PROGRAM XMPL07 C C Create parameters specifying the maximum sizes of the arrays defining C data, the arrays required for dealing with the list of triangles, and C the arrays of points defining a curve. C PARAMETER (IMAX=41,JMAX=41,KMAX=41,MTRI=200000,NCRA=1001) C C Declare local dimensioned variables to hold data defining a simple C surface and an isosurface. C DIMENSION U(IMAX),V(JMAX),W(KMAX),S(IMAX,JMAX),F(IMAX,JMAX,KMAX) C C Declare a local array to hold the triangle list and a couple of C temporary variables to be used in sorting the list. C DIMENSION RTRI(10,MTRI),RTWK(MTRI,2),ITWK(MTRI) C C Declare variables to hold labels. C CHARACTER*64 UNLB,VNLB,WNLB,UILB,VILB,WILB C C Declare variables to hold the coordinates of points defining a curve. C DIMENSION UCRA(NCRA),VCRA(NCRA),WCRA(NCRA) C C Set the desired minimum and maximum values of U, V, and W. C DATA UMIN,VMIN,WMIN,UMAX,VMAX,WMAX / -1.,-1.,-1.,1.,1.,1. / C C Set the desired values of the dimensions of the data arrays. Note C that IDIM must not exceed IMAX, that JDIM must not exceed JMAX, and C that KDIM must not exceed KMAX. C DATA IDIM,JDIM,KDIM / 31,31,31 / C C Set the desired values of parameters determining the eye position. C ANG1 is a bearing angle, ANG2 is an elevation angle, and RMUL is a C multiplier of the length of the diagonal of the data box, specifying C the distance from the center of the box to the eye. C DATA ANG1,ANG2,RMUL / -35.,25.,2.9 / C C ISTE is a flag that says whether to do a simple image (ISTE=0), C a one-frame stereo image (ISTE=-1), or a two-frame stereo image C (ISTE=+1). C DATA ISTE / 0 / C C ASTE is the desired angle (in degrees) between the lines of sight for C a pair of stereo views. C DATA ASTE / 4. / C C WOSW is the width of the stereo windows to be used in one-frame stereo C images; the width is stated as a fraction of the width of the plotter C frame. (The windows are centered vertically; horizontally, they are C placed as far apart as possible in the plotter frame.) The value used C must be positive and non-zero; it may be slightly greater than .5, if C it is desired that the stereo windows should overlap slightly. C DATA WOSW / .5 / C C Set the desired value of the flag that says whether the basic color C scheme will be white on black (IBOW=0) or black on white (IBOW=1). C DATA IBOW / 1 / C C Set the desired value of the flag that says whether shading of the C surfaces will be done using gray scales (ICLR=0) or colors (ICLR=1). C DATA ICLR / 1 / C C Set the desired values of the shading parameters. Values of SHDE C near 0 give brighter colors and values near 1 give pastel shades. C Values of SHDR near 0 give a narrow range of shades and values near C 1 give a wide range of shades. C DATA SHDE,SHDR / .1 , .8 / C C Set the desired values of the rendering-style indices for the C isosurface and the simple surface, respectively. C DATA IIRS,ISRS / 2,3 / C C Define the conversion constant from degrees to radians. C DATA DTOR / .017453292519943 / C C Define labels for