Merge pull request 'feat/TD-003-simple-movement' (#2) from dev into main

Reviewed-on: #2

src/gohamster.pas

@@ -1,41 +1,58 @@
 program go_hamster;
-
 uses crt;
 
+{ Implement come back }
+{ Implement death on trace cross }
+{ Implement  }
+
 const
-      FieldSize = 82;
-      InterfaceHeight = 14;
-      MinScreenH = FieldSize;
+      GameFieldH = 33; { 33 }
+      GameFieldW = 40; { 40 }
+      CellSize = 2;
+      BorderSize = 1;
+      ScreenW = GameFieldW * CellSize + BorderSize * 2; { 82 }
+      FieldHeight = ScreenW - 3; {wtf? why? maybe later}
+      MinScreenH = FieldHeight;
       WidthCoefficient = 2;
-      MinScreenW = FieldSize * WidthCoefficient;
+      MinScreenW = ScreenW * WidthCoefficient; 
+      InterfaceBarH = ScreenW - GameFieldH * CellSize - BorderSize * 2; { 14 }
       FieldBorder = '#';
-      BorderWidth = 2;
-      DelaySizeMs = 50;
+      HamsterSymbol = '*';
+      DelaySizeMs = 100;
       EscCode = 27;
       CtrlCCode = 3;
+      ArrowLeftOrd = -75;
+      ArrowRightOrd = -77;
+      ArrowDownOrd = -80;
+      ArrowUpOrd = -72;
 
-function IsScreenValid: boolean;
+type
+    character = record
+        curX, curY, dX, dY: integer;
+    end;
+
+function IsTerminalValid: boolean;
 begin
-    IsScreenValid :=
+    IsTerminalValid := 
         (ScreenWidth >= MinScreenW) and (ScreenHeight >= MinScreenH)
 end;
 
-procedure PrintScreenHelp;
+procedure PrintTerminalHelp;
 begin
-    writeln('Increase your screen size and try again.');
+    writeln('Increase your terminal size and try again.');
     if ScreenWidth < MinScreenW then
     begin
-        writeln('Your screen width: ', ScreenWidth,
+        writeln('Your terminal width: ', ScreenWidth,
                 '. Required: ', MinScreenW, '.')
     end;
     if ScreenHeight < MinScreenH then
     begin
-        writeln('Your screen height: ', ScreenHeight,
+        writeln('Your terminal height: ', ScreenHeight,
                 '. Required: ', MinScreenH, '.')
     end
 end;
 
-procedure GetKey(var code: integer);
+procedure GetKey(var keyCode: integer);
 var 
     c: char;
 begin
@@ -43,15 +60,15 @@ begin
     if c = #0 then
     begin
         c := ReadKey;
-        code := -ord(c)
+        keyCode := -ord(c)
     end
     else
     begin
-        code := ord(c)
+        keyCode := ord(c)
     end
 end;
 
-procedure DrawLine(x, y, len: integer);
+procedure DrawLineX(x, y, len: integer);
 var
     i: integer;
 begin
@@ -61,50 +78,152 @@ begin
     GotoXY(1, 1)
 end;
 
-procedure DrawInterface;
+procedure DrawLineY(x, y, len: integer);
+var
+    i: integer;
 begin
-    DrawLine(1, InterfaceHeight, FieldSize * WidthCoefficient)
+    for i := 1 to len do
+    begin
+        GotoXY(x, y + i - 1);
+        write(FieldBorder)
+    end;
+    GotoXY(1, 1)
 end;
 
