//Helper function for recursing procedural cracked screen lines
void DrawCrackedScreenExt(int x0, int y0, int x1, int y1, int remaining) {
//basically, draw this line, then if remaining>0, draw two more lines branching off from it
Color col = RGBColor(255 * (remaining + 6) / 8,255 * (remaining + 6) / 8,255 * (remaining + 6) / 8,0);
DrawLine(x0, y0, x1, y1, col);
if (remaining>0) {
int i, x2, y2;
float angle, distance;
//two lines
for (i=0; i<2; i++) {
if (x0==x1) {
if (y0<y1) {
angle = PI;
} else {
angle= - PI;
}
} else {
//get angle via arctan
angle = qatan((float)(y0-y1)/(float)(x1-x0));
//add or subtract up to a quarter turn depending on first or second line
angle += Random(0, PI/2.0) * (i==0?1.0:-1.0);
if (x0 > x1) {
//correct for quadrant
angle += PI;
}
}
//pick a distance
distance = Random(10,40);
//get new positions
x2 = x1 + distance * qcos(angle);
y2 = y1 - distance * qsin(angle);
//recurse into new set of lines
DrawCrackedScreenExt(x1, y1, x2, y2, remaining-1);
}
}
}
void init_3band_state(EQSTATE* es, int lowfreq, int highfreq, int mixfreq)
{
// Clear state
memset(es,0,sizeof(EQSTATE));
// Set Low/Mid/High gains to unity
es->lg = 1.0;
es->mg = 1.0;
es->hg = 1.0;
// Calculate filter cutoff frequencies
es->lf = qmul(Q2, qsin(qmul(QPI, qdiv(int2q(lowfreq), int2q(mixfreq)))));
es->hf = qmul(Q2, qsin(qmul(QPI, qdiv(int2q(highfreq), int2q(mixfreq)))));
}
//Place the tank somewhere suitable - not too easy, not too close, not too far away, not straight ahead
void PlaceTank(Point3d cameraPosition, Point3d cameraAngle) {
world.objects[tankObjectIndex]=tank;
RotateObjectYAxis(&(world.objects[tankObjectIndex]), Random(-PI/2.0, PI/2.0));
double distance = Random(50.0, 100.0); //At least 50 from us, at most 100
double angle = Random(45.0 / 360.0 * 2 * PI, 315.0 / 360.0 * 2.0 * PI); //45-315 degrees
Point3d tankPos = CreatePoint(cameraPosition.x + distance * qsin(angle + cameraAngle.y), 0, cameraPosition.z + distance * qcos(angle + cameraAngle.y));
MoveObject(&(world.objects[tankObjectIndex]), tankPos);
if (world.objects[tankObjectIndex].centre.z<0) {
//behind us - face away
RotateObjectYAxis(&(world.objects[tankObjectIndex]),PI);
}
}
ft_int16_t qsin(ft_uint16_t a)
{
ft_uint8_t f;
ft_int16_t s0,s1;
if (a & 32768)
return -qsin(a & 32767);
if (a & 16384)
a = 32768 - a;
f = a & 127;
s0 = ft_pgm_read_word(sintab + (a >> 7));
s1 = ft_pgm_read_word(sintab + (a >> 7) + 1);
return (s0 + ((ft_int32_t)f * (s1 - s0) >> 7));
}
//Draw a cracked screen when you've been hit
void DrawCrackedScreen() {
int i, x0, y0, x1, y1;
float angle, distance;
//Pick a centre reasonably close to screen centre
x0 = Random(50, 110);
y0 = Random(40, 80);
//Cycle through 5 angles approximately spread out
for (i=0; i<5; i++) {
//Pick an angle and a distance and recurse some more lines out from there
angle = i * 2.0 * PI / 5 + Random(-0.5, 0.5);
distance = Random(10, 50);
x1 = x0 + distance * qcos(angle);
y1 = y0 - distance * qsin(angle);
//begin recursion, each of these five lines will fork a couple more times
DrawCrackedScreenExt(x0, y0, x1, y1, 2);
}
}
//Draw an explosion in the centre where your shell hit
void DrawExplosion() {
iPoint boom[16];
int i;
double angle, distance;
//Define a poly star with some random peaks
for (i=0; i<16; i++) {
if (i % 2 == 1)
distance = 8;
else
//Random star points to stop all explosions being identical
distance = Random(12.0, 24.0);
angle = PI * 2 * i / 16.0;
boom[i].x = 80.0 - distance * qsin(angle);
boom[i].y = 60 + distance * qcos(angle);
}
DrawPoly(16, boom, YELLOW);
}
/* cos funtion */
ft_int16_t qcos(ft_uint16_t a)
{
return (qsin(a + 16384));
}
//Calculate new angle and position given starting angle and position when timer started, elapsed time and keystate when last changed.
