FreeOberon/Programs/TestGraph.Mod

MODULE TestGraph;
IMPORT G := Graph;
VAR c, f: G.Color;
  X, Y, W, H: INTEGER;
  font: G.Font;

PROCEDURE Draw;
BEGIN
  G.ClearToColor(c);
  IF X # -1 THEN
    G.Line(0, 0, X, Y, f);
    G.Line(0, H, X, Y, f);
    G.Line(W, H, X, Y, f);
    G.Line(W, 0, X, Y, f)
  END
END Draw;

PROCEDURE Message;
BEGIN
  IF font # NIL THEN
    G.DrawString('Press space to return. X for down, ESC for up.',
      0, 0, font, f)
  END
END Message;

PROCEDURE Animation;
VAR ch: CHAR;
BEGIN ch := 0X;
  REPEAT
    INC(X); IF X > W THEN X := 0 END;
    Draw;
    Message;
    G.Flip;
    G.Delay(1);
    IF G.KeyPressed() THEN
      ch := G.ReadKey();
      IF ch = 'x' THEN INC(Y, 100)
      ELSIF ch = CHR(27) THEN DEC(Y, 100)
      END
    END
  UNTIL ch = ' ';
END Animation;

PROCEDURE ByKey;
VAR ch: CHAR;
BEGIN
  REPEAT
    INC(X, 50); IF X > W THEN X := 0 END;
    Draw;
    Message;
    G.Flip;
    ch := G.ReadKey();
    IF ch = 'x' THEN INC(Y, 100)
    ELSIF ch = CHR(27) THEN DEC(Y, 100)
    END
  UNTIL ch = ' '
END ByKey;

PROCEDURE Do;
VAR e: G.Event;
  done: BOOLEAN;
BEGIN
  (*G.Settings(320, 200, {});*)
  G.Init;
  G.ShowMouse(FALSE);
  font := G.LoadFont('../Data/Fonts/Main');
  G.GetTargetSize(W, H); DEC(W); DEC(H);
  G.MakeCol(c, 20, 30, 80);
  G.MakeCol(f, 0, 180, 255);
  done := FALSE; X := -1;
  REPEAT
    WHILE G.HasEvents() DO
      G.WaitEvent(e);
      IF e.type = G.quit THEN done := TRUE
      ELSIF e.type = G.mouseMove THEN
        X := e.x; Y := e.y
      ELSIF e.type = G.mouseDown THEN
        IF e.button = 1 THEN Animation
        ELSIF e.button = 2 THEN ByKey
        END
      END
    END;
    Draw;
    G.DrawString('Left mouse button - KeyPressed, right - ReadKey test',
      0, 0, font, f);
    G.Flip;
    G.Delay(1)
  UNTIL done;
  G.Close
END Do;

BEGIN
  Do
END TestGraph.