/*
* Performs actions that should happen continuously in the background on this Screen.
*
* Returns: A pointer to the Screen object control should shift to after this function exits, or
* NULL if control should not shift to another Screen object
*/
void GameScreen::doBackground() throw (QUIT, NEW_SCREEN) {
// If we previously retained this and returned, stop saying to retain or we'll leak
if (retain) {
retain = false;
}
applyLayout();
draw();
clock_t curTime = clock();
/*
* If we aren't initialized, initialize. We didn't initialize earlier because we don't want the
* clock to start before we need it to.
*/
if (prevTime <= 0) {
prevTime += curTime;
}
if (curTime > prevTime+tick) {
if (field.canShiftDown(currentTetromino)) {
doShiftDown();
} else if (!doJoinAndRespawn()) {
doGameOver();
}
prevTime = curTime;
}
}
void update_explorer(Explorer& obj)
{
char i, vx, vy;
short wx, wy, ww, wh;
short nvx, nvy;
// Game over if button pressed while dead
if(!obj.active) {
if((B_PRESSED || A_PRESSED) && !quitGame) {
doGameOver();
}
return;
}
// Add health from rolling health
if(rollingHealth > 0) {
rollingHealth -= 10;
obj.health += 10;
if(obj.health > 1000) {
obj.health = 1000;
rollingHealth = 0;
}
}
// Decrease health
if(obj.nextHealthDecrease <= 0) {
obj.nextHealthDecrease = 5;
damage_explorer(obj, 1);
}
obj.nextHealthDecrease--;
// Update animation
if(LEFT_DOWN || RIGHT_DOWN || UP_DOWN || DOWN_DOWN) {
obj.frameTime ++;
if(obj.frameTime > 8) {
obj.frame = !obj.frame;
obj.frameTime = 0;
}
} else {
// If facing left or right, set sprite to standing
if(obj.direction == FACE_LEFT || obj.direction == FACE_RIGHT)
obj.frame = true;
}
// Get horizontal velocity
if(RIGHT_DOWN) {
vx = 1;
obj.direction = FACE_RIGHT;
} else if(LEFT_DOWN) {
vx = -1;
obj.direction = FACE_LEFT;
} else {
vx = 0;
}
// Update horizontal position
obj.x += vx;
obj.x = (obj.x + 8 > gamew) ? gamew - 8 : obj.x;
obj.x = (obj.x < 0) ? 0 : obj.x;
// WALL COLLISION
for(i = 0; i<numWalls; ++i) {
if(!walls[i].active) continue;
wx = walls[i].x*8;
wy = walls[i].y*8;
ww = walls[i].w*8;
wh = walls[i].h*8;
collideSpriteWall(obj.x, obj.y, true, vx, wx, wy, ww, wh);
}
// SPAWNER COLLISION
for(i = 0; i<numSpawners; ++i) {
if(!spawners[i].active) continue;
wx = spawners[i].x*8;
wy = spawners[i].y*8;
collideSpriteSprite(obj.x, obj.y, true, vx, wx, wy);
}
// BADGUY COLLISION
for(i = 0; i<numBadguys; ++i) {
if(!badguys[i].active) continue;
wx = badguys[i].x;
wy = badguys[i].y;
if(collideSpriteSprite(obj.x, obj.y, true, vx, wx, wy))
{
damage_explorer(p1, 1);
}
}
// Get vertical velocity
if(DOWN_DOWN) {
vy = 1;
obj.direction = FACE_DOWN;
} else if(UP_DOWN) {
vy = -1;
obj.direction = FACE_UP;
} else {
vy = 0;
}
// Update vertical position
obj.y += vy;
obj.y = (obj.y + 8 > gameh) ? gameh - 8 : obj.y;
obj.y = (obj.y < 0) ? 0 : obj.y;
// WALL COLLISION
for(i = 0; i<numWalls; ++i) {
if(!walls[i].active) continue;
wx = walls[i].x*8;
wy = walls[i].y*8;
ww = walls[i].w*8;
wh = walls[i].h*8;
collideSpriteWall(obj.x, obj.y, false, vy, wx, wy, ww, wh);
}
// SPAWNER COLLISION
for(i = 0; i<numSpawners; ++i) {
if(!spawners[i].active) continue;
wx = spawners[i].x*8;
wy = spawners[i].y*8;
collideSpriteSprite(obj.x, obj.y, false, vy, wx, wy);
}
// BADGUY COLLISION
for(i = 0; i<numBadguys; ++i) {
if(!badguys[i].active) continue;
wx = badguys[i].x;
wy = badguys[i].y;
if(collideSpriteSprite(obj.x, obj.y, false, vy, wx, wy))
{
damage_explorer(p1, 1);
}
}
// KEY COLLISION
for(i = 0; i<numKeys; ++i) {
if(!keys[i].active) continue;
wx = keys[i].x * 8;
wy = keys[i].y * 8;
if(intersectSpriteSprite(obj.x, obj.y, wx, wy))
{
activate_key(keys[i]);
}
}
// EXIT COLLISION
for(i = 0; i<numExits; ++i) {
if(!exits[i].active) continue;
wx = exits[i].x * 8;
wy = exits[i].y * 8;
if(intersectSpriteSprite(obj.x, obj.y, wx, wy))
{
activate_exit(exits[i]);
}
}
// TREASURE COLLISION
for(i = 0; i<numTreasures; ++i) {
if(!treasures[i].active) continue;
wx = treasures[i].x * 8;
wy = treasures[i].y * 8;
if(intersectSpriteSprite(obj.x, obj.y, wx, wy))
{
activate_treasure(treasures[i]);
}
}
// Player shooting
if(A_PRESSED) {
autoFireTime = 8;
nvx = (obj.direction == FACE_LEFT || LEFT_DOWN) ? -2 : 0;
nvx = (obj.direction == FACE_RIGHT || RIGHT_DOWN) ? 2 : nvx;
nvy = (obj.direction == FACE_UP || UP_DOWN) ? -2 : 0;
nvy = (obj.direction == FACE_DOWN || DOWN_DOWN) ? 2 : nvy;
add_bullet(obj.x+3, obj.y+3, nvx+vx, nvy+vy);
}
// Update Camera
scrollx = 64 - obj.x;
scrolly = 32 - obj.y;
}