Systems Reference Library IBM 1130/1800 Plotter Subroutines

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Y number s of inches per user's unit to be used along the i Y axis. Xs specifies 0 a the X value of the present position of the pen ir relat iv e to the desired origin, meas ured in the user's s units. e a Y specifies sl o the Y value of the present position of the pen ici relat iv e to the desired origin, meas ured in the go s user's units. n a e s ASSEMBLER d ti rag Standard e n precision: at e CALL S C A L F l od DC A c r DC ov e DC n a DC sr l tic Extended precision: a o nb n CALL S C A L E t ls DC A oe tDC r ta DC vh nDC a t A, rt oB , C, and D are the addresses of constants or idr variables whose values correspond to X ae v sand Y bf a , calls. o Y lir s, Fo r the standard precision c alling sequence, e ni , reach e Xconstant or variable designated by A, B , C, tea os and p D must be two words. T h i s is accomplished hs b , ebest c by using the DEC statement. F o r extended tprecision, iat l v eac h constant or variable must be t hree words. e the l T h i s is accomplished best by using the X FL y et C statement. , a h s a d t GRID e s cThe grid subroutine plots a s t raight line parallel rto eit her the X or the Y axis in a positive o r a inegative direc t ion with tick marks at regularly bspaced intervals. T h e tick marks are 0.10 inch elong, wit h one half of the mark on each side of, and d perpendicular to, t he grid line. T h e programmer i n t h e 4 F O R must specify the starting point, t he direction to be plotted, how f ar to go, and the distance between tick marks. It is not required to know eit her the location of the pen or whether it is up or down when this subroutine is called. A t the end of the subroutine, t he pen is lef t in the up position. — 2 / Starting Point 1 1 FORTRAN Standard precision: Tick Marks CA L L F G R I D (I, X, Y, U, N) Extended precision: CA L L E G R I D (I, X, Y, U, N) I is an integer constant or v ariable that specifies the direc t ion the grid line is to be generated, as follows: I = 0 specifies the +X direction I = 1 specifies the +Y direction I - 2 specifies the - X direction I = 3 specifies the - Y direction Only the last two bits of I are used to det ermine the direction; therefore, us e of larger numbers would repeat the instructions. F o r example, 24 or 4 plot the same as 0 (+X direction). X is a signed real constant or v ariable that specifies the X value of the grid line starting point, measured in the us er's units. Y is a signed real constant or variable that specifies the Y value of the grid line starting point, measured in the user's units. U is a real constant or variable that specifies the distance between tick marks, measured in the user's units. N is an integer constant or v ariable that defines the length of the gr i d line. N is equal to the number of tick marks minus one, and must be less than 32768.
, S t a n d a r d p r e c i s i o n : ASSEMBLER I is an integer expression controlling the pen as follows: CALL DC DC DC DC DC PLOT FORTRAN FGRID A Extended precision: CALL E G R I D DC A DC DC DC DC A, B , C, D, and E are the addresses of constants or v ariables corresponding to I, X, Y, U, and N. respectively, o f the FORTRAN language calls. The constants or variables represented by A and E should be one word each in both standard and extended precision calls. E a c h constant or v ariable represented by B, C, and D mus t be two words f or standard precision and three words f or extended prec is ion. This subroutine is called to move the pen f rom its present position to a new position. I t is the user's res pons ibilit y to check that the coordinates of the new position are wit hin limit s . T h e pen can also be rais ed or lowered before or after the t rav ers e mov ement, as a part of this subroutine. NOTE: I f the pen is up (or down), and a command is giv en to go up (or down), 100 milliseconds of plot t ime are wasted in perf orming the redundancy. Standard precision: CA L L F P L O T (I, X n Extended precision: , Y n ) CA L L E P L O T (I, X n , Y n ) I = Zero I = Pos it iv e I = Negative I = Odd I = Even No change Control pen before movement Control pen af t er movement Raise pen Lower pen Xn is a signed real constant or v ariable defining the X value of the new position, meas ured in the user's units, Y the n Y value of the new position, meas ured in the user's i units, s a ASSEMBLER s i Standard g precision: n CALL F P LOT e DC A d DC r DC e a Extended l precision: c CALL E P LOT o DC A n DC s DC t a nA, B , and C are the addresses of constants or variables t corresponding to I, X n tively, o a n od f the YFORTRAN calls. n r The constant or variable represented by A should , be vonly r eme sword p in e both c -standard and extended precision. a E a c h constant or v ariable represented by rB and C mus t be two words f or standard prec is ion and i three words f or extended precision. a b POI l NT e The d point subroutine draws special point characters at ethe present position of the pen. T h e pen mus t be fdown when this subroutine is called. T h e point characters, i and the points about which they are drawn, n a r e illus t rat ed below. A l l points are at the i intersection of the horizontal and v ert ic al line. n g <strong>Plotter</strong> <strong>Subroutines</strong> 5
Page 1 and 2: Systems Reference Library IBM 1130/
Page 3: I LLUSTRATI ONS CONTENTS INTRODUCTI
Page 6 and 7: Graphs, curves, chart s , et c . ,
Page 10 and 11: This subroutine assumes the pen is
Page 12 and 13: 8 ASSEMBLER Standard precision (exc
Page 14 and 15: APPENDI X B. SUBROUTI NE USAGE 10 S
Page 16 and 17: VARIABLE ALLOCATIONS IA II 1.002E00
Page 18 and 19: JOB / / FOR **PLOTTER TEST 9 *NAME
Page 20 and 21: 16 Figure 7. Plotter Test 5 Drawing
Page 22: I NDEX Annotation subroutine 7 Call
Page 26 and 27: OC26-3755-2 IBM international Busin
Page 28: GC26-3755-2 YOUR COMMENTS, PLEASE T

Systems Reference Library IBM 1130/1800 Plotter Subroutines

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