Commit f1047dda565a1838833a763a1758b2c3e42bb3a5 - Erratic-Turtle-Graphics

+5

-5

demo/erratic-turtle-graphics-launcher.js less more

9	9	config.container.appendChild(can);
10	10
11	11	var turtle = (new ErraticTurtle()).init({ canvas: can });
12		var program = "setxyp 0.125 0.5 lt 90 repeat 7 [ repeat 50 [ fd 150 lt 180 ] shiftxyp 0.125 0.0 ]";
	12	var program = "seterr 0 0 setxyp 0.125 0.5 lt 90 repeat 7 [ repeat 50 [ fd 150 lt 180 ] shiftxyp 0.125 0.0 shifterr 0.01 2.0 ]";
13	13
14	14	function run() {
15	15	turtle.reset();

28	28	options: [
29	29	{
30	30	text: 'Lines',
31		value: "setxyp 0.125 0.5 lt 90 repeat 7 [ repeat 50 [ fd 150 lt 180 ] shiftxyp 0.125 0.0 ]"
	31	value: "seterr 0 0 setxyp 0.125 0.5 lt 90 repeat 7 [ repeat 50 [ fd 150 lt 180 ] shiftxyp 0.125 0.0 shifterr 0.01 2.0 ]"
32	32	},
33	33	{
34	34	text: 'Boxes',
35		value: "setxyp 0.125 0.666 lt 90 repeat 7 [ repeat 400 [ fd 50 lt 90 ] shiftxyp 0.125 0.0 ]"
	35	value: "seterr 0 0 setxyp 0.125 0.666 lt 90 repeat 7 [ repeat 400 [ fd 50 lt 90 ] shiftxyp 0.125 0.0 shifterr 0.01 2.0 ]"
36	36	},
37	37	{
38	38	text: 'Circles',
39		value: "setxyp 0.125 0.666 lt 90 repeat 7 [ repeat 4500 [ fd 1.0 lt 4 ] shiftxyp 0.125 0.0 ]"
	39	value: "seterr 0 0 setxyp 0.125 0.666 lt 90 repeat 7 [ repeat 4500 [ fd 1.0 lt 4 ] shiftxyp 0.125 0.0 shifterr 0.025 0.333 ]"
40	40	},
41	41	{
42	42	text: 'Circle Chain',
43		value: "setxyp 1.0 0.5 lt 90 repeat 7 [ repeat 1845 [ fd 2.0 lt 4 ] lt 180 ] repeat 7 [ repeat 1845 [ fd 2.0 lt 4 ] lt 180 ]"
	43	value: "seterr 0 0 setxyp 1.0 0.5 lt 90 repeat 7 [ repeat 1845 [ fd 2.0 lt 4 ] lt 180 shifterr 0.025 1.5 ] repeat 7 [ repeat 1845 [ fd 2.0 lt 4 ] lt 180 shifterr -0.025 -1.5 ]"
44	44	}
45	45	],
46	46	onchange: function(option) {

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src/erratic-logo.js less more

114	114	/*
115	115	* Instr ::= "fd" Number \| "rt" Number \| "lt" Number
116	116	* \| "setxyp" Number Number \| "shiftxyp" Number Number
	117	* \| "seterr" Number Number \| "shifterr" Number Number
117	118	* \| "repeat" Number "[" Instrs "]".
118	119	*/
119	120	this.parseInstr = function() {

141	142	var yval = this.scanner.token;
142	143	this.scanner.expectType('number');
143	144	return ["shiftxyp", parseFloat(xval), parseFloat(yval)];
	145	} else if (this.scanner.consume('seterr')) {
	146	var rerrval = this.scanner.token;
	147	this.scanner.expectType('number');
	148	var merrval = this.scanner.token;
	149	this.scanner.expectType('number');
	150	return ["seterr", parseFloat(rerrval), parseFloat(merrval)];
	151	} else if (this.scanner.consume('shifterr')) {
	152	var rerrval = this.scanner.token;
	153	this.scanner.expectType('number');
	154	var merrval = this.scanner.token;
	155	this.scanner.expectType('number');
	156	return ["shifterr", parseFloat(rerrval), parseFloat(merrval)];
144	157	} else if (this.scanner.consume('repeat')) {
145	158	var val = this.scanner.token;
146	159	this.scanner.expectType('number');

184	197	case "shiftxyp":
185	198	turtle.shiftXYProportional(instr[1], instr[2]);
186	199	break;
	200	case "seterr":
	201	turtle.setErrorRates(instr[1], instr[2]);
	202	break;
	203	case "shifterr":
	204	turtle.shiftErrorRates(instr[1], instr[2]);
	205	break;
187	206	case "repeat":
188	207	for (var k = 0; k < instr[1]; k++) {
189	208	interpretInstrs(instr[2], turtle);

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src/erratic-turtle.js less more

40	40	this.shiftXYProportional = function(dxp, dyp) {
41	41	this.x += this.canvas.width * dxp;
42	42	this.y += this.canvas.height * dyp;
	43	};
	44
	45	this.setErrorRates = function(rerr, merr) {
	46	this.rotateError = rerr;
	47	this.moveError = merr;
	48	};
	49
	50	this.shiftErrorRates = function(drerr, dmerr) {
	51	this.rotateError += drerr;
	52	this.moveError += dmerr;
43	53	};
44	54
45	55	/* dtheta is in radians */