Created
August 19, 2015 22:25
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VT100 Rotozoomer in Cobol
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| IDENTIFICATION DIVISION. | |
| PROGRAM-ID. ROTOZOOM. | |
| DATA DIVISION. | |
| WORKING-STORAGE SECTION. | |
| 01 DUMMY PIC 9(1) BINARY VALUE 0. | |
| 01 FRAME PIC 9(10) VALUE 0. | |
| 01 WS-CNT PIC 9(3) VALUE 0. | |
| 01 WS-CNT2 PIC 9(3) VALUE 0. | |
| 01 TMP PIC 9(3) VALUE 0. | |
| 01 TMP2 PIC 9(1) BINARY VALUE 0. | |
| 01 TMP3 PIC 9(1) BINARY VALUE 0. | |
| 01 TMP4 PIC 9(1) BINARY VALUE 0. | |
| 01 ZOOM PIC 9(3)v9(7) VALUE 0. | |
| 01 DX PIC s9(3)v9(7) VALUE 0. | |
| 01 DY PIC s9(3)v9(7) VALUE 0. | |
| 01 ROT PIC s9(5)v9(7) VALUE 0. | |
| 01 OX PIC s9(5)v9(7) VALUE 0. | |
| 01 OY PIC s9(5)v9(7) VALUE 0. | |
| 01 STARTX PIC s9(5)v9(7) VALUE 0. | |
| 01 STARTY PIC s9(5)v9(7) VALUE 0. | |
| 01 CURX PIC s9(5)v9(7) VALUE 0. | |
| 01 CURY PIC s9(5)v9(7) VALUE 0. | |
| PROCEDURE DIVISION. | |
| INIT. | |
| SET FRAME TO 0. | |
| DISPLAY x"1b" "[2J" WITH NO ADVANCING. | |
| PERFORM WITH TEST AFTER UNTIL DUMMY > 0 | |
| PERFORM RENDERFRAME | |
| END-PERFORM. | |
| RENDERFRAME. | |
| DISPLAY x"1b" "[99A" x"1b" "[99D" WITH NO ADVANCING. | |
| COMPUTE OX = FUNCTION SIN (FRAME / 190) * 20.0 + 1.5 | |
| COMPUTE OY = FUNCTION SIN (FRAME / 180) * 10.0 + 1.6 | |
| COMPUTE ZOOM = FUNCTION SIN (FRAME / 30) + 2.0 | |
| COMPUTE ROT = FRAME / 19 | |
| COMPUTE DX = FUNCTION COS (ROT / 10) * ZOOM | |
| COMPUTE DY = FUNCTION SIN (ROT / 10) * ZOOM | |
| SET WS-CNT TO 0. | |
| SET STARTX TO 0. | |
| SET STARTY TO 0. | |
| PERFORM RENDERROW WITH TEST AFTER UNTIL WS-CNT>=30. | |
| *> DISPLAY x"0a" WITH NO ADVANCING. | |
| *> DISPLAY FRAME | |
| *> DISPLAY ZOOM | |
| ADD 1 TO FRAME. | |
| RENDERROW. | |
| SET WS-CNT2 TO 0. | |
| SET CURX TO STARTX. | |
| SET CURY TO STARTY. | |
| PERFORM RENDERCOLUMN WITH TEST AFTER UNTIL WS-CNT2>=60. | |
| DISPLAY x"0a" WITH NO ADVANCING. | |
| ADD DY TO STARTX. | |
| SUBTRACT DX FROM STARTY. | |
| ADD 1 TO WS-CNT. | |
| RENDERCOLUMN. | |
| COMPUTE TMP2 = FUNCTION MOD (CURX / 20 + OX, 2) | |
| COMPUTE TMP3 = FUNCTION MOD (CURY / 20 + OY, 2) | |
| COMPUTE TMP4 = TMP2 + TMP3 | |
| IF TMP4 > 1 THEN | |
| SET TMP4 TO 0 | |
| END-IF. | |
| IF TMP4 > 0 THEN | |
| DISPLAY x"1b" '[33m#' WITH NO ADVANCING | |
| ELSE | |
| DISPLAY x"1b" '[0m-' WITH NO ADVANCING | |
| END-IF. | |
| ADD DX TO CURX. | |
| ADD DY TO CURY. | |
| ADD 1 TO WS-CNT2. |
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perfect, just what I was looking for!