Got an error using IntersectsWith in C#.

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Can someone help me on how i can detect collision between two objects. At first i thought IntersectsWith would help but i get the error saying my solution doesnot contain the definition for IntersectsWith. Here is my code that gives me errors:

C#

class Car
    {
        private int _x,_y, _width, _height,_xvel;

     
        public Car(Random r, int y, int width, int height, int xvel)
        {
            this._x = r.Next(500)+20;
            //this._x = x;
            this._y = y;
            this._width = width;
            this._height = height;
            this._xvel = xvel;
        }

        public int X { get { return _x; } }
        public int Y { get { return _y; } }
        public int Width { get { return _width; } }
        public int Height{ get { return _height; } }
        public int Xvel { get { return _xvel; } }
    
        public void DrawCar(Graphics g)
        {
            g.DrawRectangle(Pens.Blue, new Rectangle(X, Y, Width, Height));            
        }
     
        public void MoveCar(int gamewidth)
        {
            if( _x + _width >= gamewidth)
            {              
                _x = 0;
            }
            _x = _x + _xvel;        
        }        
    }

    class Player
    {
         private int _x, _y, _width, _height, _xvel,_yvel;  

       
         public Player(int x, int y, int width,int height, int xvel, int yvel)
        {
            this._x = x;
            this._y = y;
            this._width = width;
            this._height = height;
            this._xvel = xvel;
            this._yvel = yvel;
        }

        public int X { get { return _x; } }
        public int Y { get { return _y; } }
        public int Width { get { return _width; } }
        public int Height{ get { return _height; } }
        public int Xvel { get { return _xvel; } }
        public int Yvel { get { return _yvel; } }
    
        public void DrawPlayer(Graphics g)
        {
            g.DrawRectangle(Pens.Red, new Rectangle(X, Y, Width, Height));            
        }

        public void CollisionDetection(Rectangle player, Rectangle car)
        {
            if (player.IntersectsWith(car))
            {
                MessageBox.Show("You Lose!");                
            }

        }      

        public void MovePlayerLeft(int gamewidth)
        {
            if (_x > 0)
            {
                _x -= _xvel;
            }
        }
    }

public partial class Form1 : Form
    {     
      
        Car cars;

       Player player;    

        public Form1()
        {
            InitializeComponent();
          
            player = new Player(((Width / 2) - 15), (Height - 75),30, 30, 10, 10);
            
            Random r = new Random();
            cars = new Car(r, 200, 30, 30, 10);         
            
        }
      
        private void Form1_Paint(object sender, PaintEventArgs e)
        {            
                Graphics g = e.Graphics;
                g.Clear(Color.White);
                cars.DrawCar(g);
                player.DrawPlayer(g);
                player.CollisionDetection(player, cars); //This is the part that implements collision detection
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            cars.MoveCar(this.Width);
            this.Invalidate();
        }
    }

Posted 28-Apr-13 1:47am

Qobacha

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Kenneth Haugland · Answer 1 · 2013-04-28T02:07:00

Solution 1

Looks pretty straight fporward, perhaps you ned to draw the graphics first?
http://msdn.microsoft.com/en-us/library/system.drawing.rectangle.intersectswith.aspx[^]

Posted 28-Apr-13 2:07am

Kenneth Haugland

Comments

Qobacha 28-Apr-13 8:27am

I've already drawn the graphics on cars.DrawCar(g) and player.DrawPlayer(g). But when calling player.CollisionDetection(player, cars); i got the error saying thesolution doesnot contain the definition for IntersectsWith. So its clear the player and car objects aren't recognized as Rectangle objects. Maybe the question can be better put as how can I return car and player from both classes as Rectangle objects?

OriginalGriff · Answer 2 · 2013-04-28T02:19:00

You seem a little confused here:

C#

player.CollisionDetection(player, cars);

C#

Car cars;
Player player;

C#

class Player
{
...
    public void CollisionDetection(Rectangle player, Rectangle car)
    {
        if (player.IntersectsWith(car))
...

So, since Player isn't related to Rectangle, you can't pass it to your collision detection method.
Which is probably something to do with the error message you get: your Player class does not implement IntersectsWith so you can't call it.

I think you need to take a step back, and look at deriving some of your classes from base classes, possibly rectangle (though I suspect that would be a poor move - I would have an abstract "Sprite" class or similar to derive both from, which might happen to contain a rectangle, or possibly a Region for later use, and which does the collision detection for derived classes)