSize() * 5 / 8)
.attr("stroke-width", 1)
.attr("stroke", "black");
return svg;
}
}
function SinkSprite() {}
inheritPrototype(SinkSprite, BallSprite);
SinkSprite.prototype = {
constructor: SinkSprite,
constructSVG: function (x, y) {
var svg = BallSprite.constructSVG(x, y);
svg.append("line")
.attr("x1", x - Grid.getTickSize() / 2)
.attr("x2", x + Grid.getTickSize() / 2)
.attr("y1", y + Grid.getTickSize() / 2)
.attr("y2", y - Grid.getTickSize() / 2)
.attr("stroke-width", 1)
.attr("stroke", "black");
svg.append("line")
.attr("x1", x + Grid.getTickSize() / 2)
.attr("x2", x - Grid.getTickSize() / 2)
.attr("y1", y + Grid.getTickSize() / 2)
.attr("y2", y - Grid.getTickSize() / 2)
.attr("stroke-width", 1)
.attr("stroke", "black");
return svg;
}
}
BallSprite = new BallSprite();
ArgSprite = new ArgSprite();
ResSprite = new ResSprite();
SourceSprite = new SourceSprite();
SinkSprite = new SinkSprite();
function HWallSprite() {}
inheritPrototype(HWallSprite, Sprite);
HWallSprite.prototype = {
constructor: HWallSprite,
constructSVG: function (x, y) {
var svg = DA.svg.append("line")
.attr("x1", x)
.attr("x2", x + Grid.getTickSize())
.attr("y1", y)
.attr("y2", y)
.attr("stroke-width", 3)
.attr("stroke", "black")
.attr("shape-rendering", "crispEdges");
return svg;
}
}
HWallSprite = new HWallSprite();
function VWallSprite() {}
inheritPrototype(VWallSprite, Sprite);
VWallSprite.prototype = {
constructor: VWallSprite,
constructSVG: function (x, y) {
var svg = DA.svg.append("line")
.attr("x1", x)
.attr("x2", x)
.attr("y1", y)
.attr("y2", y + Grid.getTickSize())
.attr("stroke-width", 3)
.attr("stroke", "black")
.attr("shape-rendering", "crispEdges");
return svg;
}
}
VWallSprite = new VWallSprite();
function RealBallSprite() {}
inheritPrototype(RealBallSprite, Sprite);
RealBallSprite.prototype = {
constructor: RealBallSprite,
constructSVG: function (x, y) {
var svg = DA.svg.append("g");
svg
.append("circle")
.attr("cx", x)
.attr("cy", y)
.attr("r", Grid.getTickSize() / 2)
.style("fill", "transparent")
.attr("stroke", "black")
.attr("stroke-width", 3);
return svg;
}
}
RealBallSprite = new RealBallSprite();
function State(config) {
/* A State (singleton) is the current information of the world
* Keeps track of all Ball objects */
this.config = config;
this.balls = [];
this.running = false;
this.time = 0;
this.continuousTime = false;
this._svgBalls = [];
this._interval = null;
}
State.prototype = {
constructor: State,
start: function () {
this.balls = [];
// Initialize balls at arguments
this.config.args.forEach(function (pos) {
if (pos[2])
this.balls.push(new Ball(pos[0], pos[1], 1, -1));
}, this);
// Initialize balls at sources
this.config.sources.forEach(function (pos) {
if (pos[2])
this.balls.push(new Ball(pos[0], pos[1], 1, 1));
}, this);
// Redraw balls
this.balls.forEach(function (ball) {
this._svgBalls.push(RealBallSprite.constructSVG.apply(this, Grid.getDrawPos(ball.x, ball.y)));
}, this);
// Update element texts
Metastate.updateSVGs();
this.running = true;
this.continuousTime = false;
this.time = 0;
this._interval = setInterval((function (self) {
return function () {
if (self.running && self.continuousTime) {
self.step();
StatArea.updateText();
}
}
})(this), 50);
},
run: function () {
this.continuousTime = true;
this.running = true;
},
pause: function () {
this.continuousTime = !this.continuousTime;
},
step: function () {
if (this.running) {
this.balls.forEach(function (ball) {
// First, check for trivial collisions with walls
// This is only a problem if we are in half-step
if (Math.floor(ball.x) != ball.x || Math.floor(ball.y) != ball.y) {
if (contains2D(this.config.vwalls, [ball.x + 0.5 * ball.dx, ball.y - 0.5]))
ball.dx *= -1;
if (contains2D(this.config.hwalls, [ball.x - 0.5, ball.y + 0.5 * ball.dy]))