-procedure DrawField(x0, y0, size: integer);
+procedure DrawRectangle(x0, y0, h, w: integer);
 var
     i: integer;
 begin
     clrscr;
-    DrawLine(x0, y0, size * WidthCoefficient);
-    for i := 1 to size - 2 do
+    DrawLineX(x0, y0, w);
+    for i := 1 to h - 2 do
     begin
         GotoXY(x0, y0 + i);
         write(FieldBorder);
-        GotoXY(x0 + size * WidthCoefficient - 1, y0 + i);
+        GotoXY(x0 + w - 1, y0 + i);
         write(FieldBorder)
     end;
-    DrawLine(x0, y0 + size - 1, size * WidthCoefficient);
-    GotoXY(1, 1);
+    DrawLineX(x0, y0 + h - 1, w);
+    GotoXY(1, 1)
+end;
+
+procedure DrawInterface;
+var
+    cellW: integer = ScreenW div 3;
+begin
+    DrawLineX(1, InterfaceBarH, ScreenW * WidthCoefficient);
+    DrawLineY(cellW * WidthCoefficient, 1, InterfaceBarH);
+    DrawLineY(cellW * 2 * WidthCoefficient + 1, 1, InterfaceBarH)
+end;
+
+procedure DrawArena(ScreenW, FieldHeight: integer);
+begin
+    DrawRectangle(1, 1, FieldHeight, ScreenW * WidthCoefficient);
     DrawInterface
 end;
 
+function Clamp(val, min, max: integer): integer;
+begin
+    Clamp := val;
+    if val < min then
+        Clamp := min;
+    if val > max then
+        Clamp := max
+end;
+
+procedure DrawCell(fieldX, fieldY: integer);
+var
+    i: integer;
+begin
+    GotoXY(fieldX, fieldY);
+    for i := 1 to CellSize * WidthCoefficient  do
+        write(HamsterSymbol);
+    GotoXY(fieldX, fieldY + 1);
+    for i := 1 to CellSize * WidthCoefficient  do
+        write(HamsterSymbol)
+end;
+
+procedure DrawHamster(var hamster: character);
+var
+    fieldX, fieldY: integer;
+begin
+    hamster.curX := Clamp(hamster.curX, 1, GameFieldW + 1);
+    hamster.curY := Clamp(hamster.curY, 1, GameFieldH);
+    fieldX := 1 + (hamster.curX - 1) * CellSize * WidthCoefficient;
+    fieldY := InterfaceBarH + (hamster.curY - 1) * CellSize;
+    DrawCell(fieldX, fieldY)
+end;
+
+procedure UpdateDelta(keyCode: integer; var hamster: character);
+begin
+    case keyCode of
+        ArrowLeftOrd:
+        begin
+            hamster.dX := -1;
+            hamster.dY := 0
+        end;
+        ArrowRightOrd:
+        begin
+            hamster.dX := 1;
+            hamster.dY := 0
+        end;
+        ArrowUpOrd:
+        begin
+            hamster.dX := 0;
+            hamster.dY := -1
+        end;
+        ArrowDownOrd:
+        begin
+            hamster.dX := 0;
+            hamster.dY := 1
+        end
+    end
+end;
+
+{
+procedure ShowHamster(var hamster: character);
+begin
+    GotoXY()
+end;
+}
 
 var
-    code: integer;
+    keyCode: integer;
+    hamster: character;
 begin
-
-    if not IsScreenValid then
+    if not IsTerminalValid then
     begin
-        PrintScreenHelp;
+        PrintTerminalHelp;
         exit
     end;
-    DrawField(1, 1, FieldSize);
+    hamster.curX := 1;
+    hamster.curY := 1;
+    DrawArena(ScreenW, FieldHeight);
     while true do
     begin
         delay(DelaySizeMs);
         if keypressed then
         begin
-            GetKey(code);
-            writeln(code);
-            if (code = EscCode) or (code = CtrlCCode) then
+            GetKey(keyCode);
+            { writeln(keyCode); }
+            if (keyCode = ArrowLeftOrd) or (keyCode = ArrowRightOrd) or
+                (keyCode = ArrowUpOrd) or (keyCode = ArrowDownOrd) then
+            begin
+                UpdateDelta(keyCode, hamster)
+            end;
+            if (keyCode = EscCode) or (keyCode = CtrlCCode) then
                 break
-        end
+        end;
+        DrawHamster(hamster);
+        {
+        if (hamster.curX <> 1) and (hamster.curY <> GameFieldW) and
+            (hamster.curY <> 1) and (hamster.curY <> GameFieldH) then
+        begin
+            DrawHamster(hamster)
+        end;
+        }
+        hamster.curX := hamster.curX + hamster.dX;
+        hamster.curY := hamster.curY + hamster.dY
     end
 end.