General

Re: How do I get my enemy to go down screen

Nick Gravelyn — Fri, 18 Apr 2008 11:27:45 GMT

You might want to check out xnadevelopment.com. There are a lot of nice, basic tutorials covering moving sprites, making them jump, and other 2D things.

Re: How do I get my enemy to go down screen

Gamesmaster3 — Fri, 18 Apr 2008 09:20:38 GMT

Jim W:
Where's your draw code?

Whatever variable you use for the sprite's Position, just say this.Position = new Vector2(this.Position.X, this.Position.Y+1); where 1 is how far to move it down.

Thanks alot that worked perfectly! Thanks alot Jim.I have alot to learn.As you can tell I'm still having trouble sometimes understanding the code.But I am working on it.I figure if I keep working on different projects that sooner or later I will be able to understand everything enentually.

Anyway Thanks

Re: How do I get my enemy to go down screen

Matthew Knowles — Fri, 18 Apr 2008 09:18:38 GMT

Could you post the update and render functions for your Sprite class. It looks like the problem may lie in one of those.

Re: How do I get my enemy to go down screen

Jim Welch — Fri, 18 Apr 2008 02:33:00 GMT

Where's your draw code?

Whatever variable you use for the sprite's Position, just say this.Position = new Vector2(this.Position.X, this.Position.Y+1); where 1 is how far to move it down.

Re: How do I get my enemy to go down screen

Gamesmaster3 — Fri, 18 Apr 2008 01:59:02 GMT

Jim W:
You forgot to set the new position. You have an UpdateMovement, but it never modifies the sprites Position value.

Alright I guess I'm missing something then I thought that's what the MOVE_DOWN variable was for.Could you give me a quick example?

Re: How do I get my enemy to go down screen

Jim Welch — Fri, 18 Apr 2008 01:53:38 GMT

You forgot to set the new position. You have an UpdateMovement, but it never modifies the sprites Position value.

How do I get my enemy to go down screen

Gamesmaster3 — Fri, 18 Apr 2008 01:47:51 GMT

I was working on my vertical shooter.Right now I'm working on my enemy class.For rival planes.What I'm trying to do is to get the plane to appear on a random portion on the x axis which it does.And then for it to move down the screen.The problem is the plane is not moving down the screen and I can't figure out exactly why.Can anyone tell me what I forgot to add?

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Storage;
using Microsoft.Xna.Framework.Audio;

using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;

using System;
using System.Collections.Generic;
using System.Text;

namespace VerticalShot
{
    class Enemy : Sprite
    {
        Random Enemy_Start_Position = new Random();
        const string ENEMY_ASSETNAME = "enemy";
         int START_POSITION_X = 0;
        const int START_POSITION_Y = -3;
        const int ENEMY_SPEED = 160;
        const int MOVE_DOWN = 1;

        Vector2 mDirection = Vector2.Zero;
        Vector2 mSpeed = Vector2.Zero;

        public void LoadContent(ContentManager theContentManager)
        {
            START_POSITION_X = Enemy_Start_Position.Next(700);
            Position = new Vector2(START_POSITION_X, START_POSITION_Y);
            base.LoadContent(theContentManager, ENEMY_ASSETNAME);
        }

        public void Update(GameTime theGameTime)
        {
            UpdateMovement();
            base.Update(theGameTime, mSpeed, mDirection);
        }

        private void UpdateMovement()
        {
            mSpeed = Vector2.Zero;
            mDirection = Vector2.Zero;

            if(START_POSITION_Y < 650)
            {
                mSpeed.X = ENEMY_SPEED;
                mDirection.Y = MOVE_DOWN;
            }
        }
    }
}