Iso Engine Mouse Coordinates -[RESOLVED]-

Hi there,
by now, I've finished the graphical display of my Iso Engine.

I'm saving the Tiles in a 2dimensional Matrix, so my GameField looks like this...

GameTile GTMAP[10][10] =
{
1,1,1,4,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,
1,1,2,3,4,1,1,1,1,1,
1,1,1,2,3,1,1,1,1,1,
1,1,2,1,6,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,
}

Where every number stands for a different type of terrain (not hardcoded, of course).

Now, my question is: Given a paoint X(x/y) on the map (a mouse coordinate, to be precise), how can I check which tile I am in?

Since it's not standard rectacular, a normal division by height and width won't work, so my attempt was to first do the normal division to know where about i am, seperate the most likely tile into four triangles, use the formula y=kx+d for linear functions and get the max for my y coordinate this way...

Unfortunately, that's too slow...
Any ideas on how to do it?

If you know the height and width of a tile wouldn't it be something like this??

TileX = int(MousePosX/TileWidth)
TileY = int(MousePosY/TileHeight)

Or is that not quite what you want?

noteme he sayd NOT a rectangular so that is wrong.. lemme find a tutorial for you.

Quote:

---

Originally posted by nareth
noteme he sayd NOT a rectangular so that is wrong.. lemme find a tutorial for you.

---

That was not NoteMe...;)....SLH has hijacked my avatar..:D

gr my matrix is overloaded. sorry

Quote:

---

Originally posted by nareth
noteme he sayd NOT a rectangular so that is wrong.. lemme find a tutorial for you.

---

Well if it's not recrangular (implied by the array) then how are we to know what would be correct (considering that we don't know the actual shape)??

Quote:

---

Originally posted by NoteMe
That was not NoteMe...;)....SLH has hijacked my avatar..:D

---

Mwhahahaha!!

isometric he mentioned it in the title

Quote:

---

Originally posted by nareth
isometric he mentioned it in the title

---

Ah.

Surely he can just pretty much use the code he's already got to display the matrix on the screen, just 'reverse' the formula...

http://www.gamedev.net/reference/art...article747.asp

To convert between rectangular and isometric coordinates you just need to do a matrix transformation, you multiply the coordinate with a matrix of which columns are the vectors of how many times each step on rectangular will translate to isometric

First Step: Find out what region of the map the mouse is in.

RegionX=int(MouseX/MouseMapWidth)
RegionY=int(MouseY/MouseMapHeight)*2 {The multiplying by two is very important}

Second Step: Find out WHERE in the mousemap our mouse is, by finding MouseMapX and MouseMapY.

MouseMapX=MouseX MOD MouseMapWidth
MouseMapY=MouseY MOD MouseMapHeight


Third Step: Determine the color in the MouseMap at (MouseMapX,MouseMapY).


Fourth Step: Find RegionDX and RegionDY in the following table:

Color RegionDX RegionDY
RED -1 -1
YELLOW 0 -1
WHITE 0 0
GREEN -1 1
BLUE 0
1



Fifth Step: Use RegionX,RegionY, RegionDX, and RegionDY to find out TileX and TileY

TileX=RegionX+RegionDX
TileY=RegionY+RegionDY

That tutorial helped, thank you very much.
I really appreciate it.

hahaha @SLH, nice puppet bashing :D

here's the basic idea behind isometric projection, you multiply the vector from right with a transformation matrix with the rectangular coordinates to get the isometric coordinates.

http://www.vbforums.com/attachment.p...postid=1709902

Quote:

---

Originally posted by kedaman
hahaha @SLH, nice puppet bashing :D

---

Credit where credit's due. It was Electroman that did the avatar. :)

Quote:

---

Posted by SLH
Credit where credit's due. It was Electroman that did the avatar. :)

---

:D :D

Nice one Electroman ;) btw whats that av in yours suppose to be doing

What is the MouseMap?

Quote:

---

Posted by kedaman
Nice one Electroman ;) btw whats that av in yours suppose to be doing

---

Opps I missed the second half of your post some how......Its SLH's old avatar (the one with the smilie jumping out the toilet) but I turned it upside down and added water falling out the toilet ;).