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import {Rat} from './Rat' |
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import Symbolizer from './Symbolizer' |
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interface Coefficents<Rat> { |
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[Key: string]: Rat; |
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} |
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/** |
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* @class Rational polynumber |
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* @name Polyrat |
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*/ |
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export class Polyrat { |
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// coefficent values are indexed with their the exponents in each dimension, comma-separated, as the key |
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coefficents: Coefficents<Rat> = {} |
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// the dimension is how many params there are, defined by the length of the exponent keys |
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dimension = 0 |
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// unique symbols for each dimension |
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symbols = '' |
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/** |
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* Initialize a rational polynumber. |
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*/ |
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constructor(coefficents?: Coefficents<Rat>) { |
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if (coefficents) this.coefficents = coefficents |
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if (Object.keys(this.coefficents).length) { |
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this.dimension = Object.keys(this.coefficents)[0].split(',').length |
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} |
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const sg = (new Symbolizer('xyzw')).generator() |
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for (let i=0; i<this.dimension; i++) { |
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this.symbols += sg.next().value |
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} |
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} |
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/** |
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* Evaluate the result given the parameters for each dimension. |
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*/ |
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evaluate(parameters: Rat[]): Rat { |
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let result: Rat = new Rat() |
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for (const [exponents, coefficent] of Object.entries(this.coefficents)) { |
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let value: Rat = coefficent |
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const dimensions = exponents.split(',') |
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for (let i=0; i<dimensions.length; i++) { |
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value = value.mul(parameters[i].pow(new Rat(parseInt(dimensions[i], 10)))) |
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} |
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result = result.add(value) |
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} |
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return result |
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} |
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/** |
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* The text representation. |
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*/ |
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toString(): string { |
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// return JSON.stringify(this.coefficents) |
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const r = [] |
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for (const [exponents, coefficent] of Object.entries(this.coefficents)) { |
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r.push(`'${exponents}': ${coefficent.toString()}'`) |
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} |
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return `[${r.join(',')}]` |
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} |
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/** |
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* The "calc" code for evaluating the value. |
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*/ |
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toCalcFormula(): string { |
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const r: string[] = [] |
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for (const [exponents, coefficent] of Object.entries(this.coefficents)) { |
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const t: string[] = [] |
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const f = coefficent.toString() |
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if (f !== '1') t.push(f) |
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const dimensions = exponents.split(',') |
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for (let i=0; i<dimensions.length; i++) { |
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if (dimensions[i] !== '0') { |
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t.push(`${this.symbols[i]}^${parseInt(dimensions[i], 10)}`) |
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} |
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} |
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if (t) r.push(t.join('*')) |
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} |
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return r.join(' + ') |
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} |
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/** |
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* The GLSL code for evaluating the value. |
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*/ |
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toGLSLFormula(): string { |
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const r: string[] = [] |
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for (const [exponents, coefficent] of Object.entries(this.coefficents)) { |
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const t: string[] = [] |
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const f = coefficent.toString() |
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if (f !== '1') t.push(f+'.0') |
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const dimensions = exponents.split(',') |
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for (let i=0; i<dimensions.length; i++) { |
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if (dimensions[i] !== '0') { |
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t.push(`pow(${this.symbols[i]},${parseInt(dimensions[i], 10)}.0)`) |
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} |
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} |
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if (t) r.push(t.join('*')) |
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} |
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return r.join('+') |
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} |
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/** |
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* Clone this. |
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*/ |
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clone(): Polyrat { |
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return new Polyrat(this.coefficents) |
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} |
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} |
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/** |
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* Parse the string and return it as a Polyrat. |
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*/ |
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export const stringToPolyrat = (s: string): Polyrat => { |
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return new Polyrat(JSON.parse(s) as Coefficents<Rat>) |
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} |
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export default Polyrat |
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acerix /
cnum
