rowboz/robots.go

package main

func (game *Game) initRobots() {
	var fabricate int = game.level * 16
	for i := 0; i < fabricate; i++ {
		var found bool
		var rndPos Position
		for !found {
			rndPos = game.randPos()
			if !game.onPlayer(rndPos) {
				found = true
			}
		}
		rndRobot := Robot{
			id:       i,
			position: rndPos,
		}
		game.robots = append(game.robots, rndRobot)
	}
}

func (game *Game) drawRobots() {
	for _, r := range game.robots {
		game.screen.SetContent(r.position.x, r.position.y, '+', nil, game.style)
	}
}

func (game *Game) moveRobots() {
	// Iterate through the robots
	for i, r := range game.robots {

		// Determine in which direction to go
		if game.player.position.x < r.position.x {
			game.robots[i].position.x--
		} else if game.player.position.x > r.position.x {
			game.robots[i].position.x++
		}

		if game.player.position.y < r.position.y {
			game.robots[i].position.y--
		} else if game.player.position.y > r.position.y {
			game.robots[i].position.y++
		}

	}

	// After all the moves, lets check if any of the rowboz collided with anything
	for _, r := range game.robots {

		// Hit a player? Game over!
		if game.onPlayer(r.position) {
			game.gameover = 1
			return
		}

		// Robots mingling? Trash!
		if game.onRobot(r) {

			// Delete robot
			game.deleteRobot(r)

			// Create trash
			game.addTrash(r)

		}

		// Hugging Trash? More trash!
		if game.onTrash(r.position) {

			// Delete robot
			game.deleteRobot(r)

		}

	}
}

func (game *Game) onRobot(robot Robot) bool {
	var found bool = false
	for _, r := range game.robots {
		if robot.id != r.id && robot.position == r.position {
			found = true
		}
	}
	return found
}

// TODO: improve this
func (game *Game) deleteRobot(robot Robot) {

	// The following would work, if it wasn't for the fact you are iterating through an array,
	// and deleting elements form that same array. So deleting item #15 isn't going to work
	// when the array has been reduced to 13 elements.
	// if robot < len(game.robots) {
	// 	game.robots = append(game.robots[:robot], game.robots[robot+1:]...)
	// }

	// This isn't going to work for the same reason,
	// and it adds the issue that random robots will get deleted.
	// var rowboz []Position

	// for i, r := range game.robots {
	// 	if robot != i {
	// 		rowboz = append(rowboz, r)
	// 	}
	// }

	// game.robots = nil
	// game.robots = rowboz

	// Conclusion: I need to find a different way to do this properly while iterating to that same array.

	var rowboz []Robot

	for _, r := range game.robots {
		if robot != r {
			rowboz = append(rowboz, r)
		}
	}
	game.robots = nil
	game.robots = rowboz

	game.player.score++

}