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CURVEC.C
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#include <stdio.h>
#include<graphics.h>
#include<conio.h>
#include<dos.h>
#include<math.h>
#define RED 14
union REGS in,out;
void initmouse(){
in.x.ax=1;
int86(0x33,&in,&out);
}
int x,y,a[2],x1,y1,x2,y2;
double xt,yt;
void location(){
a[0]=0;
a[1]=0;
while(!kbhit()) {
in.x.ax=3;
int86(0x33,&in,&out);
if(out.x.bx==1){
x=out.x.cx;
y=out.x.dx;
break;
} }
while(!kbhit()){
in.x.ax=3;
int86(0x33,&in,&out);
if(out.x.bx==1){
a[0]=out.x.cx;
a[1]=out.x.dx;
cleardevice();
line(x,y,a[0],a[1]); }
if(out.x.bx==2){
break;
}
} // return a;
}
void blend(){
double t;
while(!kbhit()){
in.x.ax=3;
int86(0x33,&in,&out);
if(out.x.bx==2){
x1=out.x.cx;
y1=out.x.dx;
cleardevice();
line(x1,y1,x2,y2);
putpixel(x1+1,y1,RED);
putpixel(x1,y1+1,RED);
putpixel(x1-1,y1,RED);
putpixel(x1,y1-1,RED);
putpixel(x2+1,y2,RED);
putpixel(x2,y2+1,RED);
putpixel(x2-1,y2,RED);
putpixel(x2,y2-1,RED);
putpixel(x1+2,y1,RED);
putpixel(x1,y1+2,RED);
putpixel(x1-2,y1,RED);
putpixel(x1,y1-2,RED);
putpixel(x2+2,y2,RED);
putpixel(x2,y2+2,RED);
putpixel(x2-2,y2,RED);
putpixel(x2,y2-2,RED);
for( t=0.0;t<1.0;t=t+0.001){
xt=(pow(1-t,3)*x+3*t*pow(1-t,2)*x2+3*pow(1-t,1)*pow(t,2)*x1+pow(t,3)*a[0]);
yt=(pow(1-t,3)*y+3*t*pow(1-t,2)*y2+3*pow(1-t,1)*pow(t,2)*y1+pow(t,3)*a[1]);
putpixel(xt,yt,WHITE);
}
}
if(out.x.bx==1){
x2=out.x.cx;
y2=out.x.dx;
cleardevice();
line(x1,y1,x2,y2);
putpixel(x1+1,y1,RED);
putpixel(x1,y1+1,RED);
putpixel(x1-1,y1,RED);
putpixel(x1,y1-1,RED);
putpixel(x2+1,y2,RED);
putpixel(x2,y2+1,RED);
putpixel(x2-1,y2,RED);
putpixel(x2,y2-1,RED);
putpixel(x1+2,y1,RED);
putpixel(x1,y1+2,RED);
putpixel(x1-2,y1,RED);
putpixel(x1,y1-2,RED);
putpixel(x2+2,y2,RED);
putpixel(x2,y2+2,RED);
putpixel(x2-2,y2,RED);
putpixel(x2,y2-2,RED);
for( t=0.0;t<1.0;t=t+0.001){
xt=(pow(1-t,3)*x+3*t*pow(1-t,2)*x2+3*pow(1-t,1)*pow(t,2)*x1+pow(t,3)*a[0]);
yt=(pow(1-t,3)*y+3*t*pow(1-t,2)*y2+3*pow(1-t,1)*pow(t,2)*y1+pow(t,3)*a[1]);
putpixel(xt,yt,WHITE);
}
}
}
}
void main(){
int gd=DETECT,gm;
a[1]=0;
a[0]=0;
initgraph(&gd,&gm,"c:\\turboc3\\bgi");
// line(10,10,50,100);
initmouse();
location();
// printf("%d , %d",a[0],a[1]);
blend();
getch();
}