霓虹六角

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/* because me lazy */
Object.getOwnPropertyNames(Math).map(function(p) {
	window[p] = Math[p];
});

var HEX_CRAD = 32, 
		HEX_BG = '#171717', 
		HEX_HL = '#2a2a2a', 
		HEX_HLW = 2, 
		HEX_GAP = 4, 
		NEON_PALETE = [
			'#cb3301', '#ff0066', 
			'#ff6666', '#feff99', 
			'#ffff67', '#ccff66', 
			'#99fe00', '#fe99ff', 
			'#ff99cb', '#fe349a', 
			'#cc99fe', '#6599ff', 
			'#00ccff', '#ffffff'
		], 
		T_SWITCH = 64, 
		
		unit_x = 3*HEX_CRAD + HEX_GAP*sqrt(3), 
		unit_y = HEX_CRAD*sqrt(3)*.5 + .5*HEX_GAP, 
		off_x = 1.5*HEX_CRAD + HEX_GAP*sqrt(3)*.5, 
		
		/* extract a work palette */
		wp = NEON_PALETE.map(function(c) {
			var num = parseInt(c.replace('#', ''), 16);
			
			return {
				'r': num >> 16 & 0xFF, 
				'g': num >> 8 & 0xFF, 
				'b': num & 0xFF
			};
		}), 
		nwp = wp.length, csi = 0, 
		
		f = 1/T_SWITCH, 
		
		c = document.querySelectorAll('canvas'), 
		n = c.length, w, h, _min, 
		ctx = [], 
		grid, source = null, 
		t = 0, request_id = null;

var GridItem = function(x, y) {
	this.x = x || 0;
	this.y = y || 0;
	this.points = { 'hex': [], 'hl': [] };
	
	this.init = function() {
		var x, y, a, ba = PI/3, 
				ri = HEX_CRAD - .5*HEX_HLW;
		
		for(var i = 0; i < 6; i++) {
			a = i*ba;
			x = this.x + HEX_CRAD*cos(a);
			y = this.y + HEX_CRAD*sin(a);
			
			this.points.hex.push({
				'x': x, 
				'y': y
			});
			
			if(i > 2) {
				x = this.x + ri*cos(a);
				y = this.y + ri*sin(a);
				
				this.points.hl.push({
					'x': x, 
					'y': y
				});
			}
		}
	};
	
	this.draw  = function(ct) {
		for(var i = 0; i < 6; i++) {
			ct[(i === 0?'move':'line')+ 'To'](
				this.points.hex[i].x, 
				this.points.hex[i].y
			);
		}
	};
	
	this.highlight = function(ct) {
		for(var i = 0; i < 3; i++) {
			ct[(i === 0?'move':'line')+ 'To'](
				this.points.hl[i].x, 
				this.points.hl[i].y
			);
		}
	};
	
	this.init();
};

var Grid = function(rows, cols) {
	this.cols = cols || 16;
	this.rows = rows || 16;
	this.items = [];
	this.n = this.items.length;
	
	this.init = function() {
		var x, y;
		
		for(var row = 0; row < this.rows; row++) {
			y = row*unit_y;
			
			for(var col = 0; col < this.cols; col++) {
				x = ((row%2 == 0)?0:off_x) + col*unit_x;
				
				this.items.push(new GridItem(x, y));
			}
		}
		
		this.n = this.items.length;
	};
	
	this.draw = function(ct) {
		ct.fillStyle = HEX_BG;
		ct.beginPath();
		
		for(var i = 0; i < this.n; i++) {
			this.items[i].draw(ct);
		}
		
		ct.closePath();
		ct.fill();
		
		ct.strokeStyle = HEX_HL;
		ct.beginPath();
		
		for(var i = 0; i < this.n; i++) {
			this.items[i].highlight(ct);
		}
		
		ct.closePath();
		ct.stroke();
	};
	
	this.init();
};

var init = function() {
	var s = getComputedStyle(c[0]), 
			rows, cols;
	
	w = ~~s.width.split('px')[0];
	h = ~~s.height.split('px')[0];
	_min = .75*min(w, h);
	
	rows = ~~(h/unit_y) + 2;
	cols = ~~(w/unit_x) + 2;
	
	for(var i = 0; i < n; i++) {
		c[i].width = w;
		c[i].height = h;
		ctx[i] = c[i].getContext('2d');
	}
	
	grid = new Grid(rows, cols);
	grid.draw(ctx[1]);
	
	if(!source) {
		source = { 'x': ~~(w/2), 'y': ~~(h/2) };
	}
	
	neon();
};

var neon = function() {
	var k = (t%T_SWITCH)*f, 
			rgb = {
				'r': ~~(wp[csi].r*(1 - k) + 
						 wp[(csi + 1)%nwp].r*k), 
				'g': ~~(wp[csi].g*(1 - k) + 
						 wp[(csi + 1)%nwp].g*k), 
				'b': ~~(wp[csi].b*(1 - k) + 
						 wp[(csi + 1)%nwp].b*k)
			}, 
			rgb_str = 'rgb(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ')', 
			light = ctx[0].createRadialGradient(
				source.x, source.y, 0, 
				source.x, source.y, .875*_min
			), stp;
	
	stp = .5 - .5*sin(7*t*f)*cos(5*t*f)*sin(3*t*f);
			
	light.addColorStop(0, rgb_str);
	light.addColorStop(stp, 'rgba(0,0,0,.03)');
	
	fillBackground('rgba(0,0,0,.02)');
	fillBackground(light);
	
	t++;
	
	if(t%T_SWITCH === 0) {
		csi++;
		
		if(csi === nwp) {
			csi = 0;
			t = 0;
		}
	}
	
	request_id = requestAnimationFrame(neon);
};

var fillBackground = function(bg_fill) {
	ctx[0].fillStyle = bg_fill;
	ctx[0].beginPath();
	ctx[0].rect(0, 0, w, h);
	ctx[0].closePath();
	ctx[0].fill();
};

init();

addEventListener('resize', init, false);

addEventListener('mousemove', function(e) {
	source = { 'x': e.clientX, 'y': e.clientY };
}, false);

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