[Solved]Having trouble with drawing the right way (Top-Down Tile Game)

[hapsburgabsinth]

I'm having trouble drawing the right way it seems, it takes about 500-800 milliseconds to complete a single loop in my render method. Any suggestions or links that might explain what to do. Can't find anything on the forum, please help!


This is my render code:

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public class GamePanel extends Canvas{    private BufferedImage backBuffer;    private int windowHeight;    private int windowWidth;    private ZompocalypseGame game;    private GUI gui;    private Position position;    public GamePanel(int windowWidth, int windowHeight, ZompocalypseGame sGame, GUI gui){       setIgnoreRepaint(true);       this.windowWidth = windowWidth;       this.windowHeight = windowHeight;       setVisible(true);       this.game = sGame;       this.gui = gui;       this.position = new Position(0,0);             this.backBuffer = new BufferedImage(this.windowWidth, this.windowHeight, BufferedImage.TYPE_INT_RGB);    }    public void draw(){       Graphics2D g = (Graphics2D) getGraphics();             g.setColor(Color.BLACK);       g.fillRect(0, 0, windowWidth, windowHeight);             g.drawImage(this.backBuffer, 0, 0, this);       g.dispose();    }    public void render() {       Graphics2D bbg = (Graphics2D) this.backBuffer.getGraphics();       BufferedImage image = null;             Player player = this.game.getTileMap().getPlayer();       long foo = System.currentTimeMillis();             for(int y = 0; y < 24; y++){          for(int x = 0; x < 42; x++){             position.setX(x + player.getPosition().getX()-21);             position.setY(y + player.getPosition().getY()-12);             int yOffset = 0;             //Draw tiles             Tile tile = this.game.getTileMap().getTileAt(position);             if(tile != null){                image = tile.getImage();             }else{                tile = new Tile(position, "WATER");                image = tile.getImage();             }             //Draw items             Item item = this.game.getTileMap().getItemAt(position);             if(item != null){                image = item.getImage();             }             //Draw buildings             Building building = this.game.getTileMap().getBuildingAt(position);             if(building != null){                image = building.getImage();             }             //Draw units             Unit unit = this.game.getTileMap().getUnitAt(position);             if(unit != null){                image = unit.getImage();                yOffset = -40; //Unit height             }                         bbg.drawImage(image, x*20, y*20+yOffset, this);                         bbg.setColor(Color.WHITE);             bbg.fillRect(0, 580, 800, 20);                         bbg.setColor(Color.BLACK);             bbg.drawString(String.valueOf(gui.getFps()), 10, 595);          }       }       long bar = System.currentTimeMillis();       System.out.println(bar - foo);    } }

[steveyO]

Haven't really looked at the code but at a glance would suggest to create your background image outside your main loop,and in your main loop simply render your 'already created image' background..

[hapsburgabsinth]

Can you specify, I don't quite understand what you mean

Also found out that I should use a canvas and not a JPanel to draw on, but it didn't help though....

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[theagentd]

1	bbg.fillRect(0, 580, 800, 20);

Don't fill 800*20 * 24*42 = 16 128 000 pixels per update?

[delt0r]

well the only thing i can see that would make it slow is the image format. Create your bufferedImage with GraphicsDevice.createCompatableImage();. Any colour space/format conversions fall back to a really slow software renderer.

In fact you should copy all your images onto a compatible image.  For example using ImageIO to load a jpg will return a BufferedImage in a YCrCb or whatever colour space in some cases.

[hapsburgabsinth]

I already use ImageIO, but it's in the tile class, and I use .png


This is the code I use in Tile.class:

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public BufferedImage getImage() {       BufferedImage image = null;       try{          image = ImageIO.read(new File("bin/image/tile/" + this.type + ".png"));       }catch (Exception e) {          System.out.println("Couldn't find " + this.type + "'s image file!");       }       if(this.isTargeted){          Graphics2D g2d = image.createGraphics();          // Draw on the image          g2d.setColor(Color.red);          g2d.fill(new Ellipse2D.Float(0, 0, 20, 20));          g2d.dispose();       }       return image;    }

[Lordpomeroy]

There you find the problem: You are loading your image everytime.

[hapsburgabsinth]

1	bbg.fillRect(0, 580, 800, 20);

Don't fill 800*20 * 24*42 = 16 128 000 pixels per update?

Where do you get that calculation from?

[delt0r]

My point wasn't to use ImageIO. But that ImageIO will often use a incompatible image format from the device. So that draw image will result in a colour translation per pixel rather than just a mem copy of the data to the video memory. 

[hapsburgabsinth]

There you find the problem: You are loading your image everytime.

Now I load the image in the constructor, and it got better, down at 200+ milliseconds, but not quite the time i hoped for... Was aiming for 16 milliseconds (to reach 60 fps)... would it help to only load into memory the images that I draw?

If so, how would I do such a thing?

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[delt0r]

Are you even reading the posts?

[hapsburgabsinth]

I can't find the method, that you are referring to

And I meant loading ONLY the images that I draw into memory

[theagentd]

1	bbg.fillRect(0, 580, 800, 20);

Don't fill 800*20 * 24*42 = 16 128 000 pixels per update?

Where do you get that calculation from?

Your loops:

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for(int y = 0; y < 24; y++){      for(int x = 0; x < 42; x++){

24*42 times runs.

1	bbg.fillRect(0, 580, 800, 20);

Fills a rectangle 800x20 pixel rectangle at (0, 580). This is done ONCE FOR EACH LOOP = 24*42 times * 800*20 pixels. Why are you filling a that big rectangle for each tile AT THE SAME PLACE every loop? My post was supposed to make you notice that. 

[hapsburgabsinth]

Ohh I feel stupid, will look into that Thanks

[hapsburgabsinth]

Just to make things anymore cryptic (for me especially), when I move around, the time it takes to do the loop is going towards 16 (as I want).... Still having 200+ in the start though o.O

I really can't figure this out myself, my knowledge on this area isn't enough

[ra4king]

This is how you create a compatible image (lines 101-113).

As others have pointed out:
- Try to do as little drawing calls as possible, Java2D is quite slow.
- Don't load images in your loop
- Try to create as little number of objects in your loop
- Find better ways than using lots of for loops

EDIT: I took a good look at your render() method:
- I believe theagentd pointed out, don't fillRect 24*24 times! This should only be done once and on the whole image.
- Why are you drawing the FPS 24*24 times?! This should also be done once and at the end of your render() method.

[hapsburgabsinth]

This is how you create a compatible image (lines 101-113).

As others have pointed out:
- Try to do as little drawing calls as possible, Java2D is quite slow.
- Don't load images in your loop
- Try to create as little number of objects in your loop
- Find better ways than using lots of for loops

Thanks again a lot I just found out, that if I don't have any null tiles on my screen it only takes 1-7 milliseconds to draw, so it must be something with the null tiles I draw... Just have to figure out how to solve that problem

Would need to make my player go off center when he reaches the edge of the world.....

But I will look into the link you posted

And thanks to delt0r and Lordpomeroy too

[ra4king]

If the Tile is null, you create a new Tile object, which means.......what is in your Tile constructor? Looks like you are loading the "WATER" image every time

[hapsburgabsinth]

You're having a point there... Even though I fixed that.... But it works after I just created a null tile, and just using that tiles image

It down to 1-6 time in milliseconds now!

I'm so happy, have been working on those two problems I've posted to day for like a month!!!!

Gave an appreciate to everyone who helped

[hapsburgabsinth]

Of cause, now I see the problem... The problem was that I created a new tile if the tile was null, and in the constructor I loaded the image