the edges of the box. C DATA UNLB / ' -1 -.8 -.6 -.4 -.2 0 .2 .4 .6 .8 1 ' / DATA VNLB / ' -1 -.8 -.6 -.4 -.2 0 .2 .4 .6 .8 1 ' / DATA WNLB / ' -1 -.8 -.6 -.4 -.2 0 .2 .4 .6 .8 1 ' / C DATA UILB / 'U Coordinate Values' / DATA VILB / 'V Coordinate Values' / DATA WILB / 'W Coordinate Values' / C C Open GKS. C CALL OPNGKS C C Turn clipping off. C CALL GSCLIP (0) C C Double the line width. C CALL GSLWSC (2.) C C Define colors to use. C CALL TDCLRS (1,IBOW,SHDE,SHDR,11,42,5) C C Fill data arrays defining a simple surface and an isosurface. The C simple surface is defined by the equation "w=s(u,v)"; the function C "s" is approximated by the contents of the array S: S(I,J) is the C value of s(U(I),V(J)), where I goes from 1 to IDIM and J from 1 to C JDIM. The isosurface is defined by the equation f(u,v,w)=1.; the C function f is approximated by the contents of the array F: F(I,J,K) C is the value of f(U(I),V(J),W(K)), where I goes from 1 to IDIM, J C from 1 to JDIM, and K from 1 to KDIM. C DO 102 I=1,IDIM U(I)=UMIN+(REAL(I-1)/REAL(IDIM-1))*(UMAX-UMIN) 102 CONTINUE C DO 103 J=1,JDIM V(J)=VMIN+(REAL(J-1)/REAL(JDIM-1))*(VMAX-VMIN) 103 CONTINUE C DO 104 K=1,KDIM W(K)=WMIN+(REAL(K-1)/REAL(KDIM-1))*(WMAX-WMIN) 104 CONTINUE C DO 107 I=1,IDIM DO 106 J=1,JDIM S(I,J)=2.*EXP(-4.*(U(I)**2+V(J)**2))-1. DO 105 K=1,KDIM F(I,J,K)=1.25*U(I)**2+3.0*V(J)**2+5.*W(K)**2 105 CONTINUE 106 CONTINUE 107 CONTINUE C C Select font number 25, turn on the outlining of filled fonts, set the C line width to 1, and turn off the setting of the outline color. C CALL PCSETI ('FN - FONT NUMBER',25) CALL PCSETI ('OF - OUTLINE FLAG',1) CALL PCSETR ('OL - OUTLINE LINE WIDTH',1.) CALL PCSETR ('OC - OUTLINE LINE COLOR',-1.) C C Make TDPACK characters a bit bigger. C CALL TDSETR ('CS1',1.25) C C Define TDPACK rendering styles 1 through 7, using black-and-white C shading or colored shading, whichever is selected. The indices C 1-7 can then be used as arguments in calls to TDITRI, TDSTRI, and C TDMTRI. C IF (ICLR.EQ.0) THEN CALL TDSTRS (1,43,74, 43, 74,-1,-1,1,0.,0.,0.) ! gray/gray CALL TDSTRS (2,43,74, 43, 74,-1,-1,1,0.,0.,0.) ! gray/gray CALL TDSTRS (3,43,74, 43, 74,-1,-1,1,0.,0.,0.) ! gray/gray CALL TDSTRS (4,43,74, 43, 74,-1,-1,1,0.,0.,0.) ! gray/gray CALL TDSTRS (5,43,74, 43, 74,-1,-1,1,0.,0.,0.) ! gray/gray CALL TDSTRS (6,43,74, 43, 74,-1,-1,1,0.,0.,0.) ! gray/gray CALL TDSTRS (7,43,74, 43, 74,-1,-1,1,0.,0.,0.) ! gray/gray ELSE CALL TDSTRS (1,43,74, 43, 74,-1,-1,1,0.,0.,0.) ! gray/gray CALL TDSTRS (2,43,74, 75,106,-1,-1,1,0.,0.,0.) ! gray/red CALL TDSTRS (3,43,74,107,138,-1,-1,1,0.,0.,0.) ! gray/green CALL TDSTRS (4,43,74,139,170,-1,-1,1,0.,0.,0.) ! gray/blue CALL TDSTRS (5,43,74,171,202,-1,-1,1,0.,0.,0.) ! gray/cyan CALL TDSTRS (6,43,74,203,234,-1,-1,1,0.,0.,0.) ! gray/magenta CALL TDSTRS (7,43,74,235,266,-1,-1,1,0.,0.,0.) ! gray/yellow END IF C C Initialize the count of triangles in the triangle list. C NTRI=0 C C Add to the triangle list triangles representing a simple surface. C CALL TDSTRI (U,IDIM,V,JDIM,S,IMAX,RTRI,MTRI,NTRI,ISRS) C IF (NTRI.EQ.MTRI) THEN PRINT * , 'TRIANGLE LIST OVERFLOW IN TDSTRI' STOP END IF C C Add to the triangle list triangles representing an isosurface. C CALL TDITRI (U,IDIM,V,JDIM,W,KDIM,F,IMAX,JMAX,1., + RTRI,MTRI,NTRI,IIRS) C IF (NTRI.EQ.MTRI) THEN PRINT * , 'TRIANGLE LIST OVERFLOW IN TDITRI' STOP END IF C C Add to the triangle list triangles representing a series of marks C along a curve. C DO 108 ICRA=1,NCRA TEMP=REAL(ICRA-1)/REAL(NCRA-1) RADI=(MIN(UMAX-UMIN,VMAX-VMIN)/2.)*(.75+(TEMP-.5)**2) ANGD=720.*TEMP UCRA(ICRA)=(UMIN+UMAX)/2.+RADI*COS(.017453292519943*ANGD) VCRA(ICRA)=(VMIN+VMAX)/2.+RADI*SIN(.017453292519943*ANGD) WCRA(ICRA)=WMIN+TEMP*(WMAX-WMIN) 108 CONTINUE C RMRK=MIN(UMAX-UMIN,VMAX-VMIN,WMAX-WMIN)/50. C CALL TDTTRI (UCRA,VCRA,WCRA,NCRA,5,RMRK,RMRK/8.,RTRI,MTRI,NTRI, + 4,UMIN,VMIN,WMIN,UMAX,VMAX,WMAX) C C Find the midpoint of the data box (to be used as the point looked at). C UMID=.5*(UMIN+UMAX) VMID=.5*(VMIN+VMAX) WMID=.5*(WMIN+WMAX) C C Determine the distance (R) from which the data box will be viewed and, C given that, the eye position. C R=RMUL*SQRT((UMAX-UMIN)**2+(VMAX-VMIN)**2+(WMAX-WMIN)**2) C UEYE=UMID+R*COS(DTOR*ANG1)*COS(DTOR*ANG2) VEYE=VMID+R*SIN(DTOR*ANG1)*COS(DTOR*ANG2) WEYE=WMID+R*SIN(DTOR*ANG2) C C Initialize the stereo offset argument to do either a single view or C a left-eye view (whichever is selected by the value of ISTE). C IF (ISTE.EQ.0) THEN OTEP=0. ! (single view) ELSE OTEP=-R*TAN(DTOR*ASTE/2.) ! (left-eye view) END IF C C Initialize TDPACK. C 109 CALL TDINIT (UEYE,VEYE,WEYE,UMID,VMID,WMID, + UMID,VMID,WMID+R,OTEP) C C If stereo views are being done, do the requested thing, either by C redoing the SET call to put them side by side on the same frame, C or by calling FRAME to put them on separate frames. C IF (OTEP.NE.0.) THEN IF (ISTE.LT.0) THEN CALL GETSET (XVPL,XVPR,YVPB,YVPT,XWDL,XWDR,YWDB,YWDT,LNLG) IF (OTEP.LT.0.) THEN CALL SET (1.-WOSW,1.,.5-.5*WOSW,.5+.5*WOSW, + XWDL,XWDR,YWDB,YWDT,LNLG) ELSE CALL SET ( 0., WOSW,.5-.5*WOSW,.5+.5*WOSW, + XWDL,XWDR,YWDB,YWDT,LNLG) END IF ELSE IF (OTEP.GT.0.) CALL FRAME END IF END IF C C Order the triangles in the triangle list. C CALL TDOTRI (RTRI,MTRI,NTRI,RTWK,ITWK,1) C IF (NTRI.EQ.MTRI) THEN PRINT * , 'TRIANGLE LIST OVERFLOW IN TDOTRI' STOP END IF C C Draw labels for the axes. C CALL TDLBLS (UMIN,VMIN,WMIN,UMAX,VMAX,WMAX, + UNLB,VNLB,WNLB,UILB,VILB,WILB,1) C C Draw the sides of the box that could be hidden. C CALL TDGRDS (UMIN,VMIN,WMIN,UMAX,VMAX,WMAX, + .1*(UMAX-UMIN),.1*(VMAX-VMIN),.1*(WMAX-WMIN), + 12,1) C C Draw the triangles in the triangle list. C CALL TDDTRI (RTRI,MTRI,NTRI,ITWK) C C Draw the sides of the box that could not be hidden. C CALL TDGRDS (UMIN,VMIN,WMIN,UMAX,VMAX,WMAX, + .1*(UMAX-UMIN),.1*(VMAX-VMIN),.1*(WMAX-WMIN), + 12,0) C C If a left-eye view has just been done, loop back for a right-eye view. C IF (OTEP.LT.0.) THEN OTEP=-OTEP GO TO 109 END IF C C Advance the frame. C CALL FRAME C C Close GKS. C CALL CLSGKS C C Done. C STOP C END