ball.dy *= -1;
}
}, this);
// Check for collisions with other balls
for (var i = 0; i < this.balls.length; i++) {
var myBall = this.balls[i];
for (var j = i + 1; j < this.balls.length; j++) {
var otherBall = this.balls[j];
// If balls are colliding horizontally
if (myBall.dx == otherBall.dx * -1) {
if (myBall.x + myBall.dx == otherBall.x && myBall.y == otherBall.y) {
myBall.dx *= -1;
otherBall.dx *= -1;
}
}
// If balls are colliding vertically
if (myBall.dy == otherBall.dy * -1 && myBall.x == otherBall.x) {
if (myBall.y + myBall.dy == otherBall.y) {
myBall.dy *= -1;
otherBall.dy *= -1;
}
}
}
}
// Propagate motion
this.balls.forEach(function (ball) {
ball.x += ball.dx * 0.5;
ball.y += ball.dy * 0.5;
});
// Check for results
this.config.results.forEach(function (res) {
this.balls.forEach(function (ball) {
if (ball.x == res[0] && ball.y == res[1]) {
// Found a result! Freeze the program
this.continuousTime = false;
}
}, this);
}, this);
// Redraw all balls
this._svgBalls.forEach(function (svg) {
svg.remove();
});
this._svgBalls = [];
this.balls.forEach(function (ball) {
this._svgBalls.push(RealBallSprite.constructSVG.apply(this, Grid.getDrawPos(ball.x, ball.y)));
}, this);
this.time += 0.5;
Metastate.updateSVGs();
}
},
stepBack: function () {
if (this.running && this.time > 0) {
// Check for results
this.config.results.forEach(function (res) {
this.balls.forEach(function (ball) {
if (ball.x == res[0] && ball.y == res[1]) {
// Found a result! Freeze the program
this.continuousTime = false;
}
}, this);
}, this);
// Propagate motion
this.balls.forEach(function (ball) {
ball.x -= ball.dx * 0.5;
ball.y -= ball.dy * 0.5;
});
// Check for collisions with other balls
for (var i = 0; i < this.balls.length; i++) {
var myBall = this.balls[i];
for (var j = i + 1; j < this.balls.length; j++) {
var otherBall = this.balls[j];
// If balls are colliding horizontally
if (myBall.dx == otherBall.dx * -1) {
if (myBall.x - myBall.dx == otherBall.x && myBall.y == otherBall.y) {
myBall.dx *= -1;
otherBall.dx *= -1;
}
}
// If balls are colliding vertically
if (myBall.dy == otherBall.dy * -1) {
if (myBall.y - myBall.dy == otherBall.y && myBall.x == otherBall.x) {
myBall.dy *= -1;
otherBall.dy *= -1;
}
}
}
}
this.balls.forEach(function (ball) {
// First, check for trivial collisions with walls
// This is only a problem if we are in half-step
if (Math.floor(ball.x) != ball.x || Math.floor(ball.y) != ball.y) {
if (contains2D(this.config.vwalls, [ball.x - 0.5 * ball.dx, ball.y - 0.5]))
ball.dx *= -1;
if (contains2D(this.config.hwalls, [ball.x - 0.5, ball.y + 0.5 - ball.dy]))
ball.dy *= -1;
}
}, this);
// Redraw all balls
this._svgBalls.forEach(function (svg) {
svg.remove();
});
this._svgBalls = [];
this.balls.forEach(function (ball) {
this._svgBalls.push(RealBallSprite.constructSVG.apply(this, Grid.getDrawPos(ball.x, ball.y)));
}, this);
this.time -= 0.5;
Metastate.updateSVGs();
}
},
stop: function () {
if (this.running) {
this.running = false;
this.continuousTime = false;
this.time = 0;
this.balls = [];
if (this._interval) {
clearInterval(this._interval);
}
this._svgBalls.forEach(function (svg) {
svg.remove();
});
this._svgBalls = [];
Metastate.updateSVGs();
}
}
}
State = new State(new Configuration());
function Ball(x, y, dx, dy) {
/* A Ball is a Drawable that stores position and momentum
* position and momentum are stored as grid coordinates
* */
this.x = x;
this.y = y;
this.dx = dx;
this.dy = dy;
}
inheritPrototype(Ball, Drawable);
Ball.prototype = {
constructor: Ball,
initialize: function() {
},
redraw: function() {
}
}
Grid.initialize();
function Examples () {}
Examples.prototype = {
constructor: Examples,
load: function (ex) {
switch (ex) {
case Ex.INFO: