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C Program to implement Hermite curves for a given set of control points.

Friday, October 2nd, 2009 
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#include<iostream.h>
#include<graphics.h>
#include<conio.h>
#include<stdio.h>
 
struct point
{
int x,y;
};
 
void hermite(point p1,point p4,double r1,double r4)
{
	float x,y,t;
	for(t=0.0;t<=1.0;t+=.001)
	{
		x=(2*t*t*t-3*t*t+1)*p1.x+(-2*t*t*t+3*t*t)*p4.x+(t*t*t-2*t*t+t)*r1+(t*t*t-t*t)*r4;
		y=(2*t*t*t-3*t*t+1)*p1.y+(-2*t*t*t+3*t*t)*p4.y+(t*t*t-2*t*t+1)*r1+(t*t*t-t*t)*r4;
		putpixel(x,y,YELLOW);
	 }
}
 
int main()
{
	int gd=DETECT,gm;
	double r1,r4;
	initgraph(&gd,&gm,"..//BGI");
	point p1,p2;
	printf("Enter 2 hermite points:\n");
	scanf("%d%d%d%d",&p1.x,&p1.y,&p2.x,&p2.y);
	printf("Enter the tangents at p1,p4");
	scanf("%d%d",&r1,&r4);
	cleardevice();
	hermite(p1,p2,r1,r4);
	putpixel(x1,y1,WHITE);
	putpixel(x2,y2,WHITE);
	getch();
	closegraph();
	return 0;
}
Avatar of Ranjith

Author Name :
Ranjith

Total : 2 Comments

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2 Responses to “C Program to implement Hermite curves for a given set of control points.”

  1. gaurav says:
    November 3, 2012 at 7:36 pm

    its not working.

  2. gaurav says:
    November 3, 2012 at 8:36 pm

    #include
    #include
    int line1(int,int,int,int);
    void hermite(int x1,int y1,int x2,int y2,float slope1,float slope2)
    {
    float x,y;
    float u;
    for(u=0.00;u<=1.0;u+=0.001)
    {
    x=(2*u*u*u-3*u*u+1)*x1+(-2*u*u*u+3*u*u)*x2+(u*u*u-2*u*u+u)*slope1*x1+(u*u*u-u*u)*slope2*x2;
    y=(2*u*u*u-3*u*u+1)*y1+(-2*u*u*u+3*u*u)*y2+(u*u*u-2*u*u+u)*slope1*x1+(u*u*u-u*u)*slope2*x2;
    putpixel(20+(int)(x+0.5),240-(int)(y+0.5),RED);
    }
    }

    int main()
    {
    int gd=DETECT,gm;
    initgraph(&gd,&gm,"c:\\tc\\bgi");
    int i,j,k,l,m,n,x,y,z;
    //hermite(10,10,100,100,3,4);
    hermite(100,50,100,100,0.9,-1);
    line1(100,0,100,100);
    line1(100,50,120,0);

    line1(140,0,150,100);
    line1(150,100,160,0);
    line1(145,50,155,50);

    line1(180,0,180,100);
    line1(180,100,200,0);
    line1(200,0,200,100);

    line1(220,0,230,100);
    line1(230,100,240,0);
    line1(225,50,235,50);

    getch();
    closegraph();
    return 0;

    }
    int line1(int x1,int y1,int x2,int y2)
    {
    setcolor(RED);
    line(20+x1,240-y1,20+x2,240-y2);
    return 0;
    }

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