fin-hypergrid/src/lib/InclusiveRectangle.js

Canvas-based high-performance grid

'use strict';

var Rectangle = require('rectangular').Rectangle;

/*
 * The Hypergrid selection model defines a rectangle's bottom and right as inclusive rather than exclusive.
 * This definition works fine so long as it is used consistently. It does however throw off `Rectangle`'s
 * `width`, `height`, and `area` properties, all of which are getters which assume an exclusive model.
 * The following `SelectionModel` object extends (subclasses) `Rectangle` to correct this problem so that
 * those properties return accurate results.
 */
function InclusiveRectangle(x, y, width, height) {
    Rectangle.call(this, x, y, width - 1, height - 1);
}
InclusiveRectangle.prototype = Object.create(Rectangle.prototype, {
    width: {
        get: function() {
            return this.extent.x + 1;
        }
    },
    height: {
        get: function() {
            return this.extent.y + 1;
        }
    }
});

module.exports = InclusiveRectangle;