- Ve duong Bezier bang thuat toan Casteljau cho ba diem */
#include <conio.h>
#include <dos.h>
#include <graphics.h>
#include "mouse.inc"
#include <math.h>
#define MAXPOINTS 100
#define SOBUOC 10
struct xycoord {
double xcoord, ycoord;
} pt[MAXPOINTS];
void cast3(p1, p2, p3, buoc)
struct xycoord p1, p2, p3;
int buoc;
{
struct xycoord xm1, xm2, xm;
xm1.xcoord = (p1.xcoord + p2.xcoord)/2;
xm1.ycoord = (p1.ycoord + p2.ycoord)/2;
xm2.xcoord = (p2.xcoord + p3.xcoord)/2;
xm2.ycoord = (p2.ycoord + p3.ycoord)/2;
xm.xcoord = (xm1.xcoord + xm2.xcoord)/2;
xm.ycoord = (xm1.ycoord + xm2.ycoord)/2;
putpixel(xm.xcoord, xm.ycoord, GREEN);
if (buoc > 0)
{
cast3(p1, xm1, xm, buoc-1);
cast3(xm, xm2, p3, buoc-1);
}
}
void main()
{
int gr_drive = DETECT, gr_mode, n=3, x, y, i;
unsigned char lbutton = 0, rbutton = 0;
char s[50];
initgraph(&gr_drive, &gr_mode, "");
reset_mouse();
show_mouse();
setcolor(YELLOW);
rectangle(0, 0, getmaxx(), getmaxy());
sprintf(s, "Nhap nut trai chuot de chon toa do %d diem", n);
outtextxy(100, 10, s);
for (i=0; i<n; i++)
{
do {
get_mouse_button(&lbutton, &rbutton, &x, &y);
} while (lbutton == 0 && rbutton == 0);
pt[i].xcoord = x;
pt[i].ycoord = y;
hide_mouse();
circle(x, y, 3);
show_mouse();
while (lbutton || rbutton)
get_mouse_button(&lbutton, &rbutton, &x, &y);
}
setcolor(RED);
hide_mouse();
line(pt[0].xcoord, pt[0].ycoord, pt[1].xcoord, pt[1].ycoord);
line(pt[1].xcoord, pt[1].ycoord, pt[2].xcoord, pt[2].ycoord);
cast3(pt[0], pt[1], pt[2], SOBUOC);
show_mouse();
getch();
closegraph();
}
Tiêu đề: Ve duong Bezier bang thuat toan Casteljau cho ba diem 
10/07/10, 09:58 pm