void MoveCamera(Point3d *cameraPos, Point3d *cameraAngle, Point3d baselinePos, float baselineAngle, unsigned int elapsed, int keys) {
float distance;
if(blocked)
SetMotors(0,0);
switch (keys & (KEY_RIGHT_BACK+KEY_RIGHT_FORWARD+KEY_LEFT_BACK+KEY_LEFT_FORWARD)) {
case KEY_RIGHT_BACK+KEY_LEFT_FORWARD: { //rotate right
if (blocked) {
blocked=false;
CloseMotors();
}
cameraAngle->y=baselineAngle + (PI * 2.0 * elapsed) / rotateSleep;
}
break;
case KEY_RIGHT_FORWARD+KEY_LEFT_BACK: { //rotate left
if (blocked) {
blocked=false;
CloseMotors();
}
cameraAngle->y=baselineAngle - (PI * 2.0 * elapsed) / rotateSleep;
}
break;
case KEY_RIGHT_FORWARD: { //one wheel rotate left
if (blocked) {
blocked=false;
CloseMotors();
}
cameraAngle->y=baselineAngle - (PI * elapsed) / rotateSleep;
}
break;
case KEY_LEFT_FORWARD: { //one wheel rotate right
if (blocked) {
blocked=false;
CloseMotors();
}
cameraAngle->y=baselineAngle + (PI * elapsed) / rotateSleep;
}
break;
case KEY_RIGHT_BACK: { //one wheel rotate left
if (blocked) {
blocked=false;
CloseMotors();
}
cameraAngle->y=baselineAngle + (PI * elapsed) / rotateSleep;
}
break;
case KEY_LEFT_BACK: { //one wheel rotate left
if (blocked) {
blocked=false;
CloseMotors();
}
cameraAngle->y=baselineAngle - (PI * elapsed) / rotateSleep;
}
break;
case KEY_RIGHT_FORWARD+KEY_LEFT_FORWARD: { //forward
//First, check if anything is in our way
int ob = LineHitsObject(*cameraPos, *cameraAngle);
if (ob != 0) {
//something's in the way, calculate the distance to it
Point3d offset = SubtractPoint(world.objects[ob].centre, *cameraPos);
distance = qsqrt(offset.x * offset.x + offset.z * offset.z);
//if we're too close, stop engines and refuse to proceed
if (distance < 30 && !blocked) {
if (world.objects[ob].colour.R==255 && world.objects[ob].colour.G==0 && world.objects[ob].colour.B==0) {
//it's a barrel - red barrels always explode in FPSs!
LoseLife("Beware barrels!");
} else {
OpenMotors();
SetMotors(0,0);
PlaySound(SOUND_HIT);
blocked=true;
}
break;
}
}
if (blocked) {
blocked=false;
CloseMotors();
}
distance=(20.0 * elapsed)/FORWARDSLEEP;
cameraPos->x=baselinePos.x + (distance * qsin(baselineAngle));
cameraPos->z=baselinePos.z + (distance * qcos(baselineAngle));
};
break;
case KEY_RIGHT_BACK+KEY_LEFT_BACK: { //backwards
//First, check if anything is in our way
Point3d dir=*cameraAngle;
dir.y=ClipAngle(dir.y+PI);
int ob = LineHitsObject(*cameraPos, dir);
if (ob != 0) {
//something's in the way, calculate the distance to it
Point3d offset = SubtractPoint(world.objects[ob].centre, *cameraPos);
distance = qsqrt(offset.x * offset.x + offset.z * offset.z);
//if we're too close, stop engines and refuse to proceed
if (distance < 30 && !blocked) {
if (world.objects[ob].colour.R==255 && world.objects[ob].colour.G==0 && world.objects[ob].colour.B==0) {
//it's a barrel - red barrels always explode in FPSs!
LoseLife("Beware barrel!s");
} else {
OpenMotors();
SetMotors(0,0);
PlaySound(SOUND_HIT);
blocked=true;
}
break;
}
}
if (blocked) {
blocked=false;
CloseMotors();
}
distance=(20.0 * elapsed)/FORWARDSLEEP;
cameraPos->x=baselinePos.x - (distance * qsin(baselineAngle));
cameraPos->z=baselinePos.z - (distance * qcos(baselineAngle));
};
}
//normalise ret to 0..2PI
cameraAngle->y = ClipAngle(cameraAngle->y);
}
//Handle tank movement
void MoveTank() {
Point3d playerOffset = SubtractPoint(cameraPos, world.objects[tankObjectIndex].centre);
double angleToPlayer;
if (playerOffset.x == 0.0) {
angleToPlayer = ((playerOffset.z < 0.0) ? PI / 2.0 : 0.0);
} else {
angleToPlayer = qatan((double)playerOffset.x / (double)playerOffset.z);
if (playerOffset.x < 0.0)
angleToPlayer += PI;
}
angleToPlayer = ClipAngle(angleToPlayer);
double distanceToPlayer = qsqrt(playerOffset.x * playerOffset.x + playerOffset.z * playerOffset.z);
double angleOffset = ClipAngle(world.objects[tankObjectIndex].heading.y - angleToPlayer);
/*
DrawText(5,35,"X:%d, Z:%d",(int)(playerOffset.x),(int)(playerOffset.z));
DrawText(5,50,"AO:%d, AP:%d",(int)(180.0/PI*angleOffset),(int)(180.0/PI*angleToPlayer));
DrawText(5,65,"DI:%d, Atan:%d",(int)(distanceToPlayer),(int)(1000.0 * qatan((double)playerOffset.x / (double)playerOffset.z)));
*/
switch(behaviourType) {
case 0: { //move forward
MoveObject(&(world.objects[tankObjectIndex]), CreatePoint(2.0 * qsin(world.objects[tankObjectIndex].heading.y), 0.0, 2.0 * qcos(world.objects[tankObjectIndex].heading.y)));
}
break;
case 1: { //rotate right
RotateObjectYAxis(&(world.objects[tankObjectIndex]), 5.0 * PI * 2.0 /360.0);
}
break;
case 2: { //rotate left
RotateObjectYAxis(&(world.objects[tankObjectIndex]), -5.0 * PI * 2.0 /360.0);
}
break;
case 3: { //hunt!
if (angleOffset > PI/4.0 && angleOffset < 7.0 * PI / 4.0) {
//if not pointing roughly at player, turn towards player
RotateObjectYAxis(&(world.objects[tankObjectIndex]), PI / 180.0 * (angleOffset < PI ? -5.0 : 5.0));
} else if (distanceToPlayer > 75.0) {
//if pointing roughly at player but far away, move forward
MoveObject(&(world.objects[tankObjectIndex]), CreatePoint(2.0 * qsin(world.objects[tankObjectIndex].heading.y), 0.0, 2.0 * qcos(world.objects[tankObjectIndex].heading.y)));
} else if (angleOffset < PI / 180.0 * 5.0 || angleOffset > PI / 180.0 * 355.0) {
//turn more finely
RotateObjectYAxis(&(world.objects[tankObjectIndex]), PI / 180.0 * (angleOffset < PI ? -1.0 : 1.0));
} else {
//if pointing roughly at player and close, turn towards player
RotateObjectYAxis(&(world.objects[tankObjectIndex]), PI / 180.0 * (angleOffset < PI ? -5.0 : 5.0));
}
}
}
playerOffset = SubtractPoint(cameraPos, world.objects[tankObjectIndex].centre);
if (playerOffset.x == 0.0) {
angleToPlayer = ((playerOffset.z < 0.0) ? PI / 2.0 : 0.0);
} else {
angleToPlayer = qatan((double)playerOffset.x / (double)playerOffset.z);
if (playerOffset.x < 0.0)
angleToPlayer += PI;
}
angleToPlayer = ClipAngle(angleToPlayer);
distanceToPlayer = qsqrt(playerOffset.x * playerOffset.x + playerOffset.z * playerOffset.z);
angleOffset = ClipAngle(world.objects[tankObjectIndex].heading.y - angleToPlayer);
if (angleOffset < PI / 180.0 * 5.0 || angleOffset > PI / 180.0 * 355.0) {
//if pointing at player, fire
PlaySound(SOUND_SHOOT);
//Hit if close enough angle
if (angleOffset < PI / 180.0 * 2.0 || angleOffset > PI / 180.0 * 358.0) {
LoseLife("You got shot!");
} else {
//Missed - pick a new behaviour
ChooseBehaviour();
}
}
}