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/*
* animate.c - part of the chess demo in the glut distribution.
*
* (C) Henk Kok (kok@wins.uva.nl)
*
* This file can be freely copied, changed, redistributed, etc. as long as
* this copyright notice stays intact.
*/
#include <stdlib.h>
#include <stdio.h>
#include <GL/glut.h>
#include "chess.h"
#define MOVE_FRAC 8
int frac;
int stage;
int piece;
int piece2;
int X, Y, NX, NY, XD, YD;
GLfloat CX1, CY1;
GLfloat CX2, CY2, CZ2;
FILE *inpf = NULL;
extern int path[10][10];
extern int board[10][10];
extern int cycle[10][10], cyclem, cycle2;
extern int stunt[10][10], stuntm, stunt2;
void read_move(void)
{
char buf[256];
if (!inpf)
inpf = fopen("chess.inp", "r");
if (!inpf)
{
fprintf(stderr, "Could not open file chess.inp for reading.\n");
exit(1);
}
if (feof(inpf))
return;
fgets(buf, 200, inpf);
CX1 = NX = X = buf[0]-'a'+1;
CY1 = NY = Y = buf[1]-'0';
CX2 = XD = buf[2]-'a'+1;
CY2 = YD = buf[3]-'0';
piece = board[X][Y];
piece2 = board[XD][YD];
board[X][Y] = 0;
board[XD][YD] = 0;
solve_path(X, Y, XD, YD);
stage = 0;
frac = 0;
cyclem = cycle[X][Y];
cycle2 = cycle[XD][YD];
stuntm = stunt[X][Y];
stunt2 = stunt[XD][YD];
switch(path[X][Y])
{
case NORTH: NY--; break;
case SOUTH: NY++; break;
case WEST: NX--; break;
case EAST: NX++; break;
case NORTHWEST: NX--; NY--; break;
case NORTHEAST: NX++; NY--; break;
case SOUTHWEST: NX--; NY++; break;
case SOUTHEAST: NX++; NY++; break;
}
if (NY == YD && NX == XD)
stage = 1;
}
void proceed(void)
{
frac ++;
if (stage == 1)
{
if (piece2 && frac <= MOVE_FRAC * 2)
{
CZ2 = -((GLfloat) frac)/MOVE_FRAC/1.8;
return;
}
frac = 0;
piece2 = 0;
stage ++;
return;
}
else if (stage == 3)
return;
else
CZ2 = 0.0;
if (frac >= MOVE_FRAC)
{
frac = 0;
X = NX;
Y = NY;
if (NX == XD && NY == YD)
{
board[XD][YD] = piece;
cycle[XD][YD] = cyclem;
stunt[XD][YD] = stuntm;
piece = 0;
read_move();
return;
}
switch(path[X][Y])
{
case NORTH: NY--; break;
case SOUTH: NY++; break;
case WEST: NX--; break;
case EAST: NX++; break;
case NORTHWEST: NX--; NY--; break;
case NORTHEAST: NX++; NY--; break;
case SOUTHWEST: NX--; NY++; break;
case SOUTHEAST: NX++; NY++; break;
}
if (NX == XD && NY == YD)
stage ++;
}
CX1 = ((GLfloat) (X*(MOVE_FRAC-frac) + NX*frac))/ MOVE_FRAC;
CY1 = ((GLfloat) (Y*(MOVE_FRAC-frac) + NY*frac))/ MOVE_FRAC;
}
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