vb; Get screen x/y by isometric tile x/y

can anyone help me in the right direction of this math

You want to know which TILE your mouse is on by the coordinates on the screen? Or do you want to know, say, coordinates to draw a tile, by the x and y position of the tile?

Heres how to get a tile x/y by where the mouse is:

VB Code:

Public Sub PointToTile(ByRef FlatX As Integer, ByRef FlatY As Integer, ByRef IsoX As Integer, ByRef IsoY As Integer)
        Dim Z As Integer
        Dim TileFlatWidth As Integer = TILEW / 2
        Dim TileFlatHeight As Integer = TILEH
 
        Dim TileHalfHeight As Single = TILEH / 2
        Dim TileHalfWidth As Integer = TILEW / 2
        Dim TileHeight As Integer = TILEH
        Dim TileWidth As Integer = TILEW
 
        Z = (TileCountX) * TileHalfWidth
 
        IsoX = (FlatX - Z) \ 2
        IsoY = FlatY - IsoX
        IsoX = IsoX + FlatY
 
        IsoX = Int(IsoX / TileFlatWidth)
        IsoY = Int(IsoY / TileFlatHeight)
 
    End Sub

Call it like this:

VB Code:

Dim TileX,TileY, MouseX,MouseY as Integer
MouseX=Cursor.Position.X
MouseY=Cursor.Position.Y
TileX=MouseX
TileY=MouseY
 
PointToTile(MouseX,MouseY,TileX,TileY)
 
'Now tileX and tileY are the x and y of which tile your mouse is over.

EDIT: P.S., I didn't make this function up. Someone from these forums gave me it, and I kind of changed it a little.

And if you want to get the coordinates of where to draw an ISO tile onto the screen by the X and Y of the ISO tile, heres how to do that:

Code:

---

This will give you the coordinates of this point where the X is:

X#########################################
#                  0                    #
#            0          0              #
#      0                        0      #
# 0                                    0 #
#      0                        0      #
#            0          0              #
#                  0                    #
##########################################

The #'s make up the box around the iso tile, and the 0's make up the iso tile.
The X is where the coordinates to draw are.

---

VB Code:

'TileX and TileY is the iso tile coords, 
'for example, 0,0, 0,1, 3,3, etc. 
'Usually goes to about 16,16.
 
'NewX and NewY are the X and Y coords
'On the screen, of the top left of an iso
'tile, which is where you would draw the tile
 
 
'Set the new X to the middle of the screen
NewX = SCREENW / 2 
'Move the new X to the left, by half the width of a tile
NewX -= TILEW / 2
'Set the new Y to 0 (top of the screen)
NewY = 0
 
'Increase the newX by half the tile width multiplied by the ISO tile X
NewX += TileX * (TILEW/2)
'Increase the newY by half the tile height multiplied by the ISO tile X
NewY += TileX * (TILEH/2)
'Increase the newX by half the tile width multiplied by the ISO tile y
NewX -= TileY * (TILEW/2)
'Increase the newY by the tile height multiplied by the ISO tile y
NewY += TileY * TileH
 
 
'Optional: If your sprites vary in Height:
'Decrease the newY by any height past the regular tile height
NewY -= Sprites(SpriteID).SurfaceDescription.Height - TILEH

your last post tha is what i ment and BTW to convert mouse x/y to isox/y i made that function with help from electroman
:wave: