forked from ilikecats/papercats
461 lines
12 KiB
JavaScript
461 lines
12 KiB
JavaScript
var Stack;
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if (!Stack)
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throw new Error("Require stack.js");
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var Tail = (function() {
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var CELL_WIDTH = 30;
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var GRID_SIZE = 200;
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function TailMove(orientation)
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{
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this.move = 1;
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Object.defineProperty(this, "orientation", {
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value: orientation,
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enumerable: true
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});
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}
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function Tail(player)
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{
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var data = {
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tail: [],
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tailGrid: [],
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prev: null,
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startRow: 0,
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startCol: 0,
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prevRow: 0,
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prevCol: 0,
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player: player
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};
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this.addTail = addTail.bind(this, data);
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this.hitsTail = hitsTail.bind(this, data);
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this.fillTail = fillTail.bind(this, data);
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this.render = render.bind(this, data);
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this.move = move.bind(this, data);
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Object.defineProperty(this, "moves", {
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get: function() {return data.tail.slice(0);},
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enumerable: true
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});
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}
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//Instance methods.
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function setTailGrid(data, tailGrid, r, c)
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{
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if (!tailGrid[r])
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tailGrid[r] = [];
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tailGrid[r][c] = true;
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}
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function addTail(data, orientation)
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{
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var prev = data.prev;
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var r = data.prevRow, c = data.prevCol;
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if (data.tail.length === 0)
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setTailGrid(data, data.tailGrid, r, c);
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if (!prev || prev.orientation !== orientation)
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{
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prev = data.prev = new TailMove(orientation);
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data.tail.push(prev);
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}
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else
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prev.move++;
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var pos = walk([data.prevRow, data.prevCol], null, orientation, 1);
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data.prevRow = pos[0];
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data.prevCol = pos[1];
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setTailGrid(data, data.tailGrid, pos[0], pos[1]);
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}
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function move(data, row, col)
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{
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data.prevRow = data.startRow = row;
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data.prevCol = data.startCol = col;
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data.prev = null;
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if (data.tail.length === 0)
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return;
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else
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{
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var ret = data.tail;
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data.tail = [];
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data.tailGrid = [];
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return ret;
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}
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}
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function render2(data, ctx)
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{
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ctx.fillStyle = data.player.tailColor;
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for (var r = 0; r < data.tailGrid.length; r++)
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{
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if (!data.tailGrid[r])
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continue;
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for (var c = 0; c < data.tailGrid[r].length; c++)
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if (data.tailGrid[r][c])
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ctx.fillRect(c * CELL_WIDTH, r * CELL_WIDTH, CELL_WIDTH, CELL_WIDTH);
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}
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}
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function render(data, ctx)
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{
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ctx.fillStyle = data.player.tailColor;
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var prevOrient = -1;
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var start = [data.startRow, data.startCol];
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fillTailRect(ctx, start, start);
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data.tail.forEach(function(tail) {
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var negDir = tail.orientation === 0 || tail.orientation === 3;
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var back = start;
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if (!negDir)
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start = walk(start, null, tail.orientation, 1);
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var finish = walk(start, null, tail.orientation, tail.move - 1);
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if (tail.move > 1)
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fillTailRect(ctx, start, finish);
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if (prevOrient !== -1)
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//Draw folding triangle.
