71 lines
2.2 KiB
JavaScript
71 lines
2.2 KiB
JavaScript
export default class CoordinatesConverter {
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constructor(p1, p2, p3) {
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this.ABMatrix = this.conversionMatrixAB(p1, p2, p3);
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this.BAMatrix = this.conversionMatrixBA(p1, p2, p3);
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}
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conversionMatrixAB(p1, p2, p3) {
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const p1p2ax = p1.a.x - p2.a.x;
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const p1p3ax = p1.a.x - p3.a.x;
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const p1p2ay = p1.a.y - p2.a.y;
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const p1p3ay = p1.a.y - p3.a.y;
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const p1p2bx = p1.b.x - p2.b.x;
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const p1p3by = p1.b.y - p3.b.y;
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const p1p3bx = p1.b.x - p3.b.x;
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const p1p2by = p1.b.y - p2.b.y;
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const divAD = p1p2ax * p1p3ay - p1p3ax * p1p2ay;
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const dibBE = p1p2ay * p1p3ax - p1p3ay * p1p2ax;
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const A = (p1p2bx * p1p3ay - p1p3bx * p1p2ay) / divAD;
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const B = (p1p2bx * p1p3ax - p1p3bx * p1p2ax) / dibBE;
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const C = p1.b.x - A * p1.a.x - B * p1.a.y;
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const D = (p1p2by * p1p3ay - p1p3by * p1p2ay) / divAD;
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const E = (p1p2by * p1p3ax - p1p3by * p1p2ax) / dibBE;
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const F = p1.b.y - D * p1.a.x - E * p1.a.y;
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return {A, B, C, D, E, F};
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}
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conversionMatrixBA(p1, p2, p3) {
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const p1p2ax = p1.a.x - p2.a.x;
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const p1p3ax = p1.a.x - p3.a.x;
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const p1p2ay = p1.a.y - p2.a.y;
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const p1p3ay = p1.a.y - p3.a.y;
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const p1p2bx = p1.b.x - p2.b.x;
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const p1p3by = p1.b.y - p3.b.y;
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const p1p3bx = p1.b.x - p3.b.x;
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const p1p2by = p1.b.y - p2.b.y;
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const divAD = p1p2bx * p1p3by - p1p3bx * p1p2by;
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const dibBE = p1p2by * p1p3bx - p1p3by * p1p2bx;
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const A = (p1p2ax * p1p3by - p1p3ax * p1p2by) / divAD;
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const B = (p1p2ax * p1p3bx - p1p3ax * p1p2bx) / dibBE;
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const C = p1.a.x - A * p1.b.x - B * p1.b.y;
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const D = (p1p2ay * p1p3by - p1p3ay * p1p2by) / divAD;
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const E = (p1p2ay * p1p3bx - p1p3ay * p1p2bx) / dibBE;
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const F = p1.a.y - D * p1.b.x - E * p1.b.y;
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return {A, B, C, D, E, F};
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}
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convertAB(x, y) {
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return this.convert(x, y, this.ABMatrix);
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}
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convertBA(x, y) {
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return this.convert(x, y, this.BAMatrix);
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}
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convert(oldX, oldY, matrix) {
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const {A, B, C, D, E, F} = matrix;
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const x = A * oldX + B * oldY + C;
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const y = D * oldX + E * oldY + F;
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return {x, y};
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}
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}
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