#include "conio.h"
#include "graphics.h"
#include "process.h"
#define Ni_circle 0
#define Shun_circle 1
void init_graph();
void draw_base_circle();
void draw_cabu_circle();
void close_graph();
void acrroods();
static float x0,y0;
void line_cabu(), draw_line(),draw_line_cabu();
void line_cabu()
{
int i;
init_graph();
sleep(1);
for(i=0;i<2;i++)
{
line(0,120,300,120); outtextxy(310,120,"Z");
line(100,10,100,300); outtextxy(110,300,"X");
outtextxy(90,130,"O");
draw_line();
if(i==0)
draw_line_cabu(6);
else draw_line_cabu(2);
gotoxy(50,5);
getch();
cleardevice();
setcolor(WHITE);
}
}
void draw_line()
{
line(100,120,600,450);
textcolor(YELLOW);
directvideo=0;
gotoxy(45,5); cprintf("Line from:X0 Y0 Z0 ");
gotoxy(45,6); cprintf("Line to :X500 Y0 Z330");
gotoxy(45,7); cprintf("Units :Pixel");
gotoxy(45,8); cprintf("Line now:");
}
void draw_line_cabu(int step)
{
int Xe=600,Ye=450;
float Fm,Xm=100,Ym=120;
setcolor(RED);
moveto(Xm,Ym);
while(Xm<=Xe&&Ym<=Ye)
{
Fm=(Ym-120)*(Xe-100)-(Xm-100)*(Ye-120);
if(Fm>=0)
Xm=Xm+step;
else
Ym=Ym+step;
lineto(Xm,Ym);
gotoxy(55,8); printf("X%3.0f Y0 Z%3.0f",Xm-100,Ym-120);
delay(1100);
}
}
void init_graph()
{
int gdrive=DETECT,gmode;
initgraph(&gdrive,&gmode,"");
cleardevice();
}
void acrroods()
{
x0=getmaxx()/2;
y0=getmaxy()/2;
}
void draw_base_circle()
{
line(x0-200,y0,x0+200,y0); outtextxy(x0+220,y0,"Z");
line(x0,y0-180,x0,y0+180); outtextxy(x0+10,y0+180,"X");
outtextxy(x0-10,y0+10,"O");
circle(x0,y0,150);
textcolor(YELLOW);
directvideo=0;
gotoxy(46,2);cprintf("Circle start:X0 Y0 Z150");
gotoxy(46,3);cprintf("Circle end :X0 Y0 Z150");
gotoxy(46,4);cprintf("Units :Pixel");
gotoxy(46,5);cprintf("Circle now:");
}
void close_graph()
{
closegraph();
}
void draw_cabu_circle(int sstep,int Directory)
{
int flag=0;
float Fm,Xm,Ym;
Xm=x0+150; Ym=y0;
moveto(Xm,Ym);
setcolor(RED);
while(1)
{
Fm=(Xm-x0)*(Xm-x0)+(Ym-y0)*(Ym-y0)-150*150;
if(Fm>=0){
if(!Directory){
if(Xm>=x0&&Ym<=y0)
{
if(flag) break;
else Xm=Xm-sstep;
}
if(Xm<=x0&&Ym<=y0)
{
flag=1; Ym=Ym+sstep;
}
if(Xm<=x0&&Ym>=y0)
Xm=Xm+sstep;
if(Xm>=x0&&Ym>=y0)
Ym=Ym-sstep;
}
else {
if(Xm>x0&&Ym<y0)
Ym=Ym+sstep;
if(Xm<=x0&&Ym<=y0)
Xm=Xm+sstep;
if(Xm<x0&&Ym>y0) {
flag=1; Ym=Ym-sstep;}
if(Xm>=x0&&Ym>=y0) {
if(flag) break;
Xm=Xm-sstep;}
}
}
else{
if(!Directory) {
if(Xm>x0&&Ym<y0)
{
if(flag) break;
else Ym=Ym-sstep;
}
if(Xm<=x0&&Ym<=y0)
{
flag=1; Xm=Xm-sstep;
}
if(Xm<=x0&&Ym>=y0)
Ym=Ym+sstep;
if(Xm>=x0&&Ym>=y0)
Xm=Xm+sstep;
}
else{
if(Xm>x0&&Ym<y0)
Xm=Xm+sstep;
if(Xm<=x0&&Ym<=y0)
Ym=Ym-sstep;
if(Xm<=x0&&Ym>=y0){
flag=1; Xm=Xm-sstep;}
if(Xm>=x0&&Ym>=y0) {
if(flag) break;
else Ym=Ym+sstep;}
}
}
lineto(Xm,Ym);
gotoxy(58,5); printf("X%3.0f Y0 Z%3.0f ",Ym-y0,Xm-x0);
delay(800);
}
}
void circle_demo(int Directory)
{
int i=0,sstep;
init_graph();
sleep(2);
acrroods(&x0,&y0);
for(i=0;i<2;i++)
{
draw_base_circle(150);
if(i==0){
sstep=6;
draw_cabu_circle(sstep,Directory);}
else{
sstep=1;
draw_cabu_circle(sstep,Directory);}
getch();
cleardevice();
setcolor(WHITE);
}
}
main()
{
int choice=0;
init_graph();
while(choice!=4)
{
setfillstyle(1,RED);
bar(200,30,400,80);
setcolor(GREEN);
settextstyle(3,0,10);
outtextxy(220,50,"DEMO PROGRAM BY P.Y.F");
setcolor(WHITE);
settextstyle(0,0,1);
outtextxy(200,120,"1. Line demo.");
outtextxy(200,140,"2. Shun_Circle demo.");
outtextxy(200,160,"3. Ni_Circle demo.");
outtextxy(200,180,"4. Quit the program.");
outtextxy(160,200,"Please enter your choice:"); gotoxy(46,13);
scanf("%d",&choice);
switch(choice)
{
case 1: line_cabu();break;
case 2: circle_demo(Ni_circle);break;
case 3: circle_demo(Shun_circle);break;
case 4: break;
default: printf("\nChoice wrong,try again!");
}
}
close_graph();
}
