void
Player::apply_friction()
{
if ((on_ground()) && (fabs(physic.get_velocity_x()) < WALK_SPEED)) {
physic.set_velocity_x(0);
physic.set_acceleration_x(0);
} else if(physic.get_velocity_x() < 0) {
physic.set_acceleration_x(WALK_ACCELERATION_X * 1.5);
} else {
physic.set_acceleration_x(WALK_ACCELERATION_X * -1.5);
}
#if 0
// if we're on ice slow down acceleration or deceleration
if (isice(base.x, base.y + base.height))
{
/* the acceleration/deceleration rate on ice is inversely proportional to
* the current velocity.
*/
// increasing 1 will increase acceleration/deceleration rate
// decreasing 1 will decrease acceleration/deceleration rate
// must stay above zero, though
if (ax != 0) ax *= 1 / fabs(vx);
}
#endif
}
/* distances are multiplied by 2 to avoid decimal numbers.
normal floor: 2
teleports: lynx: 4, ms: 0
force floor: lynx: 1, ms: 0
*/
void dijkstra(int from) {
static int dist2[MAXMAP][MAXMAP];
static char taken[MAXMAP][MAXMAP];
int i,j,n=chips+2,bestx,besty,best,d,x2,y2,cost,d2,slide;
// printf("find distances from %d:\n",from);
for(i=0;i<n;i++) dist[from][i]=(i==from)?0:INF;
for(j=0;j<y;j++) for(i=0;i<x;i++) dist2[i][j]=(id[i][j]==from)?0:INF;
for(j=0;j<y;j++) for(i=0;i<x;i++) taken[i][j]=0;
while(1) {
best=INF,bestx=besty=-1;
for(j=0;j<y;j++) for(i=0;i<x;i++) if(!taken[i][j] && best>dist2[i][j]) best=dist2[i][j],bestx=i,besty=j;
if(bestx<0) break;
taken[bestx][besty]=1;
if(id[bestx][besty]>-1) {
j=id[bestx][besty];
if(dist[from][j]==INF) {
dist[from][j]=dist2[bestx][besty];
// printf(" to %d: %d\n",j,dist2[bestx][besty]);
}
}
if(map[bestx][besty]=='E') continue;
for(d=0;d<4;d++) {
x2=bestx+dx[d]; y2=besty+dy[d]; d2=d;
if(x2<0 || y2<0 || x2>=x || y2>=y || map[x2][y2]=='#') continue;
if(isicecornerwall(x2,y2,d)) continue;
cost=0;
slide=0;
moveloop:
if(x2<0) continue;
if(map[x2][y2]=='T') {
cost+=(ruleset==LYNX)?2:0;
teleportendup(&x2,&y2,d2);
slide=1;
goto moveloop;
} else if(isforcefloor(map[x2][y2])) {
cost+=forcefloorendup(&x2,&y2,&d2);
if(ruleset==MS) cost--;
slide=1;
goto moveloop;
} else if(isice(map[x2][y2])) {
cost+=iceendup(&x2,&y2,&d2);
if(ruleset==MS) cost--;
slide=1;
goto moveloop;
} else if(ruleset==LYNX || (ruleset==MS && !slide)) cost+=2;
if(x2<0) continue;
if(map[x2][y2]=='#') continue;
if(isicecornerwall(x2,y2,d)) continue;
if(dist2[x2][y2]>dist2[bestx][besty]+cost) dist2[x2][y2]=dist2[bestx][besty]+cost;
}
}
if(from<=chips) for(i=0;i<chips+2;i++) if(dist[from][i]==INF) printf("can't go from %d to %d\n",from,i),exit(1);
}
void
Player::handle_horizontal_input()
{
float vx = physic.get_velocity_x();
float vy = physic.get_velocity_y();
float ax = physic.get_acceleration_x();
float ay = physic.get_acceleration_y();
float dirsign = 0;
if(input.left == DOWN && input.right == UP && (!duck || physic.get_velocity_y() != 0)) {
old_dir = dir;
dir = LEFT;
dirsign = -1;
} else if(input.left == UP && input.right == DOWN && (!duck || physic.get_velocity_y() != 0)) {
old_dir = dir;
dir = RIGHT;
dirsign = 1;
}
if (input.fire == UP) {
ax = dirsign * WALK_ACCELERATION_X;
// limit speed
if(vx >= MAX_WALK_XM && dirsign > 0) {
vx = MAX_WALK_XM;
ax = 0;
} else if(vx <= -MAX_WALK_XM && dirsign < 0) {
vx = -MAX_WALK_XM;
ax = 0;
}
} else {
ax = dirsign * RUN_ACCELERATION_X;
// limit speed
if(vx >= MAX_RUN_XM && dirsign > 0) {
vx = MAX_RUN_XM;
ax = 0;
} else if(vx <= -MAX_RUN_XM && dirsign < 0) {
vx = -MAX_RUN_XM;
ax = 0;
}
}
// we can reach WALK_SPEED without any acceleration
if(dirsign != 0 && fabs(vx) < WALK_SPEED) {
vx = dirsign * WALK_SPEED;
}
// changing directions?
if(on_ground() && ((vx < 0 && dirsign >0) || (vx>0 && dirsign<0))) {
if(fabs(vx)>SKID_XM && !skidding_timer.check()) {
skidding_timer.start(SKID_TIME);
play_sound(sounds[SND_SKID], SOUND_CENTER_SPEAKER);
ax *= 2.5;
} else {
ax *= 2;
}
}
// we get slower when not pressing any keys
if(dirsign == 0) {
if(fabs(vx) < WALK_SPEED) {
vx = 0;
ax = 0;
} else if(vx < 0) {
ax = WALK_ACCELERATION_X * 1.5;
} else {
ax = WALK_ACCELERATION_X * -1.5;
}
}
// if we're on ice slow down acceleration or deceleration
if (isice(base.x, base.y + base.height))
{
/* the acceleration/deceleration rate on ice is inversely proportional to
* the current velocity.
*/
// increasing 1 will increase acceleration/deceleration rate
// decreasing 1 will decrease acceleration/deceleration rate
// must stay above zero, though
if (ax != 0) ax *= 1 / fabs(vx);
}
physic.set_velocity(vx, vy);
physic.set_acceleration(ax, ay);
}