const
PatternX := 160;
PatternY := 80;
procedure GetCoord;
begin
mX := MouseX div PatternX;
mY := (MouseY div PatternY) * 2;
DeltaMouseX := mX * PatternX - (mY AND 1) * PatternY;
DeltaMouseY := mY * (PatternY div 2);
end;
screen coord to ISO map
Author
Hi.
I find some examples how to get screen (mouse) coordinates to isometric map tile coordinate, but always i get not so "fine" result ((
Maybe some get sample in Delphi (optional Powerdraw) how I can calculate that coordinates.
My today code is
Here is how I got it to work.. spend quit some time geting it to work.. But I finally got something that works (for me anyway) 
m2b = Mouse To Board (Board = cell)
b2m = Board To Mouse
m2b = Mouse To Board (Board = cell)
b2m = Board To Mouse
Procedure m2b(mx,my:Integer; Out FeltX,FeltY:Integer);var xx,yy:Integer; offset:Single;Begin //Find ca. feltet (kantet) FeltX:=mx div CellWidth; FeltY:=(my div CellHeight)*2; xx:=FeltX * CellWidth + HalfCellWidth; yy:=FeltY * (HalfCellHeight) + HalfCellHeight; offset:=(HalfCellHeight) / (HalfCellWidth); //Find det præcise felt If mx > xx then begin if my > yy then begin if my > yy+Round(offset * (mx-xx-HalfCellWidth)*-1) then Inc(FeltY) end else begin if my < yy-Round(offset * (mx-xx-HalfCellWidth)*-1) then Dec(FeltY) end; end else begin if my > yy then begin if my > yy-Round(offset * (xx-mx-HalfCellWidth)) then begin Inc(FeltY);dec(FeltX);end; end else begin if my < yy+Round(offset * (xx-mx-HalfCellWidth)) then begin Dec(FeltY);dec(FeltX);end; end; end;end;Procedure b2m(FeltX,FeltY:Integer; Out wX,wY:Integer);Begin wX:=(FeltX * CellWidth) + ((FeltY mod 2) * (HalfCellWidth)); wY:=(FeltY * (HalfCellHeight)); wX:=wX+HalfCellWidth; wY:=wY+HalfCellHeight;end;
Author
Thanks.
But its not stil working correct for me :-((
But mayby its not so vital at now....
But its not stil working correct for me :-((
But mayby its not so vital at now....
This is the way I did it:
function TDXCGIsoMap.PointToCell(X,Y : Integer): TPoint;
Var
BX,BY,CX,CY,DX,DY,AD, BD : Integer;
begin
X := X + MapLeft+32;
Y := Y + MapTop;
Y := Y - 192;
BX := X div 128;
BY := (Y div 64)*2;
DX := ABS(((BX * 128) + 64) - X);
DY := ABS((((BY div 2) * 64) + 32) - Y);
AD := DX + 2 * DY;
X := X - 64;
Y := Y + 32;
CX := X div 128;
CY := (Y div 64) * 2 - 1;
DX := ABS(((CX * 128) + 64) - X);
DY := ABS((((CY div 2) * 64) + 96) - Y);
BD := DX + 2 * DY;
If AD < BD then
Begin
Result := Point(BX,BY);
End
Else
Begin
Result := Point(CX,CY);
End;
end;
A couple of pointers. My min top point of the map is at 192, my min left is 32. Isometric squares are 128x64.
Why those exact figures work I dont know but they do
The theory is as follows.
1. For any point there are two possible squares - find these two squares
2. For each square check if the point is in a corner - if it is then this is not the square selected.
3. Remember to incluse the offset of the odd numbered rows
Hope it helps.
function TDXCGIsoMap.PointToCell(X,Y : Integer): TPoint;
Var
BX,BY,CX,CY,DX,DY,AD, BD : Integer;
begin
X := X + MapLeft+32;
Y := Y + MapTop;
Y := Y - 192;
BX := X div 128;
BY := (Y div 64)*2;
DX := ABS(((BX * 128) + 64) - X);
DY := ABS((((BY div 2) * 64) + 32) - Y);
AD := DX + 2 * DY;
X := X - 64;
Y := Y + 32;
CX := X div 128;
CY := (Y div 64) * 2 - 1;
DX := ABS(((CX * 128) + 64) - X);
DY := ABS((((CY div 2) * 64) + 96) - Y);
BD := DX + 2 * DY;
If AD < BD then
Begin
Result := Point(BX,BY);
End
Else
Begin
Result := Point(CX,CY);
End;
end;
A couple of pointers. My min top point of the map is at 192, my min left is 32. Isometric squares are 128x64.
Why those exact figures work I dont know but they do
The theory is as follows.
1. For any point there are two possible squares - find these two squares
2. For each square check if the point is in a corner - if it is then this is not the square selected.
3. Remember to incluse the offset of the odd numbered rows
Hope it helps.
This topic is closed to new replies.
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