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evaluator.ts
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evaluator.ts
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/**
* create builder
*
* input to compiler is json
*
* program
* backgroung
* size
* startshape
* rule
* no need for path? user could just specify its drawing function assuming canvas is used
*
* compile each rule
* color adjust
* transform adjust
*
* runner
* use canvas
* first pass: eval all rules until no timeslice (no animation)
* need to have a
* run for how much time? how to animate
*
*
*/
import './config';
import * as _ from 'lodash';
import {utils, Shape} from './utils';
export class ShapeDesc {
shape: string;
data: JsonData;
transform: Transform;
hsv: Hsv;
alpha: number = 1;
color: Color;
isTerminal: boolean
constructor(data: JsonData) {
this.data = data;
this.shape = data.shape;
if (!this.shape) {
throw new Error('Shape with no name');
}
this.transform = utils.identity();
this.hsv = [0, 0, 0];
let adjustments = data.adjustments || {};
this.compileAdjustments(adjustments);
this.isTerminal = this.shape === 'SQUARE' || this.shape === 'CIRCLE' || this.shape === 'TRIANGLE';
}
compileAdjustments(adjustments: JsonData) {
_.each(adjustments, (paramValue, paramName) => {
switch(paramName) {
case 'x':
this.transform = utils.adjustTransform(this.transform, [1, 0, 0, 1, paramValue, 0]);
break;
case 'y':
this.transform = utils.adjustTransform(this.transform, [1, 0, 0, 1, 0, paramValue]);
break;
case 'rotate':
case 'r':
let rotate = paramValue
let cosTheta = Math.cos(-2 * Math.PI * rotate / 360);
let sinTheta = Math.sin(-2 * Math.PI * rotate / 360);
this.transform = utils.adjustTransform(
this.transform,
[cosTheta, -sinTheta, sinTheta, cosTheta, 0, 0]);
break;
case 's':
case 'size':
let s = paramValue;
if (typeof s === 'number') {
s = [s, s];
} else if (s.length == 1) {
s = [s[0], s[0]];
}
this.transform = utils.adjustTransform(
this.transform,
[s[0], 0, 0, s[1], 0, 0]);
break;
case 'h':
case 'hue':
let h = paramValue;
if (typeof h === 'number') {
// modulo 360
this.hsv[0] = h;
} else if (h.length === 1) {
this.hsv[0] = h[0];
} else if (h.length === 3) {
this.hsv = h.slice(0, 3);
} else if (h.length === 4) {
this.hsv = h.slice(0, 3);
this.alpha = h[3];
}
break;
case 'sat':
case 'saturation':
// [-1, 1]
this.hsv[1] = paramValue;
break;
case 'b':
case 'brightness':
// [-1, 1]
this.hsv[2] = paramValue
break;
case 'a':
case 'alpha':
// [-1, 1]
this.alpha = paramValue;
break;
case 'f':
case 'flip':
let c = Math.cos(Math.PI * paramValue / 90);
let scale = Math.sin(Math.PI * paramValue / 90);
this.transform = utils.adjustTransform(this.transform, [c, scale, scale, -c, 0, 0]);
break;
case 'skew':
let sx = Math.tan(Math.PI * paramValue[0] / 180);
let sy = Math.tan(Math.PI * paramValue[1] / 180);
this.transform = utils.adjustTransform(this.transform, [1, sy, sx, 1, 0, 0]);
break;
}
});
// s-v and alpha => [-1, 1]
for (let i = 1; i < 3; ++i) {
this.hsv[i] = Math.min(Math.max(this.hsv[i], -1), 1);
}
this.alpha = Math.min(Math.max(this.alpha, -1), 1);
this.color = [this.hsv[0], this.hsv[1], this.hsv[2], this.alpha];
}
}
export class Rule {
name: string;
weight: number;
shapes: Array<ShapeDesc> = [];
probability: number = 0;
constructor(data: JsonData) {
this.name = data.name;
if (!this.name) {
throw new Error('Rule with no name');
}
this.weight = data.weight || 1;
if (data.shapes) {
this.shapes = data.shapes.map(s => new ShapeDesc(s));
}
}
}
export class Grammar {
startshape: ShapeDesc;
// TODO background
ruleGroups: Map<string, Array<Rule>> = new Map<string, Array<Rule>>()
constructor (data: JsonData) {
if (!data.startshape) {
throw new Error('startshape is needed');
}
if (!data.rules) {
throw new Error('no rules');
}
let rules = data.rules.map(r => new Rule(r));
for (let r of rules) {
if (!this.ruleGroups.has(r.name)) {
this.ruleGroups.set(r.name, new Array<Rule>());
}
this.ruleGroups.get(r.name).push(r);
}
this.startshape = _.isString(data.startshape) ? new ShapeDesc({shape: data.startshape}) : new ShapeDesc(data.startshape);
let startShapeRule = this.ruleGroups.get(this.startshape.shape);
if (!startShapeRule || startShapeRule.length === 0) {
throw new Error('startshape: ' + this.startshape.shape + ' is not specified in rules');
}
for (let rules of this.ruleGroups.values()) {
let totalWeight = rules.reduce((t, r) => r.weight + t, 0);
for (let r of rules) {
r.probability = r.weight / totalWeight;
}
}
}
getRule (ruleName: string, probability?: number) : Rule {
let rg = this.ruleGroups.get(ruleName);
if (rg.length === 1) {
return rg[0];
}
let probabilityTotal = 0;
probability = probability === undefined ? Math.random() : probability;
for (let r of rg) {
probabilityTotal += r.probability;
if (probability < probabilityTotal) {
return r;
}
}
// Should not be here...
return rg[rg.length - 1];
}
}
export class EvalDesc {
transform: Transform;
color: Color;
shapeDesc: ShapeDesc;
constructor(transform: Transform, color: Color, shapeDesc: ShapeDesc) {
this.transform = transform;
this.color = color;
this.shapeDesc = shapeDesc;
}
}
export enum EvaluationType {
RulesSync,
RulesASync,
RuleAndShapeSync,
RuleAndShapeASync
}
export class RuleStat {
count: number = 0;
}
export class EvaluationStats {
rules: Map<string, RuleStat> = new Map<string, RuleStat>()
shapes: Shape[] = [];
evaluationTime: number;
_startEvaluation: number;
renderTime: number;
culledShapeCount: number = 0;
startEvaluation () {
this._startEvaluation = Date.now();
}
endEvaluation(shapes: Shape[]) {
this.evaluationTime = Date.now() - this._startEvaluation;
this.shapes = shapes;
}
evalRule (rule: Rule) {
let ruleName = rule.name + '_' + rule.probability;
if (!this.rules.has(ruleName)) {
this.rules.set(ruleName, new RuleStat());
}
let ruleStat = this.rules.get(ruleName);
ruleStat.count++;
}
totalRules () {
let nbRules = 0;
this.rules.forEach(r => nbRules = nbRules + r.count);
return nbRules;
}
shapeStats () {
let shapes = {
SQUARE: 0,
CIRCLE: 0,
TRIANGLE: 0,
};
for (let s of this.shapes) {
if (shapes[s.shape] !== undefined) {
shapes[s.shape]++;
}
}
return shapes;
}
}
export class Evaluator {
grammar: Grammar;
evaluationStack: EvalDesc[] = [];
shapes: Shape[] = [];
stats: EvaluationStats;
constructor (grammar: Grammar) {
this.grammar = grammar;
this.stats = new EvaluationStats();
// TODO: For split evaluation:
// loop over the rule until not able to create new shape
// draw each found shapes
}
evaluate(evalType: EvaluationType) : void {
let initialTransform = utils.identity();
let initialColor = utils.defaultColor();
this.evaluationStack.push(new EvalDesc(initialTransform, initialColor, this.grammar.startshape));
this._evalRulesSync();
}
_evalRulesSync () : Shape[] {
this.stats.startEvaluation();
while (this.evaluationStack.length) {
this._evaluateTick();
}
this.stats.endEvaluation(this.shapes);
return this.shapes;
}
_evaluateTick(): Shape {
if (this.evaluationStack.length === 0) {
throw new Error('Evaluation is empty');
}
let desc = this.evaluationStack.shift();
let transform = utils.adjustTransform(desc.transform, desc.shapeDesc.transform);
let color = utils.adjustColor(desc.color, desc.shapeDesc.color);
// TODO check shape transform size to see if we stop recursion.
let shape;
if (desc.shapeDesc.isTerminal) {
let shape = new Shape(desc.shapeDesc.shape, transform, color);
this.shapes.push(shape);
return shape;
}
let rule = this.grammar.getRule(desc.shapeDesc.shape);
this.stats.evalRule(rule);
for (let sd of rule.shapes) {
this.evaluationStack.push(new EvalDesc(transform, color, sd));
}
}
}