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renderCorner(ctx, back, prevOrient, tail.orientation);
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start = finish;
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if (negDir)
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walk(start, start, tail.orientation, 1);
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prevOrient = tail.orientation;
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});
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var curOrient = data.player.currentHeading;
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if (prevOrient === curOrient)
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{
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fillTailRect(ctx, start, start);
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}
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else
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renderCorner(ctx, start, prevOrient, curOrient);
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}
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function renderCorner(ctx, cornerStart, dir1, dir2)
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{
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if (dir1 === 0 || dir2 === 0)
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walk(cornerStart, cornerStart, 2, 1);
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if (dir1 === 3 || dir2 === 3)
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walk(cornerStart, cornerStart, 1, 1);
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var a = walk(cornerStart, null, dir2, 1);
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var b = walk(a, null, dir1, 1);
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var triangle = new Path2D();
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triangle.moveTo(cornerStart[1] * CELL_WIDTH, cornerStart[0] * CELL_WIDTH);
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triangle.lineTo(a[1] * CELL_WIDTH, a[0] * CELL_WIDTH);
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triangle.lineTo(b[1] * CELL_WIDTH, b[0] * CELL_WIDTH);
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triangle.closePath();
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for (var i = 0; i < 2; i++)
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ctx.fill(triangle);
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}
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function walk(from, ret, orient, dist)
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{
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ret = ret || [];
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ret[0] = from[0];
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ret[1] = from[1];
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switch (orient)
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{
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case 0: ret[0] -= dist; break; //UP
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case 1: ret[1] += dist; break; //RIGHT
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case 2: ret[0] += dist; break; //DOWN
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case 3: ret[1] -= dist; break; //LEFT
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}
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return ret;
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}
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function fillTailRect(ctx, start, end)
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{
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var x = start[1] * CELL_WIDTH;
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var y = start[0] * CELL_WIDTH;
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var width = (end[1] - start[1]) * CELL_WIDTH;
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var height = (end[0] - start[0]) * CELL_WIDTH;
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if (width === 0)
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width += CELL_WIDTH;
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if (height === 0)
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height += CELL_WIDTH;
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if (width < 0)
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{
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x += width;
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width = -width;
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}
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if (height < 0)
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{
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y += height;
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height = -height;
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}
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ctx.fillRect(x, y, width, height);
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}
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//TODO: fade in colors using grid property-getters/setters
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function fillTail(data, grid)
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{
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if (data.tail.length === 0)
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return;
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function onTail(c) { return data.tailGrid[c[0]] && data.tailGrid[c[0]][c[1]]; }
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var start = [data.startRow, data.startCol];
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var been = new Array(grid.length);
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var coords = [];
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coords.push(start);
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while (coords.length > 0) //BFS for all tail spaces.
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{
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var coord = coords.shift();
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var r = coord[0];
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var c = coord[1];
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if (r < 0 || c < 0 || r >= grid.length || c >= grid[r].length)
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continue; //Out of bounds!
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if (been[r] && been[r][c])
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continue;
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if (onTail(coord)) //on the tail.
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{
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if (!been[r])
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been[r] = new Array(grid[r].length);
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been[r][c] = true;
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grid[r][c] = data.player;
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//Find all spots that this tail encloses.
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floodFill(data, grid, r + 1, c, been);
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floodFill(data, grid, r - 1, c, been);
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floodFill(data, grid, r, c + 1, been);
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floodFill(data, grid, r, c - 1, been);
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coords.push([r + 1, c]);
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coords.push([r - 1, c]);
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coords.push([r, c + 1]);
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coords.push([r, c - 1]);
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}
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}
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}
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function floodFill(data, grid, row, col, been)
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{
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var coords = [];
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var filled = new Stack(40000);
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var surrounded = true;
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function onTail(c) { return data.tailGrid[c[0]] && data.tailGrid[c[0]][c[1]]; }
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coords.push([row, col]);
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while (coords.length > 0)
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{
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var coord = coords.shift();
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var r = coord[0];
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var c = coord[1];
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if (r < 0 || c < 0 || r >= grid.length || c >= grid[r].length)
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{
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surrounded = false;
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continue; //Out of bounds!
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}
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//End this traverse on boundaries (where we been, on the tail, and when we enter our territory)
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if ((been[r] && been[r][c]) || onTail(coord) || grid[r][c] === data.player)
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continue;
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if (!been[r])
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been[r] = new Array(grid[r].length);
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been[r][c] = true;
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if (surrounded)
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filled.push(coord);
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coords.push([r + 1, c]);
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coords.push([r - 1, c]);
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coords.push([r, c + 1]);
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coords.push([r, c - 1]);
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}
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if (surrounded)
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{
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while (!filled.isEmpty())
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{
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coord = filled.pop();
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grid[coord[0]][coord[1]] = data.player;
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}
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}
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return surrounded;
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}
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function hitsTail(data, other)
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{
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return (data.prevRow !== other.row || data.prevCol !== other.col) &&
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!!(data.tailGrid[other.row] && data.tailGrid[other.row][other.col]);
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}
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return Tail;
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}());
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this.Player = (function() {
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var CELL_WIDTH = 30;
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var SPEED = 5;
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var SHADOW_OFFSET = 10;
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function Player(socket, grid, num) {
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var data = {};
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//TODO: load player data and color.
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var hue = Math.random();
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var base = hslToRgb(hue, .8, .5);
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this.baseColor = rgbString(base);
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this.shadowColor = rgbString(hslToRgb(hue, .8, .2));
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base[3] = .5;
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this.tailColor = rgbaString(base);
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this.name = 'Player ' + (num + 1);
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data.grid = grid;
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data.curHeading = 2;
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data.row = Math.floor(Math.random() * 10) + 10;
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data.col = 10;//num;
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data.dead = false;
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data.tail = new Tail(this);
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data.tail.move(data.row, data.col);
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//Positions
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this.heading = 0; //0 is up, 1 is right, 2 is down, 3 is left.
