Convert screen coordinate to map coordinate

Hi
I have a question if there is any method in MapViewer that convert screen
coordinates to map coordinates.
Fredrik

getUserPoint(int x, int y)
Gets the user space point corresponding to the mouse click.
getUserPoint in Java API converts from screen to user space ( lat/lon or whatever coordinate system you are using)

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XY pixel coordinate to map coordinate!

Hi,
I don't know if anyone is able to help me or direct me in the right path.
My situation is as follows:
I'm writing an web-app to generate a map (which I am successfully doing). I display the map (GIF) on the browser.
Now, what I would like is to be able to click on a point on the map, take the X Y pixel coordinate and convert that to a mapping coordinate so I can requery the server and generate a new map.
Now, in terms of mapping coordinates,
how would one convert XY pixel to LAT LON?
how would one convert XY pixel to Mercator?
how would one convert XY pixel to GeoMinSec?
hou would one convert XY pixel to GeoDecimal?
Now, I don't mind if can get an answer to one of either of those questions, but my ideal answer would be on how to convert XY pixel to GeoDecimal because unfortunately the server I am using has all of its map coordinates in GeoDecimal.
Any help would be appreciated.
Steve.

i think this is the solution.... but i might be missing something, i am assuming that your x,y location of your mouse increases positivly as you move your mouse right and down from the top left of your image. you may need to adjust accoringly. also, i have a feeling i am missing something to do with the dpi of your image... but i guess this may be a start...
so you know your x,y in pixels. you know the extent of your map in real world co-ordinates.
so lets say the width of your map is 1000m and the pixel width is 500pixels.
so each pixel is 0.5 real world metres.
multiply your x and y co-ordinates by 0.5, that is how many meters in from the top left of your extent your mouse is.
more generally:
so your extent is (x1,y1 is bottom left, x2,y2 is top right):
x1,y1;x2,y,2
your mouse co-ordinates are :
x,y (pixels in from top left)
your map is w1 pixels wide.
dx = x2 - x1
pixelsPerMetre = w1/dx
world coordinates of x,y are:
x1 + (x * pixelsPerMetre), y2 + (x * pixelsPerMetre)

Map coordinate to screen coordinate algorithm

I am working on a simple 2d RPG, but I ran into a problem while working in NPCs.
Currently the player is fixed at the center of a panel and the map scrolls below him. The panel the character and map are drawn on is only 1000 by 520 pixels and the map image can be any size (currently testing with a 3000x1565 BufferedImage)
I tried drawing the NPC's sprite on to the BufferedImage, and quickly realized that wasn't going to work for any kind of smooth animation (you would have to redraw the BufferedImage off screen each time the NPCs AI thread told him to move, which means the BufferedImage may or may not be complete when the panel was repainted by the player's animation thread) . I need to determine weather NPCs are on the screen and then translate or transform their map coordinate to screen (or panel) coordinates.
I did a search on the forum, but couldn't find a quick answer if someone could help me out I'd appreciate it.

