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Move area method to Geometry (#1) #4

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Move area method to Geometry (#1) #4

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27 changes: 14 additions & 13 deletions JavaScript/8-geometry.js
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Original file line number Diff line number Diff line change
Expand Up @@ -16,16 +16,6 @@ class Polygon {
this.points = points;
}

get area() {
let value = 0;
let d = this.points[this.points.length - 1];
for (const p of this.points) {
value += p.x * d.y - d.x * p.y;
d = p;
}
return Math.abs(value) / 2;
}

toString() {
return this.points.map((p) => p.toString()).join('; ');
}
Expand Down Expand Up @@ -62,23 +52,34 @@ class Geometry {
point.y = x * sin + y * cos;
}
}

static area(polygon) {
const { points } = polygon
let value = 0;
let d = points[points.length - 1];
for (const p of points) {
value += p.x * d.y - d.x * p.y;
d = p;
}
return Math.abs(value) / 2;
}
}

// Usage

const rect = new Rect(10, 10, 30, -10);
console.log(rect);
console.log(rect.area);
console.log(Geometry.area(rect));

console.log('Rotate 45');
Geometry.rotate(rect, 45);
console.log(rect);
console.log(rect.area);
console.log(Geometry.area(rect));

const triangle = new Triangle(0, 0, 15, 0, 0, 15);
console.log(triangle);
console.log('Rotate 90');
Geometry.rotate(triangle, 90);
console.log(triangle);
console.log(triangle.area);
console.log(Geometry.area(triangle));
console.log(`${triangle}`);