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this.posX = data.col * CELL_WIDTH;
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this.posY = data.row * CELL_WIDTH;
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this.move = move.bind(this, data);
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this.die = function() {data.dead = true;};
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//Properties.
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Object.defineProperties(this, {
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currentHeading: defineGetter(function() {return data.curHeading;}),
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dead: defineGetter(function() {return !!data.dead;}),
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row: defineGetter(function() {return data.row;}),
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col: defineGetter(function() {return data.col;}),
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num: defineGetter(function() {return num;}),
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tail: defineGetter(function() {return data.tail;}),
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});
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}
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//Instance methods
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Player.prototype.render = function(ctx)
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{
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//Render tail.
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this.tail.render(ctx);
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//Render player.
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ctx.fillStyle = this.shadowColor;
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ctx.fillRect(this.posX, this.posY, CELL_WIDTH, CELL_WIDTH);
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var mid = CELL_WIDTH / 2;
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var grd = ctx.createRadialGradient(this.posX + mid, this.posY + mid - SHADOW_OFFSET, 1,
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this.posX + mid, this.posY + mid - SHADOW_OFFSET, CELL_WIDTH);
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grd.addColorStop(0, this.baseColor);
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grd.addColorStop(1, "white");
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ctx.fillStyle = grd;
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ctx.fillRect(this.posX, this.posY - SHADOW_OFFSET, CELL_WIDTH, CELL_WIDTH);
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};
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function move(data)
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{
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//Move to new position.
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var heading = this.heading;
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var row = Math.floor(this.posY / CELL_WIDTH);
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var col = Math.floor(this.posX / CELL_WIDTH);
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if (this.posX % CELL_WIDTH !== 0 || this.posY % CELL_WIDTH !== 0)
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heading = data.curHeading;
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switch (heading)
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{
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case 0: //UP
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this.posY -= SPEED;
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row = Math.floor(this.posY / CELL_WIDTH);
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break;
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case 1: //RIGHT
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this.posX += SPEED;
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col = Math.ceil(this.posX / CELL_WIDTH);
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break;
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case 2: //DOWN
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this.posY += SPEED;
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row = Math.ceil(this.posY / CELL_WIDTH);
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break;
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case 3: //LEFT
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this.posX -= SPEED;
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col = Math.floor(this.posX / CELL_WIDTH);
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}
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//Update front position.
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data.row = row;
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data.col = col;
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if (row < 0 || row > data.grid.length || col < 0 || col > data.grid[row].length)
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{
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data.dead = true;
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return;
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}
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if (data.grid[row][col] === this)
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{
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//Safe zone!
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this.tail.fillTail(data.grid);
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this.tail.move(row, col);
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}
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//If we are completely in a new cell (not in our safe zone), we add to the tail.
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else if (this.posX % CELL_WIDTH === 0 && this.posY % CELL_WIDTH === 0)
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{
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this.tail.addTail(heading);
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}
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data.curHeading = heading;
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}
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//Helper methods.
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function defineGetter(getter) {
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return {
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get: getter,
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enumerable: true
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};
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}
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//http://stackoverflow.com/a/9493060/7344257
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function hslToRgb(h, s, l){
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var r, g, b;
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if(s == 0){
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r = g = b = l; // achromatic
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}else{
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var hue2rgb = function hue2rgb(p, q, t){
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if(t < 0) t += 1;
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if(t > 1) t -= 1;
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if(t < 1/6) return p + (q - p) * 6 * t;
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if(t < 1/2) return q;
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if(t < 2/3) return p + (q - p) * (2/3 - t) * 6;
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return p;
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};
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var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
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var p = 2 * l - q;
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r = hue2rgb(p, q, h + 1/3);
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g = hue2rgb(p, q, h);
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b = hue2rgb(p, q, h - 1/3);
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}
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return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
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}
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function rgbString(rgb) {
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return 'rgb(' + rgb[0] + ', ' + rgb[1] + ', ' + rgb[2] + ')';
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}
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function rgbaString(rgb) {
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return 'rgba(' + rgb[0] + ', ' + rgb[1] + ', ' + rgb[2] + ', ' + rgb[3] + ')';
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}
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return Player;
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})(); |