Hey everyone,

I am in the middle of trying to write an RPG game and I am kinda stuck. If you have played a 2D rpg you know there are usually maps that you travel through to get to little bitmap towns that then take you into the town and all that stuff. I am stuck at the part where I just have a certain part of the map being shown. I figured that I would draw the map, then draw the character and have the loop rerender the screen based on what the coordinates of the character are. This probably doesn't make a lot of sense, so If you need any more info let me know. Thanks in advance for any help.

WWaldo

This method of the canvas class may be useful:

http://developer.android.com/reference/ ... s.Paint%29

One method for such 2d bitmaps is to use a tile based setup (think super mario bros). All the classic SNES rpg's used something similar. It is fairly easy to figure out which tiles are currently on the screen based on the player coord, and then you would only draw those tiles. This can be done in pure 2d using the Canvas class or in 3d using opengl.

Okay,
I think what I need is the rect thing, I can't do the tiles because I an converting a hand drawn image into a bitmap, unless there is another way to figure that out. I was wondering if you had any idea how to stop it from chugging though. I did a sample just to see how it would work, and it worked fine, but it was really slow, and it was only a 60kb file. The just have it drawing the rect of a certain part of the bitmap, so i figured it would be okay, I am in a hurry so I may have missed something, let me know if you need code.
Thanks

Do both rects have the same size? How bigger is the Bitmap respect to the canvas?

Hrmmmm, the size is a good question, I will have to check when I get home. I kinda threw it together yesterday. I read somewher that I needed to redefine the bitmap and use surfaceChanged or something, but I couldn't get that to work last night.

The image is 1000x1000 pixels, so I think it would have to be the different rect sizes so Ill check it out later, thanks

This code may be useful for you (I'm using it and it draws a 1000x1000 bitmap on canvas in 2ms, on an HTC Tattoo):

I tried implementing what you suggested, took me a while to figure out that I needed to initialize my bitmap somewhere, and once I did that I kept getting a black screen. I am not sure if I screwed up something with the rects or what. I'll leave my code here, maybe someone can find what I did wrong while I look. Thanks for the code before btw, it made a lot more sense than my, update inside the onDraw way of doing it XD.


Edit:
I figured out that the rectangles aren't being defined correctly, so I will have to mess with that tomorrow, and screw around with the scrolling stuff too

Well, the code I passed you yesterday was a View, you can set it this way:

Code: Select all

public void onCreate(Bundle savedInstanceState) {
    BackgroundView view = new BackgroundView(this, R.drawable.bg)
    setContentView(view).
}

I have a modified version extending a SurfaceView, if you can't find where your version fails I'll post the code when I arrive home. Good luck!

Okay, I was messing with it earlier, got the bitmap to show up, but the scrolling isn't working. I tried something a bit different, made my onTouchEvent turn on or off a boolean and store some variables and then I have a updateBitmapDim to update the display rectangle for the bitmap based on the new coordinates with respect to the place where ACTION_DOWN happened. I am not sure if I did something wrong or if what I want to do just won't work, so I will leave my code.

Sure it doesn't work? I just tested with this code and everything went perfect :S:

Code: Select all

package org.gskbyte.splineTest;

import org.gskbyte.splineTest.background.BackgroundView;

import android.app.Activity;
import android.os.Bundle;

public class SplineTest extends Activity
{
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
       
        BackgroundView v = new BackgroundView(this, R.drawable.suelo);
        setContentView(v);
    }
}

You used my code with the backgroundview part in the onCreate? Its part of view isn't it? I hate to ask but can you post the code that you used? You've helped me a lot, so thanks again

No I tried the code I just posted. I'm going to try the code you posted two entries before, I'll tell you now.

Oh, I was trying to implement yours over mine, so thats probably why it wasn't working. Worse comes to worse I'll just use yours in total.

Okay, I finally got this code to work, I think it was never changing the x and ys or something. It looked laggy but i think that was just the emulator being stupid. And it was, just checked on my phone, and once I get it going at a specific frame rate I guess it will look smoother.



Thanks for the help