C#•3y ago

How to make a function stays

I want to make like building mechanic to my game, but if I just "if(buttonclick){drawBlock}", the block just stays when the button is being clicked, and disappear when the button released

22 Replies

qqdev•3y ago

Can you show some code?

daveeskaOP•3y ago

which part?

cap5lut•3y ago

u could use a simple boolean variable, which is set to true on button click. during rendering u would check the variable to determine if u want draw the block or not

bool shouldDrawBlock = false;

void OnMouseButtonDown() // ur button click handler
{
  shouldDrawBlock = true;
}

void Render() // ur render method
{
  if (shouldDrawBlock)
  {
    drawBlock();
  }
}

bool shouldDrawBlock = false;

void OnMouseButtonDown() // ur button click handler
{
  shouldDrawBlock = true;
}

void Render() // ur render method
{
  if (shouldDrawBlock)
  {
    drawBlock();
  }
}

daveeskaOP•3y ago

but that only works once and the block that drawn are the same I want it to draw difference entity everytime it getclick

cap5lut•3y ago

hmm, ur description is a bit too vague for me to really help ya, can ya give more details?

daveeskaOP•3y ago

if I do your way,the block that drawn is the same if I click it again, the nothing will happen (i belive)

cap5lut•3y ago

well, if ya want it to toggle, then just use shouldDrawBlock = !shouldDrawBlock; in the button click handler

daveeskaOP•3y ago

but it still only work once right? cuz after it true for once, its going to be flse again which make the block dissappear

cap5lut•3y ago

that should persist the state unless ur shouldDrawBlock is a local variable instead of a member of ur class

daveeskaOP•3y ago

wdym? any example code?

cap5lut•3y ago

something like

public abstract class GameObject
{
    public bool IsVisible { get; set; } = true;

    public abstract void Draw();
}

public class Game
{
    private readonly List<GameObject> _objects = new(); // fill with some actual objects

    public void OnMouseClick()
    {
        GameObject gameObject = GetGameObjectFromMouseCoordsOrSomething();
        gameObject.IsVisible = !gameObject.IsVisible;
    }

    public void Draw()
    {
        foreach (var gameObject in _objects)
        {
            if (gameObject.IsVisible)
            {
                gameObject.Draw();
            }
        }
    }
}

public abstract class GameObject
{
    public bool IsVisible { get; set; } = true;

    public abstract void Draw();
}

public class Game
{
    private readonly List<GameObject> _objects = new(); // fill with some actual objects

    public void OnMouseClick()
    {
        GameObject gameObject = GetGameObjectFromMouseCoordsOrSomething();
        gameObject.IsVisible = !gameObject.IsVisible;
    }

    public void Draw()
    {
        foreach (var gameObject in _objects)
        {
            if (gameObject.IsVisible)
            {
                gameObject.Draw();
            }
        }
    }
}

ur block would be an instance of a type that inherits from GameObject and be stored in Game._objects now each block (and other game objects) have their own visibility state and they will be only rendered if its true.

daveeskaOP•3y ago

why does it need to an abstract class?

cap5lut•3y ago

because its a base type that doesnt know how to draw itself, that would be defined by subclasses and ofc its just a rough example

daveeskaOP•3y ago

GetGameObjectFromMouseCoordsOrSomething(); part is for the obj pos right?

daveeskaOP•3y ago

like that?

daveeskaOP•3y ago

daveeskaOP•3y ago

now it's doing this

cap5lut•3y ago

so when u click on the block u actually want to hide it, and when u click on it again u want to show it, right? if yes, that would mean, that u would first want to find the correct Ground tile u clicked on

// update state
if (Raylib.IsMouseButtonPressed(MouseButton.MOUSE_BUTTON_LEFT))
{
  var pos = Raylib.GetMousePosition();
  foreach (var obj in _objects)
  {
    if (/*check if pos is inside of the tile boundaries*/)
    {
      obj.IsVisible = !tile.IsVisible;
      break;
    }
  }
}

// render scene
foreach (var obj in _objects)
{
  if (obj.IsVisible)
  {
    obj.Draw();
  }
}

// update state
if (Raylib.IsMouseButtonPressed(MouseButton.MOUSE_BUTTON_LEFT))
{
  var pos = Raylib.GetMousePosition();
  foreach (var obj in _objects)
  {
    if (/*check if pos is inside of the tile boundaries*/)
    {
      obj.IsVisible = !tile.IsVisible;
      break;
    }
  }
}

// render scene
foreach (var obj in _objects)
{
  if (obj.IsVisible)
  {
    obj.Draw();
  }
}

i dunno anything about Raylib, so if (Raylib.IsMouseButtonPressed(MouseButton.MOUSE_BUTTON_LEFT)) could cause some flickering, then u would have to write some mechanic to only trigger it on actual changes for the latter something like:

public class ObservableValue<T>
{
    private T _value;

    public ObservableValue(T initialValue)
    {
        _value = initialValue;
    }
    
    public T Value
    {
        get => _value;
        set
        {
            if (value is null)
            {
                if (_value is null) return;
            }
            else if (value.Equals(_value))
            {
                return;
            }
                
            var oldValue = _value;
            _value = value;
            OnChange?.Invoke(oldValue, value);
        }
    }
    
    public event Action<T, T>? OnChange;
}

public class ObservableValue<T>
{
    private T _value;

    public ObservableValue(T initialValue)
    {
        _value = initialValue;
    }
    
    public T Value
    {
        get => _value;
        set
        {
            if (value is null)
            {
                if (_value is null) return;
            }
            else if (value.Equals(_value))
            {
                return;
            }
                
            var oldValue = _value;
            _value = value;
            OnChange?.Invoke(oldValue, value);
        }
    }
    
    public event Action<T, T>? OnChange;
}

Unknown User•3y ago

Message Not Public

cap5lut•3y ago

oh, then forget all about the IsVisble, then ya can simple add the new block to object list before rendering

if (Raylib.IsMouseButtonPressed(MouseButton.MOUSE_BUTTON_LEFT))
{
  _objects.Add(new Block {
    Position = Raylib.GetMousePosition()
  });
}

if (Raylib.IsMouseButtonPressed(MouseButton.MOUSE_BUTTON_LEFT))
{
  _objects.Add(new Block {
    Position = Raylib.GetMousePosition()
  });
}

Unknown User•3y ago

Message Not Public

cap5lut•3y ago

well i guess u have a drawing method like

    public void Draw()
    {
        foreach (var gameObject in _objects)
        {
            gameObject.Draw();
        }
    }

    public void Draw()
    {
        foreach (var gameObject in _objects)
        {
            gameObject.Draw();
        }
    }

to draw all ur entities. by adding the block to the _objects list, it will be rendered on the next frame

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