curve bezier

mouse pointer enabled curve drawing

Author: Pratap2018

CURVEC.C

@@ -0,0 +1,161 @@
+#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();
+}