Category : C Source Code
Archive : CADSRC.ZIP
Filename : T-6.C
Output of file : T-6.C contained in archive : CADSRC.ZIP
t-6.c
FUNCTION: Draws cubic parametric curves in 3D.
Compatibility: Supports VGA/EGA/CGA/MCGA graphics adapters and monitors.
NOTE: You need the *.BGI files that come with Turbo-C for
this to run.
___________________________________________________________________
INCLUDE FILES */
#include
#include
#include
#include
#include
/*________________________________________________________________
DECLARATIONS */
float x=0.0,y=0.0,z=0.0;
float sx=0.0,sy=0.0;
float xa=0.0,ya=0.0,za=0.0;
float d=1200.0;
double r1=5.88319;
double r2=6.28319;
double r3=5.79778;
double sr1=0.0,sr2=0.0,sr3=0.0;
double cr1=0.0,cr2=0.0,cr3=0.0;
float mx=0.0,my=0.0,mz=-150.0;
int maxx=639,minx=0,maxy=199,miny=0;
float screen_x=639,screen_y=199;
float rx=0.0,ry=0.0;
int t1=0, h=0;
int C0=0,C1=1,C2=2,C3=3,C4=4,C5=5,C6=6,C7=7,C8=8,C9=9,C10=10,
C11=11,C12=12,C13=13,C14=14,C15=15,mode_flag=0;
int edge_clr=7;
float B11[21][2];
float B12[21][2];
float x1=-30.0,y01=0.0,x4=30.0,y4=0.0,x2=-10.0,y2=15.0,x3=10.0,y3=-35.0;
float j01=0.0,j2=0.0,j3=0.0,j4=0.0;
float t=0.0,t2=0.0,t3=0.0;
float sx1=0.0,sy1=0.0,sx2=0.0,sy2=0.0;
void keyboard(void);void quit_pgm(void);void calc_3d(void);
void rotation(void);void window(void); void graphics_setup(void);
void notice(int x, int y);void freeform(void);
/*___________________________________________________________
MAIN ROUTINE */
main()
{
graphics_setup();
setviewport(minx,miny,maxx,maxy,1);
edge_clr=C7;
setcolor(edge_clr);
rotation();
t=0;t2=t*t;t3=t*t*t;
freeform();z=30.0;calc_3d();window();
moveto(sx,sy);
putpixel(sx,sy,edge_clr);
h=0;
for (t=0;t<=1.01;t+=0.05)
{
t2=t*t;t3=t*t*t;
freeform();z=30.0;calc_3d();window();
lineto(sx,sy);B11[h][0]=sx;B11[h][1]=sy;h=h+1;
}
t=0;t2=t*t;t3=t*t*t;
freeform();z=-30.0;calc_3d();window();
moveto(sx,sy);
putpixel(sx,sy,edge_clr);
h=0;
for (t=0;t<=1.01;t+=0.05)
{
t2=t*t;t3=t*t*t;
freeform();z=-30.0;calc_3d();window();
lineto(sx,sy);B12[h][0]=sx;B12[h][1]=sy;h=h+1;
}
for (h=-20;h<=20;h+=10)
{
t=0;t2=t*t;t3=t*t*t;
freeform();z=h;calc_3d();window();
moveto(sx,sy);putpixel(sx,sy,edge_clr);
for (t=0;t<=1.01;t+=0.05)
{
t2=t*t;t3=t*t*t;
freeform();z=h;calc_3d();window();
lineto(sx,sy);
}
}
for (h=0;h<=20;h+=2)
{
sx1=B11[h][0];sy1=B11[h][1];
sx2=B12[h][0];sy2=B12[h][1];
moveto(sx1,sy1);lineto(sx2,sy2);
}
setcolor(C7);notice(0,0);
for (t1=1;t1!=2; ) keyboard();
quit_pgm();
}
/*_________________________________________________________________
FUNCTION: calculate point on free-form curve
*/
void freeform(void)
{
j01=x1*(-t3+3*t2-3*t+1);j2=x2*(3*t3-6*t2+3*t);j3=x3*(-3*t3+3*t2);
j4=x4*t3;x=j01+j2+j3+j4;
j01=y01*(-t3+3*t2-3*t+1);j2=y2*(3*t3-6*t2+3*t);j3=y3*(-3*t3+3*t2);
j4=y4*t3;y=j01+j2+j3+j4;
return;
}
/*_________________________________________________________________
FUNCTION: calculate SIN,COS factors
*/
void rotation(void)
{
sr1=sin(r1);sr2=sin(r2);sr3=sin(r3);cr1=cos(r1);cr2=cos(r2);
cr3=cos(r3);
return;
}
/*_________________________________________________________________
FUNCTION: standard 3D formulas
*/
void calc_3d(void)
{
x=(-1)*x;xa=cr1*x-sr1*z;za=sr1*x+cr1*z;x=cr2*xa+sr2*y;
ya=cr2*y-sr2*xa;z=cr3*za-sr3*ya;y=sr3*za+cr3*ya;x=x+mx;y=y+my;
z=z+mz;sx=d*x/z;sy=d*y/z;
return;
}
/*_________________________________________________________________
FUNCTION: map cartesian coords to physical screen coords.
