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How to create isometric maps Turn on/off line numbers in source code. Switch to Orginial background IDE or DSP color Comment or reply to this aritlce/tip for discussion. Bookmark this article to my favorite article(s). Print this article
30-Aug-02
Category
Multimedia
Language
Delphi 2.x
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Publisher:
DSP, Administrator
Reference URL:
DKB
			Author: Tomas Rutkauskas

I'm planning to make an isometric map based game. Now, to do this, I need to know 
if the user clicked on one (or more) squares, for example, a building or a 
creature. I cannot figure out how to do this.

Answer:

Create a new project. On the form, create a TImage and align it to client. Also 
assign the form's OnCreate event, and the Image's OnMouseUp and OnMouseDown events. 
Paste this code into Unit1 and run. A 10x10 grid will be drawn. Click in it to 
highlight a square.


1   unit Unit1;
2   
3   interface
4   
5   uses
6     Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, 
7   ExtCtrls;
8   
9   type
10    TForm1 = class(TForm)
11      Image1: TImage;
12      procedure FormCreate(Sender: TObject);
13      procedure Image1MouseDown(Sender: TObject; Button: TMouseButton;
14        Shift: TShiftState; X, Y: Integer);
15      procedure Image1MouseUp(Sender: TObject; Button: TMouseButton;
16        Shift: TShiftState; X, Y: Integer);
17      procedure Image1MouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
18    private
19    public
20    end;
21  
22  var
23    Form1: TForm1;
24  
25  implementation
26  
27  uses
28    Math;
29  
30  {$R *.DFM}
31  
32  var
33    XC: Integer;
34    YC: Integer;
35    LastX: Single;
36    LastY: Single;
37  
38  const
39    Scale = 20;
40  
41  procedure Map(const WorldX: Single; const WorldY: Single; out DisplayX: Integer;
42    out DisplayY: Integer);
43  begin
44    DisplayX := Round(XC + Scale * (WorldX - WorldY) * 0.5 * Sqrt(3));
45    DisplayY := Round(YC + Scale * (WorldX + WorldY) * 0.5);
46  end;
47  
48  procedure UnMap(const DisplayX: Integer; const DisplayY: Integer; out WorldX: 
49  Single;
50    out WorldY: Single);
51  var
52    Sum: Single;
53    Diff: Single;
54  begin
55    Diff := (DisplayX - XC) / (0.5 * Scale * Sqrt(3));
56    Sum := (DisplayY - YC) / (0.5 * Scale);
57    WorldY := (Sum - Diff) / 2;
58    WorldX := Sum - WorldY;
59  end;
60  
61  procedure TForm1.FormCreate(Sender: TObject);
62  var
63    I: Integer;
64    X1: Integer;
65    Y1: Integer;
66    X2: Integer;
67    Y2: Integer;
68  begin
69    XC := ClientWidth div 2;
70    YC := ClientHeight div 2;
71    with Image1.Picture.Bitmap do
72    begin
73      Width := Image1.Width;
74      Height := Image1.Height;
75    end;
76    for I := -5 to 5 do
77    begin
78      Map(I, 5, X1, Y1);
79      Map(I, -5, X2, Y2);
80      with Image1.Picture.Bitmap.Canvas do
81      begin
82        MoveTo(X1, Y1);
83        LineTo(X2, Y2);
84      end;
85      Map(5, I, X1, Y1);
86      Map(-5, I, X2, Y2);
87      with Image1.Picture.Bitmap.Canvas do
88      begin
89        MoveTo(X1, Y1);
90        LineTo(X2, Y2);
91      end;
92    end;
93  end;
94  
95  procedure ColorizeCell(const Color: TColor);
96  var
97    PolygonData: array[0..3] of TPoint;
98  begin
99    if ((Abs(LastX) < 5) and (Abs(LastY) < 5)) then
100   begin
101     Map(Floor(LastX), Floor(LastY), PolygonData[0].X, PolygonData[0].Y);
102     Map(Floor(LastX), Ceil(LastY), PolygonData[1].X, PolygonData[1].Y);
103     Map(Ceil(LastX), Ceil(LastY), PolygonData[2].X, PolygonData[2].Y);
104     Map(Ceil(LastX), Floor(LastY), PolygonData[3].X, PolygonData[3].Y);
105     with Form1.Image1.Picture.Bitmap.Canvas do
106     begin
107       Brush.Style := bsSolid;
108       Brush.Color := Color;
109       Polygon(PolygonData);
110     end;
111   end;
112 end;
113 
114 procedure TForm1.Image1MouseDown(Sender: TObject; Button: TMouseButton;
115   Shift: TShiftState; X, Y: Integer);
116 begin
117   Unmap(X, Y, LastX, LastY);
118   ColorizeCell(clRed);
119 end;
120 
121 procedure TForm1.Image1MouseUp(Sender: TObject; Button: TMouseButton;
122   Shift: TShiftState; X, Y: Integer);
123 begin
124   ColorizeCell(clWhite);
125 end;
126 
127 procedure TForm1.Image1MouseMove(Sender: TObject; Shift: TShiftState; X, Y: 
128 Integer);
129 begin
130   ColorizeCell(clWhite);
131   Unmap(X, Y, LastX, LastY);
132   ColorizeCell(clYellow);
133 end;
134 
135 end.


			
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