Source: draw/polygon.mjs

  1. import { Primitive } from "./primitive.mjs";
  3. /**
  4.  * Primitive to draw a polygon shape.
  5.  */
  6. export class PolygonPrimitive extends Primitive {
  7.     vertices;
  8.     constructor() {
  9.         super();
  11.         this.vertices = [];
  12.     }
  14.     /**
  15.      * Push a vertex into the vertices list.
  16.      * @param {number} x - the x coordinate of the vertex
  17.      * @param {number} y - the y coordiante of the vertex
  18.      * @returns {PolygonPrimitive}
  19.      */
  20.     vertex(x, y) {
  21.         this.vertices.push({ x, y });
  22.         return this;
  23.     }
  25.     /**
  26.      * Push a list of vertices into the verticles list.
  27.      * @param {Array} list - the list of vertices
  28.      * @returns {PolygonPrimitive}
  29.      */
  30.     vertexList(list) {
  31.         this.vertices.push(...list);
  32.         return this;
  33.     }
  35.     vertexIndex(index, x, y) {
  36.         this.vertices[index].x = { x, y };
  37.     }
  39.     /**
  40.      * Create a quad polygon.
  41.      * @param {number} ax a point x coord
  42.      * @param {number} ay a point y coord
  43.      * @param {number} bx b point x coord
  44.      * @param {number} by b point y coord
  45.      * @param {number} cx c point x coord
  46.      * @param {number} cy c point y coord
  47.      * @param {number} dx d point x coord
  48.      * @param {number} dy d point y coord
  49.      * @returns {PolygonPrimitive}
  50.      */
  51.     quad(ax, ay, bx, by, cx, cy, dx, dy) {
  52.         this.vertex(ax, ay);
  53.         this.vertex(bx, by);
  54.         this.vertex(cx, cy);
  55.         this.vertex(dx, dy);
  56.         return this;
  57.     }
  59.     /**
  60.      * Create a triangle polygon.
  61.      * @param {number} ax a point x coord
  62.      * @param {number} ay a point y coord
  63.      * @param {number} bx b point x coord
  64.      * @param {number} dy b point y coord
  65.      * @param {number} cx c point x coord
  66.      * @param {number} cy c point y coord
  67.      * @returns {PolygonPrimitive}
  68.      */
  69.     tri(ax, ay, bx, dy, cx, cy) {
  70.         this.vertex(ax, ay);
  71.         this.vertex(bx, by);
  72.         this.vertex(cx, cy);
  73.         return this;
  74.     }
  76.     genCmdList() {
  77.         let list = super.genCmdList();
  78.         list.push(this);
  79.         return list;
  80.     }
  81. }