Icicles.java

package com.mygdx.game.icicles;

import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.utils.Array;
import com.badlogic.gdx.utils.DelayedRemovalArray;
import com.badlogic.gdx.utils.viewport.Viewport;
import com.mygdx.game.icicles.Constants.Difficulty;

/**
 * Created by linzhang on 9/11/2017.
 */

public class Icicles {
    public static final String TAG = Icicles.class.getName();

    // TODO: Add an array of icicles and a viewport
    DelayedRemovalArray<Icicle> icicleList;
    Viewport viewport;

    Difficulty difficulty;

    int iciclesDodged;

    public Icicles(Viewport viewport, Difficulty difficulty) {
        this.viewport = viewport;
        this.difficulty = difficulty;
        init();
    }
    public void init() {
        icicleList = new DelayedRemovalArray<Icicle>(false, 100);
        iciclesDodged = 0;
    }

    public void update(float delta) {
        // TODO: Replace hard-coded spawn rate with a constant
        if(MathUtils.random() < delta * difficulty.spawnRate) {
            // TODO: Add a new icicle at the top of the viewport at a random x position
            Vector2 newIciclePosition = new Vector2(
                    MathUtils.random() * viewport.getWorldWidth(),
                    viewport.getWorldHeight()
            );
            Icicle newIcicle = new Icicle(newIciclePosition);
            icicleList.add(newIcicle);
        }

        // TODO: Update each icicle
        for (Icicle icicle : icicleList) {
            icicle.update(delta);
        }

        // TODO: begin a removal session
        icicleList.begin();

        // TODO: Remove any icicle completely off the bottom of the screen
        for(int i = 0; i < icicleList.size; i++) {
            if(icicleList.get(i).position.y < -Constants.ICICLES_HEIGHT) {
                icicleList.removeIndex(i);
                iciclesDodged++;
            }
        }

        // TODO: End removal session
        icicleList.end();
    }

    public void render(ShapeRenderer render) {
        // TODO: Set ShapeRenderer Color
        render.setColor(Constants.ICICLE_COLOR);

        // TODO: Render each icicle
        for(Icicle icicle : icicleList) {
            icicle.render(render);
        }
    }
}