*/
void window(void)
{
sx=sx+399;sy=sy+299;rx=screen_x/799;ry=screen_y/599;sx=sx*rx;
sy=sy*ry;
return;
}
/*____________________________________________________________________
SUBROUTINE: press any key to quit... */
void keyboard(void)
{
if (bioskey(1) == 0) return;
else quit_pgm();
}
/*____________________________________________________________________
SUBROUTINE: graceful exit from the program */
void quit_pgm(void)
{
cleardevice(); restorecrtmode();exit(0);
}
/*___________________________________________________________________
SUBROUTINE: vga/ega/cga/mcga compatibility module */
void graphics_setup(void)
{
int graphics_adapter,graphics_mode;
detectgraph(&graphics_adapter,&graphics_mode);
if (graphics_adapter==VGA) goto VGA_mode;
if (graphics_mode==EGAHI) goto EGA_ECD_mode;
if (graphics_mode==EGALO) goto EGA_SCD_mode;
if (graphics_adapter==CGA) goto CGA_mode;
if (graphics_adapter==MCGA) goto CGA_mode;
goto abort_message;
VGA_mode:
graphics_adapter=VGA;graphics_mode=VGAHI;
initgraph(&graphics_adapter,&graphics_mode,"");
maxx=639;minx=0;maxy=479;miny=0;screen_x=639;screen_y=479;
setcolor(7);moveto(0,472);
outtext("640x480 16-color VGA mode");
moveto (472,472);
outtext("Press any key to Quit");
moveto(200,0);
outtext("Using TURBO C to generate 3D curves");
return;
EGA_ECD_mode:
graphics_adapter=EGA;graphics_mode=EGAHI;
initgraph(&graphics_adapter,&graphics_mode,"");
maxx=639;minx=0;maxy=349;miny=0;screen_x=639;screen_y=349;
setcolor(7);moveto(0,342);
outtext("640x350 16-color EGA mode");
moveto (472,342);
outtext("Press any key to Quit");
moveto(200,0);
outtext("Using TURBO C to generate 3D curves");
return;
EGA_SCD_mode:
graphics_adapter=EGA;graphics_mode=EGALO;
initgraph(&graphics_adapter,&graphics_mode,"");
maxx=639;minx=0;maxy=199;miny=0;screen_x=639;screen_y=199;
setcolor(7);moveto(0,192);
outtext("640x200 16-color EGA mode");
moveto (472,192);
outtext("Press any key to Quit");
moveto(200,0);
outtext("Using TURBO C to generate 3D curves");
return;
CGA_mode:
graphics_adapter=CGA;graphics_mode=CGAC3;
initgraph(&graphics_adapter,&graphics_mode,"");
maxx=319;minx=0;maxy=199;miny=0;screen_x=319;screen_y=199;
setcolor(3);moveto(48,192);
outtext("320x200 4-color CGA & MCGA mode");
moveto(120,0);outtext("Using TURBO C ");
return;
abort_message:
printf("\n\nUnable to proceed.\n");
printf("Requires VGA/EGA/CGA/MCGA adapter\n");
printf(" with appropriate monitor.\n");
printf("Please refer to LEE ADAMS book HIGH-Performance CAD Graphics in TURBO C.\n\n");
exit(0);
}
/*__________________________________________________________
SUBROUTINE: copyright notice */
int copyright[][3]={0x7c00,0x0000,0x0000,0x8231,
0x819c,0x645e,0xba4a,0x4252,0x96d0,0xa231,0x8252,0x955e,0xba4a,
0x43d2,0xf442,0x8231,0x825c,0x945e,0x7c00,0x0000,0x0000};
void notice(int x, int y)
{
int a,b,c; int t1=0;
for (t1=0;t1<=6;t1++)
{
a=copyright[t1][0];b=copyright[t1][1];
c=copyright[t1][2];
setlinestyle(USERBIT_LINE,a,NORM_WIDTH);
moveto(x,y);lineto(x+15,y);
setlinestyle(USERBIT_LINE,b,NORM_WIDTH);
moveto(x+16,y);lineto(x+31,y);
setlinestyle(USERBIT_LINE,c,NORM_WIDTH);
moveto(x+32,y);lineto(x+47,y);y=y+1;
}
setlinestyle(USERBIT_LINE,0xFFFF,NORM_WIDTH);
return;
}
/* END */
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