the shark should be looking directly at the turtle at all times; to accomplish this, first create a vector pointing from the shark to the turtle, by calculating the turtles position coordinates minus the sharks position coordinates. Then set the angle of the shark to the angle of this vector. Finally, you will need to set the shark to be flipped (not mirrored) when the turtle is to its left. code: https://github.com/stemkoski/B.A.G.E.L.-Java/tree/main/Part%2031

java code:

public class StarfishCollector extends Game
		{
		Sprite water;
		Group starfishGroup;
		Sprite turtle;
		Sprite winMessage;
		Group rockGroup;
		Sprite shark;
		public void initialize()
		{
		setTitle("Starfish Collector");
		setWindowSize(800, 600);
		water = new Sprite();
		water.setTexture( new Texture("images/water.png") );
		water.setPosition(400,300);
		group.add( water );
		rockGroup = new Group();
		Texture rockTexture = new Texture("images/rock.png");
		int rockCount = 3;
		for (int i = 0; i < rockCount; i++)
		{
		Sprite rock = new Sprite();
		double x = Math.random() * 600 + 100;
		double y = Math.random() * 400 + 100;
		rock.setPosition(x, y);
		rock.setTexture(rockTexture);
		rockGroup.add( rock );
		}
		group.add( rockGroup );
		shark = new Sprite();
		shark.setPosition(400,300);
		shark.setTexture( new Texture("images/shark.png") );
		group.add( shark );
		starfishGroup = new Group();
		Texture starfishTexture = new Texture("images/starfish.png");
		int starfishCount = 20;
		for (int i = 0; i < starfishCount; i++)
		{
		Sprite starfish = new Sprite();
		double x = Math.random() * 600 + 100;
		double y = Math.random() * 400 + 100;
		starfish.setPosition(x, y);
		starfish.setTexture(starfishTexture);
		boolean rockOverlap;
		do
		{
		rockOverlap = false;
		x = Math.random() * 600 + 100;
		y = Math.random() * 400 + 100;
		starfish.setPosition(x, y);
		for (Entity entity : rockGroup.getList())
		{
		Sprite rock = (Sprite)entity;
		if (rock.overlaps(starfish))
		rockOverlap = true;
		}
		} while( rockOverlap );
		starfishGroup.add( starfish );
		}
		group.add(starfishGroup);
		turtle = new Sprite();
		turtle.setPosition(90, 90);
		turtle.setTexture( new Texture("images/turtle.png") );
		group.add(turtle);
		// optional: add a transparent water layer on top
		// to create an "underwater" effect
		Sprite water2 = new Sprite();
		water2.setTexture( new Texture("images/water.png") );
		water2.setPosition(400,300);
		water2.opacity = 0.30;
		group.add( water2 );
		winMessage = new Sprite();
		winMessage.setPosition(400, 300);
		winMessage.setTexture( new Texture("images/youWin.png") );
		winMessage.visible = false;
		group.add(winMessage);
		}
		public void update()
		{
		if (winMessage.visible)
		return;
		if (input.isKeyPressed("RIGHT"))
		{
		turtle.moveBy(2, 0);
		turtle.setAngle(0);
		}
		if (input.isKeyPressed("LEFT"))
		{
		turtle.moveBy(-2, 0);
		turtle.setAngle(180);
		}
		if (input.isKeyPressed("UP"))
		{
		turtle.moveBy(0, -2);
		turtle.setAngle(270);
		}
		if (input.isKeyPressed("DOWN"))
		{
		turtle.moveBy(0, 2);
		turtle.setAngle(90);
		}
		if ( turtle.position.x < shark.position.x )
		shark.mirrored = true;
		if ( turtle.position.x > shark.position.x )
		shark.mirrored = false;
		for ( Entity entity : starfishGroup.getList() )
		{
		Sprite starfish = (Sprite)entity;
		if ( turtle.overlaps(starfish) )
		starfishGroup.remove(starfish);
		}
		for ( Entity entity : rockGroup.getList() )
		{
		Sprite rock = (Sprite)entity;
		turtle.preventOverlap(rock);
		}
		if (starfishGroup.size() == 0)
		winMessage.visible = true;
		turtle.boundToScreen(800, 600);
		}
		}