Category : C Source Code
Archive : CADSRC.ZIP
Filename : T-5.C
Output of file : T-5.C contained in archive : CADSRC.ZIP
t-5.c
FUNCTION: Draws a solid 3D Cylinder using plane equation
method of hidden surface removal.
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 x1=0.0,x2=0.0,x3=0.0;
float y01=0.0,y2=0.0,y3=0.0;
float z1=0.0,z2=0.0,z3=0.0;
float sx1=0.0,sx2=0.0,sx3=0.0,sx4=0.0,sx5=0.0;
float sy1=0.0,sy2=0.0,sy3=0.0,sy4=0.0,sy5=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=5.89778;
double r2=6.28319;
double r3=.58539;
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=-350.0;
int maxx=639,minx=0,maxy=199,miny=0;
float screen_x=639,screen_y=199;
float rx=0.0,ry=0.0;
int t=0,t1=0,t2=0, p1=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 key_matte_clr=6, edge_clr=7, solid_clr=0;
float x_res,y_res;
float sp=0.0;
float sp1=0.0,sp2=0.0, sp3=0.0;
int q=0,q1=0,q2=0;
double r4=6.28319,r5=6.28319;
float B11[36][3];
float B12[36][3];
float B21[36][2];
float B22[36][2];
double sr4=0.0,cr4=0.0,sr5=0.0,cr5=0.0;
void keyboard(void);void quit_pgm(void);void calc_3d(void);
void rotation(void);void window(void); void graphics_setup(void);
void coords(void); void draw_poly(void); void notice(int x, int y);
void visibility_test(void);
void cyl_coords(void); void draw_surface(void);
/*___________________________________________________________
MAIN ROUTINE */
main()
{
graphics_setup();
setviewport(0,0,maxx,maxy,1);
key_matte_clr=C6;
edge_clr=C7;solid_clr=C0;
rotation();
r4=0;r5=0;
for (t=0;t<=35;t++)
{
x=30;cyl_coords();z=z+60;calc_3d(); window();
B11[t][0]=x;B11[t][1]=y;B11[t][2]=z;
B21[t][0]=sx;B21[t][1]=sy;
keyboard();
r5=r5+0.17453;
}
r4=0;r5=0;
for (t=0;t<=35;t++)
{
x=30;cyl_coords();z=z-60;calc_3d(); window();
B12[t][0]=x;B12[t][1]=y;B12[t][2]=z;
B22[t][0]=sx;B22[t][1]=sy;
keyboard();
r5=r5+0.17453;
}
for (q1=0;q1<=35;q1++)
{
q2=q1+1; if (q2>35) q2=0;
draw_surface();
keyboard();
}
x1=B11[0][0];y01=B11[0][1];z1=B11[0][2];
x2=B11[25][0];y2=B11[25][1];z2=B11[25][2];
x3=B11[11][0];y3=B11[11][1];z3=B11[11][2];
visibility_test(); if (sp>0) goto all_done;
setcolor(key_matte_clr);setfillstyle(SOLID_FILL,key_matte_clr);
setlinestyle(USERBIT_LINE,0xffff,NORM_WIDTH);
for (q1=0;q1<=35;q1++)
{
q2=q1+1; if (q2>35) q2=0;
sx1=B21[q1][0];sy1=B21[q1][1];
sx2=B21[q2][0];sy2=B21[q2][1];
moveto(sx1,sy1);lineto(sx2,sy2);
}
x=0.0;y=0.0;z=60.0;calc_3d();window();floodfill(sx,sy,key_matte_clr);
keyboard();
setcolor(edge_clr);
for (q1=0;q1<=35;q1++)
{
q2=q1+1; if (q2>35) q2=0;
sx1=B21[q1][0];sy1=B21[q1][1];
sx2=B21[q2][0];sy2=B21[q2][1];
moveto(sx1,sy1);lineto(sx2,sy2);
}
x=0;y=0;z=60.0;calc_3d();window();
setfillstyle(SOLID_FILL,solid_clr);floodfill(sx,sy,edge_clr);
all_done:
setcolor(C7);notice(0,0);
for (t1=1;t1!=2; ) keyboard();
quit_pgm();
}
/*_________________________________________________________________
FUNCTION: calculate world coordinates for cylinder
*/
void cyl_coords(void)
{
sr4=sin(r4);cr4=cos(r4);sr5=sin(r5);
cr5=cos(r5);x1=sr5*x;y=cr5*x;x=cr4*x1;z=sr4*x1;
return;
}
/*_________________________________________________________________
FUNCTION: draw polygonal surface on cylinder.
*/
void draw_surface(void)
{
x1=B11[q1][0];y01=B11[q1][1];z1=B11[q1][2];
x2=B11[q2][0];y2=B11[q2][1];z2=B11[q2][2];
x3=B12[q2][0];y3=B12[q2][1];z3=B12[q2][2];
visibility_test(); if (sp>0) return;
sx1=B21[q1][0];sy1=B21[q1][1];
sx2=B21[q2][0];sy2=B21[q2][1];
sx3=B22[q2][0];sy3=B22[q2][1];
sx4=B22[q1][0];sy4=B22[q1][1];
x=x1+0.5*(x3-x1);y=y01+0.5*(y3-y01);z=z1+0.5*(z3-z1);
sx=d*x/z;sy=d*y/z;window();sx5=sx;sy5=sy;
draw_poly();
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: hidden surface visibility test
*/
void visibility_test(void)
{
sp1=x1*(y2*z3-y3*z2);sp1=(-1)*sp1;sp2=x2*(y3*z1-y01*z3);
sp3=x3*(y01*z2-y2*z1);sp=sp1-sp2-sp3;
return;
}
/*_____________________________________________________________
SUBROUTINE: draw 4-sided SOLID polygon in 3D space
*/
void draw_poly(void)
{
setlinestyle(USERBIT_LINE,0xffff,NORM_WIDTH);
setcolor(key_matte_clr);moveto(sx1,sy1);
lineto(sx2,sy2);lineto(sx3,sy3);lineto(sx4,sy4);lineto(sx1,sy1);
setfillstyle(SOLID_FILL,key_matte_clr);floodfill(sx5,sy5,key_matte_clr);
setcolor(edge_clr);moveto(sx1,sy1);
lineto(sx2,sy2);lineto(sx3,sy3);lineto(sx4,sy4);lineto(sx1,sy1);
setfillstyle(SOLID_FILL,solid_clr);floodfill(sx5,sy5,edge_clr);
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,"");
x_res=640;y_res=480;mode_flag=1;
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(168,0);
outtext("Using TURBO C to generate a solid 3D cylinder");
return;
EGA_ECD_mode:
graphics_adapter=EGA;graphics_mode=EGAHI;
initgraph(&graphics_adapter,&graphics_mode,"");
x_res=640;y_res=350;mode_flag=2;
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(168,0);
outtext("Using TURBO C to generate a solid 3D cylinder");
return;
EGA_SCD_mode:
graphics_adapter=EGA;graphics_mode=EGALO;
initgraph(&graphics_adapter,&graphics_mode,"");
x_res=640;y_res=200;mode_flag=3;
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(168,0);
outtext("Using TURBO C to generate a solid 3D cylinder");
return;
CGA_mode:
graphics_adapter=CGA;graphics_mode=CGAC3;
initgraph(&graphics_adapter,&graphics_mode,"");
x_res=320;y_res=200;C7=3;mode_flag=4;
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(88,0);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: map 640x480 template to 2D screen */
void coords(void)
{
sx=sx*(x_res/640);sy=sy*(y_res/480);return;
}
/*__________________________________________________________
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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