kevinaworkman wrote:
I guess I'm still trying to make sense of how you're trying to draw the NPCs that could be causing so much trouble. Is there any way you could provide some pseudocode, or better yet, an SSCCE ?Well, its kind of complex and probably set up all wrong so let me just explain as best I can whats going on.
First of all Like I said i am trying to make a 2d rpg, but I may want to make it an online multiplayer thing later if I even finish the game. So its a java applet and so far it has two GUI components. What I call the Map an extension of Panel that is in charge of drawing the world that the player moves around on. The other GUI component isn't really important right now its just the console for the game (a text field and a text area you can type in).
The map class contains a bunch of other stuff the most important things are, an array of Characters for keeping track of NPCs, as well as possible other players, a PlayerCharacter, and most import is the zone. The zone is a Class I created for storing the map itself, and the constructor reads form a text file to create the map. The text contains stuff like the type of tile (grass, sand w/e) to fill the map with, size of the map, and points of interest like where to draw building, zone lines to other zones, and also where all the npcs start at or spawn at.
the Map classes paint function looks like this:
public void paint (Graphics g)
        //draw map
        g.drawImage(zone.getMapImage(), 0, 0, getWidth(), getHeight(),
            player.mapX - getWidth()/2, player.mapY - getHeight()/2 ,
            player.mapX + getWidth()/2, player.mapY + getHeight()/2 , this);
        //draw player
        g.drawImage(player.getAvatar(), player.x, player.y, this);
        //draw UI
        g.setColor(Color.darkGray);
        g.fillRect(0, 0, 150, 50);
        g.setColor(Color.blue);
        g.drawString("Player", 5, 5);
        if (player.getTarget() != null)
            g.setColor(Color.darkGray);
            g.fillRect(155, 0, 150, 50);
            g.setColor(Color.blue);
            g.drawString(player.getTarget().name, 160, 5);
        for (int i = 0; i < npcs.length; i++)
            if (npcs.isDraw())
g.drawImage(npcs[i].getAvatar(), npcs[i].x, npcs[i].y, this);
}//end paint()
The Character class controls the animation for the sprites with these method (now don't laugh, lol, this was my first attempt at making a full game and animating sprites so =P)public void move(String com)
int zoneW = inZone.getWidth();
int zoneH = inZone.getHeight();
int avatW = avat[avatIndex].getWidth();
int avatH = avat[avatIndex].getHeight();
if ( com.equalsIgnoreCase("up") )
mapY= mapY - 5;
if (direction != 6)
time = 0;
direction = 6;
if (mapY < 0)
mapY = 0;
else if ( com.equalsIgnoreCase("right") )
mapX = mapX + 5;
if (direction != 9)
time = 0;
direction = 9;
if (mapX + avatW > zoneW)
mapX = zoneW - avatW;
else if ( com.equalsIgnoreCase("down") )
mapY = mapY + 5;
if (direction != 0)
time = 0;
direction = 0;
//System.out.println("y: " + mapY);
//System.out.println("y + avat height: "+ (mapY +avat[avatIndex].getHeight()));
if (mapY + avatH > zoneH)
mapY = zoneH - avatH;
else if ( com.equalsIgnoreCase("left") )
mapX = mapX - 5;
if (direction != 3)
time = 0;
direction = 3;
if (mapX < 0)
mapX =0;
startAnimate();
* @see java.lang.Runnable#run()
public void run() {
// lower ThreadPriority
Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
while (/*true */isAnimate)
if (time == 0)
avatIndex = direction;
else if ( time == 3 )
avatIndex = direction + 1;
else if (time == 6)
avatIndex = direction;
else if (time == 9)
avatIndex = direction + 2;
else if (time > 12)
time = -1;
time++;
try
// Stop thread for 10 milliseconds
Thread.sleep(animationDelay);
catch (InterruptedException e)
e.printStackTrace();
// set ThreadPriority to maximum value
Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
} //end isAnimate loop
tFinished = true;
}//end run()
public void startAnimate()
isAnimate = true;
if (animate == null || tFinished)
animate = new Thread(this);
if (!animate.isAlive())
tFinished = false;
animate.start();
else
public void stopAnimate()
isAnimate = false;
avatIndex = direction;
What you don't see is that "avatIndex" is used by the following method to return the correct sprite image for the animation.public Image getAvatar()
return avat[avatIndex];
//return sheet;
Its not giving me too much trouble to draw the NPCs, when I had problems with drawing NPCs to the map image I just figured it would be best to drawing on the screen and not the map. But I couldn't figure out how to translate the two coordinate systems.
This post may confuse readers a lot lol, so possibly just forget you asked.

Coordinate of map in identify?

HI,,,,
today in my application I use the coordinate of screen in method identify, would like to know if it is possible to use coordinate of map in the method of identify, zoomIn, zoomOut and pan?

Hi Junior,
the identify methods use values in screen coordinates. But with the AffineTransformation of the MapResponse class you may be able to handle the map coordinate on your application. You can convert it to screen before calling the identify, zoomIn, and other methods.
This post may help:
Re: MapViewer and getScreenCoordinate
Joao

Map coordinates in MapViewer

Hi,
I have a Java application that submit requests to MapViewer. MapViewer4s response is a XML document, something like:
<?xml version="1.0" encoding="UTF-8" ?>
<map_response>
<map_image>
<map_content url="http://map.oracle.com/output/map029763.gif" />
<box srsName="default">
<coordinates>-122.260443,37.531621 -120.345,39.543</coordinates>
</box>
<WMTException version="1.0.0" error_code="SUCCESS"/>
</map_image>
</map_response>
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All of this is working fine. Now I4m trying to make something more complicated.
What I want to do is caught the user4s mouse click in the image and translate the point in which the user clicked (pixels) to a point in the map coordinates (longitude, latitude).
How can I do this ? What API may I use ?
Thanks,
Rodrigo

The <BOX> element in the XML map response gives you the bounding box of the returned map image, in user's coordinate space.
Now you can get the mouse click's x,y in terms of pixels, and you also know the map image's width/height in terms of pixels. It should be easy to translate the click's position into user space.
lj

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In interface mapping, XSLT mapping on 1st position & Graphical mapping on 2nd position.
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>
Narendra GSTIT wrote:
> I dont want to test standalone XSL Code.
>
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>
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If it is then click on the Mac OS partition of your hard drive in the left hand list. Then select the First Aid Tab and run Repair Disk. The Repair Disk button won't be available until you've clicked on the Mac OS partition on your hard drive. If that repairs any problems run it again until the green OK appears and then run Repair Permissions.
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Convert screen coordinate to map coordinate

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