how to move the enemy in microstudio

how to move the enemy in microstudio

HOW to move the enemy in microstudio

Hi and thank you very much for your prompt reply!

Now, where I must place these strings of code? In the main?

And, it's possible to create a sort of "attack" and "demage" for my hero and/or for enemies?

Thanks again!

Actor = class
  constructor = function(x, y, size, color, frameColor = "orange", liveCount = 100)
    this.x = x
    this.y = y
    this.size = size
    this.color = color
    this.frameColor = frameColor
    this.liveCount = liveCount
    this.drawLiveCount = true
  end
  
  draw = function()
    screen.fillRect(this.x, this.y, this.size, this.size, this.color)
    screen.drawRect(this.x, this.y, this.size, this.size, this.frameColor)
    if this.drawLiveCount then 
      screen.drawText(this.liveCount, this.x, this.y+this.size/2+this.size*0.2, 10, this.color)
    end
  end
end

Enemy = class extends Actor
  constructor = function(x, y)
    super(x, y, 20, "red")
    this.damage = 1  
  end
  
  hit = function(bullet)
    this.liveCount -= bullet.power
  end
  
  update = function(target)
    local direct_x = target.x - this.x
    local direct_y = target.y - this.y
    if direct_x < 0 then
      this.x -= 0.1
    else
      this.x += 0.1
    end
    if direct_y < 0 then
      this.y -= 0.1
    else
      this.y += 0.1
    end
  end
end

Player = class extends Actor
  constructor = function(x, y)
    super(x, y, 30, "green")
    this.bullets = []
    this.invincibilityFrames = 0
    this.shootCooldown = 0  
  end
  
  update = function()
    if keyboard.UP then
      this.y += 1
    elsif keyboard.DOWN then
      this.y -= 1
    elsif keyboard.LEFT then
      this.x -= 1
    elsif keyboard.RIGHT then
      this.x += 1
    end
    
    if this.invincibilityFrames > 0 then
      this.invincibilityFrames -= 1
    end

    if this.shootCooldown > 0 then
      this.shootCooldown -= 1
    end
    
    if keyboard.SPACE and this.bullets.length < 5 and this.shootCooldown == 0 then
      local direction = object x= 0 y= 0 end
      if keyboard.UP then direction.y = 1
      elsif keyboard.DOWN then direction.y = -1
      elsif keyboard.LEFT then direction.x = -1
      elsif keyboard.RIGHT then direction.x = 1
      end
      if direction.x != 0 or direction.y != 0 then
        this.bullets.push(new Bullet(this.x, this.y, direction))
        this.shootCooldown = 6  
      end
    end    
    
    for bullet in this.bullets
      bullet.update()
    end
    
    this.bullets = this.bullets.filter(function(bullet)
      return bullet.x > -screen.width/2 and bullet.x < screen.width/2 and
             bullet.y > -screen.height/2 and bullet.y < screen.height/2
    end)

  end
  
  draw = function()
    super()
    for bullet in this.bullets
      bullet.draw()
    end
  end

  takeDamage = function(damage)
    if this.invincibilityFrames == 0 then
      this.liveCount -= damage
      this.invincibilityFrames = 60  
    end
  end
end

Bullet = class extends Actor
  constructor = function(x, y, direction)
    super(x, y, 5, "yellow")
    this.direction = direction
    this.speed = 5
    this.drawLiveCount = false
    this.power = 5
  end
  
  update = function()
    this.x += this.direction.x * this.speed
    this.y += this.direction.y * this.speed
  end
end

init = function()
  player = new Player(0, 0)
  enemies = []
  for index = 1 to 20 by 1
    enemies.push(new Enemy(random.nextInt(screen.width) - screen.width / 2,
                           random.nextInt(screen.height) - screen.height / 2))
  end
end

update = function()
  player.update()
  enemies.forEach(function(enemy) 
    enemy.update(player)
    if checkCollision(enemy, player) then
      player.takeDamage(enemy.damage)
    end
  end)
  
  for bullet in player.bullets
    for enemy in enemies
      if checkCollision(bullet, enemy) then
        enemy.hit(bullet)
        if enemy.liveCount < 1 then
          enemies = enemies.filter(function(e) return e != enemy end)
        end
        player.bullets = player.bullets.filter(function(b) return b != bullet end)
      end
    end
  end
end

draw = function()
  screen.clear()
  screen.drawText("WASD or Arrow to Move, SPACE to Shoot", 0, 90, 20, "orange")
  player.draw()
  enemies.forEach(function(enemy) enemy.draw() end)
end

checkCollision = function(obj1, obj2)
  return abs(obj1.x - obj2.x) < (obj1.size + obj2.size) / 2 and
         abs(obj1.y - obj2.y) < (obj1.size + obj2.size) / 2
end

edit 2024.07.20

Thanks again for your reply :)

Sorry for bother you again, but since I'm starting from some days ago with the creation of my first game, how could I bring this function into my game? I mean that I want to use the function that you have suggested me, so add some enemies (with my sprites) in my levels that run to the hero for example and he must to jump or combat them.

Thanks in advance Tom

You can make your project public. You check the option in the project and enter the address here.

It is easier to suggest a solution when we see the source code of the program.

You can also look at the libraries and how problems were solved in the Explore section, e.g. at: https://microstudio.dev/i/gilles/quickengine/

Thanks for the reply

this is the link to my ongoing beta game: https://microstudio.io/i/TOMdesignorg/meowys_adventure/

You add new functionality to the existing code. To do this correctly, you need to understand how the creator of this code thought. You need to analyze all the code.

It will be easier for you if you start by understanding how to detect collisions with another object (enemy) or with the environment (map). Here are some examples.

https://microstudio.io/i/Loginus/collisiondemoquick/

https://microstudio.io/i/Loginus/mapcollision/

Start by trying QuickEngine. It has everything you need, collision detection and drawing. Moreover, it is very easy - perfect for small projects.