smartgame/js/Rect.js

import Vec2 from "./Vec2.js";

export default class Rect {
	constructor(pos = new Vec2(), size = new Vec2()) {
		this.pos = pos;
		this.size = size;
	}

	draw(ctx) {
		ctx.moveTo(this.pixelLeft, this.pixelTop);
		ctx.lineTo(this.pixelRight, this.pixelTop);
		ctx.lineTo(this.pixelRight, this.pixelBottom);
		ctx.lineTo(this.pixelLeft, this.pixelBottom);
		ctx.closePath();
		ctx.stroke();
	}

	intersects(other) {
		return (
			(this.left < other.right && this.right > other.left) &&
			(this.top < other.bottom && this.bottom > other.top));
	}

	intersectSide(other) {
		let mx = this.midX;
		let my = this.midY;

		let diffleft = mx - other.pos.x;
		let diffright = mx - (other.pos.x + other.size.x);
		let difftop = my - (other.pos.y + other.size.y);

		if (diffleft <= 0)
			return "left";
		else if (diffright >= 0)
			return "right";
		else if (difftop >= 0)
			return "bottom";
		else
			return "top";
	}

	contains(other) {
		return (
			(this.left <= other.left && this.right >= other.right) &&
			(this.top <= other.top && this.bottom >= other.bottom));
	}

	get midX() {
		return this.pos.x + (this.size.x / 2);
	}
	get midY() {
		return this.pos.y + (this.size.y / 2);
	}

	get top() {
		return this.pos.y;
	}
	set top(n) {
		this.pos.y = n;
	}
	get pixelTop() {
		return this.pos.pixelY;
	}
	set pixelTop(y) {
		this.pos.pixelY = y;
	}
	resizeTopTo(y) {
		let diff = y - this.top;
		this.top = y;
		this.size.y += diff;
	}
	pixelResizeTopTo(y) {
		let diff = y - this.pixelTop;
		this.pixelTop = y;
		this.size.pixelY += diff;
	}

	get bottom() {
		return this.pos.y + this.size.y;
	}
	set bottom(y) {
		this.pos.y = y - this.size.y;
	}
	get pixelBottom() {
		return this.pos.pixelY + this.size.pixelY;
	}
	set pixelBottom(y) {
		this.pos.pixelY = y + this.size.pixelY;
	}
	resizeBottomTo(y) {
		let diff = y - this.bottom;
		this.size.y += diff;
	}
	pixelResizeBottomTo(y) {
		let diff = y - this.pixelBottom;
		this.size.pixelY += diff;
	}

	get left() {
		return this.pos.x;
	}
	set left(x) {
		this.pos.x = x;
	}
	get pixelLeft() {
		return this.pos.pixelX;
	}
	set pixelLeft(x) {
		this.pos.pixelX = x;
	}
	resizeLeftTo(x) {
		let diff = x - this.left;
		this.left = x;
		this.size.x += diff;
	}
	pixelResizeLeftTo(x) {
		let diff = x - this.pixelLeft;
		this.pixelLeft = x;
		this.size.pixelX += diff;
	}

	get right() {
		return this.pos.x + this.size.x;
	}
	set right(n) {
		this.pos.x = n - this.size.x;
	}
	get pixelRight() {
		return this.pos.pixelX + this.size.pixelX;
	}
	set pixelRight(x) {
		this.pos.pixelX = x + this.size.pixelX;
	}
	resizeRightTo(x) {
		let diff = x - this.right;
		this.size.x += diff;
	}
	pixelResizeRightTo(x) {
		let diff = x - this.pixelRight;
		this.size.pixelX += diff;
	}
}