Numeric representation of the location of an entity in the game space. There are multiple forms of coordinate systems to cater to a variety of methods to map position.
3
votes
2answers
2k views
Java Slick2d - How to translate mouse coordinates to world coordinates
I am translating in my main class render. How do I get the mouse position where my mouse actually is after I scroll the screen
public void render(GameContainer gc, Graphics g) throws SlickException
...
2
votes
1answer
837 views
Obtaining a world point from a screen point with an orthographic projection
I assumed this was a straightforward problem but it has been plaguing me for days.
I am creating a 2D game with an orthographic camera. I am using a 3D camera rather than just hacking it because I ...
8
votes
4answers
1k views
Staggered Isometric Map: Calculate map coordinates for point on screen
I know there are already a lot of resources about this, but I haven't found one that matches my coordinate system and I'm having massive trouble adjusting any of those solutions to my needs.
What I ...
5
votes
3answers
1k views
2D isometric: screen to tile coordinates
I'm writing an isometric 2D game and I'm having difficulty figuring precisely on which tile the cursor is. Here's a drawing:
where xs and ys are screen coordinates (pixels), xt and yt are tile ...
5
votes
3answers
3k views
Why / how does XNA's right-handed coordinate system effect anything if you can specify near/far Z values?
I am told repeatedly that XNA Game Studio uses a right-handed coordinate system, and I understand the difference between a right-handed and left-handed coordinate system. But given that you can use a ...
3
votes
3answers
2k views
HTML5 canvas screen to isometric coordinate conversion
I am trying to create an isometric game using HTML5 canvas, but don't know how to convert HTML5 canvas screen coordinates to isometric coordinates.
My code now is:
var mouseX = 0;
var mouseY = 0;
...
2
votes
3answers
1k views
Get points on a line between two points
I'm making a simple space game in JavaScript, but now I've hit a wall regarding vectors.
The game view is top-down on a 2d grid. When the user clicks on the grid, the space ship will fly to that ...
5
votes
1answer
516 views
Tile coordinates
Simple question I have here.
Say my tile map is based on 32x32 tiles for an 800x600 image so let's say 25 tiles across and 19 down.
So now I have that cell 0 of any row contains the first 0-31 ...
3
votes
1answer
405 views
How do you get an object to orbit around a certain point on a 2d plane?
I had a concept for a game come to me this morning but I can't figure out how I'd go about implementing the movement.
The general idea involves the left and right controls causing a sprite to go ...
2
votes
1answer
324 views
How to linearly transform vertices for large coordinate systems
Alright, so I'm working on a space game and well, I want it to have a lot of space! So I need a large coordinate system and for my rendering pipeline to not suffer from "vertex jittering" due to ...
2
votes
2answers
376 views
Swapping axis labels between 2D and 3D coordinates
My game world is 3D.
The map is only 2D, however.
It is natural to think of the map as having an X and Y axis.
And it is natural to think of the world has having an X, Y and Z axis, where Y is ...
1
vote
2answers
278 views
What is the Box2D coordinates system?
I know that for Box2d I need to translate pixels to meters which is easy peasy. However my problem is what is the orientation of Box2D coordinates system? Is this the same as screen one (right += x, ...
0
votes
0answers
140 views
Converting motionevent.getx and motionevent.gety to pixel or Object coordinates in the view
I am trying to draw buttons using OpenGL I have added a Gesture Listener for the GLSurface View now i have motionevent when ever the user touches. My question is how can i convert motionevent.getx and ...
