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/***************************************************************
* GRAFICOS.C
Ultima version: 19/Mar/00
***************************************************************/
#include
#include
#include
#include
<stdio.h>
<stdlib.h>
<conio.h>
<graphics.h>
int modo_grafico (void)
{
/* Pedimos autodeteccion del driver ... */
int gdriver = DETECT, gmode, errorcode;
/* Inicializa el modo grafico */
initgraph(&gdriver, &gmode, "");
/* Tomamos el resultado de la inicializacion */
errorcode = graphresult();
}
if (errorcode != grOk) { /* Ocurrio un error! */
printf("\n­Error inicializando modo grafico!\n");
printf("Fallo en: %s\n", grapherrormsg(errorcode));
return(1); /* Devolvemos un error */
}
return(0);
void modo_texto(void)
{
closegraph();
}
/***************************************************************
* GRAFICOS.H
Ultima version: 19/Mar/00
***************************************************************/
int modo_grafico (void);
void modo_texto(void);
/***************************************************************
* SPLINES.C
Ultima version: 24/Mar/00
***************************************************************/
#include
#include
#include
#include
#include
<stdio.h>
<stdlib.h>
<conio.h>
<graphics.h>
"graficos.h"
#define MAX_PTOS 10
#define NUM_SEG 20
/* Numero maximo de puntos de control */
/* Cuanto mayor sea, mejor se dibuja */
void dibujaPuntos (int n, double x[], double y[])
{
int i;
for (i=0; i<n; i++) circle ((int) x[i], (int) y[i], 2);
}
6SOLQHV FXUYDV \ VXSHUILFLHV
void SplineCubicaNatural (int n, double x[], double y[])
{
int i, j, m, xp, yp;
double ax[MAX_PTOS], bx[MAX_PTOS], cx[MAX_PTOS], dx[MAX_PTOS];
double ay[MAX_PTOS], by[MAX_PTOS], cy[MAX_PTOS], dy[MAX_PTOS];
double der[MAX_PTOS], gam[MAX_PTOS], ome[MAX_PTOS];
double t, dt;
m = n-1;
/* m es el numero de intervalos que tendremos */
/* Calculamos el valor de gamma (sera el mismo en X y en Y) */
gam[0] = .5;
for (i=1; i<m; i++) gam[i] = 1./(4.-gam[i-1]);
gam[m] = 1./(2.-gam[m-1]);
/* Calculamos el valor de omega para abcisas */
ome[0] = 3.*(x[1]-x[0])*gam[0];
for (i=1; i<m; i++) ome[i] = (3.*(x[i+1]-x[i-1])-ome[i-1])*gam[i];
ome[m] = (3.*(x[m]-x[m-1])-ome[m-1])*gam[m];
/* Valor de la primera derivada en los puntos (eje X) */
der[m]=ome[m];
for (i=m-1; i>=0; i=i-1) der[i] = ome[i]-gam[i]*der[i+1];
/* Sustituimos los valores de gamma, omega y la primera derivada
para calcular los coeficientes a, b, c y d */
for (i=0; i<m; i++) {
ax[i] = x[i];
bx[i] = der[i];
cx[i] = 3.*(x[i+1]-x[i])-2.*der[i]-der[i+1];
dx[i] = 2.*(x[i]-x[i+1])+der[i]+der[i+1];
}
/* Calculamos omega para el eje de ordenadas */
ome[0] = 3.*(y[1]-y[0])*gam[0];
for (i=1; i<m; i++) ome[i] = (3.*(y[i+1]-y[i-1])-ome[i-1])*gam[i];
ome[m] = (3.*(y[m]-y[m-1])-ome[m-1])*gam[m];
/* Hallamos el valor de la primera derivada... */
der[m]=ome[m];
for (i=m-1; i>=0; i=i-1) der[i] = ome[i]-gam[i]*der[i+1];
/* Valor de los coeficientes a, b, c y d en el eje Y */
for (i=0; i<m; i++) {
ay[i] = y[i];
by[i] = der[i];
cy[i] = 3.*(y[i+1]-y[i])-2.*der[i]-der[i+1];
dy[i] = 2.*(y[i]-y[i+1])+der[i]+der[i+1];
}
/* En esta parte, se dibujara la curva por segmentos de lineas
rectas; si NUM_SEG es un valor alto, la grafica se dibujara
con mayor precision. */
}
dt = 1./(double) NUM_SEG;
moveto((int) x[0], (int) y[0]);
for (i=0; i<m; i++) {
for (j=1, t=dt; j<NUM_SEG; j++, t+=dt) {
xp = (int) (ax[i]+bx[i]*t+cx[i]*t*t+dx[i]*t*t*t);
yp = (int) (ay[i]+by[i]*t+cy[i]*t*t+dy[i]*t*t*t);
lineto (xp, yp);
}
}
6SOLQHV FXUYDV \ VXSHUILFLHV
int main (void)
{
double cx[] = {80.5, 120.4, 150.3, 210.0, 352.8, 450.23, 583.33, 564.0};
double cy[] = {20.0, 148.3, 189.32, 275.0, 77.2, 182.81, 315.72, 82.23};
int npuntos = 8, actual =0, tecla;
}
if (modo_grafico() == 0) { /* Inicializacion correcta. */
while (tecla != 's') {
switch (tecla) {
case '+' : actual == npuntos-1 ? actual = 0 : actual++; break;
case '-' : actual == 0 ? actual = npuntos-1 : actual--; break;
case 'h' : cx[actual]+=2; break; /* Derecha precision */
case 'f' : cx[actual]-=2; break; /* Izquierda precision */
case 'g' : cy[actual]+=2; break; /* Abajo precision */
case 't' : cy[actual]-=2; break; /* Arriba precision */
case 'l' : cx[actual]+=5; break; /* Derecha Rapida */
case 'j' : cx[actual]-=5; break; /* Izquierda Rapida */
case 'k' : cy[actual]+=5; break; /* Abajo Rapida */
case 'i' : cy[actual]-=5;
/* Arriba Rapida */
default : ;
}
dibujaPuntos (npuntos, cx, cy);
floodfill( (int) cx[actual], (int) cy[actual], EGA_WHITE);
SplineCubicaNatural(npuntos, cx, cy);
tecla = getch();
cleardevice();
/* Limpiamos la pantalla */
}
modo_texto();
}
return(0);
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