"use strict"

class Background{
	
	constructor(world){
        this.yScale = height * 0.4;
		this.backScale = int(values.backgroundMoveScale);
	}
	
	update(){
		this.viewPort();
	}
	
	display(){
		this.show();
	}
	
	viewPort(){
		this.mountainPoints = [];
		this.groundPoints = [];
		this.yOff = height / 2 - (viewPort.y / game.world.dim.y - 0.5) * height / 2;
		for (let x = 0; x < width; x++){
			let y = noise(x / 100 + viewPort.x / this.backScale) - 0.5;
			this.mountainPoints.push({x: x, y: y * this.yScale + this.yOff});
			this.groundPoints.push({x: x, y: y * this.yScale * 0.1 + this.yOff + this.yScale / 2});
		}
	}
	
	show(){
		
		//Sky
		background(colors.background.sky);
        
        //Mountains
		strokeWeight(2);
		stroke(colors.background.mountains.stroke);
        fill(colors.background.mountains.fill)
        beginShape();
        for (let p of this.mountainPoints) vertex(p.x, p.y);
        vertex(width, height);
        vertex(0, height);
        vertex(0, this.mountainPoints[0].y);
        endShape();
        
        //Ground
        fill(colors.background.ground);
        beginShape();
        for (let p of this.groundPoints) vertex(p.x, p.y);
        vertex(width, height);
        vertex(0, height);
        vertex(0, this.groundPoints[0].y);
        endShape();
	}
}