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  MiniMap For SideScrolling 2D game  (Read 1461 times)
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Offline Neddy

Junior Newbie




Java games rock!....Big Time?


« Posted 2003-12-18 11:26:49 »

Hey,

Im trying to put a minimap into my level editor for my SideScrolling 2D game. The area in which the level is drawn is within a JPanel, that is put into a JScrollPane, which then is put into a Jpanel, which is a tab on a JTabbedPane. All thats need to deal with the size changing ability of a map, because the user specifies the size, and a zoom in out feature is availible.

Anyway, i want to take the map the the Map JPanel is drawing, and shrink it down, and display it on another JPanel, as a miniMap.

I thought this would be rather easy, but cant get it too work. Ive tryed 2 ways, both times tring with both plain images, and buffered images.

1.
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Image image;
Graphics image_g = image.getGraphics();
...
public void paintComponent(Graphics g) {
      ....
      paintComponent(image_g);
}


At the time this seemed like a good idea, but once it stuffed up, i actually bothered to think about it a little, and it seemed to me that this code would loop around and stuff up.

2.
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Image image;
Graphics image_g = image.getGraphics();
...
public void paintComponent(Graphics g) {
      paintCommon(g);
      paintCommon(image_g);
}

public void paintCommon(Graphics g) {
      ...
}


This one didnt work ethier ofcourse, although i saw at the sun developer corner a post about this topic, and thats wat the answer was. However, i think my problem is something to do with the way im trying to get the images Graphics, as i think that even if i eleminated any painting to it, just trying to get it, still froze the program.

Thanx For any help.
Offline Jeff

JGO Coder




Got any cats?


« Reply #1 - Posted 2003-12-18 18:28:10 »

It seems to me your fundamental problem is logical not code.

Ever point a video camera at its own monitor?  It recurses into infinity.  This is called video feedback.

If your sub-image is part of your main image and you are trying to blt your main image INTO your sub-image then you have the same exact problem.

The solution is NOT to render to screen but to render to an off-screen image and then use that as the source for both BLTs.

Got a question about Java and game programming?  Just new to the Java Game Development Community?  Try my FAQ.  Its likely you'll learn something!

http://wiki.java.net/bin/view/Games/JeffFAQ
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