90 lines
2.5 KiB
Plaintext
90 lines
2.5 KiB
Plaintext
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MODULE animation; (* moving turtle example *)
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(* demonstrates use of timeout and select() to display a moving turtle in an X11 window *)
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IMPORT SYSTEM, gr;
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CONST
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Side = 8; (* nr of pixels of a square side *)
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VAR base, stride, screenBufSize :INTEGER;
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currentX :INTEGER;
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PROCEDURE drawSquare (x, y, color :INTEGER);
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VAR p, i, j :INTEGER;
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BEGIN
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p := (y*stride + x*4)*Side;
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ASSERT (p + (Side-1)*stride + (Side-1)*4 <= screenBufSize);
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p := base + p;
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FOR j := 0 TO Side-1 DO
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FOR i := 0 TO Side-1 DO SYSTEM.PUT32 (p, color); INC(p, 4) END;
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p := p + stride - Side*4;
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END;
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END drawSquare;
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PROCEDURE putLine (x : INTEGER; y: INTEGER;str : ARRAY OF CHAR);
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VAR z, x1: INTEGER;
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BEGIN
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FOR z := 0 TO LEN(str) - 1 DO
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x1 := (x + z) MOD 100;
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IF str[z] = "b" THEN drawSquare(x1, y, 0600000H); END; (* brown *)
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IF str[z] = "g" THEN drawSquare(x1, y, 000C000H); END; (* green *)
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END;
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END putLine;
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PROCEDURE turtlePicture (x , y : INTEGER);
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BEGIN
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putLine(x, y + 0 , "....bb........");
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putLine(x, y + 1 , "....bbb.......");
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putLine(x, y + 2 , "....bbbb......");
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putLine(x, y + 3 , ".bb..bbb......");
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putLine(x, y + 4 , ".bgggbbbgbbgb.");
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putLine(x, y + 5 , ".ggggggggbbbb.");
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putLine(x, y + 6 , "bggggggggbbbb.");
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putLine(x, y + 7 , ".ggggggg......");
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putLine(x, y + 8 , ".bb..bbb......");
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putLine(x, y + 9 , "....bbbb......");
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putLine(x, y + 10, ".....bbb......");
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putLine(x, y + 11, ".....bb.......")
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END turtlePicture;
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PROCEDURE drawAll;
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BEGIN
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gr.screenBegin;
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gr.clear (0C0F0FFH); (* light blue *)
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turtlePicture (currentX, 15);
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gr.screenEnd;
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END drawAll;
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PROCEDURE run*;
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VAR stop :BOOLEAN;
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ev :gr.EventPars;
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ch :CHAR;
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BEGIN
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base := gr.base; stride := gr.stride;
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gr.createWindow (800, 480);
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screenBufSize := gr.winHeight * stride;
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stop := FALSE; currentX := 15;
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drawAll;
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REPEAT
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gr.nextEvent (400, ev);
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IF ev[0] = gr.EventTimeOut THEN
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drawAll;
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INC (currentX, 4);
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ELSIF ev[0] = gr.EventKeyPressed THEN
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ch := CHR(ev[4]);
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IF (ch = "q") OR (ch = 0AX) OR (ch = " ") THEN stop := TRUE END;
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IF ev[2] = 9 (* ESC *) THEN stop := TRUE END;
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END;
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UNTIL stop;
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gr.finish;
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END run;
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BEGIN
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run;
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END animation.
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